ABRAXAS PETROLEUM CORP
8-K, 1996-11-27
CRUDE PETROLEUM & NATURAL GAS
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                      SECURITIES AND EXCHANGE COMMISSION


                            Washington, D.C. 20549


                                  F O R M 8-K

                                CURRENT REPORT

                      Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934



                                Date of Report
                               November 27, 1996



                         Abraxas Petroleum Corporation
            (Exact name of registrant as specified in its charter)


                                    Nevada
                (State or other jurisdiction of incorporation)


0-19118                                                      74-2584033
(Commission File Number)          (I.R.S. Employer Identification Number)



500 N. Loop 1604 East,  Suite 100
San Antonio, Texas                                                78232
(Address of principal executive offices)


              Registrant's telephone number, including area code:
                                (210) 490-4788




<PAGE>




Item 2.  ACQUISITION OR DISPOSITION OF ASSETS.


      (A) On November 14, 1996,  Canadian Abraxas Petroleum  Limited  ("Canadian
Abraxas"),   a  wholly-owned   subsidiary  of  Abraxas  Petroleum   Corporation,
("Abraxas"),  acquired 100% of the capital stock of CGGS, Canadian Gas Gathering
Systems Inc.  ("CGGS").  CGGS owns  producing oil and gas  properties in western
Canada (the "CGGS  Properties")  and  interests  ranging from 10% to 100% in 197
miles of natural gas gathering  systems and 11 natural gas processing  plants or
compression facilities,  four of which are operated by CGGS (the "CGGS Plants").
The purchase price for the stock was $94.7 million which included  approximately
$11.0  million  for CGGS'  working  capital.  Funding  for the  acquisition  was
provided by proceeds  from  Abraxas' and Canadian  Abraxas'  recent  senior note
offering.  (See item 5). The CGGS  Properties  consist of  154,968  gross  acres
(86,327 net acres) and 120 gross  wells  (68.8 net  wells),  48 of which will be
operated by the Company.  As of September 1, 1996, the CGGS Properties had total
proved reserves of 10,821 MBOE (91.8% natural gas) with aggregate PV-10 of $46.4
million,  86.3% of which is attributable to proved developed reserves.  The CGGS
Plants had aggregate net natural gas processing capacity of 98.3 MMcf per day at
September 1, 1996.


       (B) On November 14, 1996 Abraxas  acquired a 75% partnership  interest in
Portilla  - 1996 L.P.  (the  "Partnership")  for  $27.5  million  including  the
repayment of certain  indebtedness.  The Company  previously owned the other 25%
interest in the  Partnership.  The Partnership  owned a 100% working interest in
the Portilla Field, a 100% interest in a natural gas processing plant located at
the  Portilla  Field,  located in the Texas gulf coast  region and a 12% working
interest in the Happy Field, located in the Permian Basin of west Texas. Funding
for the acquisition was provided by proceeds from Abraxas' and Canadian Abraxas'
recent senior note offering.  (See item 5).  Portilla and Happy consist of 1,405
gross acres (1,115 net acres) and 78 gross wells (52 net wells), 61 of which are
operated  by the  Company.  As of June 30,  1996,  Portilla  and Happy had total
proved  reserves of 4,314 MBOE (18.4%  natural gas) with an  aggregate  PV-10 of
$30.2 million, 99.8% of which was attributable to proved developed reserves. The
Portilla Plant had natural gas processing  capacity of  approximately  20.0 MMcf
per day at June 30, 1996.


Item 5.  OTHER EVENTS

A. SENIOR NOTE OFFERING

      SALE OF  NOTES.  On  November  14,  1996,  Abraxas  and  Canadian  Abraxas
consummated  the  offering of $215  million of 11.5%  senior notes due 2004 (the
"Notes").

Interest  on the Notes will accrue  from their date of  original  issuance  (the
"Issue Date") and will be payable semi-annually in arrears on May 1 and November
1 of each year,  commencing on May 1, 1997, at the rate of 11.5% per annum.  The
Notes will be  redeemable,  in whole or in part,  at the  option of Abraxas  and


<PAGE>




Canadian  Abraxas,  on or after November 1, 2000, at the  redemption  prices set
forth below,  plus  accrued and unpaid  interest to the date of  redemption,  if
redeemed  during the 12-month  period  commencing on November 1 of the years set
forth below:


Year                                             Percentage
2000                                             105.75%
2001                                             102.875
2002 and thereafter                              100.00%

In addition,  at any time on or prior to November 1, 1999,  Abraxas and Canadian
Abraxas may, at their option, redeem up to 35% of the aggregate principal amount
of the Notes originally  issued with the net cash proceeds of one or more equity
offerings,  at a  redemption  price equal to 111.5% of the  aggregate  principal
amount of the Notes to be redeemed, plus accrued and unpaid interest to the date
of  redemption;  provided,  however,  that,  after  giving  effect  to any  such
redemption, at least $139.75 million aggregate principal amount of Notes remains
outstanding.

      The Notes are  general  unsecured  obligations  of  Abraxas  and  Canadian
Abraxas and will rank pari passu in right of payment to all  existing and future
unsubordinated  indebtedness  of Abraxas and  Canadian  Abraxas.  The Notes rank
senior in right of payment to all future  subordinated  indebtedness  of Abraxas
and  Canadian  Abraxas.  The Notes are,  however,  effectively  subordinated  to
secured  indebtedness of Abraxas and Canadian Abraxas to the extent of the value
of the assets securing such indebtedness.

      The  Notes are  unconditionally  guaranteed,  jointly  and  severally,  by
certain of Abraxas' and Canadian  Abraxas' future  subsidiaries (the "Subsidiary
Guarantors"). The guarantees are general unsecured obligations of the Subsidiary
Guarantors  and  rank  pari  passu in right  of  payment  to all  unsubordinated
indebtedness of the Subsidiary  Guarantors and senior in right of payment to all
subordinated  indebtedness  of the  Subsidiary  Guarantors.  The  Guarantees are
effectively subordinated to secured indebtedness of the Subsidiary Guarantors to
the extent of the value of the assets securing such indebtedness. As of the date
of this Report, Abraxas,  Canadian Abraxas and the Subsidiary Guarantors have no
secured indebtedness outstanding.

      Upon a Change of  Control  (as  defined  in the  Indenture  governing  the
Notes),  each  holder of the Notes  will have the right to require  Abraxas  and
Canadian  Abraxas to  repurchase  all or a portion of such  holder's  Notes at a
redemption price equal to 101% of the principal amount thereof, plus accrued and
unpaid  interest to the date of  repurchase.  In addition,  Abraxas and Canadian
Abraxas  will be  obligated  to offer  to  repurchase  the  Notes at 100% of the
principal  amount  thereof  plus  accrued  and  unpaid  interest  to the date of
repurchase in the event of certain asset sales.

      USE OF PROCEEDS. The net proceeds to Abraxas and Canadian Abraxas from the
offering  of  the  Notes  were  approximately  $207.0  million  after  deducting
underwriting  discounts and estimated  offering  expenses payable by Abraxas and
Canadian Abraxas.


<PAGE>



Abraxas  and  Canadian  Abraxas  used the net  proceeds to (1) repay all amounts
outstanding  under its credit  agreement  dated  September 30, 1996 with Bankers
Trust  Company  ("BT") and other  lenders in the  amount of $85.0  million,  (2)
acquire the outstanding capital stock of CGGS for $94.7 million, (3) acquire the
Partnership  Interest in Portilla - 1996 L.P. and repay certain indebtedness for
$27.5 million and (4) provide  working  capital for general  corporate  purposes
including future acquisitions and development of producing properties.

      New Credit  Facility.  In connection with the consummation of the offering
of the Notes, Abraxas entered into an Amended and Restated Credit Agreement with
Bankers  Trust  Company  and ING (U.S.)  Capital  Corporation  (the "New  Credit
Facility".  The New  Credit  Facility  provides  for a $40.0  million  revolving
facility  of which  $20.0  million  is  initially  available  and is  secured by
substantially all of the U.S. assets of Abraxas.

B. EQUITY ISSUES

In a November 1995 private equity  placement,  the Company sold 1,330,000 units,
each  consisting  of one share of common  stock and one  contingent  value right
("CVR").  Under the terms of the  placement,  each CVR  holder  had the right to
acquire  additional  shares of common stock at November  17, 1996 under  certain
circumstances  related to the current trading value of the Company's  stock. The
Company had the option to extend the issue date for any additional  shares based
on the stock  price  until  November  1997.  On  November  15,  1996 the Company
notified  the CVR owners that it had  exercised  its option and extended any CVR
related share issue date until November 17, 1997 and  correspondingly the target
value of share price had been increased from $10 to $12.50 per share.


Item 7.  FINANCIAL STATEMENTS AND EXHIBITS.

      (A)   Financial Statements of Business Acquired.

      It is impracticable to provide the required  financial  statements for the
acquisitions  described  above at the time this report is filed.  The  financial
statements will be filed as soon as practicable, but no later than 60 days after
this report must be filed.

      (C)   Exhibits.

      The following exhibits are filed as part of this report:

NUMBER                                          DOCUMENT

4.1                                        Indenture  dated November 14, 1996 by
                                           and    among    Abraxas     Petroleum
                                           Corporation   ("Abraxas"),   Canadian
                                           Abraxas Petroleum Limited  ("Canadian
                                           Abraxas")and  IBJ Schroeder  Bank and
                                           Trust Company.

10.1                                       Purchase Agreement dated November 14,
                                           1996 by and among  Abraxas,  Canadian
                                           Abraxas,  BT Securities  Corporation,
                                           Jefferies  &  Company,  Inc.  and ING
                                           Baring (U.S.) Securities  Corporation
                                           (collectively,      the      "Initial
                                           Purchasers").

10.2                                       Registration  Rights  Agreement dated
                                           November   14,   1996  by  and  among
                                           Abraxas,  Canadian  Abraxas,  and the
                                           Initial Purchasers.

10.3                                       Share Sale  Agreement  dated  October
                                           29,   1996  by  and  among   Abraxas,
                                           Canadian  Abraxas,  CGGS Canadian Gas
                                           Gathering  Systems Inc.  ("CGGS") and
                                           the shareholders of CGGS.


10.4                                       Purchase  and  Sale  Agreement  dated
                                           September   18,  1996  by  and  among
                                           Abraxas, ACCO, LLC, Massachusetts Bay
                                           Transportation  Authority  Retirement
                                           Fund,   Metropolitan  Life  Insurance
                                           Company Separate Account No. 175, The
                                           General  Mills  Inc.   Master  Trust:
                                           Pooled  Real  Estate  Fund and  State
                                           Street Research Energy, Inc.

10.5                                       Amended and Restated Credit Agreement
                                           dated  November 14, 1996 by and among
                                           Abraxas,  Bankers Trust Company,  ING
                                           (U.S.)  Capital  Corporation  and the
                                           lenders named therein.











<PAGE>

















                                  SIGNATURES

      Pursuant to the  requirement of the  Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                          ABRAXAS PETROLEUM CORPORATION



                                    By:   /s/ Chris Williford
                                          Chris Williford
                                          Executive Vice President, Chief
                                          Financial Officer and Treasurer



Dated: November 27,  1996














                         ABRAXAS PETROLEUM CORPORATION

                                      and

                      CANADIAN ABRAXAS PETROLEUM LIMITED,

                                  as Issuers

                                      and

                      IBJ SCHRODER BANK & TRUST COMPANY,

                                  as Trustee




                                   INDENTURE

                         Dated as of November 14, 1996




                                 $215,000,000

                      11 1/2% Senior Notes due 2004, Series A

                      11 1/2% Senior Notes due 2004, Series B











<PAGE>




                            CROSS-REFERENCE TABLE

 TIA                                                              Indenture
Section                                                             Section

310(a)(1).............................................................7.10
    (a)(2)............................................................7.10
    (a)(3)..........................................................N.A.
    (a)(4)..........................................................N.A.
    (a)(5)......................................................7.08; 7.10
    (b).........................................................7.08; 7.10,
    .................................................................11.02
    (c).............................................................N.A.
311(a)................................................................7.11
    (b)...............................................................7.11
    (c).............................................................N.A.
312(a)................................................................2.05
    (b)..............................................................10.03
    (c)..............................................................10.03
313(a)................................................................7.06
    (b)(1)..........................................................N.A.
    (b)(2)............................................................7.06
    (c)........................................................7.06; 10.02
    (d)...............................................................7.06
314(a)..........................................................4.07; 4.08;
    .................................................................10.02
    (b).............................................................N.A.
    (c)(1)...........................................................10.04
    (c)(2)...........................................................10.04
    (c)(3)..........................................................N.A.
    (d).............................................................N.A.
    (e)..............................................................10.05
    (f).............................................................N.A.
315(a)...........................................................7.01(b)
    (b)........................................................7.05; 10.02
    (c)..........................................................7.01(a)
    (d)..........................................................7.01(c)
    (e)...............................................................6.11
316(a)(last sentence).................................................2.09
    (a)(1)(A).........................................................6.05
    (a)(1)(B).........................................................6.04
    (a)(2)..........................................................N.A.
    (b)...............................................................6.07
    (c)...............................................................9.04
317(a)(1).............................................................6.08
    (a)(2)............................................................6.09
    (b)...............................................................2.04
318(a)...............................................................10.01
    (c)..............................................................10.01
- ----------------------

N.A. means Not Applicable

NOTE: This  Cross-Reference  Table shall not, for any purpose, be deemed to be a
part of the Indenture.





<PAGE>




                               TABLE OF CONTENTS


                                                                          Page

                                  ARTICLE ONE

                  DEFINITIONS AND INCORPORATION BY REFERENCE

Section 1.01      Definitions.............................................   1
Section 1.02      Incorporation by Reference of TIA.......................  30
Section 1.03      Rules of Construction...................................  31

                                  ARTICLE TWO

                                   THE NOTES

Section 2.01      Form and Dating.........................................  31
Section 2.02      Execution and Authentication; Aggregate
                     Principal Amount.....................................  32
Section 2.03      Registrar and Paying Agent..............................  34
Section 2.04      Paying Agent To Hold Assets in Trust....................  34
Section 2.05      Holder Lists............................................  35
Section 2.06      Transfer and Exchange...................................  35
Section 2.07      Replacement Notes.......................................  36
Section 2.08      Outstanding Notes.......................................  36
Section 2.09      Treasury Notes..........................................  37
Section 2.10      Temporary Notes.........................................  37
Section 2.11      Cancellation............................................  37
Section 2.12      Defaulted Interest......................................  38
Section 2.13      CUSIP Number............................................  39
Section 2.14      Deposit of Monies.......................................  39
Section 2.15      Restrictive Legends.....................................  39
Section 2.16      Book-Entry Provisions for Global Security...............  41
Section 2.17      Special Transfer Provisions.............................  43
Section 2.18      Liquidated Damages Under Registration
                     Rights Agreement.....................................  45

                                 ARTICLE THREE

                                  REDEMPTION

Section 3.01      Notices to Trustee......................................  46
Section 3.02      Selection of Notes To Be Redeemed.......................  46
Section 3.03      Optional Redemption.....................................  47
Section 3.04      Notice of Redemption....................................  47

                                     i
145385.01


<PAGE>




Section 3.05      Effect of Notice of Redemption..........................  48
Section 3.06      Deposit of Redemption Price.............................  49
Section 3.07      Notes Redeemed in Part..................................  49

                                     ii
145385.01


<PAGE>





                                 ARTICLE FOUR

                                   COVENANTS

Section 4.01      Payment of Notes........................................  49
Section 4.02      Maintenance of Office or Agency.........................  50
Section 4.03      Corporate Existence.....................................  50
Section 4.04      Payment of Taxes and Other Claims.......................  50
Section 4.05      Maintenance of Properties and
                     Insurance............................................  51
Section 4.06      Compliance Certificate; Notice of
                     Default..............................................  51
Section 4.07      Compliance with Laws....................................  52
Section 4.08      Reports to Holders......................................  53
Section 4.09      Waiver of Stay, Extension or Usury Laws.................  53
Section 4.10      Limitation on Restricted Payments.......................  53
Section 4.11      Limitation on Transactions with
                     Affiliates...........................................  56
Section 4.12      Limitation on Incurrence of Additional
                     Indebtedness.........................................  57
Section 4.13      Limitation on Dividend and Other Payment
                     Restrictions Affecting Restricted
                     Subsidiaries.........................................  59
Section 4.14      Limitation on Restricted and
                     Unrestricted Subsidiaries............................  60
Section 4.15      Change of Control.......................................  61
Section 4.16      Limitation on Asset Sales...............................  64
Section 4.17      Limitation on Preferred Stock of
                     Restricted Subsidiaries..............................  68
Section 4.18      Limitation on Liens.....................................  68
Section 4.19      Limitation on Conduct of Business.......................  68
Section 4.20      Additional Subsidiary Guarantees........................  68

                                 ARTICLE FIVE

                             SUCCESSOR CORPORATION

Section 5.01      Merger, Consolidation and Sale of Assets................  69
Section 5.02      Successor Corporation Substituted.......................  71


                                     iii
145385.01


<PAGE>




                                 ARTICLE SIX

                                   REMEDIES

Section 6.01      Events of Default.......................................  71
Section 6.02      Acceleration............................................  73
Section 6.03      Other Remedies..........................................  74
Section 6.04      Waiver of Past Defaults.................................  74
Section 6.05      Control by Majority.....................................  75
Section 6.06      Limitation on Suits.....................................  75
Section 6.07      Right of Holders To Receive Payment.....................  76
Section 6.08      Collection Suit by Trustee..............................  76
Section 6.09      Trustee May File Proofs of Claim........................  76
Section 6.10      Priorities..............................................  77
Section 6.11      Undertaking for Costs...................................  77
Section 6.12      Restoration of Rights and Remedies......................  78

                                 ARTICLE SEVEN

                                    TRUSTEE

Section 7.01      Duties of Trustee.......................................  78
Section 7.02      Rights of Trustee.......................................  79
Section 7.03      Individual Rights of Trustee............................  81
Section 7.04      Trustee's Disclaimer....................................  81
Section 7.05      Notice of Default.......................................  81
Section 7.06      Reports by Trustee to Holders...........................  81
Section 7.07      Compensation and Indemnity..............................  82
Section 7.08      Replacement of Trustee..................................  83
Section 7.09      Successor Trustee by Merger, Etc........................  84
Section 7.10      Eligibility; Disqualification...........................  84
Section 7.11      Preferential Collection of Claims
                     Against Issuers......................................  85

                                 ARTICLE EIGHT

                      DISCHARGE OF INDENTURE; DEFEASANCE

Section 8.01      Termination of Issuers' Obligations.....................  85
Section 8.02      Application of Trust Money..............................  88
Section 8.03      Repayment to the Issuers................................  88
Section 8.04      Reinstatement...........................................  89
Section 8.05      Acknowledgment of Discharge by Trustee..................  89



                                     iv
145385.01


<PAGE>




                                 ARTICLE NINE

                         MODIFICATION OF THE INDENTURE

Section 9.01      Without Consent of Holders..............................  89
Section 9.02      With Consent of Holders.................................  90
Section 9.03      Compliance with TIA.....................................  90
Section 9.04      Revocation and Effect of Consents.......................  91
Section 9.05      Notation on or Exchange of Notes........................  92
Section 9.06      Trustee To Sign Amendments, Etc.........................  92

                                  ARTICLE TEN

                                 MISCELLANEOUS

Section 10.01     TIA Controls............................................  92
Section 10.02     Notices.................................................  93
Section 10.03     Communications by Holders with Other
                     Holders..............................................  94
Section 10.04     Certificate and Opinion as to Conditions
                     Precedent............................................  94
Section 10.05     Statements Required in Certificate or
                     Opinion..............................................  94
Section 10.06     Rules by Trustee, Paying Agent, Registrar...............  95
Section 10.07     Legal Holidays..........................................  95
Section 10.08     Governing Law...........................................  95
Section 10.09     No Adverse Interpretation of Other
                     Agreements...........................................  95
Section 10.10     No Personal Liability...................................  96
Section 10.11     Successors..............................................  96
Section 10.12     Duplicate Originals.....................................  96
Section 10.13     Severability............................................  96
Section 10.14     Independence of Covenants...............................  96

                                ARTICLE ELEVEN

                              GUARANTEE OF NOTES

Section 11.01     Unconditional Guarantee.................................  97
Section 11.02     Limitations on Guarantees...............................  98
Section 11.03     Execution and Delivery of Guarantee.....................  99
Section 11.04     Release of a Subsidiary Guarantor.......................  99
Section 11.05     Waiver of Subrogation................................... 100
Section 11.06     Immediate Payment....................................... 101
Section 11.07     No Set-Off.............................................. 101
Section 11.08     Obligations Absolute.................................... 101

                                     v
145385.01


<PAGE>




Section 11.09     Obligations Continuing.................................. 102
Section 11.10     Obligations Not Reduced................................. 102
Section 11.11     Obligations Reinstated.................................. 102
Section 11.12     Obligations Not Affected................................ 103

                                     vi
145385.01


<PAGE>




Section 11.13     Waiver.................................................. 104
Section 11.14     No Obligation To Take Action Against
                     the Issuers.......................................... 104
Section 11.15     Dealing with the Issuers and Others..................... 105
Section 11.16     Default and Enforcement................................. 105
Section 11.17     Amendment, Etc.......................................... 105
Section 11.18     Acknowledgment.......................................... 106
Section 11.19     Costs and Expenses...................................... 106
Section 11.20     No Merger or Waiver; Cumulative Remedies................ 106
Section 11.21     Survival of Obligations................................. 106
Section 11.22     Guarantee in Addition to Other
                     Obligations.......................................... 107
Section 11.23     Severability............................................ 107
Section 11.24     Successors and Assigns.................................. 107

Signatures           ..................................................... 108


Exhibit A - Form of Initial Note.......................................... A-1
Exhibit B - Form of Exchange Note......................................... B-1
Exhibit C - Form of Certificate To Be Delivered
                  in Connection with Transfers to
                  Non-QIB Accredited Investors............................ C-1
Exhibit D - Form of Certificate To Be Delivered in
                  Connection with Transfers Pursuant to
                  Regulation S............................................ D-1
Exhibit E - Guarantee..................................................... E-1


Note: This Table of Contents shall not, for any purpose, be deemed to be part of
the Indenture.


                                     vii
145385.01


<PAGE>





            INDENTURE,  dated as of November 14, 1996,  among Abraxas  Petroleum
Corporation,  a Nevada  corporation (the "Company"),  Canadian Abraxas Petroleum
Limited,  a Canadian  corporation  and wholly  owned  subsidiary  of the Company
("Canadian  Abraxas" and,  together  with the Company,  the  "Issuers")  and IBJ
Schroder  Bank  &  Trust  Company,  a New  York  corporation,  as  Trustee  (the
"Trustee").

            The Issuers have duly authorized the creation of an issue of 11 1/2%
Senior Notes due 2004,  Series A (the "Initial  Notes") and 11 1/2% Senior Notes
due 2004,  Series B to be issued in exchange for the Initial  Notes  pursuant to
the Registration Rights Agreement (as defined herein) (the "Exchange Notes" and,
together  with the Private  Exchange  Notes (as defined  herein) and the Initial
Notes, the "Notes") and, to provide  therefor,  the Issuers have duly authorized
the execution and delivery of this Indenture.  The Notes will be guaranteed on a
senior basis by each of the Company's future Restricted Subsidiaries (as defined
herein)  (collectively,  the "Subsidiary  Guarantors").  All things necessary to
make the Notes, when duly issued and executed by the Issuers,  and authenticated
and delivered hereunder,  the valid obligations of the Issuers, and to make this
Indenture a valid and binding agreement of the Issuers, have been done.

            Each party  hereto  agrees as follows  for the  benefit of the other
parties and for the equal and ratable benefit of the Holders of the Notes.


                                  ARTICLE ONE

                  DEFINITIONS AND INCORPORATION BY REFERENCE


            SECTION 1.01      Definitions.

            "Acquired Indebtedness" means Indebtedness of a Person or any of its
Subsidiaries  (i)  existing  at  the  time  such  Person  becomes  a  Restricted
Subsidiary or at the time it merges or  consolidates  with the Company or any of
its Restricted Subsidiaries or (ii) which becomes Indebtedness of the Company or
a Restricted  Subsidiary in connection  with the acquisition of assets from such
Person,  in each case not incurred in  connection  with, or in  anticipation  or
contemplation  of,  such  Person  becoming  a  Restricted   Subsidiary  or  such
acquisition, merger or consolidation.

            "Additional  Interest"  shall  have  the  meaning  set  forth in the
Registration Rights Agreement.

            "Adjusted   Consolidated   Net  Tangible   Assets"  means   (without
duplication),  as of the date of  determination,  (a) the sum of (i)  discounted
future net  revenues  from  proved oil and gas  reserves  of the Company and its
consolidated  Subsidiaries,  calculated in accordance with Commission guidelines
(before  any  state  or  federal  income  tax),  as  estimated  by a  nationally
recognized firm of independent petroleum engineers as of a date

                                     1
145385.01


<PAGE>




no earlier than the date of the Company's latest annual  consolidated  financial
statements,  as increased  by, as of the date of  determination,  the  estimated
discounted  future net revenues from (A)  estimated  proved oil and gas reserves
acquired since the date of such year-end  reserve report,  and (B) estimated oil
and gas reserves attributable to upward revisions of estimates of proved oil and
gas reserves since the date of such year-end  reserve report due to exploration,
development or  exploitation  activities,  in each case calculated in accordance
with  Commission  guidelines  (utilizing  the prices  utilized in such  year-end
reserve  report),  and  decreased  by,  as of the  date  of  determination,  the
estimated  discounted  future net revenues from (C) estimated proved oil and gas
reserves  produced or disposed of since the date of such year-end reserve report
and (D) estimated  oil and gas reserves  attributable  to downward  revisions of
estimates of proved oil and gas reserves since the date of such year-end reserve
report due to changes in geological  conditions or other factors which would, in
accordance with standard industry practice,  cause such revisions,  in each case
calculated  in  accordance  with  Commission  guidelines  (utilizing  the prices
utilized in such year-end reserve report); provided,  however, that, in the case
of each of the  determinations  made  pursuant to clauses (A) through (D),  such
increases  and  decreases  shall  be as  estimated  by the  Company's  petroleum
engineers,  unless in the event that  there is a Material  Change as a result of
such  acquisitions,  dispositions or revisions,  then the discounted  future net
revenues  utilized  for  purposes of this clause  (a)(i)  shall be  confirmed in
writing,  by a nationally  recognized  firm of independent  petroleum  engineers
(which may be the  Company's  independent  petroleum  engineers  who prepare the
Company's  annual  reserve  report)  plus (ii) the  capitalized  costs  that are
attributable  to oil and gas properties of the Company and its  Subsidiaries  to
which no proved oil and gas reserves are  attributable,  based on the  Company's
books and records as of a date no earlier than the date of the Company's  latest
annual or quarterly financial statements,  plus (iii) the Net Working Capital on
a date no earlier than the date of the Company's latest  consolidated  annual or
quarterly  financial  statements  plus (iv) with respect to each other  tangible
asset of the Company or its consolidated Restricted  Subsidiaries,  specifically
including, but not to the exclusion of any other qualifying tangible assets, the
Company's or its consolidated Restricted Subsidiaries,  gas producing facilities
and unproved oil and gas properties  (less any remaining  deferred  income taxes
which have been allocated to such gas processing  facilities in connection  with
the acquisition thereof), land, equipment,  leasehold improvements,  investments
carried  on the  equity  method,  restricted  cash  and the  carrying  value  of
marketable  securities,  the  greater  of (A) the net book  value of such  other
tangible  asset  on a date no  earlier  than the  date of the  Company's  latest
consolidated  annual or  quarterly  financial  statements  or (B) the  appraised
value, as estimated by a qualified  Independent  Advisor, of such other tangible
assets of the Company and its Restricted  Subsidiaries,  as of a date no earlier
than the date of the Company's  latest audited  financial  statements  minus (b)
minority  interests  and,  to the extent  not  otherwise  taken into  account in
determining  Adjusted  Consolidated  Net  Tangible  Assets,  any  gas  balancing
liabilities  of  the  Company  and  its  consolidated   Restricted  Subsidiaries
reflected in the Company's latest audited financial statements.  In addition to,
but without  duplication  of, the  foregoing,  for purposes of this  definition,
"Adjusted  Consolidated  Net Tangible  Assets" shall be calculated  after giving
effect,  on a pro forma  basis,  to (1) any  Investment  not  prohibited  by the
Indenture,  to and including the date of the transaction giving rise to the need
to calculate Adjusted Consolidated Net Tangible Assets (the "Assets Transaction

                                     2
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Date"),  in any other Person  that,  as a result of such  Investment,  becomes a
Restricted Subsidiary of the Company, (2) the acquisition,  to and including the
Assets  Transaction  Date (by  merger,  consolidation  or  purchase  of stock or
assets), of any business or assets,  including,  without  limitation,  Permitted
Industry  Investments,  and  (3) any  sales  or  other  dispositions  of  assets
permitted by the Indenture  (other than sales of  Hydrocarbons  or other mineral
products in the ordinary course of business) occurring on or prior to the Assets
Transaction Date.

            "Affiliate"  means,  with respect to any specified  Person,  (a) any
other  Person who  directly or  indirectly  through  one or more  intermediaries
controls,  or is controlled  by, or under common  control with,  such  specified
Person and (b) any Related Person of such Person.  The term "control"  means the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction  of the  management  and  policies  of a Person,  whether  through the
ownership  of  voting  securities,  by  contract  or  otherwise;  and the  terms
"controlling" and "controlled" have meanings correlative of the foregoing.

            "Affiliate Transaction" has the meaning provided in Section 4.11.

            "Agent" means any Registrar, Paying Agent or co-Registrar.

            "Agent Members" has the meaning provided in Section 2.16.

            "Asset  Acquisition"  means (a) an  Investment by the Company or any
Restricted  Subsidiary  in any other Person  pursuant to which such Person shall
become a Restricted  Subsidiary,  or shall be merged with or into the Company or
any  Restricted  Subsidiary,  or  (b)  the  acquisition  by the  Company  or any
Restricted  Subsidiary  of the assets of any  Person  (other  than a  Restricted
Subsidiary)  which  constitute  all or  substantially  all of the assets of such
Person or comprises any division or line of business of such Person or any other
properties  or  assets  of such  Person  other  than in the  ordinary  course of
business.

            "Asset   Sale"  means  any  direct  or  indirect   sale,   issuance,
conveyance,  transfer, exchange, lease (other than operating leases entered into
in the ordinary  course of business),  assignment or other transfer for value by
the  Company  or any of its  Restricted  Subsidiaries  (including  any  Sale and
Leaseback  Transaction)  to any Person  other than the  Company or a  Restricted
Subsidiary of (a) any Capital  Stock of any  Restricted  Subsidiary;  or (b) any
other property or assets (including any interests therein) of the Company or any
Restricted  Subsidiary,   including  any  disposition  by  means  of  a  merger,
consolidation or similar transaction;  provided, however, that Asset Sales shall
not include (i) the sale,  lease,  conveyance,  disposition or other transfer of
all or substantially  all of the assets of the Company in a transaction which is
made in compliance  with the provisions of Section 5.01,  (ii) any Investment in
an  Unrestricted  Subsidiary  which is made in compliance with the provisions of
Section  4.10,  (iii)  disposals or  replacements  of obsolete  equipment in the
ordinary course of business,  (iv) the sale, lease,  conveyance,  disposition or
other transfer (each, a "Transfer") by the Company or any Restricted  Subsidiary
of assets or property to the Company or one or more Restricted Subsidiaries, (v)
any disposition of Hydrocarbons

                                     3
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or other mineral  products for value in the ordinary course of business and (vi)
the Transfer by the Company or any  Restricted  Subsidiary of assets or property
in the ordinary course of business; provided, however, that the aggregate amount
(valued at the fair market  value of such assets or property at the time of such
Transfer)  of all such  assets  and  property  Transferred  since the Issue Date
pursuant to this clause (vi) shall not exceed $1,000,000 in any one year.

            "Authenticating Agent" has the meaning provided in Section 2.02.

            "Bankruptcy  Law" means Title 11, U.S. Code or any similar  Federal,
state or foreign law for the relief of debtors.

            "Board  of  Directors"  means,  as for  any  Person,  the  board  of
directors of such Person or any duly authorized committee thereof.

            "Board  Resolution"  means,  with respect to any Person, a copy of a
resolution  certified by the Secretary or an Assistant  Secretary of such Person
to be in full force and effect on the date of such certification,  and delivered
to the Trustee.

            "Business  Day" means any day other than a  Saturday,  Sunday or any
other day on which banking  institutions in the City of New York are required or
authorized by law or other governmental action to be closed.

            "Canadian  Abraxas"  means  the  party  named  as such in the  first
paragraph  of this  Indenture  until a  successor  replaces  it pursuant to this
Indenture and thereafter means such successor.

            "Capital  Stock"  means (i) with  respect  to any  Person  that is a
corporation, any and all shares, interests,  participations or other equivalents
(however  designated  and  whether  voting  or  non-voting)  of  capital  stock,
including each class of Common Stock and Preferred  Stock of such Person and any
and all rights,  warrants or options  exchangeable  for or convertible into such
capital stock and (ii) with respect to any Person that is not a corporation, any
and all partnership or other equity interests of such Person.

            "Capitalized   Lease  Obligation"  means,  as  to  any  Person,  the
discounted  present value of the rental obligations of such Person under a lease
of (or other agreement  conveying the right to use) any property  (whether real,
personal  or mixed) that is required to be  classified  and  accounted  for as a
capital lease obligation at such date, determined in accordance with GAAP.

            "Cascade"  means  Cascade  Oil  &  Gas  Ltd.,  an  Alberta,   Canada
corporation.

            "Cash  Equivalents"  means (a) marketable direct  obligations issued
by, or unconditionally  guaranteed by, the United States Government or issued by
any agency thereof and backed by the full faith and credit of the United States,
in each case maturing within one year from the date of acquisition  thereof; (b)
marketable direct obligations issued

                                     4
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<PAGE>




by any state of the United States of America or any political subdivision of any
such state or any public  instrumentality  thereof maturing within one year from
the date of acquisition  thereof and, at the time of acquisition,  having one of
the two highest ratings  obtainable  from either  Standard & Poor's  Corporation
("S&P") or Moody's Investors  Service,  Inc.  ("Moody's");  (c) commercial paper
maturing  no more than one year from the date of  creation  thereof  and, at the
time of  acquisition,  having a rating  of at least A-1 from S&P or at least P-1
from  Moody's;  (d)  certificates  of deposit or bankers'  acceptances  maturing
within  one  year  from  the  date of  acquisition  thereof  issued  by any bank
organized under the laws of the United States of America or any state thereof or
the District of Columbia or any United States branch of a foreign bank having at
the date of acquisition  thereof  combined  capital and surplus of not less than
$250,000,000; (e) repurchase obligations with a term of not more than seven days
for underlying  securities of the types  described in clause (a) above;  and (f)
money market mutual or similar funds having assets in excess of $100,000,000.

            "Change  of  Control"  means  the  occurrence  of one or more of the
following  events:  (a) any sale,  lease,  exchange  or other  transfer  (in one
transaction or a series of related  transactions) of all or substantially all of
the assets of the Company to any Person or group of related Persons for purposes
of Section  13(d) of the Exchange Act (a "Group")  (whether or not  otherwise in
compliance  with the  provisions  of this  Indenture);  (b) the  approval by the
holders  of  Capital  Stock  of the  Company  of any  plan or  proposal  for the
liquidation  or  dissolution  of  the  Company  (whether  or  not  otherwise  in
compliance with the provisions of this Indenture); (c) any Person or Group shall
become the owner,  directly or indirectly,  beneficially or of record, of shares
representing more than 35% of the aggregate ordinary voting power represented by
the issued and outstanding  Capital Stock of the Company; or (d) the replacement
of a majority of the Board of Directors  of the Company  over a two-year  period
from the directors who  constituted the Board of Directors of the Company at the
beginning of such period with directors  whose  replacement  shall not have been
approved (by  recommendation,  nomination or election,  as the case may be) by a
vote of at least a majority of the Board of  Directors of the Company then still
in office who either were members of such Board of Directors at the beginning of
such  period  or whose  election  as a member  of such  Board of  Directors  was
previously so approved.

            "Change of Control Offer" has the meaning provided in Section 4.15.

            "Change of Control Payment Date" has the meaning provided in Section
4.15.

            "Commission" means the SEC.

            "Common Stock" of any Person means any and all shares,  interests or
other  participations in, and other equivalents  (however designated and whether
voting or non-voting) of such Person's common stock,  whether outstanding on the
Issue Date or issued after the Issue Date, and includes, without limitation, all
series and classes of such common stock.

            "Company" means Abraxas Petroleum Corporation, a Nevada corporation.

                                     5
145385.01


<PAGE>




            "Company Properties" means all Properties,  and equity,  partnership
or other ownership interests therein, that are related or incidental to, or used
or  useful  in  connection  with,  the  conduct  or  operation  of any  business
activities of the Company or the Subsidiaries, which business activities are not
prohibited by the terms of the Indenture.

            "Consolidated  EBITDA"  means,  for any  period,  the  sum  (without
duplication) of (a) Consolidated  Net Income and (b) to the extent  Consolidated
Net Income has been reduced thereby, (i) all income taxes of the Company and its
Restricted  Subsidiaries paid or accrued in accordance with GAAP for such period
(other than income taxes attributable to extraordinary,  unusual or nonrecurring
gains or losses  or taxes  attributable  to sales or  dispositions  outside  the
ordinary course of business),  (ii)  Consolidated  Interest  Expense,  (iii) the
amount of any Preferred  Stock  dividends paid by the Company and its Restricted
Subsidiaries and (iv)  Consolidated  Non-cash  Charges,  less any non-cash items
increasing  Consolidated  Net Income for such  period,  all as  determined  on a
consolidated basis for the Company and its Restricted Subsidiaries in accordance
with GAAP.

            "Consolidated  EBITDA  Coverage  Ratio"  means,  with respect to the
Company,  the ratio of (a)  Consolidated  EBITDA of the Company  during the four
full fiscal  quarters  for which  financial  information  in respect  thereof is
available  (the  "Four  Quarter  Period")  ending on or prior to the date of the
transaction  giving  rise  to the  need to  calculate  the  Consolidated  EBITDA
Coverage Ratio (the "Transaction Date") to (b) Consolidated Fixed Charges of the
Company for the Four Quarter  Period.  In addition to and without  limitation of
the  foregoing,  for  purposes  of this  definition,  "Consolidated  EBITDA" and
"Consolidated  Fixed Charges" shall be calculated  after giving effect  (without
duplication) on a pro forma basis for the period of such  calculation to (a) the
incurrence  or  repayment  of  any  Indebtedness  of the  Company  or any of its
Restricted  Subsidiaries  (and the  application of the proceeds  thereof) giving
rise to the need to make such  calculation  and any  incurrence  or repayment of
other Indebtedness (and the application of the proceeds thereof), other than the
incurrence or repayment of  indebtedness  in the ordinary course of business for
working  capital  purposes  pursuant to working  capital  facilities,  occurring
during the Four Quarter Period or at any time  subsequent to the last day of the
Four  Quarter  Period  and on or  prior  to the  Transaction  Date,  as if  such
incurrence or repayment, as the case may be (and the application of the proceeds
thereof), occurred on the first day of the Four Quarter Period and (b) any Asset
Sales  or  Asset  Acquisitions   (including,   without  limitation,   any  Asset
Acquisition  giving rise to the need to make such calculation as a result of the
Company or one of its Restricted  Subsidiaries (including any Person who becomes
a  Restricted  Subsidiary  as a  result  of the  Asset  Acquisition)  incurring,
assuming  or  otherwise  being  liable  for  Acquired  Indebtedness,   and  also
including,  without  limitation,  any  Consolidated  EBITDA  attributable to the
assets which are the subject of the Asset  Acquisition  or Asset Sale during the
Four Quarter  Period)  occurring  during the Four Quarter  Period or at any time
subsequent  to the last day of the Four  Quarter  Period  and on or prior to the
Transaction  Date,  as if such Asset Sale or Asset  Acquisition  (including  the
incurrence, assumption or liability for any such Acquired Indebtedness) occurred
on the  first  day of the Four  Quarter  Period.  If the  Company  or any of its
Restricted  Subsidiaries  directly or indirectly  guarantees  Indebtedness  of a
third Person, the preceding sentence shall give effect to the incurrence of such
guaranteed Indebtedness as if the Company or

                                     6
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the  Restricted  Subsidiary,  as the  case  may be,  had  directly  incurred  or
otherwise  assumed such  guaranteed  Indebtedness.  Furthermore,  in calculating
"Consolidated  Fixed Charges" for purposes of determining the  denominator  (but
not the numerator) of this "Consolidated EBITDA Coverage Ratio," (i) interest on
outstanding Indebtedness determined on a fluctuating basis as of the Transaction
Date and which will continue to be so determined  thereafter  shall be deemed to
have  accrued at a fixed rate per annum  equal to the rate of  interest  on such
Indebtedness  in  effect  on the  Transaction  Date;  (ii)  if  interest  on any
Indebtedness  actually  incurred  on the  Transaction  Date  may  optionally  be
determined at an interest rate based upon a factor of a prime or similar rate, a
eurocurrency  interbank  offered rate, or other rates, then the interest rate in
effect on the Transaction  Date will be deemed to have been in effect during the
Four Quarter Period; (iii) notwithstanding  clauses (i) and (ii) above, interest
on Indebtedness  determined on a fluctuating  basis, to the extent such interest
is covered by agreements relating to Interest Swap Obligations,  shall be deemed
to accrue at the rate per annum  resulting  after giving effect to the operation
of such agreements.

            "Consolidated  Fixed Charges" means, with respect to the Company for
any period, the sum, without duplication,  of (a) Consolidated  Interest Expense
(including any premium or penalty paid in connection  with redeeming or retiring
Indebtedness of the Company and its Restricted  Subsidiaries prior to the stated
maturity thereof pursuant to the agreements  governing such Indebtedness),  plus
(b) the  product of (i) the  amount of all  dividend  payments  on any series of
Preferred  Stock of the Company (other than dividends paid in Qualified  Capital
Stock) paid, accrued or scheduled to be paid or accrued during such period times
(ii) a fraction,  the numerator of which is one and the  denominator of which is
one minus  the then  current  effective  consolidated  federal,  state and local
income tax rate of such Person, expressed as a decimal.

            "Consolidated  Interest  Expense" means, with respect to the Company
for any  period,  the sum of,  without  duplication:  (a) the  aggregate  of the
interest expense of the Company and its Restricted  Subsidiaries for such period
determined on a consolidated  basis in accordance with GAAP,  including  without
limitation,  (i) any amortization of original issue discount, (ii) the net costs
under Interest Swap  Obligations,  (iii) all  capitalized  interest and (iv) the
interest  portion  of any  deferred  payment  obligation;  and (b) the  interest
component of Capitalized Lease Obligations paid,  accrued and/or scheduled to be
paid or accrued by the  Company  and its  Restricted  Subsidiaries  during  such
period, as determined on a consolidated basis in accordance with GAAP.

            "Consolidated Net Income" means, with respect to the Company for any
period,  the  aggregate  net income (or loss) of the Company and its  Restricted
Subsidiaries for such period on a consolidated  basis,  determined in accordance
with  GAAP;  provided,  however,  that there  shall be  excluded  therefrom  (a)
after-tax gains from Asset Sales or abandonments or reserves  relating  thereto,
(b) after-tax items classified as  extraordinary or nonrecurring  gains, (c) the
net  income of any  Person  acquired  in a "pooling  of  interests"  transaction
accrued  prior to the date it becomes a  Restricted  Subsidiary  or is merged or
consolidated with the Company or any Restricted  Subsidiary,  (d) the net income
(but not loss) of any Restricted  Subsidiary to the extent that the  declaration
of dividends or similar

                                     7
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distributions  by that  Restricted  Subsidiary  of that income is  restricted by
charter,  contract,  operation  of law or  otherwise,  (e) the net income of any
Person in which the Company has an interest, other than a Restricted Subsidiary,
except to the extent of cash  dividends or  distributions  actually  paid to the
Company  or to a  Restricted  Subsidiary  by such  Person,  (f)  income  or loss
attributable  to  discontinued   operations   (including,   without  limitation,
operations  disposed of during such period whether or not such  operations  were
classified as discontinued) and (g) in the case of a successor to the Company by
consolidation  or merger or as a transferee  of the  Company's  assets,  any net
income  (or  loss) of the  successor  corporation  prior to such  consolidation,
merger or transfer of assets.

            "Consolidated  Net  Worth" of any  Person  as of any date  means the
consolidated  stockholders' equity of such Person,  determined on a consolidated
basis in accordance with GAAP, less (without  duplication)  amounts attributable
to Disqualified Capital Stock of such Person.

            "Consolidated  Non-Cash Charges" means, with respect to the Company,
for any period, the aggregate  depreciation,  depletion,  amortization and other
non-cash  expenses  of the  Company  and its  Restricted  Subsidiaries  reducing
Consolidated  Net  Income  of the  Company  for  such  period,  determined  on a
consolidated   basis  in  accordance  with  GAAP  (excluding  any  such  charges
constituting an extraordinary  item or loss or any such charge which requires an
accrual of or a reserve for cash charges for any future period).

            "Consolidation" means, with respect to any Person, the consolidation
of the accounts of the Restricted Subsidiaries of such Person with those of such
Person, all in accordance with GAAP;  provided,  however,  that  "consolidation"
will not include consolidation of the accounts of any Unrestricted Subsidiary of
such Person with the  accounts of such  Person.  The term  "consolidated"  has a
correlative meaning to the foregoing.

            "Corporate Trust Office" means the office of the Trustee at which at
any  particular   time  its  corporate   trust  business  shall  be  principally
administered, which office at the date of execution of this Indenture is located
at One State Street, Eleventh Floor, New York, New York 10004.

            "Covenant Defeasance" has the meaning set forth in Section 8.01.

            "Crude Oil and  Natural  Gas  Business"  means (i) the  acquisition,
exploration, development, operation and disposition of interests in oil, gas and
other hydrocarbon  properties located in North America,  and (ii) the gathering,
marketing,  treating,  processing,  storage,  selling  and  transporting  of any
production from such interests or properties of the Company or of others.

            "Crude Oil and Natural Gas Hedge Agreements"  means, with respect to
any Person,  any oil and gas agreements and other  agreements or arrangements or
any  combination  thereof  entered into by such Person in the ordinary course of
business and that is designed to provide  protection against oil and natural gas
price fluctuations.

                                     8
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            "Crude  Oil  and  Natural  Gas  Properties"  means  all  Properties,
including equity or other ownership interests therein, owned by any Person which
have been  assigned  "proved  oil and gas  reserves"  as defined in Rule 4-10 of
Regulation S-X of the Securities Act as in effect on the Issue Date.

            "Crude Oil and Natural Gas Related  Assets" means any  Investment or
capital   expenditure  (but  not  including  additions  to  working  capital  or
repayments of any revolving credit or working capital borrowings) by the Company
or any Subsidiary of the Company which is related to the business of the Company
and its  Subsidiaries  as it is  conducted  on the date of the Asset Sale giving
rise to the Net Cash Proceeds to be reinvested.

            "Currency  Agreement" means any foreign exchange contract,  currency
swap agreement or other similar agreement or arrangement designed to protect the
Company or any  Restricted  Subsidiary of the Company  against  fluctuations  in
currency values.

            "Custodian"  means  any  receiver,  trustee,  assignee,  liquidator,
sequestrator or similar official under any Bankruptcy Law.

            "Default" means an event or condition the occurrence of which is, or
with the lapse of time or the  giving  of  notice or both  would be, an Event of
Default.

            "Depository" means The Depository Trust Company, its nominees and
successors.

            "Disqualified Capital Stock" means that portion of any Capital Stock
which,  by  its  terms  (or by  the  terms  of any  security  into  which  it is
convertible  or for  which it is  exchangeable),  or upon the  happening  of any
event,  matures  or  is  mandatorily  redeemable,  pursuant  to a  sinking  fund
obligation or otherwise,  or is mandatorily redeemable at the sole option of the
holder  thereof,  in whole or in part,  in either case, on or prior to the final
maturity of the Notes.

            "Equity  Offering"  means an offering of Qualified  Capital Stock of
the Company.

            "Event of Default" has the meaning provided in Section 6.01.

            "Exchange  Act"  means  the  Securities  Exchange  Act of  1934,  as
amended, or any successor statute or statutes thereto.

            "Exchange Notes" has the meaning provided in the preamble to this
Indenture.

            "fair market  value"  means,  with respect to any asset or property,
the price which could be negotiated in an arm's-length, free market transaction,
for cash, between

                                     9
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an informed  and willing  seller and an informed and willing  buyer,  neither of
whom is under undue  pressure or  compulsion to complete the  transaction.  Fair
market value shall be determined by the Board of Directors of the Company acting
reasonably and in good faith and shall be evidenced by a Board Resolution of the
Company delivered to the Trustee;  provided,  however, that (A) if the aggregate
non-cash  consideration  to  be  received  by  the  Company  or  any  Restricted
Subsidiary from any Asset Sale shall reasonably be expected to exceed $5,000,000
or (B) if the net worth of any  Restricted  Subsidiary  to be  designated  as an
Unrestricted Subsidiary shall reasonably be expected to exceed $10,000,000, then
fair market value shall be determined by an Independent Advisor.

            "GAAP" means generally accepted  accounting  principles set forth in
the  opinions  and  pronouncements  of the  Accounting  Principles  Board of the
American   Institute  of  Certified   Public   Accountants  and  statements  and
pronouncements  of the Financial  Accounting  Standards  Board as of any date of
determination.

            "Global Note" has the meaning provided in Section 2.01.

            "Grey  Wolf"  means,   Grey  Wolf   Exploration   Ltd.,  an  Alberta
corporation.

            "guarantee"  means any obligation,  contingent or otherwise,  of any
Person directly or indirectly  guaranteeing any Indebtedness or other obligation
of any other Person and, without  limiting the generality of the foregoing,  any
obligation,  direct or indirect,  contingent or otherwise, of such Person (i) to
purchase or pay (or advance or supply funds for the purchase or payment of) such
Indebtedness or other obligation of such other Person (whether arising by virtue
of partnership  arrangements,  or by agreement to keep-well, to purchase assets,
goods,  securities  or  services,  to  take-or-pay,  or  to  maintain  financial
statement conditions or otherwise) or (ii) entered into for purposes of assuring
in any other manner the obligee of such  Indebtedness or other obligation of the
payment  thereof or to protect such obligee  against loss in respect thereof (in
whole  or in part)  (but if in  part,  only to the  extent  thereof);  provided,
however,  that the term  "guarantee"  shall not  include  (A)  endorsements  for
collection  or deposit in the  ordinary  course of business  and (B) guar antees
(other than guarantees of  Indebtedness)  by the Company in respect of assisting
one or more Subsidiaries in the ordinary course of their respective  businesses,
including  without  limitation  guarantees  of trade  obligations  and operating
leases,  on ordinary  business terms.  The term "guarantee" used as a verb has a
corresponding meaning.

            "Guarantees"  means the  guarantees  of the  obligations  under this
Indenture  and the Notes by the  Subsidiary  Guarantors  as set forth in Article
Eleven hereof.

            "Holder" means any Person holding a Note.

            "Hydrocarbons"  means  oil,  gas,  casinghead  gas,  drip  gasoline,
natural  gasoline,   condensate,   distillate,   liquid  hydrocarbons,   gaseous
hydrocarbons and all  constituents,  elements or compounds  thereof and products
processed therefrom.

            "incur" has the meaning set forth in Section 4.12.

                                     10
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            "Indebtedness"   means   with   respect  to  any   Person,   without
duplication,  (a) all  Obligations  of such Person for borrowed  money,  (b) all
Obligations  of such  Person  evidenced  by  bonds,  debentures,  notes or other
similar  instruments,  (c) all Capitalized Lease Obligations of such Person, (d)
all Obligations of such Person issued or assumed as the deferred  purchase price
of property,  all conditional  sale  obligations  and all Obligations  under any
title  retention  agreement (but  excluding  trade  accounts  payable),  (e) all
Obligations for the reimbursement of any obligor on a letter of credit, banker's
acceptance or similar credit  transaction,  (f) guarantees and other  contingent
obligations  in respect of  Indebtedness  referred to in clauses (a) through (e)
above and clause (h) below,  (g) all Obligations of any other Person of the type
referred  to in clauses  (a)  through (f) above which are secured by any Lien on
any property or asset of such Person, the amount of such Obligation being deemed
to be the  lesser  of the fair  market  value of such  property  or asset or the
amount  of the  Obligation  so  secured,  (h)  all  Obligations  under  Currency
Agreements and Interest Swap Obligations and (i) all Disqualified  Capital Stock
issued by such  Person  with the  amount  of  Indebtedness  represented  by such
Disqualified  Capital  Stock  being  equal to the  greater of its  voluntary  or
involuntary  liquidation  preference and its maximum fixed  Redemption  Price or
repurchase  price. For purposes hereof,  the "maximum fixed repurchase price" of
any  Disqualified  Capital  Stock which does not have a fixed  repurchase  price
shall be calculated in accordance  with the terms of such  Disqualified  Capital
Stock as if such Disqualified  Capital Stock were purchased on any date on which
Indebtedness shall be required to be determined pursuant to this Indenture,  and
if such price is based  upon,  or  measured  by, the fair  market  value of such
Disqualified   Capital  Stock,  such  fair  market  value  shall  be  determined
reasonably  and in good  faith by the Board of  Directors  of the  Company.  The
"amount" or "principal  amount" of Indebtedness at any time of  determination as
used herein  represented by (a) any Indebtedness  issued at a price that is less
than the  principal  amount at maturity  thereof shall be the face amount of the
liability in respect thereof,  (b) any Capitalized Lease Obligation shall be the
amount  determined in accordance with the definition  thereof,  (c) any Interest
Swap Obligations  included in the definition of Permitted  Indebtedness shall be
zero,  (d) all  other  unconditional  obligations  shall  be the  amount  of the
liability  thereof  determined  in  accordance  with  GAAP  and  (e)  all  other
contingent  obligations  shall be the  maximum  liability  at such  date of such
Person.

            "Indenture"  means this Indenture,  as amended or supplemented  from
time to time in accordance with the terms hereof.

            "Independent  Advisor"  means a reputable  accounting,  appraisal or
nationally  recognized  investment  banking,  engineering or consulting firm (a)
which does not, and whose  directors,  officers and  employees or  Affiliates do
not, have a direct or indirect  material  financial  interest in the Company and
(b)  which,  in the  judgment  of the  Board of  Directors  of the  Company,  is
otherwise disinterested, independent and qualified to perform the task for which
it is to be engaged.

            "Initial  Notes" has the meaning  provided  in the  preamble to this
Indenture.

            "Initial Purchasers" means, collectively, BT Securities Corporation,
Bankers

                                     11
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            Trust  International plc,  Jefferies & Company,  Inc. and ING Baring
(U.S.) Securities Corporation.

            "Institutional  Accredited Investor" means an institution that is an
"accredited investor" as that term is defined in Rule 501(a)(1), (2), (3) or (7)
under the Securities Act.

            "interest,"  when used with  respect to any Note means the amount of
all interest accruing on such Note,  including any applicable defaulted interest
pursuant  to  Section  2.12  and  any  Additional   Interest   pursuant  to  the
Registration Rights Agreement.

            "Interest  Payment Date" means the stated maturity of an installment
of interest on the Notes.

            "Interest  Swap  Obligations"  means the  obligations  of any Person
pursuant  to any  arrangement  with  any  other  Person,  whereby,  directly  or
indirectly,  such  Person is  entitled  to  receive  from time to time  periodic
payments calculated by applying either a floating or a fixed rate of interest on
a stated notional  amount in exchange for periodic  payments made by such Person
calculated  by  applying  a fixed or a  floating  rate of  interest  on the same
notional  amount and shall  include,  without  limitation,  interest rate swaps,
caps, floors, collars and similar agreements.

            "Internal  Revenue Code" means the Internal Revenue Code of 1986, as
amended to the date hereof and from time to time hereafter.

            "Investment"  means,  with  respect  to any  Person,  any  direct or
indirect  (i) loan,  advance or other  extension of credit  (including,  without
limitation, a guarantee) or capital contribution to (by means of any transfer of
cash or other  property  (valued at the fair market value thereof as of the date
of  transfer)  others or any payment for property or services for the account or
use of  others),  (ii)  purchase  or  acquisition  by such Person of any Capital
Stock, bonds, notes, debentures or other securities or evidences of Indebtedness
issued  by, any  Person  (whether  by  merger,  consolidation,  amalgamation  or
otherwise  and  whether  or not  purchased  directly  from  the  issuer  of such
securities or evidences of  Indebtedness),  (iii) guarantee or assumption of the
Indebtedness  of any other Person  (other than the  guarantee or  assumption  of
Indebtedness  of such Person or a  Restricted  Subsidiary  of such Person  which
guarantee or  assumption is made in  compliance  with the  provisions of Section
4.12), and (iv) other items that would be classified as investments on a balance
sheet of such  Person  prepared in  accordance  with GAAP.  Notwithstanding  the
foregoing,  "Investment" shall exclude extensions of trade credit by the Company
and its Restricted  Subsidiaries on commercially  reasonable terms in accordance
with normal trade practices of the Company or such Restricted Subsidiary, as the
case may be. The amount of any Investment shall not be adjusted for increases or
decreases in value, or write-ups, write-downs or write-offs with respect to such
Investment.  If the  Company or any  Restricted  Subsidiary  sells or  otherwise
disposes of any Capital  Stock of any  Restricted  Subsidiary  such that,  after
giving effect to any such sale or  disposition,  it ceases to be a Subsidiary of
the Company,  the Company shall be deemed to have made an Investment on the date
of any such sale or  disposition  equal to the fair market  value of the Capital
Stock of such Restricted Subsidiary not sold or disposed of.

                                     12
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            "Issue Date" means the date of original issuance of the Notes.

            "Issuers" means the Company and Canadian Abraxas.

            "Legal Defeasance" has the meaning set forth in Section 8.01.

            "Legal Holiday" has the meaning provided in Section 10.07.

            "Lien" means any lien,  mortgage,  deed of trust,  pledge,  security
interest,  charge or encumbrance of any kind (including any conditional  sale or
other  title  retention  agreement,  any  lease in the  nature  thereof  and any
agreement to give any security interest).

            "Material  Change"  means an  increase  or decrease of more than 10%
during a fiscal  quarter in the  discounted  future  net cash  flows  (excluding
changes  that  result  solely  from  changes in prices)  from proved oil and gas
reserves  of the  Company  and  consolidated  Subsidiaries  (before any state or
federal income tax); provided, however, that the following will be excluded from
the Material Change calculation:  (i) any acquisitions during the quarter of oil
and gas reserves that have been estimated by independent petroleum engineers and
on which a report or reports exist, (ii) any disposition of properties  existing
at the  beginning  of such  quarter  that have been  disposed  of as provided in
Section 4.16 and (iii) any reserves added during the quarter attributable to the
drilling or  recompletion of wells not included in previous  reserve  estimates,
but which will be included in future quarters.

            "Maturity Date" means November 1, 2004.

            "Moody's" means Moody's Investors Service, Inc. and its successors.

            "Net Cash  Proceeds"  means,  with  respect to any Asset  Sale,  the
proceeds in the form of cash or Cash Equivalents  including  payments in respect
of  deferred  payment  obligations  when  received  in the  form of cash or Cash
Equivalents  received by the Company or any of its Restricted  Subsidiaries from
such Asset Sale net of (a) reasonable  out-of-pocket  expenses and fees relating
to such  Asset  Sale  (including,  without  limitation,  legal,  accounting  and
investment banking fees and sales commissions),  (b) taxes paid or payable after
taking into account any reduction in consolidated tax liability due to available
tax credits or  deductions  and any tax sharing  arrangements,  (c) repayment of
Indebtedness  that is required to be repaid in  connection  with such Asset Sale
and (d) appropriate  amounts  (determined by the Chief Financial  Officer of the
Company) to be provided by the Company or any Restricted Subsidiary, as the case
may be,  as a  reserve,  in  accordance  with  GAAP,  against  any  post-closing
adjustments or liabilities  associated  with such Asset Sale and retained by the
Company or any Restricted Subsidiary, as the case may be, after such Asset Sale,
including,  without  limitation,   pension  and  other  post-employment  benefit
liabilities,  liabilities related to environmental matters and liabilities under
any indemnification  obligations  associated with such Asset Sale (but excluding
any payments  which, by the terms of the  indemnities,  will not, be made during
the term of the Notes).

                                     13
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            "Net Proceeds Offer" has the meaning set forth in Section 4.16.

            "Net  Proceeds  Offer  Amount"  has the meaning set forth in Section
4.16.

            "Net  Proceeds  Offer  Payment  Date" has the  meaning  set forth in
Section 4.16.

            "Net  Proceeds  Offer  Trigger  Date" has the  meaning  set forth in
Section 4.16.

            "Net Working  Capital"  means (i) all current  assets of the Company
and its  consolidated  Subsidiaries,  minus (ii) all current  liabilities of the
Company and its consolidated  Subsidiaries,  except current liabilities included
in  Indebtedness,  in each  case as set  forth in  financial  statements  of the
Company prepared in accordance with GAAP.

            "New  Credit  Facility"  means  the  Credit  Agreement  dated  as of
September 30, 1996, by and among the Company,  Bankers Trust Company,  as Agent,
and each of the lenders named therein, or any successor or replacement agreement
and whether by the same or any other agent, lender or group of lenders, together
with the related documents thereto (including, without limitation, any guarantee
agreements  and  security  documents),  in each case as such  agreements  may be
amended  (including  any amendment and  restatement  thereof),  supplemented  or
otherwise  modified from time to time,  including any  agreements  extending the
maturity of, refinancing,  replacing,  increasing or otherwise restructuring all
or any portion of the Indebtedness under such agreements.

            "Non-Recourse Indebtedness" with respect to any Person means
Indebtedness of such Person for which (i) the sole legal recourse for collection
of principal and interest on such  Indebtedness is against the specific property
identified in the instruments  evidencing or securing such Indebtedness and such
property  was  acquired  with  the  proceeds  of  such   Indebtedness   or  such
Indebtedness  was Incurred within 90 days after the acquisition of such property
and (ii) no other assets of such Person may be realized  upon in  collection  of
principal or interest on such  Indebtedness;  provided,  however,  that any such
Indebtedness  shall  not  cease to be  "Non-Recourse  Indebtedness"  solely as a
result of the instrument  governing such Indebtedness  containing terms pursuant
to which such Indebtedness  becomes recourse upon (a) fraud or misrepresentation
by the Person in connection with such  Indebtedness,  (b) such Person failing to
pay taxes or other  charges  that result in the creation of liens on any portion
of the specific  property  securing such Indebtedness or failing to maintain any
insurance  on  such  property  required  under  the  instruments  securing  such
Indebtedness, (c) the conversion of any of the collateral for such Indebtedness,
(d) such Person failing to maintain any of the collateral for such  Indebtedness
in the condition required under the instruments  securing the Indebtedness,  (e)
any income generated by the specific property  securing such Indebtedness  being
applied  in a manner not  otherwise  allowed in the  instruments  securing  such
Indebtedness,  (f) the violation of any  applicable  law or ordinance  governing
hazardous  materials or  substances  or otherwise  affecting  the  environmental
condition of the specific  property  securing the Indebtedness or (g) the rights
of the  holder of such  Indebtedness  to the  specific  property  are  impaired,
suspended or reduced by any act, omission or

                                     14
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<PAGE>




misrepresentation  of such Person;  provided,  further,  however,  that upon the
occurrence  of any of the  foregoing  clauses (a)  through  (g) above,  any such
Indebtedness which shall have ceased to be "Non-Recourse  Indebtedness" shall be
deemed to have been Indebtedness incurred by such Person at such time.

            "Non-U.S.  Person"  means  a  person  who is not a U.S.  person,  as
defined in Regulation S.

            "Notes" means the Initial Notes and the Exchange  Notes treated as a
single  class of  securities,  as amended or  supplemented  from time to time in
accordance with the terms hereof, that are issued pursuant to this Indenture.

            "Obligations"   means  all  obligations   for  principal,   premium,
interest, penalties, fees, indemnifications,  reimbursements,  damages and other
liabilities payable under the documentation governing any Indebtedness.

            "Offering  Memorandum"  means the confidential  Offering  Memorandum
dated November 5, 1996 of the Issuers relating to the offering of the Notes.

            "Officer"  means,  with  respect to any Person,  the Chairman of the
Board of  Directors,  the  Chief  Executive  Officer,  the  President,  any Vice
President,  the Chief Financial Officer, the Treasurer,  the Controller,  or the
Secretary  of such  Person,  or any  other  officer  designated  by the Board of
Directors serving in a similar capacity.

            "Officers'  Certificate"  means a certificate signed by two Officers
of each of the Issuers.

            "Opinion of Counsel" means a written  opinion from legal counsel who
is  reasonably  acceptable to the Trustee  complying  with the  requirements  of
Sections 10.04 and 10.05, as they relate to the giving of an Opinion of Counsel.

            "Paying Agent" has the meaning provided in Section 2.03.

            "Payment  Restriction"  shall have the  meaning set forth in Section
4.13.

            "Permitted  Indebtedness" means,  without  duplication,  each of the
following:

            (a)   Indebtedness under the Notes, the Exchange Notes, the Private
      Exchange Notes, if any, this Indenture and the Guarantees;

            (b) Indebtedness  incurred pursuant to the New Credit Facility in an
      aggregate   principal  amount  at  any  time  outstanding  not  to  exceed
      $50,000,000,  reduced  by any  required  permanent  repayments  (which are
      accompanied by a corresponding permanent commitment reduction) thereunder;

            (c)  Interest  Swap  Obligations  of  the  Company  or a  Restricted
      Subsidiary covering Indebtedness of the Company or any of its Restricted

                                     15
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<PAGE>




      
      Subsidiaries;  provided,  however, that such Interest Swap Obligations are
      entered into to protect the Company and its Restricted  Subsidiaries  from
      fluctuations in interest rates on Indebtedness incurred in accordance with
      this  Indenture  to the  extent  the  notional  principal  amount  of such
      Interest  Swap  Obligations  does not exceed the  principal  amount of the
      Indebtedness to which such Interest Swap Obligation relates;

            (d)  Indebtedness of a Restricted  Subsidiary to the Company or to a
      Wholly Owned  Restricted  Subsidiary for so long as such  Indebtedness  is
      held by the Company or a Wholly Owned Restricted Subsidiary,  in each case
      subject  to no Lien held by a Person  other  than the  Company or a Wholly
      Owned Restricted Subsidiary; provided, however, that if as of any date any
      Person other than the Company or a Wholly Owned Restricted Subsidiary owns
      or  holds  any  such  Indebtedness  or  holds  a Lien in  respect  of such
      Indebtedness, such date shall be deemed the incurrence of Indebtedness not
      constituting Permitted Indebtedness by the issuer of such Indebtedness;

            (e)  Indebtedness  of  the  Company  to a  Wholly  Owned  Restricted
      Subsidiary  for so long as such  Indebtedness  is held by a  Wholly  Owned
      Restricted Subsidiary, in each case subject to no Lien; provided, however,
      that (i) any  Indebtedness  of the Company to any Wholly Owned  Restricted
      Subsidiary   that  is  not  a  Subsidiary   Guarantor  is  unsecured   and
      subordinated,   pursuant  to  a  written   agreement,   to  the  Company's
      obligations  under the  Indenture and the Notes and (ii) if as of any date
      any Person other than a Wholly Owned  Restricted  Subsidiary owns or holds
      any such  Indebtedness  or holds a Lien in respect  of such  Indebtedness,
      such date shall be deemed the incurrence of Indebtedness  not constituting
      Permitted Indebtedness by the Company;

            (f)  Indebtedness  arising  from  the  honoring  by a bank or  other
      financial   institution   of  a  check,   draft  or   similar   instrument
      inadvertently  (except in the case of daylight  overdrafts)  drawn against
      insufficient funds in the ordinary course of business;  provided, however,
      that  such  Indebtedness  is  extinguished  within  two  Business  Days of
      incurrence;

            (g)   Indebtedness   of  the  Company  or  any  of  its   Restricted
      Subsidiaries  represented  by  letters  of credit  for the  account of the
      Company  or such  Restricted  Subsidiary,  as the case may be, in order to
      provide security for workers' compensation claims,  payment obligations in
      connection  with  self-insurance  or similar  requirements in the ordinary
      course of business;

            (h)   Refinancing Indebtedness;

            (i) Capitalized Lease Obligations of the Company  outstanding on the
      Issue Date;

            (j) Capitalized Lease Obligations and Purchase Money Indebtedness of

                                     16
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<PAGE>




      the Company or any of its Restricted Subsidiaries not to exceed $5,000,000
      at any one time outstanding;

            (k)   Permitted Operating Obligations;

            (l) Obligations arising in connection with Crude Oil and Natural Gas
      Hedge Agreements of the Company or a Restricted Subsidiary;

            (m)   Non-Recourse Indebtedness;

            (n) Indebtedness under Currency Agreements;  provided, however, that
      in the case of Currency  Agreements  which  relate to  Indebtedness,  such
      Currency  Agreements do not increase the  Indebtedness  of the Company and
      its  Restricted  Subsidiaries  outstanding  other  than  as  a  result  of
      fluctuations  in  foreign  currency  exchange  rates or by reason of fees,
      indemnities and compensation payable thereunder;

            (o) additional  Indebtedness of the Company or any of its Restricted
      Subsidiaries in an aggregate  principal amount at any time outstanding not
      to exceed  the  greater  of (i)  $10.0  million  or (ii) 5.0% of  Adjusted
      Consolidated Net Tangible Assets of the Company; and

            (p)   Indebtedness outstanding on the Issue Date.

            "Permitted  Industry  Investments"  means (i) capital  expenditures,
including, without limitation,  acquisitions of Company Properties and interests
therein;  (ii) (a) entry into  operating  agreements,  joint  ventures,  working
interests,  royalty interests,  mineral leases, unitization agreements,  pooling
arrangements or other similar or customary agreements, transactions, properties,
interests or  arrangements,  and  Investments  and  expenditures  in  connection
therewith or pursuant thereto, in each case made or entered into in the ordinary
course of the oil and gas business,  and (b) exchanges of Company Properties for
other  Company  Properties  of at least  equivalent  value as determined in good
faith by the  Board of  Directors  of the  Company;  and  (iii)  Investments  of
operating  funds on behalf of co-owners of Crude Oil and Natural Gas  Properties
of the Company or the Subsidiaries pursuant to joint operating agreements.

            "Permitted  Investments" means (a) Investments by the Company or any
Restricted  Subsidiary  in any Person that is or will become  immediately  after
such Investment a Restricted  Subsidiary or that will merge or consolidate  into
the  Company or a  Restricted  Subsidiary  that is not  subject  to any  Payment
Restriction,  (b)  Investments  in the  Company  by any  Restricted  Subsidiary;
provided,  however, that any Indebtedness evidencing any such Investment held by
a  Restricted  Subsidiary  that is not a Subsidiary  Guarantor is unsecured  and
subordinated,  pursuant to a written  agreement,  to the  Company's  obligations
under  the  Notes  and  this  Indenture;   (c)  investments  in  cash  and  Cash
Equivalents;  (d) Investments made by the Company or its Restricted Subsidiaries
as a result of  consideration  received in connection with an Asset Sale made in
compliance with Section 4.16; and (e) Permitted Industry Investments.

                                     17
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<PAGE>




            "Permitted Liens" means each of the following types of Liens:

            (a) Liens  existing  as of the Issue  Date to the  extent and in the
      manner  such  Liens are in effect on the Issue  Date (and any  extensions,
      replacements or renewals  thereof  covering  property or assets secured by
      such Liens on the Issue Date);

            (b) Liens  securing  Indebtedness  outstanding  under the New Credit
      Facility and Liens arising under the Indenture;

            (c)   Liens securing the Notes and the Guarantees;

            (d) Liens of the Company or a Restricted Subsidiary on assets of any
      Restricted Subsidiary;

            (e) Liens  securing  Refinancing  Indebtedness  which is incurred to
      Refinance  any  Indebtedness  which has been  secured by a Lien  permitted
      under this  Indenture and which has been  incurred in accordance  with the
      provisions of this Indenture;  provided,  however, that such Liens (x) are
      no  less  favorable  to the  Holders  and are not  more  favorable  to the
      lienholders  with  respect  to such Liens than the Liens in respect of the
      Indebtedness  being  Refinanced  and (y) do not  extend  to or  cover  any
      property  or assets of the Company or any of its  Restricted  Subsidiaries
      not securing the Indebtedness so Refinanced;

            (f) Liens for taxes,  assessments or governmental  charges or claims
      either (i) not  delinquent or (ii)  contested in good faith by appropriate
      proceedings and as to which the Company or a Restricted Subsidiary, as the
      case may be,  shall  have set aside on its books such  reserves  as may be
      required pursuant to GAAP;

            (g)  statutory  and  contractual  Liens of  landlords to secure rent
      arising in the ordinary course of business to the extent such Liens relate
      only to the  tangible  property  of the  lessee  which is  located on such
      property  and  Liens  of  carriers,  warehousemen,  mechanics,  suppliers,
      materialmen,  repairmen  and other  Liens  imposed by law  incurred in the
      ordinary course of business for sums not yet delinquent or being contested
      in good faith, if such reserve or other appropriate provision,  if any, as
      shall be required by GAAP shall have been made in respect thereof;

            (h)  Liens  incurred  or  deposits  made in the  ordinary  course of
      business  (i)  in  connection  with  workers'  compensation,  unemployment
      insurance and other types of social security,  including any Lien securing
      letters of credit  issued in the  ordinary  course of business  consistent
      with  past  practice  in  connection  therewith,  or  (ii) to  secure  the
      performance of tenders,  statutory  obligations,  surety and appeal bonds,
      bids, leases, government contracts, performance and return-of-money bonds

                                     18
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<PAGE>




      and other similar obligations (exclusive of obligations for the payment of
      borrowed money);

            (i)  judgment  and  attachment  Liens not giving rise to an Event of
      Default;

            (j)  easements,  rights-of-way,  zoning  restrictions,   restrictive
      covenants,  minor  imperfections  in title and other  similar  charges  or
      encumbrances  in respect of real property not  interfering in any material
      respect with the ordinary conduct of the business of the Company or any of
      its Restricted Subsidiaries;

            (k) any  interest or title of a lessor under any  Capitalized  Lease
      Obligation;  provided  that such  Liens do not extend to any  property  or
      assets  which is not leased  property  subject to such  Capitalized  Lease
      Obligation;

            (l) Liens securing Purchase Money Indebtedness of the Company or any
      Restricted  Subsidiary;  provided,  however,  that (i) the Purchase  Money
      Indebtedness shall not be secured by any property or assets of the Company
      or any  Restricted  Subsidiary  other  than the  property  and  assets  so
      acquired or constructed and (ii) the Lien securing such Indebtedness shall
      be created within 90 days of such acquisition or construction;

            (m)  Liens  securing  reimbursement   obligations  with  respect  to
      commercial  letters of credit which encumber  documents and other property
      relating to such letters of credit and products and proceeds thereof;

            (n) Liens encumbering  deposits made to secure  obligations  arising
      from statutory,  regulatory,  contractual, or warranty requirements of the
      Company or any of its Restricted Subsidiaries,  including rights of offset
      and set-off;

            (o) Liens  securing  Interest Swap  Obligations  which Interest Swap
      Obligations relate to Indebtedness that is otherwise  permitted under this
      Indenture and Liens securing Crude Oil and Natural Gas Hedge Agreements;

            (p) Liens securing Acquired Indebtedness incurred in accordance with
      Section 4.12; provided, however, that (i) such Liens secured such Acquired
      Indebtedness  at the time of and prior to the  incurrence of such Acquired
      Indebtedness  by the  Company  or a  Restricted  Subsidiary  and  were not
      granted in connection  with, or in anticipation of, the incurrence of such
      Acquired  Indebtedness by the Company or a Restricted  Subsidiary and (ii)
      such Liens do not extend to or cover any property or assets of the Company
      or of any of its Restricted Subsidiaries other than the property or assets
      that secured the Acquired Indebtedness prior to the time such Indebtedness
      became Acquired Indebtedness of the Company or a Restricted Subsidiary and
      are no more favorable to the lienholders  than those securing the Acquired
      Indebtedness prior to the incurrence of such Acquired  Indebtedness by the
      Company or a Restricted Subsidiary;


                                     19
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            (q) Liens on, or related  to,  properties  and assets of the Company
      and its  Subsidiaries to secure all or a part of the costs incurred in the
      ordinary  course  of  business  of  exploration,   drilling,  development,
      production, processing, transportation, marketing or storage, or operation
      thereof;

            (r)  Liens on  pipeline  or  pipeline  facilities,  Hydrocarbons  or
      properties and assets of the Company and its Subsidiaries  which arise out
      of operation of law;

            (s) royalties,  overriding royalties, revenue interests, net revenue
      interests,  net  profit  interests,   revisionary  interests,   production
      payments,  production  sales  contracts,  operating  agreements  and other
      similar  interests,  properties,   arrangements  and  agreements,  all  as
      ordinarily  exist with respect to Properties and assets of the Company and
      its  Subsidiaries  or  otherwise  as are  customary  in the  oil  and  gas
      business;

            (t) with respect to any Properties and assets of the Company and its
      Subsidiaries,  Liens arising under, or in connection  with, or related to,
      farm-out,  farm-in,  joint operation,  area of mutual interest  agreements
      and/or other  similar or customary  arrangements,  agreements or interests
      that  the  Company  or any  Subsidiary  determines  in  good  faith  to be
      necessary for the economic development of such Property;

            (u) any (a)  interest  or title of a lessor or  sublessor  under any
      lease,  (b) restriction or encumbrance  that the interest or title of such
      lessor or  sublessor  may be subject to  (including,  without  limitation,
      ground  leases or other prior leases of the demised  premises,  mortgages,
      mechanics'  liens, tax liens, and easements),  or (c) subordination of the
      interest of the lessee or sublessee  under such lease to any  restrictions
      or encumbrance referred to in the preceding clause (b);

            (v) Liens in favor of  collecting  or payor banks  having a right of
      setoff,  revocation,  refund  or  chargeback  with  respect  to  money  or
      instruments of the Company or any Restricted Subsidiary on deposit with or
      in possession of such bank; and

            (w)   Liens securing Non-recourse Indebtedness.

            "Permitted Operating  Obligations" means Indebtedness of the Company
or any  Restricted  Subsidiary  in  respect  of one or more  standby  letters of
credit, bid,  performance or surety bonds, or other  reimbursement  obligations,
issued for the  account of, or entered  into by, the  Company or any  Restricted
Subsidiary in the ordinary course of business (excluding  obligations related to
the purchase by the Company or any  Restricted  Subsidiary of  Hydrocarbons  for
which the Company or such  Restricted  Subsidiary has contracts to sell),  or in
lieu of any  thereof or in addition to any  thereto,  guarantees  and letters of
credit  supporting any such  obligations and  Indebtedness  (in each case, other
than for an obligation for borrowed money, other than borrowed money represented
by any such letter of credit, bid,  performance or surety bond, or reimbursement
obligation itself, or any guarantee and letter of credit related thereto).


                                     20
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            "Person"    means   an   individual,    partnership,    corporation,
unincorporated  organization,  limited liability company, trust, estate or joint
venture, or a governmental agency or political subdivision thereof.

            "Physical Notes" has the meaning provided in Section 2.01.

            "Plan of  Liquidation"  means,  with  respect to any Person,  a plan
(including  by  operation  of  law)  that  provides  for,  contemplates  or  the
effectuation   of  which  is  preceded  or   accompanied   by  (whether  or  not
substantially  contemporaneously)  (i) the  sale,  lease,  conveyance  or  other
disposition of all or  substantially  all of the assets of such Person otherwise
than as an entirety or substantially as an entirety and (ii) the distribution of
all or  substantially  all of the proceeds of such sale,  lease,  conveyance  or
other  disposition and all or substantially  all of the remaining assets of such
Person to holders of Capital Stock of such Person.

            "Preferred  Stock" of any  Person  means any  Capital  Stock of such
Person that has  preferential  rights to any other  Capital Stock of such Person
with respect to dividends or redemptions or upon liquidation.

            "principal"  of any  Indebtedness  (including  the Notes)  means the
principal  amount  of such  Indebtedness  plus  the  premium,  if  any,  on such
Indebtedness.

            "Private   Exchange   Notes"  has  the  meaning  set  forth  in  the
Registration Rights Agreement.

            "Private  Placement  Legend" means the legend initially set forth on
the Notes in the form set forth in Section 2.15.

            "pro forma" means,  with respect to any calculation made or required
to be made pursuant to the terms of this Indenture,  a calculation in accordance
with Article 11 of Regulation S-X under the Securities Act, as determined by the
Board of Directors of the Company in consultation  with its  independent  public
accountants.

            "Property" means, with respect to any Person,  any interests of such
Person in any kind of property or asset,  whether  real,  personal or mixed,  or
tangible  or  intangible,   including,   without   limitation,   Capital  Stock,
partnership  interests  and other  equity or  ownership  interests  in any other
Person.

            "Purchase Money Indebtedness" means Indebtedness the net proceeds of
which are used to  finance  the cost  (including  the cost of  construction)  of
property  or assets  acquired  in the normal  course of  business  by the Person
incurring such Indebtedness.

            "Qualified  Capital  Stock"  means  any  Capital  Stock  that is not
Disqualified Capital Stock.

                                     21
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            "Qualified  Institutional  Buyer" or "QIB"  shall  have the  meaning
specified in Rule 144A under the Securities Act.

            "Record Date" means the Record Dates specified in the Notes.

            "Redemption  Date,"  when  used  with  respect  to  any  Note  to be
redeemed,  means the date fixed for such  redemption  pursuant to this Indenture
and the Notes.

            "Redemption  Price,"  when  used  with  respect  to any  Note  to be
redeemed,  means the price fixed for such  redemption,  including  principal and
premium, if any, pursuant to this Indenture and the Notes.

            "Reference Date" has the meaning set forth in Section 4.10.

            "Refinance"  means, in respect of any security or  Indebtedness,  to
refinance,  extend, renew, refund, repay, prepay,  redeem, defease or retire, or
to issue a security  or  Indebtedness  in  exchange  or  replacement  for,  such
security or Indebtedness  in whole or in part;  "Refinanced"  and  "Refinancing"
shall have correlative meanings.

            "Refinancing  Indebtedness"  means any Refinancing by the Company or
any Restricted  Subsidiary of the Company of Indebtedness incurred in accordance
with Section 4.12 (other than  pursuant to clause (b),  (c), (d), (e), (f), (g),
(j), (k), (l), (n) or (o) of the definition of Permitted Indebtedness),  in each
case that does not (i) result in an increase in the aggregate  principal  amount
of Indebtedness of such Person as of the date of such proposed Refinancing (plus
the amount of any premium  required to be paid under the terms of the instrument
governing such Indebtedness and plus the amount of reasonable  expenses incurred
by  the  Company  and  its  Restricted  Subsidiaries  in  connection  with  such
Refinancing)  or (ii) create  Indebtedness  with (x) a Weighted  Average Life to
Maturity  that is less  than  the  Weighted  Average  Life  to  Maturity  of the
Indebtedness  being  Refinanced or (y) a final  maturity  earlier than the final
maturity of the Indebtedness being Refinanced;  provided,  however,  that (1) if
such  Indebtedness  being  Refinanced  is  Indebtedness  of  the  Company  or  a
Subsidiary Guarantor,  then such Refinancing  Indebtedness shall be Indebtedness
solely  of the  Company  and/or  such  Subsidiary  Guarantor  and  (2)  if  such
Indebtedness  being  Refinanced  is  subordinate  or  junior  to the  Notes or a
Guarantee,  then such Refinancing Indebtedness shall be subordinate to the Notes
or such  Guarantee,  as the case may be, at least to the same  extent and in the
same manner as the Indebtedness being Refinanced.

            "Registrar" has the meaning provided in Section 2.03.

            "Registration   Rights  Agreement"  means  the  Registration  Rights
Agreement dated the Issue Date among the Issuers, the Subsidiary  Guarantors and
the Initial Purchasers.

            "Regulation S" means Regulation S under the Securities Act.


                                     22
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            "Related  Person" of any Person means any other  Person  directly or
indirectly  owning 10% or more of the  outstanding  voting  Common Stock of such
Person (or, in the case of a Person  that is not a  corporation,  10% or more of
the equity interest in such Person).

            "Replacement  Assets"  shall have the  meaning  set forth in Section
4.16.

            "Restricted  Payment"  shall have the  meaning  set forth in Section
4.10.

            "Restricted  Security" has the meaning assigned to such term in Rule
144(a)(3) under the Securities Act; provided, however, that the Trustee shall be
entitled to request and conclusively  rely on an Opinion of Counsel with respect
to whether any Note constitutes a Restricted Security.

            "Restricted   Subsidiary"   means  any  Subsidiary  of  the  Company
(including,  without limitation,  Canadian Abraxas) that has not been designated
by the Board of Directors of the Company, by a Board Resolution delivered to the
Trustee,  as an  Unrestricted  Subsidiary  pursuant  to and in  compliance  with
Section 4.14. Any such  designation may be revoked by a Board  Resolution of the
Company delivered to the Trustee, subject to the provisions of such covenant.

            "Rule 144A" means Rule 144A under the Securities Act.

            "S&P" means  Standard & Poor's  Rating  Services,  a division of The
McGraw Hill Companies, Inc., and its successors.

            "Sale  and  Leaseback  Transaction"  means any  direct  or  indirect
arrangement with any Person or to which any such Person is a party providing for
the leasing to the Company or a Restricted  Subsidiary of any property,  whether
owned by the  Company or any  Restricted  Subsidiary  at the Issue Date or later
acquired,  which has been or is to be sold or transferred by the Company or such
Restricted Subsidiary to such Person or to any other Person from whom funds have
been or are to be advanced by such Person on the security of such property.

            "Securities  Act" means the Securities Act of 1933, as amended,  and
the rules and regulations of the Commission promulgated thereunder.

            "Subsidiary," with respect to any Person,  means (a) any corporation
of which the  outstanding  Capital Stock having at least a majority of the votes
entitled to be cast in the election of directors  under  ordinary  circumstances
shall at the time be owned,  directly or  indirectly,  by such Person or (b) any
other Person of which at least a majority of the voting  interest under ordinary
circumstances is at the time, directly or indirectly, owned by such Person.

            "Subsidiary  Guarantor"  means  each  of  the  Company's  Restricted
Subsidiaries that in the future executes a supplemental  indenture in which such
Restricted Subsidiary

                                     23
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agrees to be bound by the terms of this  Indenture  as a  Subsidiary  Guarantor;
provided,  however,  that any Person  constituting  a  Subsidiary  Guarantor  as
described  above shall  cease to  constitute  a  Subsidiary  Guarantor  when its
Guarantee is released in accordance with the terms of this Indenture.

            "Surviving Entity" shall have the meaning set forth in Section 5.01.

            "TIA"  means  the  Trust  Indenture  Act of 1939 (15  U.S.C.  ss.ss.
77aaa-77bbbb), as amended, as in effect on the date of this Indenture, except as
otherwise provided in Section 9.03.

            "Trust  Officer"  means any  officer  or  assistant  officer  of the
Trustee assigned by the Trustee to administer this Indenture,  or in the case of
a successor  trustee,  an officer assigned to the department,  division or group
performing  the  corporation  trust  work  of such  successor  and  assigned  to
administer this Indenture.

            "Trustee"  means the party named as such in this  Indenture  until a
successor  replaces it in accordance  with the  provisions of this Indenture and
thereafter means such successor.

            "U.S.  Government  Obligations"  mean  direct  obligations  of,  and
obligations guaranteed by, the United States of America for the payment of which
the full faith and credit of the United States of America is pledged.

            "U.S. Legal Tender" means such coin or currency of the United States
of America as at the time of payment  shall be legal  tender for the  payment of
public and private debts.

            "Unrestricted  Subsidiary"  means  any  Subsidiary  of  the  Company
designated as such pursuant to and in  compliance  with Section 4.14;  provided,
however,  that Unrestricted  Subsidiaries shall initially include Cascade,  Grey
Wolf and Western.  Any such  designation may be revoked by a Board Resolution of
the Company delivered to the Trustee,  subject to the provisions of such Section
4.14.

            "Weighted  Average  Life to  Maturity"  means,  when  applied to any
Indebtedness  at any date, the number of years obtained by dividing (a) the then
outstanding  aggregate principal amount of such Indebtedness into (b) the sum of
the total of the products  obtained by  multiplying  (i) the amount of each then
remaining  installment,  sinking fund, serial maturity or other required payment
of principal,  including payment at final maturity,  in respect thereof, by (ii)
the number of years  (calculated to the nearest  one-twelfth)  which will elapse
between such date and the making of such payment.

            "Western" means Western Associated Energy Corporation, a Texas
Corporation.

            "Wholly Owned Restricted Subsidiary" means any Restricted Subsidiary
of which all the outstanding voting securities normally entitled to vote in the

                                     24
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election  of  directors  are  owned  by the  Company  or  another  Wholly  Owned
Restricted Subsidiary.

            SECTION 1.02.  Incorporation by Reference of TIA.

            Whenever  this  Indenture  refers to a  provision  of the TIA,  such
provision is  incorporated  by reference in, and made a part of, this Indenture.
The following TIA terms used in this Indenture have the following meanings:

            "indenture securities" means the Notes.

            "indenture security holder" means a Holder.

            "indenture to be qualified" means this Indenture.

            "indenture trustee" or "institutional trustee" means the Trustee.

            "obligor" on the indenture securities means the Issuers or any other
obligor on the Notes.

            All other TIA terms used in this  Indenture  that are defined by the
TIA,  defined by TIA reference to another  statute or defined by Commission rule
and not otherwise defined herein have the meanings assigned to them therein.

            SECTION 1.03.  Rules of Construction.

            Unless the context otherwise requires:

            (1)   a term has the meaning assigned to it;

            (2) an  accounting  term  not  otherwise  defined  has  the  meaning
      assigned to it in accordance with GAAP of any date of determination;

            (3)   "or" is not exclusive;

            (4)  words in the  singular  include  the  plural,  and words in the
      plural include the singular;

            (5)  "herein,"  "hereof" and other words of similar  import refer to
      this  Indenture as a whole and not to any particular  Article,  Section or
      other subdivision; and

            (6)  any  reference  to a  statute,  law or  regulation  means  that
      statute,  law or regulation as amended and in effect from time to time and
      includes any successor statute, law or regulation; provided, however, that
      any  reference  to the  Bankruptcy  Law shall mean the  Bankruptcy  Law as
      applicable to the relevant case.

                                     25
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                                  ARTICLE TWO

                                   THE NOTES


            SECTION 2.01.  Form and Dating.

            The Initial Notes and the Trustee's  certificate  of  authentication
relating  thereto shall be  substantially  in the form of Exhibit A hereto.  The
Exchange Notes and the Trustee's certificate of authentication  relating thereto
shall be  substantially  in the form of  Exhibit  B  hereto.  The Notes may have
notations,  legends or  endorsements  required by law,  stock  exchange  rule or
depository rule or usage.  The Issuers and the Trustee shall approve the form of
the Notes and any notation,  legend or endorsement  on them.  Each Note shall be
dated the date of its  issuance  and shall show the date of its  authentication.
Each Note shall have an executed Guarantee endorsed thereon substantially in the
form of Exhibit E hereto.

            The terms and provisions  contained in the Notes,  annexed hereto as
Exhibits A and B, shall  constitute,  and are hereby  expressly  made, a part of
this Indenture and, to the extent  applicable,  the Issuers and the Trustee,  by
their  execution and delivery of this  Indenture,  expressly agree to such terms
and provisions and to be bound thereby.

            Notes  offered and sold in reliance on Rule 144A,  Notes offered and
sold to institutional "accredited investors" (as defined in Rule 501(a)(1), (2),
(3) or (7) under the  Securities  Act) and Notes offered and sold in reliance on
Regulation  S shall be  issued  initially  in the form of one or more  permanent
global Notes in registered form,  substantially in the form set forth in Exhibit
A (the  "Global  Note"),  deposited  with  the  Trustee,  as  custodian  for the
Depository,  duly  executed  by the Issuers  (and  having an executed  Guarantee
endorsed thereon) and  authenticated by the Trustee as hereinafter  provided and
shall bear the legend set forth in Section 2.15. The aggregate  principal amount
of the  Global  Note  may  from  time to  time  be  increased  or  decreased  by
adjustments made on the records of the Trustee, as custodian for the Depository,
as hereinafter provided.

            Notes issued in exchange for  interests in a Global Note pursuant to
Section  2.16 may be  issued  in the  form of  permanent  certificated  Notes in
registered form in substantially  the form set forth in Exhibit A (the "Physical
Notes").

            SECTION 2.02.  Execution and Authentication;
                              Aggregate Principal Amount.

            Two  Officers,  or an Officer  and an  Assistant  Secretary  of each
Issuer and each Subsidiary Guarantor,  shall sign, or one Officer shall sign and
one Officer or an Assistant  Secretary  (each of whom shall,  in each case, have
been duly  authorized by all requisite  corporate  actions) shall attest to, the
Notes for the Issuers and the Guarantees for the Subsidiary Guarantors by manual
or facsimile signature.

                                     26
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            If an Officer or Assistant Secretary whose signature is on a Note or
a Guarantee was an Officer or Assistant  Secretary at the time of such execution
but  no  longer   holds  that  office  or  position  at  the  time  the  Trustee
authenticates the Note, the Note shall nevertheless be valid.

            A Note  shall  not be valid  until an  authorized  signatory  of the
Trustee  manually  signs the  certificate  of  authentication  on the Note.  The
signature  shall be  conclusive  evidence  that the Note has been  authenticated
under this Indenture.

            The Trustee shall  authenticate (i) Initial Notes for original issue
in the aggregate  principal amount not to exceed  $200,000,000 and (ii) Exchange
Notes from time to time for issue only in exchange for a like  principal  amount
of Initial Notes or (iii) Private  Exchange  Notes,  in each case upon a written
order of the Issuers in the form of an  Officers'  Certificate  of each  Issuer.
Each such written  order shall  specify the amount of Notes to be  authenticated
and the date on which the Notes are to be  authenticated,  whether the Notes are
to be Initial Notes or Exchange  Notes and whether the Notes are to be issued as
Physical  Notes or Global  Notes or such other  information  as the  Trustee may
reasonably  request.  In addition,  with respect to  authentication  pursuant to
clauses (ii) or (iii) of the first  sentence of this  paragraph,  the first such
written order from the Issuers shall be  accompanied by an Opinion of Counsel of
each Issuer in a form  reasonably  satisfactory  to the Trustee stating that the
issuance of the Exchange Notes or Private  Exchange  Notes,  as the case may be,
does not give rise to an event of default,  complies with this Indenture and has
been duly  authorized by such Issuer.  The aggregate  principal  amount of Notes
outstanding  at any time may not  exceed  $215,000,000,  except as  provided  in
Sections 2.07 and 2.08.

            The Trustee may appoint an authenticating agent (the "Authenticating
Agent")  reasonably  acceptable  to the Issuers to  authenticate  Notes.  Unless
otherwise provided in the appointment,  an Authenticating Agent may authenticate
Notes  whenever  the Trustee  may do so. Each  reference  in this  Indenture  to
authentication  by the Trustee includes  authentication  by such  Authenticating
Agent. An Authenticating  Agent has the same rights as an Agent to deal with the
Issuers or with any Affiliate of the Issuers.

            The Notes shall be issuable in fully  registered form only,  without
coupons, in denominations of $1,000 and any integral multiple thereof.

                                     27
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            SECTION 2.03.  Registrar and Paying Agent.

            The  Issuers  shall  maintain  an office or agency  (which  shall be
located in the Borough of Manhattan in the City of New York,  State of New York)
where (a) Notes may be presented or surrendered for  registration of transfer or
for  exchange  ("Registrar"),  (b) Notes may be  presented  or  surrendered  for
payment  ("Paying  Agent") and (c) notices and demands to or upon the Issuers in
respect of the Notes and this Indenture may be served.  The Registrar shall keep
a register of the Notes and of their  transfer and exchange.  The Issuers,  upon
prior written notice to the Trustee,  may have one or more co-Registrars and one
or more additional paying agents reasonably  acceptable to the Trustee. The term
"Paying  Agent"  includes any  additional  Paying Agent.  The Issuers may act as
their own Paying  Agent,  except that for the  purposes of payments on the Notes
pursuant to Sections 4.15 and 4.16, neither the Issuers nor any Affiliate of the
Issuers may act as Paying Agent.

            The Issuers shall enter into an  appropriate  agency  agreement with
any Agent not a party to this Indenture,  which agreement shall  incorporate the
provisions of the TIA and implement the provisions of this Indenture that relate
to such Agent. The Issuers shall notify the Trustee, in advance, of the name and
address of any such Agent. If the Issuers fail to maintain a Registrar or Paying
Agent, or fail to give the foregoing notice, the Trustee shall act as such.

            The Issuers initially appoint the Trustee as Registrar, Paying Agent
and agent for service of demands and notices in connection with the Notes, until
such time as the Trustee has resigned or a successor has been appointed.  Any of
the  Registrar,  the Paying  Agent or any other  agent may resign  upon 30 days'
notice to the Issuers.

            SECTION 2.04.  Paying Agent To Hold Assets in Trust.

            The Issuers  shall  require each Paying Agent other than the Trustee
to agree in writing  that such Paying  Agent shall hold in trust for the benefit
of the  Holders  or the  Trustee  all assets  held by the  Paying  Agent for the
payment of principal  of,  premium,  if any, or interest on, the Notes  (whether
such assets have been  distributed  to it by the Issuers or any other obligor on
the Notes), and the Issuers and the Paying Agent shall notify the Trustee of any
Default by the  Issuers  (or any other  obligor on the Notes) in making any such
payment.  The Issuers at any time may require a Paying Agent to  distribute  all
assets held by it to the Trustee  and account for any assets  disbursed  and the
Trustee may at any time during the  continuance  of any  payment  Default,  upon
written  request to a Paying Agent,  require such Paying Agent to distribute all
assets held by it to the Trustee and to account for any assets distributed. Upon
distribution  to the Trustee of all assets that shall have been delivered by the
Issuers to the Paying  Agent,  the Paying Agent shall have no further  liability
for such assets.

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            SECTION 2.05.  Holder Lists.

            The Trustee  shall  preserve  in as current a form as is  reasonably
practicable  the most recent list  available to it of the names and addresses of
the Holders.  If the Trustee is not the Registrar,  the Issuers shall furnish or
cause the  Registrar  to furnish to the  Trustee  before each Record Date and at
such other  times as the  Trustee  may request in writing a list as of such date
and in such  form  as the  Trustee  may  reasonably  require  of the  names  and
addresses  of the  Holders,  which list may be  conclusively  relied upon by the
Trustee.

            SECTION 2.06.  Transfer and Exchange.

            When Notes are presented to the Registrar or a  co-Registrar  with a
request to register the transfer of such Notes or to exchange  such Notes for an
equal principal amount of Notes or other authorized denominations, the Registrar
or co-Registrar shall register the transfer or make the exchange as requested if
its requirements for such transaction are met; provided, however, that the Notes
presented or surrendered for  registration of transfer or exchange shall be duly
endorsed or accompanied by a written instrument of transfer in form satisfactory
to the Issuers, the Trustee and the Registrar or co-Registrar,  duly executed by
the  Holder  thereof or his  attorney  duly  authorized  in  writing.  To permit
registration  of transfers  and  exchanges,  the Issuers  shall  execute and the
Trustee shall  authenticate  Notes and the Subsidiary  Guarantors  shall execute
Guarantees  thereon at the  Registrar's or  co-Registrar's  request.  No service
charge  shall be made for any  registration  of  transfer or  exchange,  but the
Issuers may require  payment of a sum  sufficient to cover any transfer tax, fee
or similar  governmental charge payable in connection  therewith (other than any
such transfer  taxes or similar  governmental  charge  payable upon exchanges or
transfers  pursuant to Sections 2.10,  3.04,  4.15, 4.16 or 9.05, in which event
the Issuers shall be responsible for the payment of such taxes).

            The Registrar or co-Registrar  shall not be required to register the
transfer of or exchange of any Note (i) during a period beginning at the opening
of business 15 days  before the mailing of a notice of  redemption  of Notes and
ending at the close of business on the day of such mailing and (ii) selected for
redemption in whole or in part pursuant to Article Three,  except the unredeemed
portion of any Note being redeemed in part.

            Any Holder of a  beneficial  interest  in a Global  Note  shall,  by
acceptance of such Global Note, agree that transfers of beneficial  interests in
such Global Notes may be effected only through a book entry system maintained by
the  Holder  of such  Global  Note  (or its  agent),  and  that  ownership  of a
beneficial  interest  in the Note shall be required  to be  reflected  in a book
entry system.

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            SECTION 2.07.  Replacement Notes.

            If a mutilated  Note is  surrendered to the Trustee or if the Holder
of a Note claims that the Note has been lost, destroyed or wrongfully taken, the
Issuers shall issue and the Trustee shall  authenticate  a replacement  Note and
the  Subsidiary  Guarantors  shall execute a Guarantee  thereon if the Trustee's
requirements  are met. If required  by the Trustee or the  Issuers,  such Holder
must  provide  an  indemnity  bond  or  other  indemnity  of  reasonable  tenor,
sufficient in the reasonable judgment of the Issuers, the Subsidiary  Guarantors
and the Trustee, to protect the Issuers, the Subsidiary Guarantors,  the Trustee
or any Agent from any loss  which any of them may suffer if a Note is  replaced.
Every replacement Note shall constitute an additional  obligation of the Issuers
and the Subsidiary Guarantors.

            SECTION 2.08.  Outstanding Notes.

            Notes  outstanding  at any time are all the  Notes  that  have  been
authenticated  by the Trustee except those canceled by it, those delivered to it
for cancellation and those described in this Section as not outstanding. Subject
to the  provisions  of  Section  2.09,  a Note does not cease to be  outstanding
because an Issuer or any of its Affiliates holds the Note.

            If a Note  is  replaced  pursuant  to  Section  2.07  (other  than a
mutilated Note surrendered for replacement),  it ceases to be outstanding unless
the Trustee receives proof  satisfactory to it that the replaced Note is held by
a bona fide purchaser.  A mutilated Note ceases to be outstanding upon surrender
of such Note and replacement thereof pursuant to Section 2.07.

            If on a Redemption  Date or the Maturity Date the Paying Agent holds
U.S. Legal Tender or U.S.  Government  Obligations  sufficient to pay all of the
principal,  premium,  if any, and interest due on the Notes payable on that date
and is not prohibited from paying such money to the Holders thereof  pursuant to
the terms of this  Indenture,  then on and after that date such  Notes  shall be
deemed not to be outstanding and interest on them shall cease to accrue.

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            SECTION 2.09.  Treasury Notes.

            In determining  whether the Holders of the required principal amount
of Notes have concurred in any direction, waiver, consent or notice, Notes owned
by the Issuers or an Affiliate of the Issuers shall be considered as though they
are not  outstanding,  except that for the purposes of  determining  whether the
Trustee shall be protected in relying on any such direction,  waiver or consent,
only Notes  which a Trust  Officer of the  Trustee  actually  knows are so owned
shall be so considered.  The Issuers shall notify the Trustee, in writing,  when
either of them or, to their knowledge,  any of their  Affiliates  repurchases or
otherwise  acquires  Notes, of the aggregate  principal  amount of such Notes so
repurchased or otherwise  acquired and such other information as the Trustee may
reasonably request and the Trustee shall be entitled to rely thereon.

            SECTION 2.10.  Temporary Notes.

            Until  definitive  Notes are ready for  delivery,  the  Issuers  may
prepare and the Trustee  shall  authenticate  temporary  Notes upon receipt of a
written  order of the  Issuers  in the  form of an  Officers'  Certificate.  The
Officers'  Certificate  shall  specify  the  amount  of  temporary  Notes  to be
authenticated and the date on which the temporary Notes are to be authenticated.
Temporary Notes shall be  substantially  in the form of definitive Notes but may
have variations that the Issuers consider appropriate for temporary Notes and so
indicate in the Officers'  Certificate.  Without unreasonable delay, the Issuers
shall prepare,  the Trustee shall  authenticate  and the  Subsidiary  Guarantors
shall  execute  Guarantees  on, upon  receipt of a written  order of the Issuers
pursuant to Section 2.02, definitive Notes in exchange for temporary Notes.

            SECTION 2.11.  Cancellation.

            The  Issuers  at any  time may  deliver  Notes  to the  Trustee  for
cancellation.  The  Registrar  and the Paying Agent shall forward to the Trustee
any Notes surrendered to them for transfer, exchange or payment. The Trustee, or
at the direction of the Trustee,  the Registrar or the Paying Agent,  and no one
else, shall cancel and, at the written direction of the Issuers,  shall dispose,
in its  customary  manner,  of all Notes  surrendered  for  transfer,  exchange,
payment or cancellation.  Subject to Section 2.07, the Issuers may not issue new
Notes to  replace  Notes that they have paid or  delivered  to the  Trustee  for
cancellation.  If the Issuers shall acquire any of the Notes,  such  acquisition
shall  not  operate  as  a  redemption  or  satisfaction  of  the   Indebtedness
represented  by such  Notes  unless  and until the same are  surrendered  to the
Trustee for cancellation pursuant to this Section 2.11.

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            SECTION 2.12.  Defaulted Interest.

            The Issuers will pay interest on overdue principal from time to time
on demand at the rate of interest then borne by the Notes. The Issuers shall, to
the extent lawful,  pay interest on overdue  installments  of interest  (without
regard to any applicable  grace periods) from time to time on demand at the rate
of interest then borne by the Notes. Interest will be computed on the basis of a
360-day year  comprised of twelve 30-day  months,  and, in the case of a partial
month, the actual number of days elapsed.

            If the Issuers  default in a payment of interest on the Notes,  they
shall pay the  defaulted  interest,  plus (to the extent  lawful)  any  interest
payable  on the  defaulted  interest,  to  the  Persons  who  are  Holders  on a
subsequent special record date, which special record date shall be the fifteenth
day next  preceding  the date fixed by the Issuers for the payment of  defaulted
interest or the next succeeding Business Day if such date is not a Business Day.
The  Issuers  shall  notify the  Trustee  in writing of the amount of  defaulted
interest  proposed to be paid on each Note and the date of the proposed  payment
(a "Default  Interest  Payment  Date"),  and at the same time the Issuers  shall
deposit  with the  Trustee  an amount  of money  equal to the  aggregate  amount
proposed  to be paid in  respect  of  such  defaulted  interest  or  shall  make
arrangements  satisfactory  to the Trustee  for such  deposit on or prior to the
date of the proposed payment,  such money when deposited to be held in trust for
the benefit of the Persons  entitled to such  defaulted  interest as provided in
this  Section;  provided,  however,  that in no event shall the Issuers  deposit
monies  proposed to be paid in respect of  defaulted  interest  later than 11:00
a.m. New York City time of the proposed  Default Interest Payment Date. At least
15 days before the  subsequent  special  record date, the Issuers shall mail (or
cause to be mailed) to each Holder, as of a recent date selected by the Issuers,
with a copy to the Trustee,  a notice that states the subsequent  special record
date,  the  payment  date and the amount of  defaulted  interest,  and  interest
payable on such  defaulted  interest,  if any, to be paid.  Notwithstanding  the
foregoing,  any  interest  which is paid prior to the  expiration  of the 30-day
period set forth in Section  6.01(a)  shall be paid to Holders as of the regular
record date for the Interest  Payment Date for which interest has not been paid.
Notwithstanding  the  foregoing,  the Issuers may make payment of any  defaulted
interest in any other lawful manner not  inconsistent  with the  requirements of
any securities  exchange on which the Notes may be listed,  and upon such notice
as may be required by such exchange.

            SECTION 2.13. CUSIP Number.

            The Issuers in issuing the Notes may use a "CUSIP"  number,  and, if
so, the Trustee  shall use the CUSIP number in notices of redemption or exchange
as a convenience to Holders; provided, however, that no representation is hereby
deemed to be made by the Trustee as to the  correctness or accuracy of the CUSIP
number  printed in the notice or on the Notes,  and that  reliance may be placed
only on the other identification numbers printed on the Notes. The Issuers shall
promptly notify the Trustee of any change in the CUSIP number.

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            SECTION 2.14.  Deposit of Monies.

            Prior to 11:00  a.m.  New York  City time on each  Interest  Payment
Date,  Maturity Date,  Redemption  Date,  Change of Control Payment Date and Net
Proceeds  Offer Payment Date,  the Issuers shall have  deposited with the Paying
Agent in immediately  available funds money sufficient to make cash payments, if
any, due on such Interest Payment Date,  Maturity Date,  Redemption Date, Change
of Control Payment Date and Net Proceeds Offer Payment Date, as the case may be,
in a timely  manner  which  permits  the  Paying  Agent to remit  payment to the
Holders on such Interest Payment Date, Maturity Date, Redemption Date, Change of
Control Payment Date and Net Proceeds Offer Payment Date, as the case may be.

            SECTION 2.15.  Restrictive Legends.

            Each Global Note and  Physical  Note that  constitutes  a Restricted
Security shall bear the following legend (the "Private Placement Legend") on the
face thereof  until after the third  anniversary  of the later of the Issue Date
and the last date on which an Issuer or any  Affiliate of either  Issuer was the
owner of such Note (or any predecessor security) (or such shorter period of time
as permitted by Rule 144(k) under the Securities Act or any successor  provision
thereunder)  (or  such  longer  period  of time  as may be  required  under  the
Securities Act or applicable state securities laws in the opinion of counsel for
the Issuers, unless otherwise agreed by the Issuers and the Holder thereof):

      THIS SECURITY HAS NOT BEEN  REGISTERED  UNDER THE U.S.  SECURITIES  ACT OF
      1933, AS AMENDED (THE  "SECURITIES  ACT"),  AND,  ACCORDINGLY,  MAY NOT BE
      OFFERED  OR SOLD  WITHIN THE  UNITED  STATES OR TO, OR FOR THE  ACCOUNT OR
      BENEFIT OF, U.S.  PERSONS  EXCEPT AS SET FORTH BELOW.  BY ITS  ACQUISITION
      HEREOF,   THE  HOLDER  (1)   REPRESENTS   THAT  (A)  IT  IS  A  "QUALIFIED
      INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR
      (B) IT IS AN  "ACCREDITED  INVESTOR" (AS DEFINED IN RULE  501(a)(1),  (2),
      (3), OR (7) UNDER THE SECURITIES  ACT), (AN "ACCREDITED  INVESTOR") OR (C)
      IT IS NOT A U.S.  PERSON AND IS  ACQUIRING  THIS  SECURITY  IN AN OFFSHORE
      TRANSACTION  IN  COMPLIANCE  WITH RULE 904 UNDER THE  SECURITIES  ACT, (2)
      AGREES THAT IT WILL NOT WITHIN THREE YEARS AFTER THE ORIGINAL  ISSUANCE OF
      THIS SECURITY RESELL OR OTHERWISE TRANSFER THIS SECURITY EXCEPT (A) TO THE
      ISSUERS THEREOF OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES TO
      A QUALIFIED  INSTITUTIONAL  BUYER IN  COMPLIANCE  WITH RULE 144A UNDER THE
      SECURITIES  ACT, (C) INSIDE THE UNITED  STATES TO AN  ACCREDITED  INVESTOR
      THAT, PRIOR TO SUCH TRANSFER, FURNISHES (OR HAS FURNISHED ON ITS BEHALF BY
      A U.S.  BROKER-DEALER) TO THE TRUSTEE A SIGNED LETTER  CONTAINING  CERTAIN
      REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF
      
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      THIS  SECURITY  (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE
      FOR  THIS  SECURITY),  (D)  OUTSIDE  THE  UNITED  STATES  IN  AN  OFFSHORE
      TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT (PROVIDED
      THAT ANY SUCH SALE OR  TRANSFER  IN CANADA OR TO OR FOR THE  BENEFIT  OF A
      CANADIAN  RESIDENT  MUST BE  EFFECTED  PURSUANT TO AN  EXEMPTION  FROM THE
      PROSPECTUS  AND  REGISTRATION   REQUIREMENTS  UNDER  APPLICABLE   CANADIAN
      SECURITIES LAWS), (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED
      BY RULE 144 UNDER THE SECURITIES ACT (IF AVAILABLE), OR (F) PURSUANT TO AN
      EFFECTIVE  REGISTRATION  STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES
      THAT IT WILL GIVE TO EACH PERSON TO WHOM THIS  SECURITY IS  TRANSFERRED  A
      NOTICE  SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY
      TRANSFER OF THIS SECURITY  WITHIN THREE YEARS AFTER THE ORIGINAL  ISSUANCE
      OF THIS SECURITY,  IF THE PROPOSED  TRANSFEREE IS AN ACCREDITED  INVESTOR,
      THE HOLDER MUST,  PRIOR TO SUCH  TRANSFER,  FURNISH TO THE TRUSTEE AND THE
      ISSUERS SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER
      OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE
      PURSUANT TO AN EXEMPTION  FROM,  OR IN A  TRANSACTION  NOT SUBJECT TO, THE
      REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS
      "OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANING
      GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

            Each  Global Note shall also bear the  following  legend on the face
thereof:

      UNLESS AND UNTIL IT IS  EXCHANGED  IN WHOLE OR IN PART FOR  SECURITIES  IN
      DEFINITIVE FORM, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY
      THE DEPOSITORY TO A NOMINEE OF THE  DEPOSITORY,  OR BY ANY SUCH NOMINEE OF
      THE  DEPOSITORY,  OR BY  THE  DEPOSITORY  OR  NOMINEE  OF  SUCH  SUCCESSOR
      DEPOSITORY  OR ANY SUCH NOMINEE TO A SUCCESSOR  DEPOSITORY OR A NOMINEE OF
      SUCH  SUCCESSOR  DEPOSITORY.  UNLESS THIS  CERTIFICATE  IS PRESENTED BY AN
      AUTHORIZED  REPRESENTATIVE  OF THE DEPOSITORY  TRUST  COMPANY,  A NEW YORK
      CORPORATION  ("DTC"),  TO AN  ISSUER  OR ITS  AGENT  FOR  REGISTRATION  OF
      TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN
      THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED
      REPRESENTATIVE  OF DTC (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO
      SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC),
      ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
      

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      ANY PERSON IS WRONGFUL  INASMUCH AS THE  REGISTERED  OWNER HEREOF,  CEDE &
      CO., HAS AN INTEREST HEREIN.

      TRANSFERS OF THIS GLOBAL  SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE,
      BUT NOT IN PART,  TO NOMINEES  OF CEDE & CO. OR TO A SUCCESSOR  THEREOF OR
      SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL SECURITY
      SHALL BE LIMITED TO TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET
      FORTH IN SECTION 2.17 OF THE INDENTURE.

            SECTION 2.16.  Book-Entry Provisions
                              for Global Security.

            (a) The Global Notes  initially  shall (i) be registered in the name
of the  Depository or the nominee of such  Depository,  (ii) be delivered to the
Trustee as custodian for such  Depository and (iii) bear legends as set forth in
Section 2.15.

            Members of, or  participants  in, the Depository  ("Agent  Members")
shall have no rights under this  Indenture  with respect to any Global Note held
on their behalf by the Depository, or the Trustee as its custodian, or under the
Global Notes, and the Depository may be treated by the Issuers,  the Trustee and
any Agent of the  Issuers or the  Trustee as the  absolute  owner of such Global
Note for all purposes whatsoever.  Notwithstanding the foregoing, nothing herein
shall  prevent  the  Issuers,  the  Trustee  or any Agent of the  Issuers or the
Trustee  from  giving  effect  to any  written  certification,  proxy  or  other
authorization  furnished by the Depository or impair,  as between the Depository
and its Agent  Members,  the  operation of  customary  practices  governing  the
exercise of the rights of a Holder of any Note.

            (b)  Transfers  of a Global  Note shall be limited to  transfers  in
whole,  but not in part, to the Depository,  its successors or their  respective
nominees.  Interests of beneficial owners in a Global Note may be transferred or
exchanged for Physical Notes in accordance  with the rules and procedures of the
Depository and the provisions of Section 2.17. In addition, Physical Notes shall
be  transferred  to all  beneficial  owners in  exchange  for  their  beneficial
interests in a Global Note if (i) the Depository notifies the Issuers that it is
unwilling  or  unable to  continue  as  Depository  for the  Global  Notes and a
successor  depositary  is not  appointed  by the Issuers  within 90 days of such
notice  or (ii) an Event of  Default  has  occurred  and is  continuing  and the
Registrar has received a written  request from the  Depository to issue Physical
Notes.

(c) In connection  with any transfer or exchange of a portion of the  beneficial
interest in a Global Note to beneficial  owners  pursuant to paragraph  (b), the
Registrar  shall (if one or more Physical Notes are to be issued) reflect on its
books and records the date and a decrease in the principal amount of such Global
Note in an amount equal to the principal  amount of the  beneficial  interest in

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<PAGE>




the Global Note to be transferred, and the Issuers shall execute, the Subsidiary
Guarantors shall execute  Guarantees on, and the Trustee shall  authenticate and
deliver, one or more Physical Notes of like tenor and amount.

            (d) In  connection  with the  transfer  of an entire  Global Note to
beneficial owners pursuant to paragraph (b), such Global Note shall be deemed to
be surrendered to the Trustee for  cancellation,  and the Issuers shall execute,
the  Subsidiary  Guarantors  shall  execute  Guarantees on and the Trustee shall
authenticate and deliver,  to each beneficial owner identified by the Depository
in exchange for its beneficial  interest in the Global Note, an equal  aggregate
principal amount of Physical Notes of authorized denominations.

            (e) Any Physical Note constituting a Restricted  Security  delivered
in exchange for an interest in a Global Note  pursuant to  paragraph  (b) or (c)
shall,  except as otherwise provided by paragraphs  (a)(i)(x) and (c) of Section
2.17, bear the legend regarding transfer restrictions applicable to the Physical
Notes set forth in Section 2.15.

            (f) The  Holder of a Global  Note may grant  proxies  and  otherwise
authorize  any  Person,  including  Agent  Members  and  Persons  that  may hold
interests  through Agent Members,  to take any action which a Holder is entitled
to take under this Indenture or the Notes.

            SECTION 2.17.  Special Transfer Provisions.

            (a)  Transfers to Non-QIB  Institutional  Accredited  Investors  and
      Non-U.S. Persons. The following provisions shall apply with respect to the
      registration of any proposed  transfer of a Note constituting a Restricted
      Security to any Institutional Accredited Investor which is not a QIB or to
      any Non-U.S. Person:

             (i)  the  Registrar   shall  register  the  transfer  of  any  Note
      constituting  a  Restricted  Security,  whether or not such Note bears the
      Private Placement Legend, if (x) the requested transfer is after the third
      anniversary of the Issue Date (provided, however, that neither the Company
      nor any Affiliate of the Company has held any beneficial  interest in such
      Note, or portion thereof, at any time on or prior to the third anniversary
      of  the  Issue  Date)  or  (y)  (1)  in  the  case  of a  transfer  to  an
      Institutional  Accredited  Investor which is not a QIB (excluding Non-U.S.
      Persons),  the  proposed  transferee  has  delivered  to the  Registrar  a
      certificate  substantially  in the form of  Exhibit C hereto or (2) in the
      case of a transfer  to a Non-U.S.  Person,  the  proposed  transferor  has
      delivered  to the  Registrar a  certificate  substantially  in the form of
      Exhibit D hereto; and

            (ii)  if the  proposed  transferor  is an  Agent  Member  holding  a
      beneficial  interest in the Global Note,  upon receipt by the Registrar of
      (x) the  certificate,  if any,  required  by  paragraph  (i) above and (y)
      written  instructions  given in accordance with the  Depository's  and the
      Registrar's procedures, whereupon

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            (a) the  Registrar  shall  reflect on its books and records the date
      and (if the transfer does not involve a transfer of  outstanding  Physical
      Notes) a decrease in the principal amount of such Global Note in an amount
      equal to the  principal  amount of the  beneficial  interest in the Global
      Note to be transferred,  and (b) the Issuers shall execute, the Subsidiary
      Guarantors   shall  execute  the  Guarantees  on  and  the  Trustee  shall
      authenticate  and  deliver  one or more  Physical  Notes of like tenor and
      amount.

            (b)  Transfers to QIBs.  The following  provisions  shall apply with
      respect  to  the   registration  of  any  proposed   transfer  of  a  Note
      constituting  a  Restricted  Security  to a QIB  (excluding  transfers  to
      Non-U.S. Persons):

             (i) the Registrar  shall  register the transfer if such transfer is
      being made by a proposed  transferor  who has checked the box provided for
      on the form of Note stating,  or has otherwise advised the Issuers and the
      Registrar in writing,  that the sale has been made in compliance  with the
      provisions of Rule 144A to a transferee  who has signed the  certification
      provided for on the form of Note  stating,  or has  otherwise  advised the
      Issuers and the Registrar in writing,  that it is purchasing  the Note for
      its own  account or an account  with  respect to which it  exercises  sole
      investment discretion and that it and any such account is a QIB within the
      meaning  of Rule  144A,  and is aware that the sale to it is being made in
      reliance  on  Rule  144A  and  acknowledges  that  it  has  received  such
      information  regarding  the Issuers as it has  requested  pursuant to Rule
      144A or has  determined  not to request  such  information  and that it is
      aware that the transferor is relying upon its foregoing representations in
      order to claim the exemption from registration provided by Rule 144A; and

            (ii) if the proposed transferee is an Agent Member, and the Notes to
      be  transferred  consist of Physical  Notes which after transfer are to be
      evidenced by an interest in a Global Note,  upon receipt by the  Registrar
      of written  instructions given in accordance with the Depository's and the
      Registrar's  procedures,  the  Registrar  shall  reflect  on its books and
      records the date and an increase  in the  principal  amount of such Global
      Note in an amount equal to the principal  amount of the Physical  Notes to
      be  transferred,  and the  Trustee  shall  cancel  the  Physical  Notes so
      transferred.

            (c)  Private  Placement  Legend.  Upon  the  transfer,  exchange  or
replacement  of Notes not bearing the Private  Placement  Legend,  the Registrar
shall  deliver  Notes that do not bear the Private  Placement  Legend.  Upon the
transfer, exchange or replacement of Notes bearing the Private Placement Legend,
the Registrar  shall deliver only Notes that bear the Private  Placement  Legend
unless (i) the requested  transfer is after the third  anniversary  of the Issue
Date  (provided,  however,  that neither Issuer nor any Affiliate of the Issuers
has held any beneficial  interest in such Note, or portion thereof,  at any time
prior to or on the  third  anniversary  of the  Issue  Date),  or (ii)  there is
delivered to the Registrar an Opinion of Counsel reasonably  satisfactory to the
Issuers and the Trustee to the effect that  neither  such legend nor the related
restrictions  on transfer are required in order to maintain  compliance with the
provisions of the Securities Act.

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            (d)  General.  By its  acceptance  of any Note  bearing  the Private
Placement  Legend,  each Holder of such a Note  acknowledges the restrictions on
transfer of such Note set forth in this  Indenture and in the Private  Placement
Legend and  agrees  that it will  transfer  such Note only as  provided  in this
Indenture.

            The Registrar shall retain copies of all letters,  notices and other
written  communications  received pursuant to Section 2.16 or this Section 2.17.
The Issuers shall have the right to inspect and make copies of all such letters,
notices  or other  written  communications  at any  reasonable  time  during the
Registrar's  normal business hours upon the giving of reasonable  written notice
to the Registrar.

            (e)  Transfers  of Notes Held by  Affiliates.  Any  certificate  (i)
evidencing a Note that has been  transferred to an Affiliate of an Issuer within
three years after the Issue Date,  as evidenced by a notation on the  Assignment
Form for such  transfer or in the  representation  letter  delivered  in respect
thereof  or (ii)  evidencing  a Note that has been  acquired  from an  Affiliate
(other than by an  Affiliate) in a transaction  or a chain of  transactions  not
involving any public offering,  shall,  until three years after the last date on
which either Issuer or any Affiliate of either Issuer was an owner of such Note,
in each case, bear a legend in substantially  the form set forth in Section 2.15
hereof,  unless  otherwise agreed by the Issuers (with written notice thereof to
the Trustee).

            SECTION 2.18.  Liquidated Damages Under
                              Registration Rights Agreement.

            Under certain  circumstances,  the Issuers shall be obligated to pay
certain liquidated damages to the Holders,  all as set forth in Section 4 of the
Registration Rights Agreement.  The terms thereof are hereby incorporated herein
by reference.


                                 ARTICLE THREE

                                  REDEMPTION


            SECTION 3.01.  Notices to Trustee.

            If the Company elects to redeem Notes pursuant to Paragraph 6 of the
Notes,  it shall  notify  the  Trustee  and the  Paying  Agent in writing of the
Redemption Date and the principal amount of the Notes to be redeemed.

            The Company shall give each notice provided for in this Section 3.01
60 days before the  Redemption  Date  (unless a shorter  notice  period shall be
satisfactory  to the Trustee,  as evidenced in a writing signed on behalf of the
Trustee),  together with an Officers'  Certificate  stating that such redemption
shall comply with the conditions contained herein and in the Notes.

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            SECTION 3.02.  Selection of Notes To Be Redeemed.

            In the event that less than all of the Notes are to be  redeemed  at
any time,  selection of such Notes, or portions thereof,  for redemption will be
made by the  Trustee  in  compliance  with  the  requirements  of the  principal
national securities  exchange,  if any, on which the Notes are listed or, if the
Notes  are not then  listed on a  national  securities  exchange,  on a pro rata
basis,  by lot or by such  other  method  as the  Trustee  shall  deem  fair and
appropriate; provided, however, that no Notes of a principal amount of $1,000 or
less  shall be  redeemed  in part;  and  provided,  further,  that if a  partial
redemption  is made with the  proceeds of an Equity  Offering,  selection of the
Notes or portions  thereof for redemption shall be made by the Trustee only on a
pro rata basis or on as nearly a pro rata basis as is  practicable  (subject  to
the procedures of DTC),  unless such method is otherwise  prohibited.  Notice of
redemption  shall be mailed by first-class mail at least 30 but not more than 60
days  before the  Redemption  Date to each Holder of Notes to be redeemed at its
registered  address.  If any Note is to be redeemed in part only,  the notice of
redemption  that  relates to such Note shall state the portion of the  principal
amount  thereof to be  redeemed.  A new Note in a principal  amount equal to the
unredeemed portion thereof will be issued in the name of the Holder thereof upon
cancellation of the original Note. On and after the applicable  Redemption Date,
interest will cease to accrue on Notes or portions thereof called for redemption
as long as the Issuers have  deposited with the Paying Agent for the Notes funds
in satisfaction of the applicable Redemption Price.

            SECTION 3.03.  Optional Redemption.

            The Notes will be redeemable,  at the Issuers'  option,  in whole at
any time or in part from time to time, on and after  November 1, 2000,  upon not
less than 30 nor more than 60 days' notice,  at the following  Redemption Prices
(expressed as percentages of the principal  amount  thereof) if redeemed  during
the twelve-month  period  commencing on November 1 of the years set forth below,
plus, in each case, accrued and unpaid interest,  if any, thereon to the date of
redemption:

            Year                                      Percentage

            2000............................          105.750%
            2001............................          102.875%
            2002 and thereafter....                   100.000%

            At any time, or from time to time, on or prior to __________,  1999,
the Issuers may, at their option,  use all or a portion of the net cash proceeds
of one or more Equity  Offerings  (as defined  below) to redeem up to 35% of the
aggregate  principal amount of the Notes originally issued at a Redemption Price
equal to 111.5% of the aggregate  principal  amount of the Notes to be redeemed,
plus accrued and unpaid  interest,  if any,  thereon to the date of  redemption;
provided,  however,  that at least $139.75 million aggregate principal amount of
Notes remains outstanding immediately after giving effect to any such redemption
(it being expressly agreed that for purposes of determining whether this

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condition is satisfied,  Notes owned by either Issuer or any of their Affiliates
shall  be  deemed  not to be  outstanding).  In order to  effect  the  foregoing
redemption with the proceeds of any Equity Offering, the Issuers shall make such
redemption  not more than 60 days  after  the  consummation  of any such  Equity
Offering.

            SECTION 3.04.  Notice of Redemption.

            At least 30 days but not more than 60 days before a Redemption Date,
the  Issuers  shall mail or cause to be mailed a notice of  redemption  by first
class mail to each  Holder of Notes to be redeemed  at its  registered  address,
with a copy to the Trustee and any Paying Agent.  At the Issuers'  request,  the
Trustee  shall give the notice of  redemption  in the  Issuers'  name and at the
Company's expense.  The Issuers' shall provide such notices of redemption to the
Trustee at least five days before the intended mailing date.

            Each  notice  of  redemption  shall  identify  (including  the CUSIP
number) the Notes to be redeemed and shall state:

            (1)   the Redemption Date;

            (2) the Redemption Price and the amount of accrued interest, if any,
      to be paid;

            (3)   the name and address of the Paying Agent;

            (4) the  subparagraph of the Notes pursuant to which such redemption
      is being made;

            (5) that Notes  called for  redemption  must be  surrendered  to the
      Paying Agent to collect the  Redemption  Price plus accrued  interest,  if
      any;

            (6) that,  unless  the  Issuers  default  in making  the  redemption
      payment,  interest  on Notes or  applicable  portions  thereof  called for
      redemption ceases to accrue on and after the Redemption Date, and the only
      remaining  right of the Holders of such Notes is to receive payment of the
      Redemption  Price plus accrued interest as of the Redemption Date, if any,
      upon surrender to the Paying Agent of the Notes redeemed;

            (7) if any  Note is  being  redeemed  in part,  the  portion  of the
      principal  amount  of  such  Note  to be  redeemed  and  that,  after  the
      Redemption  Date,  and upon surrender of such Note, a new Note or Notes in
      the aggregate  principal  amount equal to the unredeemed  portion  thereof
      will be issued; and

            (8)  if  fewer  than  all  the  Notes  are  to  be   redeemed,   the
      identification  of  the  particular  Notes  (or  portion  thereof)  to  be
      redeemed,  as  well as the  aggregate  principal  amount  of  Notes  to be
      redeemed and the  aggregate  principal  amount of Notes to be  outstanding
      after such partial redemption.

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            The Issuers  will comply with the  requirements  of Rule 14e-1 under
the Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and  regulations are applicable in connection with the purchase
of Notes.

            SECTION 3.05.  Effect of Notice of Redemption.

            Once notice of redemption is mailed in accordance with Section 3.04,
such notice of redemption  shall be irrevocable  and Notes called for redemption
become due and payable on the Redemption  Date and at the Redemption  Price plus
accrued  interest  as of such date,  if any.  Upon  surrender  to the Trustee or
Paying Agent,  such Notes called for redemption  shall be paid at the Redemption
Price plus accrued  interest thereon to the Redemption Date, but installments of
interest,  the maturity of which is on or prior to the Redemption Date, shall be
payable to Holders of record at the close of  business  on the  relevant  record
dates referred to in the Notes. Interest shall accrue on or after the Redemption
Date and  shall  be  payable  only if the  Issuers  default  in  payment  of the
Redemption Price.

            SECTION 3.06.  Deposit of Redemption Price.

            On or before the  Redemption  Date and in  accordance  with  Section
2.14,  the  Issuers  shall  deposit  with the  Paying  Agent U.S.  Legal  Tender
sufficient to pay the  Redemption  Price plus accrued  interest,  if any, of all
Notes to be redeemed on that date. The Paying Agent shall promptly return to the
Company  any U.S.  Legal  Tender so  deposited  which is not  required  for that
purpose,  except  with  respect to monies  owed as  obligations  to the  Trustee
pursuant to Article Seven.

            Unless the Issuers fail to comply with the  preceding  paragraph and
default in the payment of such Redemption Price plus accrued  interest,  if any,
interest  on the  Notes to be  redeemed  will  cease to  accrue on and after the
applicable Redemption Date, whether or not such Notes are presented for payment.

            SECTION 3.07.  Notes Redeemed in Part.

            Upon surrender of a Note that is to be redeemed in part, the Trustee
shall  authenticate for the Holder a new Note or Notes equal in principal amount
to the unredeemed portion of the Note surrendered.



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                                 ARTICLE FOUR

                                   COVENANTS


            SECTION 4.01.  Payment of Notes.

            (a) The Issuers  shall pay the principal  of,  premium,  if any, and
interest  on the Notes on the dates and in the manner  provided in the Notes and
in this Indenture.

            (b) An installment of principal of or interest on the Notes shall be
considered paid on the date it is due if the Trustee or Paying Agent (other than
an Issuer or any of its  Affiliates)  holds,  prior to 11:00 a.m.  New York City
time on that date,  U.S.  Legal Tender  designated for and sufficient to pay the
installment in full and is not prohibited  from paying such money to the Holders
pursuant to the terms of this Indenture or the Notes.

            (c)  Notwithstanding  anything  to the  contrary  contained  in this
Indenture,  the Issuers  may,  to the extent they are  required to do so by law,
deduct or withhold income or other similar taxes imposed by the United States of
America from principal or interest payments hereunder.

            SECTION 4.02.  Maintenance of Office or Agency.

            The  Issuers  shall  maintain  the office or agency  required  under
Section 2.03.  The Issuers shall give prior written notice to the Trustee of the
location,  and any change in the location,  of such office or agency.  If at any
time the Issuers  shall fail to maintain any such  required  office or agency or
shall fail to furnish the Trustee with the address thereof,  such presentations,
surrenders,  notices  and  demands  may be made or served at the  address of the
Trustee set forth in Section 10.02.

            SECTION 4.03.  Corporate Existence.

            Except as otherwise  permitted by Article Five, the Issuers shall do
or cause to be done,  at their own cost and  expense,  all things  necessary  to
preserve and keep in full force and effect their respective  corporate existence
and the  corporate  existence  of  each  of  their  Restricted  Subsidiaries  in
accordance with the respective  organizational documents of each such Restricted
Subsidiary and the material rights (charter and statutory) and franchises of the
Issuers and each such Restricted Subsidiary; provided, however, that the Issuers
shall not be required to  preserve,  with  respect to  themselves,  any material
right or franchise  and, with respect to any of their  Restricted  Subsidiaries,
any such  existence,  material right or franchise,  if the Board of Directors of
the Company shall  determine in good faith that the  preservation  thereof is no
longer  desirable  in the  conduct  of the  business  of the  Issuers  and their
Subsidiaries, taken as a whole.

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            SECTION 4.04.  Payment of Taxes and Other Claims.

            The  Issuers  shall  pay  or  discharge  or  cause  to  be  paid  or
discharged,  before the same shall become  delinquent,  (i) all material  taxes,
assessments  and  governmental  charges  (including  withholding  taxes  and any
penalties,  interest and  additions  to taxes)  levied or imposed upon either of
them or any of their  Subsidiaries  or  properties  of  either of them or any of
their Subsidiaries and (ii) all material lawful claims for labor,  materials and
supplies  that,  if unpaid,  might by law become a Lien upon the property of the
Issuers or any of their Subsidiaries;  provided, however, that the Issuers shall
not be required to pay or discharge or cause to be paid or  discharged  any such
tax,  assessment,  charge or claim whose  amount,  applicability  or validity is
being  contested  in good  faith  by  appropriate  negotiations  or  proceedings
properly instituted and diligently conducted for which adequate reserves, to the
extent required under GAAP, have been taken.

            SECTION 4.05.     Maintenance of Properties
                              and Insurance.

            (a) Each  Issuer  shall,  and  shall  cause  each of the  Restricted
Subsidiaries  to,  maintain all properties  used or useful in the conduct of its
business in good working order and condition (subject to ordinary wear and tear)
and make all necessary repairs, renewals,  replacements,  additions, betterments
and  improvements  thereto  and  actively  conduct  and  carry on its  business;
provided,  however, that nothing in this Section 4.05 shall prevent an Issuer or
any  of  the  Restricted  Subsidiaries  from  discontinuing  the  operation  and
maintenance  of any of its  properties,  if  such  discontinuance  is (i) in the
ordinary course of business pursuant to customary  business terms or (ii) in the
good faith  judgment of the  respective  Boards of Directors or other  governing
body of such Issuer or Restricted  Subsidiary,  as the case may be, desirable in
the conduct of their  respective  businesses and is not  disadvantageous  in any
material respect to the Holders.

            (b)  The  Issuers  shall  provide  or  cause  to  be  provided,  for
themselves  and  each  of  the  Restricted  Subsidiaries,  insurance  (including
appropriate  self-insurance)  against  loss or damage of the kinds that,  in the
good faith judgment of the Company, are adequate and appropriate for the conduct
of the  business  of the Company and its  Restricted  Subsidiaries  in a prudent
manner,  with reputable  insurers or with the government of the United States of
America,  Canada or an agency or instrumentality  thereof, in such amounts, with
such deductibles,  and by such methods as shall be customary,  in the good faith
judgment of the Company, for companies similarly situated in the industry.

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            SECTION 4.06.     Compliance Certificate;
                              Notice of Default.

            (a) The Issuers shall deliver to the Trustee,  within 105 days after
the end of their  respective  fiscal  quarters  and fiscal  years,  an Officers'
Certificate  of  each  of  the  Issuers  (provided,  however,  that  one  of the
signatories to each such Officers'  Certificate shall be the respective Issuer's
principal executive officer, principal financial officer or principal accounting
officer), as to such Officers' knowledge, without independent investigation,  of
such Issuer's  compliance with all conditions and covenants under this Indenture
(without  regard  to any  period  of grace or  requirement  of  notice  provided
hereunder)  and in the event any Default of the Issuers  exists,  such  Officers
shall specify the nature of such Default.  Each such Officers' Certificate shall
also notify the Trustee  should such Issuer  elect to change the manner in which
it fixes its fiscal year end.

            (b) So long as not contrary to the then current  recommendations  of
the American  Institute of Certified  Public  Accountants,  the annual financial
statements  delivered pursuant to Section 4.08 shall be accompanied by a written
report of the Company's independent certified public accountants (who shall be a
firm  of  established   national   reputation)  stating  (A)  that  their  audit
examination has included a review of the terms of this Indenture and the form of
the Notes as they relate to accounting  matters,  and (B) whether, in connection
with their audit examination,  any Default or Event of Default has come to their
attention and if such a Default or Event of Default has come to their attention,
specifying the nature and period of existence thereof; provided,  however, that,
without  any  restriction  as to  the  scope  of  the  audit  examination,  such
independent  certified public  accountants  shall not be liable by reason of any
failure to obtain  knowledge  of any such Default or Event of Default that would
not be disclosed in the course of an audit  examination  conducted in accordance
with generally accepted auditing standards.

            (c) (i) If any  Default  or Event of  Default  has  occurred  and is
continuing  or (ii) if any Holder  seeks to exercise any remedy  hereunder  with
respect to a claimed  Default  under this  Indenture  or the Notes,  the Company
shall deliver to the Trustee,  at its address set forth in Section 10.02 hereof,
by registered or certified  mail or by facsimile  transmission  followed by hard
copy by registered or certified mail an Officers'  Certificate  specifying  such
event,  notice  or other  action  within 10 days of its  becoming  aware of such
occurrence.

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            SECTION 4.07.  Compliance with Laws.

            The Issuers shall comply, and shall cause each of their Subsidiaries
to  comply,  with  all  applicable  statutes,  rules,  regulations,  orders  and
restrictions  of the United  States of  America,  all states and  municipalities
thereof,  and of any  governmental  department,  commission,  board,  regulatory
authority,  bureau,  agency and instrumentality of the foregoing,  in respect of
the conduct of their respective businesses and the ownership of their respective
properties,  except  for such  noncompliances  as  could  not  singly  or in the
aggregate  reasonably  be  expected  to have a  material  adverse  effect on the
financial condition, business, prospects or results of operations of the Company
and its Subsidiaries taken as a whole.

            SECTION 4.08.  Reports to Holders.

            The Company will deliver to the Trustee  within 15 days after filing
the same with the Commission,  copies of the quarterly and annual reports and of
the  information,  documents  and other  reports,  if any,  which the Company is
required  to file with the  Commission  pursuant  to  Section 13 or 15(d) of the
Exchange  Act.  Notwithstanding  that  the  Company  may not be  subject  to the
reporting  requirements  of Section 13 or 15(d) of the Exchange Act, the Company
will file with the Commission,  to the extent permitted, and provide the Trustee
and Holders with such annual reports and such  information,  documents and other
reports specified in Sections 13 and 15(d) of the Exchange Act. The Company will
also comply with the other provisions of Section 314(a) of the TIA.

            SECTION 4.09.     Waiver of Stay, Extension
                              or Usury Laws.

            The Issuers  covenant  (to the extent that they may  lawfully do so)
that they will not at any time insist upon,  plead, or in any manner  whatsoever
claim or take the  benefit or  advantage  of, any stay or  extension  law or any
usury law or other law that would  prohibit or forgive  the Issuers  from paying
all or any portion of the principal of or interest on the Notes as  contemplated
herein,  wherever  enacted,  now or at any time hereafter in force, or which may
affect the covenants or the  performance of this  Indenture;  and (to the extent
that they may lawfully do so) the Issuers hereby  expressly waive all benefit or
advantage  of any such law,  and  covenant  that they will not hinder,  delay or
impede the execution of any power herein granted to the Trustee, but will suffer
and  permit  the  execution  of every  such power as though no such law had been
enacted.

            SECTION 4.10.  Limitation on Restricted Payments.

            The  Company  will  not,  and will not  cause or  permit  any of its
Restricted Subsidiaries to, directly or indirectly,

            (i) declare or pay any dividend or make any distribution (other than
      dividends or  distributions  payable solely in Qualified  Capital Stock of
      the Company) on or in respect of shares of the Company's Capital Stock to

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      holders of such Capital Stock;

            (ii) purchase,  redeem or otherwise  acquire or retire for value any
      Capital  Stock of the  Company  or any  warrants,  rights  or  options  to
      purchase or acquire  shares of any class of such Capital  Stock other than
      through the exchange  therefor  solely of Qualified  Capital  Stock of the
      Company or  warrants,  rights or options to purchase or acquire  shares of
      Qualified Capital Stock of the Company;

           (iii) make any  principal  payment  on,  purchase,  defease,  redeem,
      prepay,  decrease or otherwise  acquire or retire for value,  prior to any
      scheduled final maturity,  scheduled  repayment or scheduled  sinking fund
      payment, any Indebtedness of the Company or a Subsidiary Guarantor that is
      subordinate or junior in right of payment to the Notes or such  Subsidiary
      Guarantor's Guarantee, as the case may be; or

            (iv)  make any Investment (other than a Permitted Investment)

(each of the foregoing  actions set forth in clauses (i),  (ii),  (iii) and (iv)
being referred to as a "Restricted Payment"),  if at the time of such Restricted
Payment or immediately after giving effect thereto, (a) a Default or an Event of
Default  shall have occurred and be  continuing,  (b) the Company is not able to
incur  at  least  $1.00  of  additional   Indebtedness   (other  than  Permitted
Indebtedness)  in  compliance  with  Section  4.12;  provided,   however,   that
notwithstanding  the  provisions of clause (i) (a) of Section 4.12, for purposes
of  determining  whether the Company  could incur such  additional  Indebtedness
pursuant to this clause (b), the Consolidated  EBITDA Coverage Ratio which shall
be  required  shall be at  least  2.5 to 1.0,  or (c) the  aggregate  amount  of
Restricted Payments (including such proposed Restricted Payment) made subsequent
to the Issue Date (the amount expended for such purposes, if other than in cash,
being the fair market value of such  property as  determined  reasonably  and in
good faith by the Board of Directors of the Company) shall exceed the sum of:

            (A) 50% of the cumulative  Consolidated Net Income (or if cumulative
      Consolidated  Net Income shall be a loss,  minus 100% of such loss) of the
      Company  earned  subsequent  to the Issue Date and on or prior to the last
      date of the Company's fiscal quarter immediately preceding such Restricted
      Payment  (the  "Reference   Date")  (treating  such  period  as  a  single
      accounting period); plus

            (B) 100% of the aggregate net cash proceeds  received by the Company
      from any Person  (other than a Restricted  Subsidiary of the Company) from
      the issuance and sale  subsequent to the Issue Date and on or prior to the
      Reference Date of Qualified Capital Stock of the Company, plus

            (C) without  duplication of any amounts  included in the immediately
      preceding  subclause  (B),  100% of the aggregate net cash proceeds of any
      equity contribution received by the Company from a holder of the Company's
      Capital Stock

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      (excluding in the case of the  immediately  preceding  clause (B) and this
      clause (C), any net cash  proceeds  from an Equity  Offering to the extent
      used to redeem the Notes); plus

            (D)  an  amount  equal  to  the  net  reduction  in  Investments  in
      Unrestricted  Subsidiaries  resulting from dividends,  interest  payments,
      repayments of loans or advances,  or other transfers of cash, in each case
      to the  Company  or to any  Restricted  Subsidiary  of  the  Company  from
      Unrestricted  Subsidiaries  (but  without  duplication  of any such amount
      included  in  calculating  cumulative   Consolidated  Net  Income  of  the
      Company),   or  from   redesignations  of  Unrestricted   Subsidiaries  as
      Restricted Subsidiaries (in each case valued as provided in Section 4.14),
      not to exceed, in the case of any Unrestricted  Subsidiary,  the amount of
      Investments previously made by the Company or any Restricted Subsidiary in
      such Unrestricted Subsidiary and which was treated as a Restricted Payment
      hereunder; plus

            (E) without duplication of the immediately  preceding subclause (D),
      an amount  equal to the lesser of the cost or net cash  proceeds  received
      upon the sale or other  disposition of any Investment made after the Issue
      Date  which  had  been  treated  as  a  Restricted  Payment  (but  without
      duplication  of  any  such  amount  included  in  calculating   cumulative
      Consolidated Net Income of the Company); plus

            (F)   $5,000,000.

Notwithstanding the foregoing, the provisions set forth above will not prohibit:

            (1) The payment of any dividend or redemption payment within 60 days
      after the date of declaration of such dividend or applicable redemption if
      the dividend or  redemption  payment,  as the case may be, would have been
      permitted on the date of declaration;

            (2) If no  Default or Event of Default  shall have  occurred  and be
      continuing, the acquisition of any shares of Capital Stock of the Company,
      either (a) solely in exchange for shares of Qualified Capital Stock of the
      Company or (b) through the  application of net proceeds of a substantially
      concurrent  sale for cash (other than to a  Restricted  Subsidiary  of the
      Company) of shares of Qualified Capital Stock of the Company;

            (3) If no  Default or Event of Default  shall have  occurred  and be
      continuing,  the  acquisition  of  any  Indebtedness  of  the  Company  or
      Subsidiary  Guarantor that is subordinate or junior in right of payment to
      the Notes or such Subsidiary  Guarantor's  Guarantee,  as the case may be,
      either (a) solely in exchange for shares of Qualified Capital Stock of the
      Company  or  (b)  through  the  application  of  the  net  proceeds  of  a
      substantially  concurrent  sale  for  cash  (other  than  to a  Restricted
      Subsidiary of the Company) of (i) shares of Qualified Capital Stock of the
      Company or (ii) Refinancing Indebtedness;


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            (4) If no  Default or Event of Default  shall have  occurred  and be
      continuing,  the payment of dividends in respect of the  Company's  Series
      1995-B  Preferred  Stock in an amount  not to exceed  $400,000  in any one
      year;

            (5)   The initial designation of Cascade, Grey Wolf and Western as
      Unrestricted Subsidiaries; and

            (6) The payment of such portion of the CGGS purchase  price, if any,
as shall have been  placed in an escrow  account to the former  shareholders  of
CGGS.

            In  determining  the aggregate  amount of  Restricted  Payments made
subsequent to the Issue Date in accordance with clause (c) of this Section 4.10,
amounts  expended  pursuant to clauses (1),  (2)(b) and (5) shall be included in
such calculation.

            SECTION 4.11.  Limitation on Transactions
                              with Affiliates.

            (i) The  Company  will not,  and will not cause or permit any of its
Restricted Subsidiaries to, directly or indirectly,  enter into, amend or permit
or suffer to exist any transaction or series of related transactions (including,
without limitation,  the purchase,  sale, lease or exchange of any property, the
guaranteeing  of any  Indebtedness  or the rendering of any service) with or for
the benefit of any of their respective Affiliates (an "Affiliate  Transaction"),
other than (a) Affiliate  Transactions  permitted  under  paragraph (ii) of this
Section 4.11 and (b) Affiliate  Transactions that are on terms that are fair and
reasonable to the Company or the  applicable  Restricted  Subsidiary  and are no
less favorable to the Company or the applicable Restricted Subsidiary than those
that might  reasonably  have been obtained in a comparable  transaction  at such
time on an  arm's-length  basis from a Person  that is not an  Affiliate  of the
Company or such  Restricted  Subsidiary.  All Affiliate  Transactions  (and each
series of related Affiliate  Transactions  which are similar or part of a common
plan) involving aggregate payments or other property with a fair market value in
excess of $1,000,000 shall be approved by the Board of Directors of the Company,
such approval to be evidenced by a Board  Resolution  stating that such Board of
Directors  has  determined  that such  transaction  complies  with the foregoing
provisions. If the Company or any Restricted Subsidiary enters into an Affiliate
Transaction (or a series of related Affiliate  Transactions  related to a common
plan) that involves an aggregate fair market value of more than $10,000,000, the
Company shall, prior to the consummation thereof,  obtain a favorable opinion as
to the fairness of such  transaction  or series of related  transactions  to the
Company  or the  relevant  Restricted  Subsidiary,  as the case  may be,  from a
financial point of view, from an Independent  Advisor and file the same with the
Trustee.

            (ii) The restrictions set forth in clause (i) shall not apply to (a)
reasonable fees and  compensation  paid to and indemnity  provided on behalf of,
officers,  directors,  employees or consultants of the Company or any Restricted
Subsidiary  as  determined  in good  faith by the Board of  Directors  or senior
management of the Company or such Restricted Subsidiary, as the case may be; (b)
transactions exclusively between or among

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the Company and any of its Restricted  Subsidiaries  or  exclusively  between or
among such Restricted  Subsidiaries;  provided,  however, that such transactions
are not  otherwise  prohibited  hereunder;  (c)  Restricted  Payments  permitted
hereunder;  and (iv) the payment of such portion of the CGGS purchase  price, if
any, as shall have been held in escrow to the former shareholders of CGGS.

            SECTION 4.12.     Limitation on Incurrence
                              of Additional Indebtedness.

            Other than  Permitted  Indebtedness,  the Company will not, and will
not  cause  or  permit  any of  its  Restricted  Subsidiaries  to,  directly  or
indirectly,   create,  incur,  assume,   guarantee,   acquire,   become  liable,
contingently or otherwise,  with respect to, or otherwise become responsible for
payment of (collectively,  "incur") any Indebtedness; provided, however, that if
no Default or Event of Default shall have occurred and be continuing at the time
of or as a consequence of the incurrence of any such  Indebtedness,  the Company
and  the  Restricted   Subsidiaries  or  any  of  them  may  incur  Indebtedness
(including, without limitation,  Acquired Indebtedness), in each case, if on the
date of the  incurrence of such  Indebtedness,  after giving pro forma effect to
the  incurrence  thereof  and  the  receipt  and  application  of  the  proceeds
therefrom,  (i) both (a) the Company's  Consolidated EBITDA Coverage Ratio would
have been greater than 2.25 to 1.0 if such proposed incurrence is on or prior to
November 1, 1997 and at least equal to 2.5 to 1.0 if such proposed incurrence is
thereafter and (b) the Company's  Adjusted  Consolidated Net Tangible Assets are
equal to or greater than 150% of the aggregate consolidated  Indebtedness of the
Company  and  its  Restricted   Subsidiaries  or  (ii)  the  Company's  Adjusted
Consolidated  Net  Tangible  Assets  are  equal to or  greater  than 200% of the
aggregate   consolidated   Indebtedness   of  the  Company  and  its  Restricted
Subsidiaries.

      For purposes of determining any particular  amount of  Indebtedness  under
this  Section  4.12,  guarantees  of  Indebtedness  otherwise  included  in  the
determination of such amount shall not also be included.

      Indebtedness  of a Person  existing  at the time  such  Person  becomes  a
Restricted Subsidiary (whether by merger, consolidation,  acquisition of Capital
Stock or  otherwise)  or is merged  with or into the  Company or any  Restricted
Subsidiary or which is secured by a Lien on an asset  acquired by the Company or
a  Restricted  Subsidiary  (whether or not such  Indebtedness  is assumed by the
acquiring  Person)  shall be deemed  incurred  at the time the Person  becomes a
Restricted  Subsidiary or at the time of the asset acquisition,  as the case may
be.

      The Company  will not,  and will not permit any  Subsidiary  Guarantor  to
incur any  Indebtedness  which by its  terms  (or by the terms of any  agreement
governing such  Indebtedness)  is  subordinated in right of payment to any other
Indebtedness   of  the  Company  or  such  Subsidiary   Guarantor   unless  such
Indebtedness  is also by its terms (or by the terms of any  agreement  governing
such Indebtedness)  made expressly  subordinate in right of payment to the Notes
or the Guarantee of such Subsidiary  Guarantor,  as the case may be, pursuant to
subordination  provisions that are substantively  identical to the subordination

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provisions of such  Indebtedness  (or such agreement) that are most favorable to
the  holders  of any  other  Indebtedness  of the  Company  or  such  Subsidiary
Guarantor, as the case may be.

            SECTION 4.13.  Limitation on Dividend and Other Payment Restrictions
Affecting Restricted Subsidiaries.

            The  Company  will  not,  and will not  cause or  permit  any of its
Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or
permit  to exist or become  effective  any  encumbrance  or  restriction  on the
ability of any  Restricted  Subsidiary  to: (a) pay  dividends or make any other
distributions on or in respect of its Capital Stock; (b) make loans or advances,
or pay any  Indebtedness or other  obligation  owed, to the Company or any other
Restricted Subsidiary; (c) guarantee any Indebtedness or any other obligation of
the Company or any Restricted Subsidiary; or (d) transfer any of its property or
assets to the Company or any other Restricted  Subsidiary (each such encumbrance
or  restriction,  a  "Payment  Restriction"),  except for such  encumbrances  or
restrictions  existing  under or by reason  of:  (1)  applicable  law;  (2) this
Indenture; (3) the New Credit Facility; (4) customary non-assignment  provisions
of any contract or any lease  governing a leasehold  interest of any  Restricted
Subsidiary;   (5)  any  instrument   governing  Acquired   Indebtedness,   which
encumbrance or restriction is not applicable to such Restricted  Subsidiary,  or
the properties or assets of such Restricted Subsidiary, other than the Person or
the property or assets of the Person so acquired; (6) agreements existing on the
Issue Date to the extent and in the manner such  agreements are in effect on the
Issue Date; (7) customary  restrictions with respect to a Restricted  Subsidiary
of the Company  pursuant to an agreement that has been entered into for the sale
or  disposition of Capital Stock or assets of such  Restricted  Subsidiary to be
consummated in accordance with the terms of this Indenture  solely in respect of
the  assets or  Capital  Stock to be sold or  disposed  of;  (8) any  instrument
governing a Permitted Lien, to the extent and only to the extent such instrument
restricts the transfer or other  disposition of assets subject to such Permitted
Lien;  or  (9) an  agreement  governing  Refinancing  Indebtedness  incurred  to
Refinance the Indebtedness issued,  assumed or incurred pursuant to an agreement
referred to in clause (2), (3), (5) or (6) above;  provided,  however,  that the
provisions  relating to such  encumbrance or  restriction  contained in any such
Refinancing  Indebtedness  are no less  favorable to the Holders in any material
respect  as  determined  by the  Board  of  Directors  of the  Company  in their
reasonable  and  good  faith  judgment  than  the  provisions  relating  to such
encumbrance or restriction  contained in the applicable agreement referred to in
such clause (2), (3), (5), or (6).


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            SECTION 4.14.     Limitation on Restricted
                              and Unrestricted Subsidiaries.

            The Board of Directors  may, if no Default or Event of Default shall
have  occurred  and  be  continuing  or  would  arise  therefrom,  designate  an
Unrestricted Subsidiary to be a Restricted Subsidiary;  provided,  however, that
(i) any such redesignation shall be deemed to be an incurrence as of the date of
such  redesignation  by the  Company  and  its  Restricted  Subsidiaries  of the
Indebtedness  (if any) of such  redesignated  Subsidiary for purposes of Section
4.12, (ii) unless such  redesignated  Subsidiary shall not have any Indebtedness
outstanding,  other than Indebtedness which would be Permitted Indebtedness,  no
such designation  shall be permitted if immediately  after giving effect to such
redesignation and the incurrence of any such additional Indebtedness the Company
could  not  incur  $1.00  of  additional   Indebtedness  (other  than  Permitted
Indebtedness)  pursuant  to Section  4.12 and (iii) such  Subsidiary  assumes by
execution of a  supplemental  indenture all of the  obligations  of a Subsidiary
Guarantor under a Guarantee.

            The Board of  Directors  of the  Company  also may, if no Default or
Event of Default shall have occurred and be continuing or would arise therefrom,
designate any Restricted Subsidiary to be an Unrestricted Subsidiary if (i) such
designation  is at that time permitted  under Section 4.10 and (ii)  immediately
after  giving  effect to such  designation,  the  Company  could  incur $1.00 of
additional  Indebtedness (other than Permitted Indebtedness) pursuant to Section
4.12. Any such  designation by the Board of Directors  shall be evidenced to the
Trustee by the filing with the Trustee of a certified  copy of the resolution of
the Board of Directors giving effect to such designation or redesignation and an
Officers' Certificate certifying that such designation or redesignation complied
with the  foregoing  conditions  and  setting  forth in  reasonable  detail  the
underlying  calculations.  In  the  event  that  any  Restricted  Subsidiary  is
designated an Unrestricted Subsidiary in accordance with this Section 4.14, such
Restricted Subsidiary's Guarantee will be released.

            For purposes of Section 4.10, (i) an "Investment" shall be deemed to
have  been  made at the time  any  Restricted  Subsidiary  is  designated  as an
Unrestricted  Subsidiary in an amount  (proportionate  to the  Company's  equity
interest  in  such  Subsidiary)  equal  to the  net  worth  of  such  Restricted
Subsidiary  at the time that such  Restricted  Subsidiary  is  designated  as an
Unrestricted Subsidiary; (ii) at any date the aggregate amount of all Restricted
Payments made as  Investments  since the Issue Date shall exclude and be reduced
by an amount (proportionate to the Company's equity interest in such Subsidiary)
equal to the net  worth of any  Unrestricted  Subsidiary  at the time  that such
Unrestricted Subsidiary is designated a Restricted Subsidiary, not to exceed, in
the case of any such redesignation of an Unrestricted Subsidiary as a Restricted
Subsidiary,  the amount of  Investments  previously  made by the Company and the
Restricted  Subsidiaries in such  Unrestricted  Subsidiary (in each case (i) and
(ii) "net worth" to be calculated based upon the fair market value of the assets
of such Subsidiary as of any such date of  designation);  and (iii) any property
transferred to or from an  Unrestricted  Subsidiary  shall be valued at its fair
market value at the time of such transfer.

            Notwithstanding  the  foregoing,  the  Board  of  Directors  may not
designate any

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Subsidiary  of the  Company  to be an  Unrestricted  Subsidiary  if,  after such
designation,  (a) the Company or any Restricted  Subsidiary (i) provides  credit
support for, or a guarantee of, any  Indebtedness of such Subsidiary  (including
any undertaking,  agreement or instrument  evidencing such Indebtedness) or (ii)
is directly or indirectly  liable for any Indebtedness of such Subsidiary or (b)
such  Subsidiary  owns any  Capital  Stock  of, or owns or holds any Lien on any
property  of,  any  Restricted  Subsidiary  which  is  not a  Subsidiary  of the
Subsidiary to be so designated.

            Notwithstanding  the foregoing,  the provisions set forth above will
not prohibit the initial  designation of each of Grey Wolf,  Cascade and Western
as Unrestricted Subsidiaries.

            Subsidiaries  of the Company that are not designated by the Board of
Directors  as  Restricted  or  Unrestricted  Subsidiaries  will be  deemed to be
Restricted  Subsidiaries.  Notwithstanding  any provisions of this Section 4.14,
all   Subsidiaries   of  an   Unrestricted   Subsidiary   will  be  Unrestricted
Subsidiaries.

            SECTION 4.15.  Change of Control.

            (a) Upon the  occurrence  of a Change of  Control,  each Holder will
have the right to require that the Issuers  repurchase  all or a portion of such
Holder's  Notes  pursuant to the offer  described  below (the "Change of Control
Offer"),  at a purchase price equal to 101% of the principal amount thereof plus
accrued and unpaid interest, if any, thereon to the date of purchase.

            (b)  Within  30 days  following  the date upon  which the  Change of
Control  occurred,  the Issuers must send, by first class mail, a notice to each
Holder at such Holder's  last  registered  address,  with a copy to the Trustee,
which notice shall govern the terms of the Change of Control  Offer.  The notice
to the Holders shall contain all instructions and materials  necessary to enable
such  Holders to tender  Notes  pursuant  to the Change of Control  Offer.  Such
notice shall state:

             (i) that the Change of Control Offer is being made pursuant to this
      Section 4.15,  that all Notes  tendered and not withdrawn will be accepted
      for payment and that the Change of Control  Offer shall  remain open for a
      period of 20  Business  Days or such  longer  period as may be required by
      law;

            (ii) the purchase price  (including the amount of accrued  interest)
      and the  purchase  date (which  shall be no earlier than 30 days nor later
      than 45 days from the date such  notice is  mailed,  other  than as may be
      required by law) (the "Change of Control Payment Date");

           (iii)  that any Note not tendered will continue to accrue interest;

            (iv) that,  unless the Issuers  default in making payment  therefor,
      any Note  accepted  for payment  pursuant  to the Change of Control  Offer
      shall cease to accrue interest after the Change of Control Payment Date;

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             (v) that Holders  electing to have a Note  purchased  pursuant to a
      Change of Control Offer will be required to surrender  the Note,  with the
      form entitled  "Option of Holder to Elect  Purchase" on the reverse of the
      Note completed, to the Paying Agent at the address specified in the notice
      prior to the  close of  business  on the third  Business  Day prior to the
      Change of Control Payment Date;

            (vi) that Holders will be entitled to withdraw their election if the
      Paying Agent receives, not later than the second Business Day prior to the
      Change of Control Payment Date, a telegram,  telex, facsimile transmission
      or letter  setting forth the name of the Holder,  the principal  amount of
      the Notes the Holder  delivered  for  purchase  and a statement  that such
      Holder is withdrawing his election to have such Notes purchased;

           (vii) that  Holders  whose Notes are  purchased  only in part will be
      issued new Notes in a principal amount equal to the unpurchased portion of
      the Notes  surrendered;  provided,  however,  that each Note purchased and
      each new Note issued shall be in an original principal amount of $1,000 or
      integral multiples thereof; and

          (viii)  the circumstances and relevant facts regarding such Change of
      Control.

            On or before the Change of Control  Payment Date,  the Issuers shall
(i) accept for payment Notes or portions thereof tendered pursuant to the Change
of Control Offer,  (ii) deposit with the Paying Agent in accordance with Section
2.14 U.S.  Legal  Tender  sufficient  to pay the  purchase  price  plus  accrued
interest,  if any,  of all Notes so  tendered  and (iii)  deliver to the Trustee
Notes so accepted  together with an Officers'  Certificate  stating the Notes or
portions  thereof  being  purchased by the  Issuers.  Upon receipt by the Paying
Agent of the monies  specified in clause (ii) above and a copy of the  Officers'
Certificate  specified in clause (iii)  above,  the Paying Agent shall  promptly
mail to the  Holders  of Notes so  accepted  payment  in an amount  equal to the
purchase  price plus accrued  interest,  if any, and the Trustee shall  promptly
authenticate and mail to such Holders new Notes equal in principal amount to any
unpurchased portion of the Notes surrendered. Any Notes not so accepted shall be
promptly  mailed by the  Company to the Holder  thereof.  For  purposes  of this
Section 4.15, the Trustee shall act as the Paying Agent.

            The Issuers  shall not be required to make a Change of Control Offer
upon a Change of Control if a third party  makes the Change of Control  Offer at
the  Change of  Control  Purchase  Price,  at the same  times and  otherwise  in
compliance with the requirements applicable to a Change of Control Offer made by
the Issuers and  purchases all Notes  validly  tendered and not withdrawn  under
such Change of Control Offer.

            Neither  the Board of  Directors  of the Company nor the Trustee may
waive the

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provisions  of this Section 4.15  relating to the Issuers'  obligation to make a
Change of Control Offer.

            The Issuers  will comply with the  requirements  of Rule 14e-1 under
the Exchange Act and any other securities laws and regulations thereunder to the
extent  such  laws  and  regulations  are  applicable  in  connection  with  the
repurchase of Notes  pursuant to a Change of Control  Offer.  To the extent that
the  provisions  of  any  securities  laws  or  regulations  conflict  with  the
provisions  of this Section 4.15,  the Issuers shall comply with the  applicable
securities  laws and  regulations and shall not be deemed to have breached their
obligations under the provisions of this Section 4.15 by virtue thereof.

            SECTION 4.16.  Limitation on Asset Sales.

            (a) The  Company  will not,  and will not cause or permit any of its
Restricted Subsidiaries to, consummate an Asset Sale unless:

             (i) the Company or the  applicable  Restricted  Subsidiary,  as the
      case may be,  receives  consideration  at the time of such  Asset  Sale at
      least  equal to the fair  market  value of the  assets  sold or  otherwise
      disposed  of (as  determined  in good  faith  by the  Company's  Board  of
      Directors or senior management of the Company);

            (ii) (a) at least 70% of the  consideration  received by the Company
      or the  Restricted  Subsidiary,  as the case may be,  from such Asset Sale
      shall be in the form of cash or Cash  Equivalents  and is  received at the
      time  of  such  disposition  and (b) at  least  15% of such  consideration
      received  if in a form other than cash or Cash  Equivalents  is  converted
      into or  exchanged  for cash or Cash  Equivalents  within 120 days of such
      disposition; and

           (iii) upon the  consummation  of an Asset  Sale,  the  Company  shall
      apply, or cause such Restricted Subsidiary to apply, the Net Cash Proceeds
      relating to such Asset Sale within 365 days of receipt  thereof either (a)
      to repay or prepay Indebtedness outstanding under the New Credit Facility,
      including,  without  limitation,  a  permanent  reduction  in the  related
      commitment, (b) to repay or prepay any Indebtedness of the Company that is
      secured by a Lien  permitted to be incurred  pursuant to Section 4.18, (c)
      to make an investment in properties or assets that replace the  properties
      or assets  that were the  subject of such Asset Sale or in  properties  or
      assets that will be used in the business of the Company and its Restricted
      Subsidiaries  as  existing on the Issue Date or in  businesses  reasonably
      related thereto ("Replacement  Assets"), (d) to an investment in Crude Oil
      and Natural Gas Related  Assets or (e) a  combination  of  prepayment  and
      investment  permitted by the foregoing  clauses (iii)(a) through (iii)(d).
      On the 366th day after an Asset Sale or such earlier  date, if any, as the
      Board of  Directors  of the Company  determines  not to apply the Net Cash
      Proceeds  relating  to such Asset  Sale as set forth in  clauses  (iii)(a)
      through  (iii)(d) of the next  preceding  sentence  (each a "Net  Proceeds
      Offer Trigger  Date"),  such  aggregate  amount of Net Cash Proceeds which
      have been received by the Company or such Restricted  Subsidiary but which
      have

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      not been  applied on or before such Net  Proceeds  Offer  Trigger  Date as
      permitted  in clauses  (iii)(a)  through  (iii)(d)  of the next  preceding
      sentence  (each a "Net  Proceeds  Offer  Amount")  shall be applied by the
      Company  or such  Restricted  Subsidiary,  as the case may be,  to make an
      offer to purchase (a "Net  Proceeds  Offer") on a date (the "Net  Proceeds
      Offer Payment  Date") not less than 30 nor more than 45 days following the
      applicable Net Proceeds Offer Trigger Date, from all Holders on a pro rata
      basis,  that principal  amount of Notes  purchasable with the Net Proceeds
      Offer Amount at a price equal to 100% of the principal amount of the Notes
      to be purchased,  plus accrued and unpaid interest, if any, thereon to the
      date of  purchase;  provided,  however,  that if at any time any  non-cash
      consideration received by the Company or any Restricted Subsidiary, as the
      case may be, in connection  with any Asset Sale is converted  into or sold
      or  otherwise  disposed  of for cash (other than  interest  received  with
      respect  to any such  non-cash  consideration),  then such  conversion  or
      disposition  shall be deemed to constitute an Asset Sale hereunder and the
      Net Cash Proceeds thereof shall be applied in accordance with this Section
      4.16.  The  Company  may defer the Net  Proceeds  Offer  until there is an
      aggregate  unutilized  Net Proceeds  Offer Amount equal to or in excess of
      $5,000,000  resulting  from one or more Asset  Sales (at which  time,  the
      entire  unutilized Net Proceeds  Offer Amount,  and not just the amount in
      excess of  $5,000,000,  shall be  applied  as  required  pursuant  to this
      paragraph).

            In the event of the transfer of  substantially  all (but not all) of
the property  and assets of the Company and its  Restricted  Subsidiaries  as an
entirety  to a  Person  in a  transaction  permitted  under  Section  5.01,  the
successor  corporation shall be deemed to have sold the properties and assets of
the Company and its Restricted  Subsidiaries  not so transferred for purposes of
this Section  4.16,  and shall comply with the  provisions  of this Section 4.16
with respect to such deemed sale as if it were an Asset Sale.  In addition,  the
fair market value of such properties and assets of the Company or its Restricted
Subsidiaries  deemed  to be sold  shall be deemed  to be Net Cash  Proceeds  for
purposes of this Section 4.16.

            Notwithstanding  the  two  immediately  preceding  paragraphs,   the
Company and its Restricted Subsidiaries will be permitted to consummate an Asset
Sale without  complying with such paragraphs to the extent (a) the consideration
for such Asset Sale constitutes  Replacement Assets and/or Crude Oil and Natural
Gas Related  Assets and (b) such Asset Sale is for fair market value;  provided,
however,  that any consideration not constituting  Replacement  Assets and Crude
Oil and  Natural  Gas  Related  Assets  received  by the  Company  or any of its
Restricted  Subsidiaries  in  connection  with any Asset  Sale  permitted  to be
consummated  under this paragraph shall  constitute Net Cash Proceeds subject to
the provisions of the two immediately preceding paragraphs.

            (b) Subject to the deferral of the Net Proceeds  Offer  contained in
clause  (a)(iii)  above,  each notice of a Net Proceeds  Offer  pursuant to this
Section 4.16 shall be mailed or caused to be mailed, by first class mail, by the
Issuers not more than 30 days after the Net Proceeds  Offer  Trigger Date to all
Holders at their last  registered  addresses,  with a copy to the  Trustee.  The
notice shall contain all instructions and materials necessary to enable such

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            Holders to tender Notes pursuant to the Net Proceeds Offer and shall
state the following terms:

             (i) that the Net Proceeds  Offer is being made  pursuant to Section
      4.16,  that all Notes  tendered  will be accepted for  payment;  provided,
      however, that if the aggregate principal amount of Notes tendered in a Net
      Proceeds  Offer plus  accrued  interest  at the  expiration  of such offer
      exceeds the aggregate  amount of the Net Proceeds Offer, the Issuers shall
      select  the  Notes  to  be  purchased  on a  pro  rata  basis  (with  such
      adjustments as may be deemed appropriate by the Issuers so that only Notes
      in  denominations  of $1,000 or multiples  thereof shall be purchased) and
      that the Net Proceeds  Offer shall remain open for a period of 20 Business
      Days or such longer period as may be required by law;

            (ii) the purchase price  (including the amount of accrued  interest)
      and the Net Proceeds  Offer  Payment Date (which shall be not less than 30
      nor more than 45 days  following the applicable Net Proceeds Offer Trigger
      Date and which  shall be at least five  business  days  after the  Trustee
      receives notice thereof from the Issuers);

           (iii)  that any Note not tendered will continue to accrue interest;

            (iv) that,  unless the Issuers  default in making payment  therefor,
      any Note  accepted for payment  pursuant to the Net  Proceeds  Offer shall
      cease to accrue interest after the Net Proceeds Offer Payment Date;

             (v) that Holders  electing to have a Note  purchased  pursuant to a
      Net Proceeds  Offer will be required to surrender the Note,  with the form
      entitled  "Option of Holder to Elect  Purchase" on the reverse of the Note
      completed,  to the Paying  Agent at the  address  specified  in the notice
      prior to the close of business on the third  Business Day prior to the Net
      Proceeds Offer Payment Date;

            (vi) that Holders will be entitled to withdraw their election if the
      Paying Agent receives, not later than the second Business Day prior to the
      Net Proceeds Offer Payment Date, a telegram, telex, facsimile transmission
      or letter  setting forth the name of the Holder,  the principal  amount of
      the Notes the Holder  delivered  for  purchase  and a statement  that such
      Holder is withdrawing his election to have such Note purchased; and

           (vii) that  Holders  whose Notes are  purchased  only in part will be
      issued new Notes in a principal amount equal to the unpurchased portion of
      the Notes  surrendered;  provided,  however,  that each Note purchased and
      each new Note issued shall be in an original principal amount of $1,000 or
      integral multiples thereof;

            On or before the Net Proceeds  Offer Payment Date, the Issuers shall
(i) accept for payment Notes or portions  thereof  tendered  pursuant to the Net
Proceeds  Offer which are to be purchased in accordance  with item (b)(i) above,
(ii) deposit with the

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Paying Agent in accordance with Section 2.14 U.S. Legal Tender sufficient to pay
the purchase price plus accrued  interest,  if any, of all Notes to be purchased
and (iii)  deliver to the Trustee  Notes so accepted  together with an Officers'
Certificate  stating  the  Notes or  portions  thereof  being  purchased  by the
Issuers.  The  Paying  Agent  shall  promptly  mail to the  Holders  of Notes so
accepted payment in an amount equal to the purchase price plus accrued interest,
if any. For purposes of this Section  4.16,  the Trustee shall act as the Paying
Agent.

            The Issuers  will comply with the  requirements  of Rule 14e-1 under
the Exchange Act and any other securities laws and regulations thereunder to the
extent  such  laws  and  regulations  are  applicable  in  connection  with  the
repurchase  of Notes  pursuant to a Net Proceeds  Offer.  To the extent that the
provisions of any securities laws or regulations conflict with the provisions of
this Section 4.16, the Issuers shall comply with the applicable  securities laws
and regulations and shall not be deemed to have breached their obligations under
the provisions of this Section 4.16 by virtue thereof.

            SECTION 4.17.     Limitation on Preferred
                              Stock of Restricted Subsidiaries.

            The  Company  will  not  cause  or  permit  any  of  its  Restricted
Subsidiaries  to issue any  Preferred  Stock  (other than to the Company or to a
Wholly Owned Restricted Subsidiary) or permit any Person (other than the Company
or a Wholly  Owned  Restricted  Subsidiary)  to own any  Preferred  Stock of any
Restricted Subsidiary.

            SECTION 4.18.     Limitation on Liens.

            Other than Permitted Liens, the Company will not, and will not cause
or permit any of its Restricted Subsidiaries to, directly or indirectly, create,
incur, assume or permit or suffer to exist any Liens of any kind against or upon
any  property  or assets of the  Company or any of its  Restricted  Subsidiaries
(whether  owned on the Issue  Date or  acquired  after  the  Issue  Date) or any
proceeds therefrom, or assign or otherwise convey any right to receive income or
profits therefrom unless (a) in the case of Liens securing  Indebtedness that is
expressly  subordinate  or  junior  in  right  of  payment  to the  Notes or any
Guarantee,  the Notes or such  Guarantee,  as the case may be, are  secured by a
Lien on such  property,  assets or  proceeds  that is senior in priority to such
Liens at least to the same  extent as the Notes are senior in  priority  to such
Indebtedness  and (b) in all  other  cases,  the Notes  and the  Guarantees  are
equally and ratably secured.

            SECTION 4.19.     Limitation on Conduct of Business.

            The  Company  will not,  and will not permit  any of its  Restricted
Subsidiaries  to, engage in the conduct of any business other than the Crude Oil
and Natural Gas Business.

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            SECTION 4.20.     Additional Subsidiary Guarantees.

            If the Company or any of its  Restricted  Subsidiaries  transfers or
causes  to  be   transferred,   in  one  transaction  or  a  series  of  related
transactions, any property to any Restricted Subsidiary that is not a Subsidiary
Guarantor,  or if  the  Company  or any of  its  Restricted  Subsidiaries  shall
organize,  acquire  or  otherwise  invest in or hold an  Investment  in  another
Restricted  Subsidiary  having  total  consolidated  assets with a book value in
excess of $500,000 that is not a Subsidiary  Guarantor,  then such transferee or
acquired  or other  Restricted  Subsidiary  shall (a) execute and deliver to the
Trustee a supplemental indenture in form reasonably  satisfactory to the Trustee
pursuant to which such Restricted Subsidiary shall unconditionally guarantee all
of the Company's obligations under the Notes and this Indenture on the terms set
forth in this Indenture and (b) deliver to the Trustee an Opinion of Counsel and
an  Officers'  Certificate,  stating  that no event of default  shall occur as a
result of such supplemental  indenture,  that it complies with the terms of this
Indenture  and  that  such  supplemental  indenture  has been  duly  authorized,
executed and delivered by such  Restricted  Subsidiary and  constitutes a legal,
valid,  binding  and  enforceable  obligation  of  such  Restricted  Subsidiary.
Thereafter,  such Restricted  Subsidiary shall be a Subsidiary Guarantor for all
purposes of the Indenture.


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                                 ARTICLE FIVE

                             SUCCESSOR CORPORATION


            SECTION 5.1.      Merger, Consolidation
                              and Sale of Assets.

            The Company will not, in a single  transaction  or series of related
transactions,  consolidate  or merge with or into any Person,  or sell,  assign,
transfer,  lease,  convey  or  otherwise  dispose  of (or  cause or  permit  any
Restricted  Subsidiary to sell,  assign,  transfer,  lease,  convey or otherwise
dispose of) all or substantially  all of the Company's  assets  (determined on a
consolidated basis for the Company and its Restricted Subsidiaries),  whether as
an entirety or substantially as an entirety to any Person unless: (a) either (i)
the  Company or such  Restricted  Subsidiary,  as the case may be,  shall be the
surviving  or  continuing  corporation  or (ii) the  Person  (if other  than the
Company) formed by such consolidation or into which the Company is merged or the
Person which acquires by sale, assignment,  transfer, lease, conveyance or other
disposition  the  properties  and  assets  of the  Company  and  its  Restricted
Subsidiaries  substantially as an entirety (the "Surviving Entity") (x) shall be
a corporation organized and validly existing under the laws of the United States
or any state thereof or the District of Columbia and (y) shall expressly assume,
by supplemental  indenture (in form and substance  satisfactory to the Trustee),
executed  and  delivered to the  Trustee,  the due and  punctual  payment of the
principal  of,  premium,  if  any,  and  interest  on all of the  Notes  and the
performance of every covenant of the Notes,  the Indenture and the  Registration
Rights  Agreement on the part of the Company to be  performed  or observed;  (b)
immediately   after  giving  effect  to  such  transaction  and  the  assumption
contemplated  by  clause  (a)(ii)(y)  above  (including  giving  effect  to  any
Indebtedness  incurred or  anticipated  to be incurred in connection  with or in
respect of such transaction),  the Company or such Surviving Entity, as the case
may be, (i) shall have a  Consolidated  Net Worth  equal to or greater  than the
Consolidated Net Worth of the Company  immediately prior to such transaction and
(ii) shall be able to incur at least  $1.00 of  additional  Indebtedness  (other
than Permitted  Indebtedness)  pursuant to Section 4.12 hereof;  (c) immediately
before  and  immediately  after  giving  effect  to  such  transaction  and  the
assumption   contemplated  by  clause  (a)(ii)(y)  above   (including,   without
limitation,  giving effect to any  Indebtedness  incurred or  anticipated  to be
incurred  and  any  Lien  granted  in  connection  with  or in  respect  of  the
transaction),  no  Default  or  Event  of  Default  shall  have  occurred  or be
continuing;  and (d) the Company or the  Surviving  Entity,  as the case may be,
shall have delivered to the Trustee an officers'  certificate  and an opinion of
counsel,  each  stating  that  such  consolidation,  merger,  sale,  assignment,
transfer,  lease,  conveyance  or  other  disposition  and,  if  a  supplemental
indenture is required in connection  with such  transaction,  such  supplemental
indenture comply with the applicable  provisions  hereof and that all conditions
precedent in this Indenture  relating to such  transaction  have been satisfied;
provided,  however,  that such  counsel  may rely,  as to matters of fact,  on a
certificate or certificates of officers of the Company.


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            For purposes of the foregoing,  the transfer (by lease,  assignment,
sale or otherwise,  in a single transaction or series of transactions) of all or
substantially  all of the  properties  or  assets  of  one  or  more  Restricted
Subsidiaries the Capital Stock of which  constitutes all or substantially all of
the properties and assets of the Company,  shall be deemed to be the transfer of
all or substantially all of the properties and assets of the Company.

            Notwithstanding  the  foregoing,   nothing  in  this  Section  shall
prohibit the merger of CGGS with and into Canadian Abraxas.

            Each Subsidiary Guarantor (other than any Subsidiary Guarantor whose
Guarantee is to be released in  accordance  with the terms of the  Guarantee and
this Indenture in connection with any transaction  complying with the provisions
of the  Indenture  described  under Article Five) will not, and the Company will
not cause or permit any Subsidiary  Guarantor to, consolidate with or merge with
or into any Person other than the Company or another  Subsidiary  Guarantor that
is a Wholly Owned  Restricted  Subsidiary  unless:  (a) the entity  formed by or
surviving  any such  consolidation  or  merger  (if  other  than the  Subsidiary
Guarantor) or to which such sale,  lease,  conveyance or other disposition shall
have been made is a  corporation  organized  and existing  under the laws of the
United States or any state thereof or the District of Columbia;  (b) such entity
assumes by execution of a supplemental  indenture all of the  obligations of the
Subsidiary Guarantor under its Guarantee; (c) immediately after giving effect to
such  transaction,  no Default or Event of Default  shall have  occurred  and be
continuing;  and (d) immediately after giving effect to such transaction and the
use of any net  proceeds  therefrom  on a pro forma  basis,  the  Company  could
satisfy the  provisions of clause (b) of the first  paragraph of this  covenant.
Any merger or consolidation of a Subsidiary  Guarantor with and into the Company
(with the Company being the surviving  entity) or another  Subsidiary  Guarantor
that is a Wholly Owned Restricted Subsidiary need only comply with clause (d) of
the first paragraph of this Section 5.01.

            SECTION 5.02.     Successor Corporation Substituted.

            Upon any  consolidation,  merger,  conveyance,  lease or transfer in
accordance with Section 5.01, the successor Person formed by such  consolidation
or into  which  the  Company  is merged or to which  such  conveyance,  lease or
transfer is made shall  succeed to, and be  substituted  for,  and may  exercise
every right and power of, the Company under this  Indenture with the same effect
as if such successor had been named as the Company herein and thereafter (except
in the case of a lease) the  predecessor  corporation  will be  relieved  of all
further obligations and covenants under this Indenture and the Notes.


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                                  ARTICLE SIX

                                   REMEDIES


            SECTION 6.01.     Events of Default.

            An "Event of Default" means any of the following events:

            (a) the failure to pay interest (including any Additional  Interest)
      on any  Notes  when the same  becomes  due and  payable  and such  default
      continues for a period of 30 days;

            (b)  the  failure  to pay  the  principal  of any  Notes  when  such
      principal  becomes  due and  payable,  at  maturity,  upon  redemption  or
      otherwise  (including  the  failure  to make a payment to  purchase  Notes
      tendered pursuant to a Change of Control Offer or a Net Proceeds Offer);

            (c) a default in the observance or performance of any other covenant
      or agreement  contained in this  Indenture  which default  continues for a
      period of 30 days after either  Issuer or  Subsidiary  Guarantor  receives
      written notice  specifying the default (and demanding that such default be
      remedied)  from  the  Trustee  or  the  Holders  of at  least  25%  of the
      outstanding principal amount of the Notes (except in the case of a default
      with  respect  to  observance  or  performance  of  any of  the  terms  or
      provisions of Section 4.15, 4.16 or 5.01 which will constitute an Event of
      Default  with such notice  requirement  but without  such  passage of time
      requirement);

            (d) a default  under any  mortgage,  indenture or  instrument  under
      which  there may be issued or by which  there may be secured or  evidenced
      any  Indebtedness  of the  Company or any  Restricted  Subsidiary  (or the
      payment  of  which  is  guaranteed  by  the  Issuers  or  any   Restricted
      Subsidiary), whether such Indebtedness now exists, or is created after the
      Issue Date,  which  default (i) is caused by a failure to pay principal of
      or premium,  if any, or interest on such Indebtedness after any applicable
      grace period provided in such  Indebtedness (a "Payment  Default") or (ii)
      results in the  acceleration  of such  Indebtedness  prior to its  express
      maturity and, in each case, the principal amount of any such Indebtedness,
      together with the principal  amount of any other such  Indebtedness  under
      which there has been a Payment  Default or the  maturity of which has been
      so accelerated, aggregates $5,000,000 or more;

            (e) one or more  judgments  in an  aggregate  amount  in  excess  of
      $5,000,000 (unless covered by insurance by a reputable insurer as to which
      the insurer has  acknowledged  coverage) shall have been rendered  against
      the  Company  or any of its  Restricted  Subsidiaries  and such  judgments
      remain undischarged, unvacated, unpaid or unstayed for a period of 60 days
      after such

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      judgment or judgments become final and non-appealable;

            (f) the Company or any of its  Subsidiaries  pursuant to or under or
      within the meaning of any Bankruptcy Law:

                   (i)  commences a voluntary case or proceeding;

                  (ii)  consents to the entry of an order for relief  against it
            in an involuntary case or proceeding;

                  (iii) consents to the  appointment of a Custodian of it or for
            all or substantially all of its property;

                  (iv)  makes  a  general  assignment  for  the  benefit  of its
            creditors; or

                  (v) shall  generally  not pay its debts when such debts become
            due or  shall  admit  in  writing  its  inability  to pay its  debts
            generally;

            (g) a court of  competent  jurisdiction  enters  an order or  decree
      under any Bankruptcy Law that:

                  (i) is for relief against the Company or any Subsidiary of the
            Company in an involuntary case or proceeding,

                  (ii) appoints a Custodian of the Company or any  Subsidiary of
            the Company for all or substantially all of its Properties, or

                  (iii) orders the  liquidation of the Company or any Subsidiary
            of the  Company,  and in each  case  the  order  or  decree  remains
            unstayed and in effect for 60 days; or

            (h) any of the  Guarantees  cease to be in full  force and effect or
      any of the  Guarantees  are  declared  to be null and void or invalid  and
      unenforceable or any of the Subsidiary Guarantors denies or disaffirms its
      liability  under its  Guarantees  (other  than by reason of  release  of a
      Subsidiary Guarantor in accordance with the terms of this Indenture).

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            SECTION 6.02.     Acceleration.

            Upon the happening of any Event of Default specified in Section 6.01
the Trustee may, or the holders of at least 25% in aggregate principal amount of
outstanding  Notes may,  declare the principal of, premium,  if any, and accrued
and unpaid  interest on all the Notes to be due and payable by notice in writing
to the Issuers and the Trustee  specifying the  respective  Event of Default and
that it is a "notice of acceleration" and the same shall become  immediately due
and payable.  If an Event of Default of the type  described in clause (f) or (g)
above occurs and is  continuing,  then such amount will ipso facto become and be
immediately  due and payable without any declaration or other act on the part of
the Trustee or any Holder.

            At any time after a declaration of acceleration  with respect to the
Notes as  described  in the  preceding  paragraph,  the Holders of a majority in
aggregate  principal  amount of the Notes then  outstanding by written notice to
the Company and the  Trustee  may  rescind and cancel such  declaration  and its
consequences  (a) if the  rescission  would not  conflict  with any  judgment or
decree,  (b) if all existing  Events of Default have been cured or waived except
nonpayment of principal or interest  that has become due solely  because of such
acceleration, (c) to the extent the payment of such interest is lawful, interest
on overdue installments of interest and overdue principal,  which has become due
otherwise than by such  declaration of  acceleration,  has been paid, (d) if the
Issuers have paid the Trustee its  reasonable  compensation  and  reimbursed the
Trustee for its expenses, disbursements and advances and (e) in the event of the
cure or waiver of an Event of Default of the type described in clause (f) or (g)
of the  description of Events of Default above,  the Trustee shall have received
an  Officers'  Certificate  and an Opinion of Counsel that such Event of Default
has been cured or waived;  provided,  however, that such counsel may rely, as to
matters of fact, on a certificate or certificates of officers of the Company. No
such  rescission  shall  affect  any  subsequent  Default  or  impair  any right
consequent thereto.


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            SECTION 6.03.     Other Remedies.

            If an Event of Default  occurs and is  continuing,  the  Trustee may
pursue any  available  remedy by  proceeding  at law or in equity to collect the
payment of the  principal  of,  premium,  if any, or interest on the Notes or to
enforce the performance of any provision of the Notes or this Indenture.

            All rights of action and claims  under this  Indenture  or the Notes
may be enforced  by the Trustee  even if it does not possess any of the Notes or
does not  produce  any of them in the  proceeding.  A delay or  omission  by the
Trustee or any Holder in exercising  any right or remedy  accruing upon an Event
of Default  shall not impair  the right or remedy or  constitute  a waiver of or
acquiescence  in the  Event of  Default.  No remedy  is  exclusive  of any other
remedy. All available remedies are cumulative to the extent permitted by law.

            SECTION 6.04.     Waiver of Past Defaults.

            Prior to the declaration of  acceleration of the Notes,  the Holders
of not less than a  majority  in  aggregate  principal  amount of the Notes then
outstanding  by notice to the  Trustee  may, on behalf of the Holders of all the
Notes, waive any existing Default or Event of Default and its consequences under
this  Indenture,  except a Default  or Event of  Default  specified  in  Section
6.01(a) or (b) or in respect of any provision hereof which cannot be modified or
amended without the consent of the Holder so affected  pursuant to Section 9.02.
When a Default or Event of Default  is so waived,  it shall be deemed  cured and
shall cease to exist. This Section 6.04 shall be in lieu of ss.  316(a)(1)(B) of
the TIA and such ss.  316(a)(1)(B) of the TIA is hereby expressly  excluded from
this Indenture and the Notes, as permitted by the TIA.

            SECTION 6.05.     Control by Majority.

            Holders of the Notes may not  enforce  this  Indenture  or the Notes
except as  provided in this  Article  Six and under the TIA.  The Holders of not
less than a majority in  aggregate  principal  amount of the  outstanding  Notes
shall have the right to direct  the time,  method  and place of  conducting  any
proceeding for any remedy  available to the Trustee,  or exercising any trust or
power conferred on the Trustee,  provided,  however, that the Trustee may refuse
to  follow  any  direction  (a)  that  conflicts  with  any  rule of law or this
Indenture,  (b) that the Trustee  determines  may be unduly  prejudicial  to the
rights of  another  Holder,  or (c) that may  expose  the  Trustee  to  personal
liability for which  reasonable  indemnity  provided to the Trustee against such
liability shall be inadequate;  provided, further, however, that the Trustee may
take any other action deemed proper by the Trustee that is not inconsistent with
such  direction  or this  Indenture.  This  Section 6.05 shall be in lieu of ss.
316(a)(1)(A)  of the  TIA,  and  such  ss.  316(a)(1)(A)  of the  TIA is  hereby
expressly excluded from this Indenture and the Notes, as permitted by the TIA.

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            SECTION 6.06.     Limitation on Suits.

            No  Holder  of any  Notes  shall  have any  right to  institute  any
proceeding with respect to this Indenture or the Notes or any remedy  hereunder,
unless  the  Holders  of at  least  25% in  aggregate  principal  amount  of the
outstanding Notes have made written request,  and offered reasonable  indemnity,
to the Trustee to institute such  proceeding as Trustee under the Notes and this
Indenture,  the Trustee has failed to institute such  proceeding  within 30 days
after  receipt of such notice,  request and offer of indemnity  and the Trustee,
within such 30-day period,  has not received  directions  inconsistent with such
written  request by Holders of not less than a majority in  aggregate  principal
amount of the outstanding Notes.

            The foregoing  limitations shall not apply to a suit instituted by a
Holder  of a Note  for the  enforcement  of the  payment  of the  principal  of,
premium,  if any, or interest on, such Note on or after the respective due dates
expressed or provided for in such Note.

            A Holder may not use this  Indenture to prejudice  the rights of any
other Holders or to obtain priority or preference over such other Holders.

            SECTION 6.07.     Right of Holders To Receive Payment.

            Notwithstanding any other provision in this Indenture,  the right of
any Holder of a Note to receive  payment of the principal of,  premium,  if any,
and interest on such Note,  on or after the  respective  due dates  expressed or
provided  for in such  Note,  or to bring suit for the  enforcement  of any such
payment on or after the respective due dates, is absolute and  unconditional and
shall not be impaired or affected without the consent of the Holder.

            SECTION 6.08.     Collection Suit by Trustee.

            If an Event of  Default  specified  in clause  (a) or (b) of Section
6.01 occurs and is continuing,  the Trustee may recover judgment in its own name
and as trustee of an express trust against the Company,  or any other obligor on
the Notes for the whole amount of the principal of, premium, if any, and accrued
interest  remaining unpaid,  together with interest on overdue principal and, to
the  extent  that  payment  of such  interest  is  lawful,  interest  on overdue
installments of interest, in each case at the rate per annum provided for by the
Notes  and such  further  amount as shall be  sufficient  to cover the costs and
expenses  of  collection,  including  the  reasonable  compensation,   expenses,
disbursements and advances of the Trustee, its agents and counsel.

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            SECTION 6.09.     Trustee May File Proofs of Claim.

            The  Trustee  may file such  proofs  of claim  and  other  papers or
documents  as may be  necessary  or advisable in order to have the claims of the
Trustee  (including  any  claim  for  the  reasonable  compensation,   expenses,
disbursements and advances of the Trustee, its agents, counsel,  accountants and
experts)  and the Holders  allowed in any judicial  proceedings  relative to the
Issuers or Restricted  Subsidiaries (or any other obligor upon the Notes), their
creditors or their  property and shall be entitled and  empowered to collect and
receive any monies or other  property  payable or deliverable on any such claims
and to distribute the same,  and any Custodian in any such judicial  proceedings
is hereby authorized by each Holder to make such payments to the Trustee and, in
the event that the Trustee shall consent to the making of such payments directly
to the  Holders,  to pay to the Trustee any amount due to it for the  reasonable
compensation, expenses, disbursements and advances of the Trustee, its agent and
counsel,  and any other  amounts due the Trustee  under  Section  7.07.  Nothing
herein  contained  shall be deemed to  authorize  the  Trustee to  authorize  or
consent   to  or  accept  or  adopt  on  behalf  of  any   Holder  any  plan  of
reorganization,  arrangement,  adjustment or composition  affecting the Notes or
the rights of any Holder thereof, or to authorize the Trustee to vote in respect
of the claim of any Holder in any such proceeding.

            SECTION 6.10      Priorities.

            If the Trustee  collects  any money  pursuant to this Article Six it
shall pay out such money in the following order:

            First:  to the Trustee for amounts due under Section 7.07;

            Second:  to Holders  for  interest  accrued  on the Notes,  ratably,
      without  preference or priority of any kind,  according to the amounts due
      and payable on the Notes for interest;

            Third: to Holders for the principal amounts  (including any premium)
      owing  under the Notes,  ratably,  without  preference  or priority of any
      kind,  according  to the  amounts  due and  payable  on the  Notes for the
      principal (including any premium); and

            Fourth:  the balance, if any, to the Issuers.

            The Trustee,  upon prior  written  notice to the Issuers,  may fix a
record date and payment date for any payment to Holders pursuant to this Section
6.10.

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            SECTION 6.11.     Undertaking for Costs.

            In any suit for the  enforcement  of any right or remedy  under this
Indenture  or in any suit against the Trustee for any action taken or omitted by
it as  Trustee,  a court may in its  discretion  require the filing by any party
litigant  in the suit of an  undertaking  to pay the costs of the suit,  and the
court in its  discretion  may  assess  reasonable  costs,  including  reasonable
attorneys'  fees,  against any party litigant in the suit,  having due regard to
the merits and good faith of the claims or defenses made by the party  litigant.
This  Section  6.11  does not  apply to any suit by the  Trustee,  any suit by a
Holder  pursuant to Section  6.06, or a suit by a Holder or Holders of more than
10% in aggregate principal amount of the outstanding Notes.

            SECTION 6.12.     Restoration of Rights and Remedies.

            If the  Trustee or any  Holder  has  instituted  any  proceeding  to
enforce any right or remedy under this Indenture or any Note and such proceeding
has been  discontinued  or  abandoned  for any  reason,  or has been  determined
adversely  to the  Trustee  or to such  Holder,  then and in every such case the
Issuers, the Trustee and the Holders shall, subject to any determination in such
proceeding,  be restored  severally and  respectively to their former  positions
hereunder, and thereafter all rights and remedies of the Trustee and the Holders
shall continue as though no such proceeding had been instituted.


                                 ARTICLE SEVEN

                                    TRUSTEE


            SECTION 7.01.     Duties of Trustee.

            (a) If an Event of  Default  has  occurred  and is  continuing,  the
Trustee  shall  exercise  such of the  rights  and  powers  vested in it by this
Indenture and use the same degree of care and skill in its exercise thereof as a
prudent person would exercise or use under the  circumstances  in the conduct of
his own affairs.

            (b)   Except during the continuance of an Event of Default:

            (1) The Trustee need  perform only those duties as are  specifically
      set forth in this  Indenture  and no  covenants  or  obligations  shall be
      implied in this Indenture that are adverse to the Trustee.

            (2) In the  absence  of bad  faith  on its  part,  the  Trustee  may
      conclusively  rely, as to the truth of the statements and the  correctness
      of the opinions expressed therein, upon certificates or opinions furnished
      to the Trustee  and  conforming  to the  requirements  of this  Indenture.
      However, in the case of any such certificates or

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      opinions  that by any  provision  hereof are  specifically  required to be
      furnished to the Trustee,  the Trustee shall examine the  certificates and
      opinions to determine  whether or not they conform to the  requirements of
      this Indenture.

            (c) Notwithstanding  anything to the contrary herein contained,  the
Trustee may not be relieved from liability for its own negligent action, its own
negligent failure to act, or its own willful misconduct, except that:

            (1) This  paragraph  does not limit the effect of  paragraph  (b) of
      this Section 7.01.

            (2) The Trustee  shall not be liable for any error of judgment  made
      in good faith by a Trust Officer, unless it is proved that the Trustee was
      negligent in ascertaining the pertinent facts.

            (3) The Trustee  shall not be liable  with  respect to any action it
      takes or  omits  to take in good  faith  in  accordance  with a  direction
      received by it pursuant to Section 6.02, 6.04 or 6.05.

            (d) No  provision  of this  Indenture  shall  require the Trustee to
expend or risk its own funds or otherwise  incur any financial  liability in the
performance  of any of its duties  hereunder  or in the  exercise  of any of its
rights  or  powers  if it shall  have  reasonable  grounds  for  believing  that
repayment of such funds or adequate  indemnity against such risk or liability is
not reasonably assured to it.

            (e) Every provision of this Indenture that in any way relates to the
Trustee is subject to paragraphs  (a), (b), (c) and (d) of this Section 7.01 and
Section 7.02.

            (f) The  Trustee  shall not be liable for  interest  on any money or
assets  received  by it except as the  Trustee  may  agree in  writing  with the
Issuers.  Assets held in trust by the Trustee need not be segregated  from other
assets except to the extent required by law.

            SECTION 7.02.  Rights of Trustee.

            Subject to Section 7.01:

            (a) The Trustee may rely and shall be fully  protected  in acting or
      refraining from acting upon any document  believed by it to be genuine and
      to have been signed or  presented by the proper  Person.  The Trustee need
      not investigate any fact or matter stated in the document.

            (b) Before the Trustee acts or refrains from acting,  it may consult
      with counsel of its selection and may require an Officers'  Certificate or
      an Opinion of Counsel,  which shall  conform to Sections  10.04 and 10.05.
      The  Trustee  shall not be liable for any action it takes or omits to take
      in good faith in reliance on such

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      Officers' Certificate or Opinion of Counsel.

            (c) The Trustee may act through its  attorneys  and agents and shall
      not be responsible for the misconduct or negligence of any agent appointed
      with due care.

            (d) The Trustee  shall not be liable for any action that it takes or
      omits to take in good faith which it reasonably  believes to be authorized
      or within its rights or powers.

            (e) The Trustee  shall not be bound to make any  investigation  into
      the facts or matters  stated in any  resolution,  certificate,  statement,
      instrument,  opinion,  notice, request,  direction,  consent, order, bond,
      debenture, or other paper or document, but the Trustee, in its discretion,
      may make such further inquiry or investigation  into such facts or matters
      as it may see fit,  and,  if the  Trustee  shall  determine  to make  such
      further inquiry or  investigation,  it shall be entitled,  upon reasonable
      notice to the Issuers, to examine the books,  records, and premises of the
      Issuers,  personally  or by  agent or  attorney  and to  consult  with the
      officers  and  representatives  of the  Issuers,  including  the  Issuers'
      accountants and attorneys.

             (f) The Trustee shall be under no obligation to exercise any of the
      rights or powers vested in it by this  Indenture at the request,  order or
      direction  of any of the  Holders  pursuant  to  the  provisions  of  this
      Indenture,  unless such Holders shall have offered to the Trustee security
      or indemnity  reasonably  satisfactory  to the Trustee  against the costs,
      expenses and  liabilities  which may be incurred by it in compliance  with
      such request, order or direction.

            (g) The Trustee  shall not be required to give any bond or surety in
      respect of the performance of its powers and duties hereunder.

            (h) Delivery of reports,  information  and  documents to the Trustee
      under  Section 4.08 is for  informational  purposes only and the Trustee's
      receipt of the foregoing shall not constitute  constructive  notice of any
      information  contained therein or determinable from information  contained
      therein,  including the Issuers'  compliance  with any of their  covenants
      hereunder  (as to which the  Trustee is entitled  to rely  exclusively  on
      Officers' Certificates).

            SECTION 7.03.     Individual Rights of Trustee.

            The Trustee in its  individual or any other  capacity may become the
owner or pledgee of Notes and may otherwise deal with the Issuers,  any of their
Subsidiaries,  or their respective Affiliates with the same rights it would have
if it were not Trustee. Any Agent may do the same with like rights. However, the
Trustee must comply with Sections 7.10 and 7.11.

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            SECTION 7.04.     Trustee's Disclaimer.

            The Trustee makes no  representation  as to the validity or adequacy
of this Indenture or the Notes, and it shall not be accountable for the Issuers'
use of the  proceeds  from the Notes,  and it shall not be  responsible  for any
statement of the Issuers in this Indenture or the Notes other than the Trustee's
certificate of authentication.

            SECTION 7.05.     Notice of Default.

            If a Default or an Event of Default  occurs and is continuing and if
it is known to a Trust Officer,  the Trustee shall mail to each Holder notice of
the uncured Default or Event of Default within 90 days after obtaining knowledge
thereof.  Except in the case of a Default  or an Event of  Default in payment of
principal  of, or interest on, any Note,  including an  accelerated  payment,  a
Default in payment on the Change of Control Payment Date pursuant to a Change of
Control  Offer or on the Net  Proceeds  Offer  Payment  Date  pursuant  to a Net
Proceeds Offer and a Default in compliance with Article Five hereof, the Trustee
may withhold the notice if and so long as its Board of Directors,  the executive
committee of its Board of Directors or a committee of its directors and/or Trust
Officers in good faith determines that withholding the notice is in the interest
of the Holders.  The foregoing sentence of this Section 7.05 shall be in lieu of
the proviso to ss.  315(b) of the TIA and such proviso to ss.  315(b) of the TIA
is hereby expressly  excluded from this Indenture and the Notes, as permitted by
the TIA.

            SECTION 7.06.     Reports by Trustee to Holders.

            Within 60 days after  November 1 of each year  beginning  with 1997,
the Trustee  shall,  to the extent that any of the events  described  in TIA ss.
313(a) occurred within the previous  twelve months,  but not otherwise,  mail to
each  Holder a brief  report  dated as of such date that  complies  with TIA ss.
313(a). The Trustee also shall comply with TIA ss.ss. 313(b), (c) and (d).

            A copy of each report at the time of its mailing to Holders shall be
mailed to the Issuers and filed with the Commission and each stock exchange,  if
any, on which the Notes are listed.

            The Issuers  shall  promptly  notify the Trustee if the Notes become
listed on any stock exchange and the Trustee shall comply with TIA ss. 313(d).

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            SECTION 7.07.     Compensation and Indemnity.

            The  Issuers  shall  pay to the  Trustee  from  time  to  time  such
compensation  for its  services as has been  agreed to in writing  signed by the
Issuers and the Trustee. The Trustee's  compensation shall not be limited by any
law on  compensation  of a  trustee  of an  express  trust.  The  Issuers  shall
reimburse  the Trustee upon request for all  reasonable  out-of-pocket  expenses
incurred or made by it in connection  with the  performance  of its duties under
this Indenture.  Such expenses shall include the reasonable fees and expenses of
the Trustee's agents, counsel, accountants and experts.

            The Issuers shall  indemnify each of the Trustee (or any predecessor
Trustee) and its agents, employees,  stockholders,  Affiliates and directors and
officers for, and hold them each harmless against, any and all loss,  liability,
damage,  claim or expense  (including  reasonable fees and expenses of counsel),
including  taxes (other than taxes based on the income of the Trustee)  incurred
by them  except for such  actions to the extent  caused by any  negligence,  bad
faith or willful  misconduct on their part, arising out of or in connection with
the acceptance or  administration  of this trust including the reasonable  costs
and  expenses  of  defending  themselves  against  any  claim  or  liability  in
connection  with the exercise or performance  of any of their rights,  powers or
duties  hereunder.  The Trustee  shall notify the Issuers  promptly of any claim
asserted  against the Trustee for which it may seek indemnity.  At the Trustee's
sole  discretion,  the  Issuers  shall  defend the claim and the  Trustee  shall
cooperate  and may  participate  in the  defense;  provided,  however,  that any
settlement  of a claim  shall be  approved  in  writing  by the  Trustee if such
settlement  would  result in an admission of liability by the Trustee or if such
settlement  would not be  accompanied  by a full  release of the Trustee for all
liability  arising out of the events  giving rise to such claim.  Alternatively,
the Trustee may at its option have separate  counsel of its own choosing and the
Issuers shall pay the reasonable fees and expenses of such counsel.

            To secure the Issuers' payment obligations in this Section 7.07, the
Trustee  shall  have a lien  prior to the Notes on all  assets or money  held or
collected by the Trustee,  in its  capacity as Trustee,  except  assets or money
held in trust to pay principal of or premium,  if any, or interest on particular
Notes.

            When the Trustee incurs expenses or renders  services after an Event
of Default  specified in Section  6.01(f) or (g) occurs,  such  expenses and the
compensation   for  such  services  are  intended  to  constitute   expenses  of
administration under any Bankruptcy Law.

            The provisions of this Section 7.07 shall survive the termination of
this Indenture.

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            SECTION 7.08.     Replacement of Trustee.

            The Trustee may resign at any time by so notifying the Issuers.  The
Holders of a majority in principal  amount of the  outstanding  Notes may remove
the Trustee and appoint a successor  Trustee  with the Issuers'  consent,  by so
notifying the Issuers and the Trustee. The Issuers may remove the Trustee if:

            (1)   the Trustee fails to comply with Section 7.10;

            (2)   the Trustee is adjudged bankrupt or insolvent;

            (3) a receiver or other public  officer  takes charge of the Trustee
      or its property; or

            (4)   the Trustee becomes incapable of acting.

            If the Trustee  resigns or is removed or if a vacancy  exists in the
office of Trustee for any reason,  the Issuers  shall notify each Holder of such
event and shall promptly appoint a successor Trustee.  Within one year after the
successor Trustee takes office, the Holders of a majority in aggregate principal
amount of the outstanding  Notes may appoint a successor  Trustee to replace the
successor Trustee appointed by the Issuers.

            A  successor  Trustee  shall  deliver  a written  acceptance  of its
appointment to the retiring Trustee and to the Issuers.  Immediately after that,
the retiring  Trustee  shall  transfer all property held by it as Trustee to the
successor Trustee, subject to the lien provided in Section 7.07, the resignation
or removal of the retiring  Trustee  shall become  effective,  and the successor
Trustee  shall have all the rights,  powers and duties of the Trustee under this
Indenture. The Issuers shall mail notice of such successor Trustee's appointment
to each Holder.

            If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Issuers or the
Holders of at least 10% in aggregate  principal amount of the outstanding  Notes
may  petition  any court of  competent  jurisdiction  for the  appointment  of a
successor Trustee.

            If the Trustee  fails to comply with  Section  7.10,  any Holder may
petition any court of competent  jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee.

            Notwithstanding  any  resignation  or  replacement  of  the  Trustee
pursuant to this Section 7.08, the Issuers' obligations under Section 7.07 shall
continue for the benefit of the retiring Trustee.

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            SECTION 7.09.     Successor Trustee by Merger, Etc.

            If the  Trustee  consolidates  with,  merges or  converts  into,  or
transfers all or  substantially  all of its corporate trust business to, another
corporation,  the  resulting,  surviving or transferee  corporation  without any
further act shall,  if such  resulting,  surviving or transferee  corporation is
otherwise eligible hereunder, be the successor Trustee; provided,  however, that
such  corporation  shall be otherwise  qualified and eligible under this Article
Seven.

            SECTION 7.10      Eligibility; Disqualification.

            This  Indenture  shall  always  have a  Trustee  who  satisfies  the
requirement of TIA ss.ss.  310(a)(1),  (2) and (5). The Trustee (or, in the case
of a Trustee that is a corporation  included in a bank holding  company  system,
the related bank holding  company) shall have a combined  capital and surplus of
at least $150 million as set forth in its most recent published annual report of
condition,  and  have a  Corporate  Trust  Office  in the City of New  York.  In
addition,  if the Trustee is a  corporation  included in a bank holding  company
system, the Trustee,  independently of such bank holding company, shall meet the
capital requirements of TIA ss. 310(a)(2). The Trustee shall comply with TIA ss.
310(b);  provided,  however,  that there shall be excluded from the operation of
TIA ss. 310(b)(1) any indenture or indentures under which other  securities,  or
certificates of interest or  participation in other  securities,  of the Issuers
are  outstanding,  if the  requirements  for such exclusion set forth in TIA ss.
310(b)(1) are met. The provisions of TIA ss. 310 shall apply to the Company,  as
obligors of the Notes.

            SECTION 7.11      Preferential Collection of
                              Claims Against Issuers.

            The Trustee shall comply with TIA ss. 311(a), excluding any creditor
relationship  listed in TIA ss.  311(b).  A  Trustee  who has  resigned  or been
removed shall be subject to TIA ss. 311(a) to the extent indicated therein.  The
provisions of TIA ss. 311 shall apply to the Issuers, as obligors on the Notes.


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                                 ARTICLE EIGHT

                      DISCHARGE OF INDENTURE; DEFEASANCE


            SECTION 8.01      Termination of Issuers' Obligations.

            This  Indenture  will be discharged  and will cease to be of further
effect (except as to surviving rights of registration of transfer or exchange of
the Notes,  as expressly  provided for in this  Indenture) as to all outstanding
Notes when (a) either (i) all Notes,  theretofore  authenticated  and  delivered
(except  lost,  stolen or destroyed  Notes which have been  replaced or paid and
Notes for  whose  payment  money  has  theretofore  been  deposited  in trust or
segregated and held in trust by the Issuers and thereafter repaid to the Issuers
or  discharged  from  such  trust)  have  been  delivered  to  the  Trustee  for
cancellation  or (ii) all Notes not  theretofore  delivered  to the  Trustee for
cancellation  have  become due and  payable  and the  Issuers  have  irrevocably
deposited  or  caused  to be  deposited  with the  Trustee  funds  in an  amount
sufficient  to pay and  discharge  the  entire  Indebtedness  on the  Notes  not
theretofore  delivered  to the  Trustee  for  cancellation,  for  principal  of,
premium,  if any, and interest on the Notes to the date of deposit together with
irrevocable  instructions  from the Issuers  directing the Trustee to apply such
funds to the payment thereof at maturity or redemption,  as the case may be; (b)
the  Issuers  have paid all other  sums  payable  under  this  Indenture  by the
Issuers;  and (c)  the  Issuers  have  delivered  to the  Trustee  an  officers'
certificate  and an opinion of counsel  stating  that all  conditions  precedent
under  this  Indenture  relating  to the  satisfaction  and  discharge  of  this
Indenture  have been complied  with;  provided,  however,  that such counsel may
rely, as to matters of fact, on a certificate or certificates of officers of the
Issuers.

            The  Issuers  may,  at their  option and at any time,  elect to have
their obligations and the corresponding obligations of the Subsidiary Guarantors
discharged  with respect to the  outstanding  Notes ("Legal  Defeasance").  Such
Legal  Defeasance  means  that the  Issuers  shall be  deemed  to have  paid and
discharged the entire  indebtedness  represented by the outstanding  Notes,  and
satisfied all of their obligations with respect to the Notes, except for (a) the
rights of Holders to receive  payments in respect of the principal of,  premium,
if any, and  interest on the Notes when such  payments are due, (b) the Issuers'
obligations  with  respect  to the Notes  concerning  issuing  temporary  Notes,
registration  of  Notes,  mutilated,  destroyed,  lost or  stolen  Notes and the
maintenance of an office or agency for payments,  (c) the rights, powers, trust,
duties and immunities of the Trustee and the Issuers'  obligations in connection
therewith  and (d) the Legal  Defeasance  provisions  of this Section  8.01.  In
addition,  the Issuers may, at their  option and at any time,  elect to have the
obligations of the Issuers and the Subsidiary Guarantors,  if any, released with
respect to covenants  contained in Sections 4.04, 4.08 and 4.10 through 4.20 and
Article Five ("Covenant  Defeasance") and thereafter any omission to comply with
such obligations shall not constitute a Default or Event of Default with respect
to the Notes. In the event of Covenant Defeasance,  those events described under
Section 6.01 (except those events described in Section  6.01(a),(b),(f) and (g))
will no longer constitute an Event of Default with respect to the Notes.


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            In order to exercise either Legal Defeasance or Covenant Defeasance:

            (a) the Issuers must irrevocably deposit with the Trustee, in trust,
      for the benefit of the Holders cash in United States dollars, non-callable
      U.S. Government Obligations,  or a combination thereof, in such amounts as
      will be  sufficient,  in the opinion of a  nationally  recognized  firm of
      independent public accountants,  to pay the principal of, premium, if any,
      and interest on the Notes on the stated date for payment thereof or on the
      applicable Redemption Date, as the case may be;

            (b)  in the  case  of  Legal  Defeasance,  the  Issuers  shall  have
      delivered  to the  Trustee an  opinion  of  counsel  in the United  States
      reasonably  acceptable to the Trustee confirming that (i) the Issuers have
      received  from,  or there has been  published  by,  the  Internal  Revenue
      Service a ruling or (ii) since the date of this Indenture,  there has been
      a change in the  applicable  federal income tax law, in either case to the
      effect that, and based thereon such opinion of counsel shall confirm that,
      the Holders will not recognize income, gain or loss for federal income tax
      purposes  as a result of such  Legal  Defeasance  and will be  subject  to
      federal income tax on the same amounts, in the same manner and at the same
      times  as  would  have  been the  case if such  Legal  Defeasance  had not
      occurred;

            (c) in the case of  Covenant  Defeasance,  the  Issuers  shall  have
      delivered  to the  Trustee an  opinion  of  counsel  in the United  States
      reasonably  acceptable to the Trustee confirming that the Holders will not
      recognize income, gain or loss for federal income tax purposes as a result
      of such Covenant  Defeasance  and will be subject to federal income tax on
      the same  amounts,  in the same manner and at the same times as would have
      been the case if such Covenant Defeasance had not occurred;

            (d) no  Default  or Event of  Default  shall  have  occurred  and be
      continuing  on the date of such  deposit  or  insofar as Events of Default
      under Section  6.01(f) or (g) from  bankruptcy  or  insolvency  events are
      concerned, at any time in the period ending on the 91st day after the date
      of deposit;

            (e) such Legal Defeasance or Covenant Defeasance shall not result in
      a breach or violation of, or constitute a default under this  Indenture or
      any other  agreement  or  instrument  to which the  Company  or any of its
      Restricted  Subsidiaries  is a party or by which the Company or any of its
      Restricted Subsidiaries is bound;

            (f) the Issuers  shall have  delivered  to the Trustee an  officers'
      certificate  stating that the deposit was not made by the Issuers with the
      intent of preferring the Holders over any other creditors of either Issuer
      or with the intent of defeating,  hindering,  delaying or  defrauding  any
      other creditors of the Issuers or others;

            (g) the Issuers  shall have  delivered  to the Trustee an  Officers'
      Certificate  and an Opinion of Counsel,  each stating that all  conditions
      precedent provided for or relating to the Legal Defeasance or the Covenant
      Defeasance,  as the  case  may be,  have  been  complied  with;  provided,
    
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      however,  that  such  counsel  may  rely,  as to  matters  of  fact,  on a
      certificate or certificates of officers of the Issuers;

            (h) the Issuers  shall have  delivered  to the Trustee an Opinion of
      Counsel to the effect that after the 91st day following  the deposit,  the
      trust  funds  will  not  be  subject  to  the  effect  of  any  applicable
      bankruptcy,   insolvency,   reorganization   or  similar  laws   affecting
      creditors' rights generally; and

            (i)   certain other customary conditions precedent are satisfied.

            SECTION 8.02.     Application of Trust Money.

            The Trustee or Paying Agent shall hold in trust U.S. Legal Tender or
U.S.  Government  Obligations  deposited  with it pursuant to Section 8.01,  and
shall apply the deposited U.S.  Legal Tender and the money from U.S.  Government
Obligations in accordance with this Indenture to the payment of the principal of
and interest on the Notes.  The Trustee  shall be under no  obligation to invest
said U.S. Legal Tender or U.S. Government  Obligations except as it may agree in
writing with the Issuers.

            The Issuers shall pay and indemnify the Trustee against any tax, fee
or other  charge  imposed  on or  assessed  against  the  Legal  Tender  or U.S.
Government  Obligations  deposited pursuant to Section 8.01 or the principal and
interest  received  in respect  thereof  other  than any such tax,  fee or other
charge which by law is for the account of the Holders of outstanding Notes.

            SECTION 8.03.     Repayment to the Issuers.

            Subject to Section  8.01,  the  Trustee  and the Paying  Agent shall
promptly pay to the Issuers  upon  request any excess U.S.  Legal Tender or U.S.
Government  Obligations held by them at any time and thereupon shall be relieved
from all liability with respect to such money.  The Trustee and the Paying Agent
shall pay to the Issuers  upon request any money held by them for the payment of
principal or interest that remains  unclaimed for one year;  provided,  however,
that the  Trustee  or such  Paying  Agent,  before  being  required  to make any
payment,  may at the  expense of the  Issuers  cause to be  published  once in a
newspaper of general  circulation in the City of New York or mail to each Holder
entitled to such money notice that such money remains unclaimed and that after a
date  specified  therein  which  shall be at least 30 days from the date of such
publication  or mailing any unclaimed  balance of such money then remaining will
be repaid to the Issuers. After payment to the Issuers, Holders entitled to such
money  must look to the  Issuers  for  payment as  general  creditors  unless an
applicable law designates another Person.

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            SECTION 8.04.     Reinstatement.

            If the  Trustee  or Paying  Agent is unable to apply any U.S.  Legal
Tender or U.S. Government  Obligations in accordance with Section 8.01 by reason
of any legal  proceeding  or by reason of any order or  judgment of any court or
governmental  authority  enjoining,  restraining or otherwise  prohibiting  such
application,  the Issuers'  obligations under this Indenture and the Notes shall
be revived and reinstated as though no deposit had occurred  pursuant to Section
8.01 until such time as the Trustee or Paying  Agent is  permitted  to apply all
such U.S. Legal Tender or U.S. Government Obligations in accordance with Section
8.01; provided,  however,  that if the Issuers have made any payment of interest
on or principal of any Notes because of the reinstatement of their  obligations,
the Issuers  shall be  subrogated  to the rights of the Holders of such Notes to
receive such payment from the U.S. Legal Tender or U.S.  Government  Obligations
held by the Trustee or Paying Agent.

            SECTION 8.05.     Acknowledgment of Discharge by Trustee.

            After (i) the conditions of Section 8.01 have been  satisfied,  (ii)
the Issuers have paid or caused to be paid all other sums  payable  hereunder by
the  Issuers  and (iii) each of the  Issuers  has  delivered  to the  Trustee an
Officers'  Certificate  and  an  Opinion  of  Counsel,  each  stating  that  all
conditions   precedent   referred  to  in  clause  (i)  above  relating  to  the
satisfaction  and  discharge of this  Indenture  have been  complied  with,  the
Trustee upon request shall  acknowledge in writing the discharge of the Issuers'
obligations  under  this  Indenture  except  for  those  surviving   obligations
specified in Section 8.01, provided the legal counsel delivering such Opinion of
Counsel may rely as to matters of fact on one or more Officers'  Certificates of
the Issuers.


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                                 ARTICLE NINE

                         MODIFICATION OF THE INDENTURE


            SECTION 9.01.     Without Consent of Holders.

            Subject  to  the  provisions  of  Section  9.02,  the  Issuers,  the
Subsidiary  Guarantors  and the  Trustee  may amend,  waive or  supplement  this
Indenture without notice to or consent of any Holder: (a) to cure any ambiguity,
defect or inconsistency;  (b) to comply with Section 5.01 of this Indenture; (c)
to provide for  uncertificated  Notes in addition to certificated  Notes; (d) to
comply with any  requirements  of the  Commission in order to effect or maintain
the  qualification  of this  Indenture  under the TIA; or (e) to make any change
that would provide any additional  benefit or rights to the Holders or that does
not adversely  affect the rights of any Holder.  Notwithstanding  the foregoing,
the Trustee and the Issuers may not make any change that  adversely  affects the
rights of any Holder under this Indenture without the consent of such Holder. In
formulating its opinion on such matters, the Trustee will be entitled to rely on
such evidence as it deems appropriate,  including, without limitation, solely on
an Opinion of Counsel;  provided,  however,  that in delivering  such Opinion of
Counsel,  such  counsel  may rely as to matters  of fact,  on a  certificate  or
certificates of officers of the Company.

            SECTION 9.02.     With Consent of Holders.

            All other modifications and amendments of this Indenture may be made
with the consent of the Holders of a majority in the then outstanding  principal
amount of the then outstanding  Notes,  except that, without the consent of each
Holder of the Notes affected thereby,  no amendment may, directly or indirectly:
(i) reduce the amount of Notes whose Holders must consent to any amendment; (ii)
reduce  the rate of or  change  the  time for  payment  of  interest,  including
defaulted  interest,  on any Notes;  (iii) reduce the principal of or change the
fixed  maturity  of any  Notes,  or  change  the date on which  any Notes may be
subject to  redemption  or  repurchase,  or reduce the  redemption or repurchase
price  therefor;  (iv) make any Notes payable in money other than that stated in
the Notes;  (v) make any change in provisions of this  Indenture  protecting the
right of each Holder of a Note to receive  payment of  principal of and interest
on such Note on or after the due date  thereof or to bring suit to enforce  such
payment or permitting Holders of a majority in aggregate principal amount of the
then  outstanding  Notes to waive  Defaults  or Events of  Default;  (vi) amend,
change or modify in any material  respect the  obligation of the Issuers to make
and  consummate a Change of Control Offer in the event of a Change of Control or
make and consummate a Net Proceeds Offer with respect to any Asset Sale that has
been  consummated or modify any of the  provisions or  definitions  with respect
thereto;  (vii) modify or change any provision of this Indenture or Section 1.01
affecting the ranking of the Notes or any Guarantee in a manner which  adversely
affects the Holders; or (viii) release any Subsidiary  Guarantor from any of its
obligations  under its Guarantee or this Indenture  otherwise than in accordance
with the terms of this Indenture.

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            SECTION 9.03.     Compliance with TIA.

            Every amendment, waiver or supplement of this Indenture or the Notes
shall  comply  with the TIA as then in  effect;  provided,  however,  that  this
Section 9.03 shall not of itself  require that this  Indenture or the Trustee be
qualified  under the TIA or constitute  any admission or  acknowledgment  by any
party  hereto that any such  qualification  is  required  prior to the time this
Indenture and the Trustee are required by the TIA to be so qualified.

            SECTION 9.04.     Revocation and Effect of Consents.

            Until an  amendment,  waiver  or  supplement  becomes  effective,  a
consent  to it by a Holder  is a  continuing  consent  by the  Holder  and every
subsequent Holder of a Note or portion of a Note that evidences the same debt as
the consenting Holder's Note, even if notation of the consent is not made on any
Note. Subject to the following  paragraph,  any such Holder or subsequent Holder
may  revoke  the  consent  as to such  Holder's  Note or portion of such Note by
notice to the  Trustee  or the  Issuers  received  before  the date on which the
Trustee  receives an Officers'  Certificate  certifying  that the Holders of the
requisite  principal amount of Notes have consented (and not theretofore revoked
such consent) to the amendment,  supplement or waiver. An amendment,  supplement
or waiver  becomes  effective  upon  receipt by the  Trustee  of such  Officers'
Certificate  and evidence of consent by the Holders of the requisite  percentage
in principal amount of outstanding Notes.

            The Issuers may,  but shall not be  obligated  to, fix a Record Date
for the purpose of determining the Holders entitled to consent to any amendment,
supplement  or waiver,  which Record Date shall be at least 30 days prior to the
first   solicitation  of  such  consent.   If  a  Record  Date  is  fixed,  then
notwithstanding  the second  sentence of the  immediately  preceding  paragraph,
those  Persons who were  Holders at such  Record Date (or their duly  designated
proxies),  and only those  Persons,  shall be  entitled  to revoke  any  consent
previously given,  whether or not such Persons continue to be Holders after such
Record Date.  No such consent  shall be valid or effective for more than 90 days
after such Record Date unless consents from Holders of the requisite  percentage
in  principal   amount  of  outstanding   Notes   required   hereunder  for  the
effectiveness of such consents shall have also been given and not revoked within
such 90 day period.

            SECTION 9.05.     Notation on or Exchange of Notes.

            If an amendment,  supplement or waiver  changes the terms of a Note,
the Trustee  may  require the Holder of such Note to deliver it to the  Trustee.
The  Trustee  may place an  appropriate  notation  on the Note about the changed
terms and return it to the Holder. Alternatively,  if the Issuers or the Trustee
so  determine,  the Issuers in exchange for the Note shall issue and the Trustee
shall authenticate a new Note that reflects the changed terms.

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            SECTION 9.06.     Trustee To Sign Amendments, Etc.

            The  Trustee  shall  execute  any  amendment,  supplement  or waiver
authorized pursuant to this Article Nine;  provided,  however,  that the Trustee
may, but shall not be obligated to,  execute any such  amendment,  supplement or
waiver which affects the Trustee's own rights,  duties or immunities  under this
Indenture.  In executing such supplement or waiver the Trustee shall be entitled
to receive indemnity reasonably satisfactory to it, and shall be fully protected
in  relying  upon an Opinion of Counsel  and an  Officers'  Certificate  of each
Issuer,  each stating  that no event of default  shall occur as a result of such
amendment,  supplement  or  waiver  and that  the  execution  of any  amendment,
supplement or waiver  authorized  pursuant to this Article Nine is authorized or
permitted by this Indenture,  provided the legal counsel delivering such Opinion
of Counsel may rely as to matters of fact on one or more Officers'  Certificates
of the Issuers. Such Opinion of Counsel shall not be an expense of the Trustee.


                                  ARTICLE TEN

                                 MISCELLANEOUS


            SECTION 10.01.  TIA Controls.

            If any provision of this Indenture limits,  qualifies,  or conflicts
with another provision which is required to be included in this Indenture by the
TIA, the required provision shall control; provided,  however, that this Section
10.01  shall not of  itself  require  that  this  Indenture  or the  Trustee  be
qualified  under the TIA or constitute  any admission or  acknowledgment  by any
party  hereto that any such  qualification  is  required  prior to the time this
Indenture and the Trustee are required by the TIA to be so qualified.

            SECTION 10.02.  Notices.

            Any notices or other communications  required or permitted hereunder
shall be in writing,  and shall be sufficiently  given if made by hand delivery,
by telex, by telecopier or registered or certified mail, postage prepaid, return
receipt requested, addressed as follows:


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            if to the Issuers:

                  c/o Abraxas Petroleum Corporation
                  500 North Loop 1604 East
                  Suite 100
                  San Antonio, Texas  78232
                  Telecopier Number:  (210) 490-8816

                  Attn:  Chief Executive Officer

            if to the Trustee:

                  IBJ Schroder Bank & Trust Company
                  One State Street
                  Eleventh Floor
                  New York, New York  10004

                  Telecopier Number:  (212) 858-2952
                  Attention:  Corporate Trust Trustee
                                Administration

            Each of the Issuers  and the Trustee by written  notice to the other
may designate  additional or different addresses for notices to such Person. Any
notice or  communication  to the Issuers or the Trustee  shall be deemed to have
been given or made as of the date so delivered if hand delivered;  when answered
back, if telexed; when receipt is acknowledged,  if faxed; and five (5) calendar
days after  mailing if sent by  registered or certified  mail,  postage  prepaid
(except  that a notice  of change  of  address  shall not be deemed to have been
given until actually received by the addressee).

            Any notice or  communication  mailed to a Holder  shall be mailed to
him by first class mail or other  equivalent  means at his address as it appears
on the  registration  books of the Registrar ten (10) days prior to such mailing
and shall be sufficiently given to him if so mailed within the time prescribed.

            Failure to mail a notice or  communication to a Holder or any defect
in it shall not affect its  sufficiency  with  respect  to other  Holders.  If a
notice or  communication  is mailed in the  manner  provided  above,  it is duly
given, whether or not the addressee receives it.

            SECTION 10.03.  Communications by Holders
                               with Other Holders.

            Holders  may  communicate  pursuant  to TIA ss.  312(b)  with  other
Holders  with respect to their  rights  under this  Indenture or the Notes.  The
Issuers,  the  Trustee,  the  Registrar  and any  other  Person  shall  have the
protection of TIA ss. 312(c).

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            SECTION 10.04.     Certificate and Opinion as
                               to Conditions Precedent.

            Upon any  request or  application  by the  Issuers to the Trustee to
take any action under this Indenture, the Issuers shall furnish to the Trustee:

            (1) an Officers' Certificate,  in form and substance satisfactory to
      the Trustee,  stating that, in the opinion of the signers,  all conditions
      precedent to be performed  by the  Issuers,  if any,  provided for in this
      Indenture relating to the proposed action have been complied with; and

            (2) an Opinion  of  Counsel  stating  that,  in the  opinion of such
      counsel,  all such conditions precedent to be performed by the Issuers, if
      any,  provided for in this Indenture  relating to the proposed action have
      been complied with (which counsel,  as to factual matters,  may rely on an
      Officers' Certificate).

            SECTION 10.05.     Statements Required in
                               Certificate or Opinion.

            Each  certificate  or  opinion  with  respect to  compliance  with a
condition or covenant  provided for in this Indenture,  other than the Officers'
Certificate required by Section 4.06, shall include:

            (1) a statement  that the Person making such  certificate or opinion
      has read such covenant or condition;

            (2) a brief  statement as to the nature and scope of the examination
      or investigation  upon which the statements or opinions  contained in such
      certificate or opinion are based;

            (3) a statement  that,  in the opinion of such  Person,  he has made
      such examination or investigation as is reasonably necessary to enable him
      to express an  informed  opinion  as to  whether or not such  covenant  or
      condition has been complied with; and

            (4) a  statement  as to whether or not,  in the opinion of each such
      Person, such condition or covenant has been complied with.

            SECTION 10.06.     Rules by Trustee, Paying
                               Agent, Registrar.

            The  Trustee  may  make  reasonable  rules  in  accordance  with the
Trustee's  customary  practices  for action by or at a meeting of  Holders.  The
Paying Agent or Registrar may make reasonable rules for its functions.

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            SECTION 10.07.  Legal Holidays.

            A "Legal Holiday" used with respect to a particular place of payment
is a Saturday,  a Sunday or a day on which banking institutions in New York, New
York or at such place of payment are not required to be open.  If a payment date
is a Legal Holiday at such place,  payment may be made at such place on the next
succeeding day that is not a Legal Holiday, and no interest shall accrue for the
intervening period.

            SECTION 10.08.  Governing Law.

            THIS  INDENTURE  AND THE NOTES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE
AND  PERFORMED  WITHIN THE STATE OF NEW YORK,  WITHOUT  REGARD TO  PRINCIPLES OF
CONFLICT OF LAWS. Each of the
parties hereto agrees to submit to the  jurisdiction  of the courts of the State
of New York in any  action or  proceeding  arising  out of or  relating  to this
Indenture.

            SECTION 10.09.  No Adverse Interpretation
                               of Other Agreements.

            This Indenture may not be used to interpret another indenture,  loan
or debt  agreement  of  either  Issuer  or any of their  Subsidiaries.  Any such
indenture, loan or debt agreement may not be used to interpret this Indenture.

            SECTION 10.10.  No Personal Liability.

            No director,  officer,  employee or stockholder,  as such, of either
Issuer or any Subsidiary  Guarantor,  as such,  shall have any liability for any
obligations of either Issuer or any Subsidiary  Guarantor under the Notes,  this
Indenture,  the Guarantees or the Registration Rights Agreement or for any claim
based on, in respect of, or by reason of, such  obligations  or their  creation.
Each Holder of Notes by accepting a Note waives and releases all such liability.
The waiver and release  are part of the  consideration  for the  issuance of the
Notes.

            SECTION 10.11.  Successors.

            All  agreements of the Issuers in this Indenture and the Notes shall
bind their  successors.  All agreements of the Trustee in this  Indenture  shall
bind its successors.

            SECTION 10.12.  Duplicate Originals.

            All  parties may sign any number of copies of this  Indenture.  Each
signed copy shall be an original,  but all of them together shall  represent the
same agreement.

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            SECTION 10.13.  Severability.

            In case any one or more of the  provisions  in this  Indenture or in
the Notes shall be held invalid,  illegal or  unenforceable,  in any respect for
any reason,  the validity,  legality and enforceability of any such provision in
every other  respect  and of the  remaining  provisions  shall not in any way be
affected or  impaired  thereby,  it being  intended  that all of the  provisions
hereof shall be enforceable to the full extent permitted by law.

            SECTION 10.14.  Independence of Covenants.

            All covenants and  agreements in this  Indenture and the Notes shall
be given independent effect so that if any particular action or condition is not
permitted  by any of such  covenants,  the fact that it would be permitted by an
exception to, or otherwise be within the limitations of, another  covenant shall
not avoid the  occurrence  of a Default or an Event of Default if such action is
taken or condition exists.


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                                ARTICLE ELEVEN

                              GUARANTEE OF NOTES


            SECTION 11.01.  Unconditional Guarantee.

            Subject to the provisions of this Article  Eleven,  each  Subsidiary
Guarantor,   if  any,  hereby,   jointly  and  severally,   unconditionally  and
irrevocably  guarantees,  on a senior  basis (such  guarantee  to be referred to
herein as a "Guarantee") to each Holder of a Note authenticated and delivered by
the Trustee and to the Trustee and its successors and assigns,  irrespective  of
the validity and enforceability of this Indenture,  the Notes or the obligations
of the Issuers or any other Subsidiary  Guarantors to the Holders or the Trustee
hereunder or  thereunder,  that:  (a) the  principal  of,  premium,  if any, and
interest on the Notes (and any  Additional  Interest  payable  thereon) shall be
duly and punctually paid in full when due, whether at maturity,  upon redemption
at the  option of  Holders  pursuant  to the  provisions  of the Notes  relating
thereto, by acceleration or otherwise, and interest on the overdue principal and
(to the extent  permitted by law)  interest,  if any, on the Notes and all other
obligations  of the Issuers or the  Subsidiary  Guarantors to the Holders or the
Trustee hereunder or thereunder (including amounts due the Trustee under Section
7.07  hereof)  and all  other  obligations  shall  be  promptly  paid in full or
performed,  all in accordance with the terms hereof and thereof; and (b) in case
of any extension of time of payment or renewal of any Notes or any of such other
obligations,  the same shall be promptly  paid in full when due or  performed in
accordance with the terms of the extension or renewal,  whether at maturity,  by
acceleration or otherwise. Failing payment when due of any amount so guaranteed,
or failing  performance  of any other  obligation  of the Issuers to the Holders
under this Indenture or under the Notes,  for whatever  reason,  each Subsidiary
Guarantor  shall be obligated to pay, or to perform or cause the performance of,
the same  immediately.  An Event of Default  under this  Indenture  or the Notes
shall constitute an event of default under this Guarantee, and shall entitle the
Holders of Notes to accelerate the  obligations  of the Guarantors  hereunder in
the same manner and to the same extent as the obligations of the Issuers.

            Each of the Subsidiary Guarantors hereby agrees that its obligations
hereunder shall be  unconditional,  irrespective of the validity,  regularity or
enforceability  of the Notes or this  Indenture,  the  absence  of any action to
enforce the same,  any waiver or consent by any Holder of the Notes with respect
to any  provisions  hereof or  thereof,  any  release  of any  other  Subsidiary
Guarantor,  the  recovery of any  judgment  against the  Issuers,  any action to
enforce the same,  whether or not a Guarantee is affixed to any particular Note,
or any other circumstance which might otherwise  constitute a legal or equitable
discharge or defense of a guarantor.  Each of the Subsidiary  Guarantors  hereby
waives the  benefit of  diligence,  presentment,  demand of  payment,  filing of
claims with a court in the event of insolvency or bankruptcy of the Issuers, any
right to require a proceeding first against the Issuers, protest, notice and all
demands  whatsoever  and covenants  that its  Guarantee  shall not be discharged
except by complete performance of

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the obligations contained in the Notes, this Indenture and this Guarantee.  This
Guarantee is a guarantee of payment and not of collection.  If any Holder or the
Trustee is required by any court or otherwise to return to the Issuers or to any
Subsidiary  Guarantor,  or any custodian,  trustee,  liquidator or other similar
official  acting in relation to the Issuers or such  Subsidiary  Guarantor,  any
amount paid by the Issuers or such  Subsidiary  Guarantor to the Trustee or such
Holder,  this  Guarantee,  to  the  extent  theretofore  discharged,   shall  be
reinstated in full force and effect.  Each Subsidiary  Guarantor  further agrees
that, as between it, on the one hand,  and the Holders of Notes and the Trustee,
on the other  hand,  (a) subject to this  Article  Eleven,  the  maturity of the
obligations  guaranteed  hereby may be  accelerated  as  provided in Article Six
hereof for the purposes of this Guarantee,  notwithstanding any stay, injunction
or other prohibition  preventing such acceleration in respect of the obligations
guaranteed  hereby, and (b) in the event of any acceleration of such obligations
as  provided in Article Six  hereof,  such  obligations  (whether or not due and
payable) shall forthwith become due and payable by the Subsidiary Guarantors for
the purpose of this Guarantee.

            No stockholder,  officer, director, employee or incorporator,  past,
present or future, or any Subsidiary Guarantor, as such, shall have any personal
liability  under  this  Guarantee  by reason of his,  her or its  status as such
stockholder, officer, director, employee or incorporator.

            Each Subsidiary Guarantor that makes a payment or distribution under
its Guarantee  shall be entitled to a  contribution  from each other  Subsidiary
Guarantor, determined in accordance with GAAP.

            SECTION 11.02.  Limitations on Guarantees.

            The  obligations of each  Subsidiary  Guarantor  under its Guarantee
will be limited to the maximum  amount  which,  after giving effect to all other
contingent and fixed  liabilities of such Subsidiary  Guarantor and after giving
effect to any  collections  from or  payments  made by or on behalf of any other
Subsidiary  Guarantor  in respect of the  obligations  of such other  Subsidiary
Guarantor under its Guarantee or pursuant to its contribution  obligations under
the Indenture, will result in the obligations of such Subsidiary Guarantor under
the Guarantee not  constituting a fraudulent  conveyance or fraudulent  transfer
under federal or state law.

            SECTION 11.03.  Execution and Delivery of Guarantee.

            To further  evidence the Guarantee set forth in Section 11.01,  each
Subsidiary   Guarantor   hereby  agrees  that  a  notation  of  such  Guarantee,
substantially  in the form of Exhibit E herein,  shall be  endorsed on each Note
authenticated and delivered by the Trustee.  Such Guarantee shall be executed on
behalf of each Subsidiary  Guarantor by either manual or facsimile  signature of
two Officers of each  Subsidiary  Guarantor,  each of whom, in each case,  shall
have been duly authorized to so execute by all requisite  corporate action.  The
validity and  enforceability  of any Guarantee shall not be affected by the fact
that it is not affixed to any particular Note.

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            Each of the Subsidiary  Guarantors  hereby agrees that its Guarantee
set forth in Section 11.01 shall remain in full force and effect notwithstanding
any failure to endorse on each Note a notation of such Guarantee.

            If an Officer of a Subsidiary  Guarantor  whose signature is on this
Indenture  or a  Guarantee  no longer  holds that office at the time the Trustee
authenticates  the Note on  which  such  Guarantee  is  endorsed  or at any time
thereafter,  such Subsidiary  Guarantor's  Guarantee of such Note shall be valid
nevertheless.

            The  delivery of any Note by the Trustee,  after the  authentication
thereof  hereunder,  shall constitute due delivery of any Guarantee set forth in
this Indenture on behalf of each Subsidiary Guarantor.

            SECTION 11.04.  Release of a Subsidiary Guarantor.

            (a) If no Default exists or would exist under this  Indenture,  upon
the sale or disposition of all of the Capital Stock of a Subsidiary Guarantor by
the  Issuers  or a  Restricted  Subsidiary  of  the  Issuers  in  a  transaction
constituting  an Asset  Sale the Net Cash  Proceeds  of  which  are  applied  in
accordance  with  Section  4.16,  or  upon  the  consolidation  or  merger  of a
Subsidiary Guarantor with or into any Person in compliance with Article Five (in
each case,  other than to an Issuer or an Affiliate of an Issuer or a Restricted
Subsidiary),  such  Subsidiary  Guarantor and each Subsidiary of such Subsidiary
Guarantor that is also a Subsidiary  Guarantor shall be deemed released from all
obligations under this Article Eleven without any further action required on the
part of the Trustee or any Holder; provided,  however, that each such Subsidiary
Guarantor  is sold  or  disposed  of in  accordance  with  this  Indenture.  Any
Subsidiary  Guarantor not so released or the entity  surviving  such  Subsidiary
Guarantor,  as  applicable,  shall  remain or be liable  under its  Guarantee as
provided in this Article Eleven.

            (b) The Trustee shall deliver an appropriate  instrument  evidencing
the release of a Subsidiary  Guarantor  upon receipt of a request by the Issuers
or such  Subsidiary  Guarantor  accompanied by an Officers'  Certificate  and an
Opinion of Counsel  certifying  as to the  compliance  with this Section  11.04,
provided  the legal  counsel  delivering  such Opinion of Counsel may rely as to
matters of fact on one or more Officers Certificates of the Issuers.

            The Trustee shall execute any documents  reasonably requested by the
Issuers or a  Subsidiary  Guarantor  in order to  evidence  the  release of such
Subsidiary  Guarantor from its obligations  under its Guarantee  endorsed on the
Notes and under this Article Eleven.

            Except  as set  forth in  Articles  Four  and Five and this  Section
11.04,  nothing contained in this Indenture or in any of the Notes shall prevent
any  consolidation or merger of a Subsidiary  Guarantor with or into the Issuers
or another  Subsidiary  Guarantor or shall prevent any sale or conveyance of the
property  of a  Subsidiary  Guarantor  as an  entirety  or  substantially  as an
entirety to the Issuers or another Subsidiary Guarantor.

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            SECTION 11.05.  Waiver of Subrogation.

            Until  this  Indenture  is  discharged  and  all  of the  Notes  are
discharged and paid in full, each Subsidiary Guarantor hereby irrevocably waives
and  agrees  not to  exercise  any  claim  or other  rights  which it may now or
hereafter  acquire  against the Issuers that arise from the existence,  payment,
performance or enforcement of the Issuers'  obligations  under the Notes or this
Indenture and such Subsidiary  Guarantor's  obligations under this Guarantee and
this Indenture, in any such instance including, without limitation, any right of
subrogation, reimbursement, exoneration, contribution,  indemnification, and any
right to participate in any claim or remedy of the Holders  against the Issuers,
whether or not such claim,  remedy or right arises in equity, or under contract,
statute  or common  law,  including,  without  limitation,  the right to take or
receive from the Issuers,  directly or indirectly,  in cash or other property or
by set-off or in any other manner,  payment or security on account of such claim
or other  rights.  If any amount  shall be paid to any  Subsidiary  Guarantor in
violation of the preceding  sentence and any amounts owing to the Trustee or the
Holders of Notes  under the Notes,  this  Indenture,  or any other  document  or
instrument delivered under or in connection with such agreements or instruments,
shall not have been paid in full,  such  amount  shall have been  deemed to have
been paid to such Subsidiary Guarantor for the benefit of, and held in trust for
the benefit of, the  Trustee or the Holders and shall  forthwith  be paid to the
Trustee for the benefit of itself or such  Holders to be credited and applied to
the  obligations  in favor of the  Trustee or the  Holders,  as the case may be,
whether  matured or unmatured,  in accordance  with the terms of this Indenture.
Each Subsidiary Guarantor  acknowledges that it will receive direct and indirect
benefits from the financing arrangements contemplated by this Indenture and that
the waiver set forth in this Section 11.05 is knowingly made in contemplation of
such benefits.

            SECTION 11.06.  Immediate Payment.

            Each Subsidiary  Guarantor  agrees to make immediate  payment to the
Trustee  on behalf of the  Holders  of all  Obligations  owing or payable to the
respective  Holders upon receipt of a demand for payment therefor by the Trustee
to such Subsidiary Guarantor in writing.

            SECTION 11.07.  No Set-Off.

            Each  payment  to be made by a  Subsidiary  Guarantor  hereunder  in
respect of the  Obligations  shall be payable in the currency or  currencies  in
which such  Obligations  are  denominated,  and shall be made  without  set-off,
counterclaim, reduction or diminution of any kind or nature.

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            SECTION 11.08.  Obligations Absolute.

            The obligations of each Subsidiary Guarantor hereunder are and shall
be absolute and unconditional and any monies or amounts expressed to be owing or
payable by each Subsidiary Guarantor hereunder which may not be recoverable from
such Subsidiary  Guarantor on the basis of a Guarantee shall be recoverable from
such Subsidiary  Guarantor as a primary obligor and principal  debtor in respect
thereof.

            SECTION 11.09.  Obligations Continuing.

            The  obligations of each  Subsidiary  Guarantor  hereunder  shall be
continuing  and shall remain in full force and effect until all the  obligations
have been paid and satisfied in full. Each Subsidiary  Guarantor agrees with the
Trustee  that  it  will  from  time  to time  deliver  to the  Trustee  suitable
acknowledgments  of this  continued  liability  hereunder  and  under  any other
instrument or  instruments in such form as counsel to the Trustee may advise and
as will  prevent  any  action  brought  against  it in  respect  of any  default
hereunder  being barred by any statute of limitations  now or hereafter in force
and, in the event of the failure of a  Subsidiary  Guarantor so to do, it hereby
irrevocably  appoints  the Trustee  the  attorney  and agent of such  Subsidiary
Guarantor  to  make,   execute  and  deliver  such  written   acknowledgment  or
acknowledgments  or other  instruments as may from time to time become necessary
or advisable,  in the judgment of the Trustee on the advice of counsel, to fully
maintain and keep in force the liability of such Subsidiary Guarantor hereunder.

            SECTION 11.10.  Obligations Not Reduced.

            The obligations of each Subsidiary  Guarantor hereunder shall not be
satisfied,  reduced  or  discharged  solely by the  payment  of such  principal,
premium,  if any, interest,  fees and other monies or amounts as may at any time
prior to discharge of this Indenture pursuant to Article 8 be or become owing or
payable under or by virtue of or otherwise in connection  with the Notes or this
Indenture.

            SECTION 11.11.  Obligations Reinstated.

            The  obligations  of  each  Subsidiary   Guarantor  hereunder  shall
continue to be effective or shall be  reinstated,  as the case may be, if at any
time any payment  which would  otherwise  have  reduced the  obligations  of any
Subsidiary  Guarantor hereunder (whether such payment shall have been made by or
on  behalf of the  Issuers  or by or on behalf  of a  Subsidiary  Guarantor)  is
rescinded or reclaimed from any of the Holders upon the insolvency,  bankruptcy,
liquidation or  reorganization  of either Issuer or any Subsidiary  Guarantor or
otherwise,  all as though  such  payment  had not been made.  If demand  for, or
acceleration  of the  time  for,  payment  by the  Issuers  is  stayed  upon the
insolvency, bankruptcy, liquidation or reorganization of either Issuer, all such
Indebtedness  otherwise  subject to demand for  payment  or  acceleration  shall
nonetheless be payable by each Subsidiary Guarantor as provided herein.

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            SECTION 11.12.  Obligations Not Affected.

            The obligations of each Subsidiary  Guarantor hereunder shall not be
affected,  impaired or  diminished  in any way by any act,  omission,  matter or
thing  whatsoever,  occurring  before,  upon or after  any  demand  for  payment
hereunder (and whether or not known or consented to by any Subsidiary  Guarantor
or any of the Holders) which,  but for this provision,  might constitute a whole
or partial  defense to a claim  against any  Subsidiary  Guarantor  hereunder or
might operate to release or otherwise  exonerate any  Subsidiary  Guarantor from
any of its obligations  hereunder or otherwise affect such obligations,  whether
occasioned  by default of any of the Holders or  otherwise,  including,  without
limitation:

            (a) any  limitation  of status or power,  disability,  incapacity or
      other  circumstance  relating  to  either  Issuer  or  any  other  person,
      including  any  insolvency,   bankruptcy,   liquidation,   reorganization,
      readjustment,  composition,  dissolution,  winding-up or other  proceeding
      involving or affecting either Issuer or any other person;

            (b) any  irregularity,  defect,  unenforceability  or  invalidity in
      respect of any  indebtedness  or other  obligation of either Issuer or any
      other  person  under this  Indenture,  the Notes or any other  document or
      instrument;

            (c) any  failure of the  Issuers,  whether or not  without  fault on
      their  part,  to  perform  or comply  with any of the  provisions  of this
      Indenture  or  the  Notes,  or to  give  notice  thereof  to a  Subsidiary
      Guarantor;

            (d) the taking or enforcing or  exercising or the refusal or neglect
      to take or enforce or  exercise  any right or remedy  from or against  the
      Issuers or any other person or their  respective  assets or the release or
      discharge of any such right or remedy;

            (e)  the  granting  of  time,  renewals,  extensions,   compromises,
      concessions,  waivers,  releases,  discharges and other indulgences to the
      Issuers or any other Person;

            (f) any change in the time, manner or place of payment of, or in any
      other  term of,  any of the  Notes,  or any  other  amendment,  variation,
      supplement,  replacement  or waiver of, or any consent to departure  from,
      any of the Notes or this Indenture,  including,  without  limitation,  any
      increase  or decrease in the  principal  amount of or premium,  if any, or
      interest on any of the Notes;

            (g) any change in the ownership, control, name, objects, businesses,
      assets, capital structure or constitution of either Issuer or a Subsidiary
      Guarantor;

            (h)   any merger or amalgamation of either Issuer or a Subsidiary

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      Guarantor with any Person or Persons;

            (i) the occurrence of any change in the laws, rules,  regulations or
      ordinances  of any  jurisdiction  by any  present or future  action of any
      governmental authority or court amending,  varying,  reducing or otherwise
      affecting,  or purporting to amend,  vary, reduce or otherwise affect, any
      of the Obligations or the obligations of a Subsidiary  Guarantor under its
      Guarantee; and

            (j) any other  circumstance,  including  release  of the  Subsidiary
      Guarantor  pursuant to Section 11.04 (other than by complete,  irrevocable
      payment) that might otherwise constitute a legal or equitable discharge or
      defense  of  the  Issuers  under  this  Indenture  or  the  Notes  or of a
      Subsidiary Guarantor in respect of its Guarantee hereunder.

            SECTION 11.13.  Waiver.

            Without in any way limiting the  provisions of Section 11.01 hereof,
each Subsidiary  Guarantor hereby waives notice of acceptance hereof,  notice of
any liability of any Subsidiary Guarantor hereunder, notice or proof of reliance
by the Holders upon the obligations of any Subsidiary Guarantor  hereunder,  and
diligence,  presentment,  demand for payment on the Issuers,  protest, notice of
dishonor  or  non-payment  of  any  of  the  Obligations,  or  other  notice  or
formalities to the Issuers or any Subsidiary Guarantor of any kind whatsoever.

            SECTION 11.14.  No Obligation To Take Action Against
                               the Issuers.

            Neither the Trustee nor any other Person  shall have any  obligation
to enforce or exhaust  any rights or  remedies  or to take any other steps under
any security for the  Obligations  or against the Issuers or any other Person or
any Property of the Issuers or any other  Person  before the Trustee is entitled
to demand payment and  performance by any or all Subsidiary  Guarantors of their
liabilities and obligations under their Guarantees or under this Indenture.

            SECTION 11.15.  Dealing with the Issuers and Others.

            The Holders, without releasing,  discharging,  limiting or otherwise
affecting in whole or in part the  obligations and liabilities of any Subsidiary
Guarantor  hereunder  and  without  the  consent of or notice to any  Subsidiary
Guarantor, may

            (a) grant  time,  renewals,  extensions,  compromises,  concessions,
      waivers, releases,  discharges and other indulgences to the Issuers or any
      other Person;

            (b) take or abstain  from  taking  security or  collateral  from the
      Issuers or from perfecting security or collateral of the Issuers;


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            (c) release,  discharge,  compromise,  realize, enforce or otherwise
      deal  with  or do any  act  or  thing  in  respect  of  (with  or  without
      consideration)  any and all collateral,  mortgages or other security given
      by the  Issuers or any third  party with  respect  to the  obligations  or
      matters contemplated by this Indenture or the Notes;

            (d)   accept compromises or arrangements from the Issuers;

            (e) apply all monies at any time  received  from the Issuers or from
      any security upon such part of the  Obligations as the Holders may see fit
      or change  any such  application  in whole or in part from time to time as
      the Holders may see fit; and

            (f)  otherwise  deal with,  or waive or modify  their  right to deal
      with, the Issuers and all other Persons and any security as the Holders or
      the Trustee may see fit.

            SECTION 11.16.  Default and Enforcement.

            If any Subsidiary  Guarantor fails to pay in accordance with Section
11.06  hereof,  the Trustee may proceed in its name as trustee  hereunder in the
enforcement  of  the  Guarantee  of  any  such  Subsidiary  Guarantor  and  such
Subsidiary  Guarantor's  obligations  thereunder  and  hereunder  by any  remedy
provided by law, whether by legal proceedings or otherwise,  and to recover from
such Subsidiary Guarantor the obligations.

            SECTION 11.17.  Amendment, Etc.

            No  amendment,  modification  or  waiver  of any  provision  of this
Indenture  relating to any  Subsidiary  Guarantor or consent to any departure by
any Subsidiary Guarantor or any other Person from any such provision will in any
event be  effective  unless it is signed by such  Subsidiary  Guarantor  and the
Trustee.

            SECTION 11.18.  Acknowledgment.

            Each Subsidiary  Guarantor hereby acknowledges  communication of the
terms of this Indenture and the Notes and consents to and approves of the same.

            SECTION 11.19.  Costs and Expenses.

            Each Subsidiary Guarantor shall pay on demand by the Trustee any and
all costs, fees and expenses  (including,  without  limitation,  legal fees on a
solicitor and client basis)  incurred by the Trustee,  its agents,  advisors and
counsel  or any of the  Holders  in  enforcing  any of their  rights  under  any
Guarantee.

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            SECTION 11.20.  No Merger or Waiver; Cumulative
                               Remedies.

            No  Guarantee  shall  operate  by  way  of  merger  of  any  of  the
obligations  of a Subsidiary  Guarantor  under any other  agreement,  including,
without  limitation,  this  Indenture.  No failure to  exercise  and no delay in
exercising,  on the part of the Trustee or the Holders, any right, remedy, power
or privilege  hereunder or under the Indenture or the Notes,  shall operate as a
waiver thereof;  nor shall any single or partial exercise of any right,  remedy,
power or privilege  hereunder or under this  Indenture or the Notes preclude any
other or further  exercise  thereof or the exercise of any other right,  remedy,
power or privilege. The rights, remedies, powers and privileges in the Guarantee
and under this Indenture, the Notes and any other document or instrument between
a Subsidiary  Guarantor  and/or either Issuer and the Trustee are cumulative and
not exclusive of any rights, remedies, powers and privilege provided by law.

            SECTION 11.21.  Survival of Obligations.

            Without prejudice to the survival of any of the other obligations of
each  Subsidiary  Guarantor  hereunder,   the  obligations  of  each  Subsidiary
Guarantor  under  Section  11.01  shall  survive  the  payment  in  full  of the
Obligations and shall be enforceable  against such Subsidiary  Guarantor without
regard  to and  without  giving  effect  to any  defense,  right  of  offset  or
counterclaim  available  to or  which  may be  asserted  by the  Company  or any
Subsidiary Guarantor.

            SECTION 11.22.  Guarantee in Addition to Other
                               Obligations.

            The obligations of each Subsidiary Guarantor under its Guarantee and
this  Indenture  are in  addition  to and  not in  substitution  for  any  other
obligations  to the  Trustee  or to  any of the  Holders  in  relation  to  this
Indenture or the Notes and any guarantees or security at any time held by or for
the benefit of any of them.

            SECTION 11.23.  Severability.

            Any  provision  of  this  Article  Eleven  which  is  prohibited  or
unenforceable in any jurisdiction shall not invalidate the remaining  provisions
and any such  prohibition  or  unenforceability  in any  jurisdiction  shall not
invalidate  or render  unenforceable  such  provision in any other  jurisdiction
unless its  removal  would  substantially  defeat the basic  intent,  spirit and
purpose of this Indenture and this Article Eleven.

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            SECTION 11.24.  Successors and Assigns.

            Each  Guarantee  shall be binding  upon and inure to the  benefit of
each  Subsidiary  Guarantor  and the  Trustee  and the other  Holders  and their
respective successors and permitted assigns, except that no Subsidiary Guarantor
may assign any of its obligations hereunder or thereunder.

                 [Remainder of Page Intentionally Left Blank]

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                                  SIGNATURES

            IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed, all as of the date first written above.


                          ABRAXAS PETROLEUM CORPORATION



                                    By:
                                        Name:
                                        Title:


                       CANADIAN ABRAXAS PETROLEUM LIMITED


                                    By:
                                        Name:
                                        Title:


                       IBJ SCHRODER BANK & TRUST COMPANY,
                                      as Trustee


                                    By:
                                        Name:
                                        Title:


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                                                                     EXHIBIT A


                                                               CUSIP No.:  [ ]

                         ABRAXAS PETROLEUM CORPORATION
                      11 1/2% SENIOR NOTE DUE 2004, SERIES A

No. [         ]                                                           $[ ]

            ABRAXAS PETROLEUM  CORPORATION,  a Nevada corporation,  and CANADIAN
ABRAXAS PETROLEUM  LIMITED,  a Canadian  corporation (the "Issuers",  which term
includes any successor  entities),  for value received  promise to pay to [ ] or
registered assigns the principal sum of [ ] Dollars on November 1, 2004.

            Interest Payment Dates: May 1 and November 1, commencing May 1, 1997

            Record Dates:  April 15 and October 15

            Reference is made to the further  provisions of this Note  contained
herein, which will for all purposes have the same effect as if set forth at this
place.

            IN WITNESS  WHEREOF,  the Issuers have caused this Note to be signed
manually or by  facsimile by their duly  authorized  officers and a facsimile of
their corporate seal to be affixed hereto or imprinted hereon.


                          ABRAXAS PETROLEUM CORPORATION


                                    By:
                                        Name:
                                        Title:


                       CANADIAN ABRAXAS PETROLEUM LIMITED


                                    By:
                                        Name:
                                        Title:




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Dated:

Certificate of Authentication

            This is one of the 11 1/2% Senior Notes due 2004,  Series A referred
to in the within-mentioned Indenture.

                        IBJ SCHRODER BANK & TRUST COMPANY
                                      as Trustee

                                    By:
                                             Authorized Signatory
Date of Authentication:


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                             (REVERSE OF SECURITY)

                      11 1/2% Senior Note due 2004, Series A

            (1) Interest.  ABRAXAS PETROLEUM CORPORATION,  a Nevada corporation,
and CANADIAN ABRAXAS PETROLEUM LIMITED, a Canadian  corporation (the "Issuers"),
promise to pay  interest  on the  principal  amount of this Note at the rate per
annum shown  above.  Interest on the Notes will accrue from the most recent date
on which interest has been paid or, if no interest has been paid,  from November
14,  1996.  The  Issuers  will pay  interest  semi-annually  in  arrears on each
Interest Payment Date,  commencing May 1, 1997. Interest will be computed on the
basis of a 360-day  year of twelve  30-day  months and, in the case of a partial
month, the actual number of days elapsed.

            The Issuers  shall pay interest on overdue  principal and on overdue
installments  of  interest  from time to time on demand at the rate borne by the
Notes and on overdue  installments of interest (without regard to any applicable
grace periods) to the extent lawful.

            2. Method of Payment.  The Issuers  shall pay  interest on the Notes
(except defaulted interest) to the Persons who are the registered Holders at the
close of business on the Record Date immediately  preceding the Interest Payment
Date even if the Notes are cancelled on registration of transfer or registration
of  exchange  (including  pursuant  to an  Exchange  Offer  (as  defined  in the
Registration  Rights  Agreement)) after such Record Date. Holders must surrender
Notes to a Paying Agent to collect  principal  payments.  The Issuers  shall pay
principal and interest in money of the United States that at the time of payment
is legal tender for payment of public and private debts ("U.S.  Legal  Tender").
However,  the Issuers may pay  principal  and interest by their check payable in
such U.S. Legal Tender. The Issuers may deliver any such interest payment to the
Paying Agent or to a Holder at the Holder's registered address.

            3. Paying Agent and Registrar.  Initially, IBJ Schroder Bank & Trust
Company (the "Trustee") will act as Paying Agent and Registrar.  The Company may
change  any  Paying  Agent,  Registrar  or  co-Registrar  without  notice to the
Holders.

            4. Indenture. The Issuers issued the Notes under an Indenture, dated
as of November 14, 1996 (the  "Indenture"),  among the Issuers,  the  Subsidiary
Guarantors  and the  Trustee.  This  Note is one of a duly  authorized  issue of
Initial Notes of the Issuers  designated as their 11 1/2% Senior Notes due 2004,
Series A (the  "Initial  Notes").  The Notes are limited in aggregate  principal
amount to  $215,000,000.  The Notes  include the Initial  Notes and the Exchange
Notes,  as defined  below,  issued in exchange for the Initial Notes pursuant to
the Registration Rights Agreement.  The Initial Notes and the Exchange Notes are
treated as a single class of securities under the Indenture.  Capitalized  terms
herein are used as defined in the Indenture unless otherwise defined herein. The
terms of the Notes  include those stated in the Indenture and those made part of
the  Indenture  by reference to the Trust  Indenture  Act of 1939 (15 U.S.  Code
ss.ss. 77aaa-77bbbb) (the "TIA"), as in effect

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on the date of the Indenture.  Notwithstanding  anything to the contrary herein,
the Notes are  subject to all such terms,  and Holders of Notes are  referred to
the  Indenture  and said Act for a  statement  of them.  The Notes  are  general
unsecured obligations of the Issuers.

            5. Indenture.  Each Holder,  by accepting a Note, agrees to be bound
by all of the terms and provisions of the Indenture,  as the same may be amended
from time to time in accordance with its terms.

            6. Redemption. The Notes will be redeemable, at the Issuers' option,
in whole at any time or in part from  time to time,  on and  after  November  1,
2000,  upon not less than 30 nor more  than 60 days'  notice,  at the  following
Redemption  Prices (expressed as percentages of the principal amount thereof) if
redeemed during the  twelve-month  period  commencing on November 1 of the years
set forth  below,  plus,  in each case,  accrued  and unpaid  interest,  if any,
thereon to the date of redemption:

            Year                                      Percentage

            2000............................          105.750%
            2001............................          102.875%
            2002 and thereafter....                   100.000%

            At any time, or from time to time, on or prior to __________,  1999,
the Issuers may, at their option,  use all or a portion of the net cash proceeds
of one or more Equity  Offerings  (as defined in the  Indenture) to redeem up to
35% of the  aggregate  principal  amount  of the  Notes  originally  issued at a
Redemption Price equal to 111.5% of the aggregate  principal amount of the Notes
to be redeemed, plus accrued and unpaid interest, if any, thereon to the date of
redemption; provided, however, that at least $139.75 million aggregate principal
amount of Notes remains outstanding  immediately after giving effect to any such
redemption (it being expressly  agreed that for purposes of determining  whether
this  condition  is  satisfied,  Notes  owned by  either  Issuer or any of their
Affiliates  shall be  deemed  not to be  outstanding).  In order to  effect  the
foregoing redemption with the proceeds of any Equity Offering, the Issuers shall
make such redemption not more than 60 days after the  consummation of any Equity
Offering.

            7.  Notice of  Redemption.  Notice of  redemption  will be mailed at
least 30 days but not  more  than 60 days  before  the  Redemption  Date to each
Holder of Notes to be redeemed at such  Holder's  registered  address.  Notes in
denominations larger than $1,000 may be redeemed in part.

            Except as set forth in the  Indenture,  if monies for the redemption
of the Notes called for  redemption  shall have been  deposited  with the Paying
Agent for redemption on such Redemption Date,  then,  unless the Issuers default
in the payment of such Redemption Price plus accrued interest, if any, the Notes
called for redemption will cease to bear interest from and after such Redemption
Date and the only right of the Holders of such Notes will be to receive  payment
of the Redemption Price plus accrued interest, if any.


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            8.  Offers  to  Purchase.  Sections  4.15 and 4.16 of the  Indenture
provide that,  after certain Asset Sales (as defined in the  Indenture) and upon
the occurrence of a Change of Control (as defined in the Indenture), and subject
to further  limitations  contained  therein,  the Issuers  will make an offer to
purchase  certain  amounts of the Notes in accordance  with the  procedures  set
forth in the Indenture.

            9.  Registration   Rights.   Pursuant  to  the  Registration  Rights
Agreement  among  the  Issuers,  the  Subsidiary   Guarantors  and  the  Initial
Purchasers,  the Issuers and the  Subsidiary  Guarantors  will be  obligated  to
consummate  an  exchange  offer  pursuant to which the Holder of this Note shall
have the right to exchange  this Note for the  Issuers' 11 1/2% Senior Notes due
2004,  Series B (the "Exchange  Notes"),  which have been  registered  under the
Securities  Act, in like  principal  amount and having  terms  identical  in all
material  respects as the Initial Notes.  The Holders of the Initial Notes shall
be entitled to receive certain  additional  interest  payments in the event such
exchange  offer  is not  consummated  and upon  certain  other  conditions,  all
pursuant  to and in  accordance  with  the  terms  of  the  Registration  Rights
Agreement.

            10. Denominations;  Transfer;  Exchange. The Notes are in registered
form,  without  coupons,  and (except  Notes  issued as payment of  Interest) in
denominations  of $1,000  and  integral  multiples  of  $1,000.  A Holder  shall
register the transfer of or exchange Notes in accordance with the Indenture. The
Registrar  may require a Holder,  among  other  things,  to furnish  appropriate
endorsements and transfer documents and to pay certain transfer taxes or similar
governmental  charges  payable  in  connection  therewith  as  permitted  by the
Indenture.  The  Registrar  need not register the transfer of or exchange of any
Notes or portions thereof selected for redemption.

            11. Persons Deemed Owners.  The registered Holder of a Note shall be
treated as the owner of it for all purposes.

            12.  Unclaimed  Money.  If money for the  payment  of  principal  or
interest  remains  unclaimed for one year, the Trustee and the Paying Agent will
pay the money back to the Issuers.  After that, all liability of the Trustee and
such Paying Agent with respect to such money shall cease.

            13. Discharge Prior to Redemption or Maturity. If the Issuers at any
time deposit with the Trustee U.S. Legal Tender or U.S.  Government  Obligations
sufficient  to pay the  principal of and interest on the Notes to  redemption or
maturity and comply with the other provisions of the Indenture relating thereto,
the Issuers will be discharged from certain  provisions of the Indenture and the
Notes (including certain covenants, but including,  under certain circumstances,
their  obligation  to pay the principal of and interest on the Notes but without
affecting the rights of the Holders to receive such amounts from such deposits).

            14. Amendment; Supplement; Waiver. Subject to certain exceptions set
forth  in  the  Indenture,  the  Indenture  or  the  Notes  may  be  amended  or
supplemented with the written consent of the Holders of not less than a majority
in  aggregate  principal  amount of the  Notes  then  outstanding,  and any past


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<PAGE>


Default or Event of Default or  noncompliance  with any  provision may be waived
with the written consent of the Holders of not less than a majority in aggregate
principal amount of the Notes then outstanding.  Without notice to or consent of
any Holder,  the parties  thereto may amend or  supplement  the Indenture or the
Notes to,  among other  things,  cure any  ambiguity,  defect or  inconsistency,
provide for  uncertificated  Notes in  addition  to or in place of  certificated
Notes,  comply with any  requirements  of the  Commission  in order to effect or
maintain the qualification of the Indenture under the TIA or comply with Article
Five of the  Indenture or make any other change that does not  adversely  affect
the rights of any Holder of a Note.

            15. Restrictive Covenants. The Indenture imposes certain limitations
on the ability of the Issuers and the  Restricted  Subsidiaries  to, among other
things, incur additional Indebtedness, make payments in respect of their Capital
Stock or certain Indebtedness,  make certain Investments, create or incur liens,
enter into  transactions  with  Affiliates,  create  dividend  or other  payment
restrictions affecting Restricted  Subsidiaries,  issue Preferred Stock of their
Restricted Subsidiaries,  and on the ability of the Issuers and their Restricted
Subsidiaries  to merge or  consolidate  with any other  Person or sell,  assign,
transfer,  lease, convey or otherwise dispose of all or substantially all of the
Issuers'  and  their  Restricted   Subsidiaries'  assets  or  adopt  a  plan  of
liquidation.   Such   limitations   are   subject  to  a  number  of   important
qualifications  and exceptions.  Pursuant to Section 4.06 of the Indenture,  the
Issuer must annually report to the Trustee on compliance with such limitations.

            16.  Successors.  When a successor  assumes,  in accordance with the
Indenture,  all the  obligations  of its  predecessor  under  the  Notes and the
Indenture, the predecessor, subject to certain exceptions, will be released from
those obligations.

            17.  Defaults  and  Remedies.  If an Event of Default  occurs and is
continuing,  the  Trustee  or the  Holders  of not less  than  25% in  aggregate
principal  amount of Notes then  outstanding may declare all the Notes to be due
and  payable  in the  manner,  at the time and with the effect  provided  in the
Indenture. Holders of Notes may not enforce the Indenture or the Notes except as
provided in the Indenture. The Trustee is not obligated to enforce the Indenture
or the Notes unless it has received indemnity reasonably satisfactory to it. The
Indenture permits, subject to certain limitations therein provided, Holders of a
majority in aggregate  principal  amount of the Notes then outstanding to direct
the Trustee in its exercise of any trust or power. The Trustee may withhold from
Holders of Notes notice of any continuing  Default or Event of Default (except a
Default  in payment  of  principal  or  interest  when due,  for any reason or a
Default in compliance  with Article Five of the Indenture) if it determines that
withholding notice is in their interest.

            18. Trustee Dealings with Issuers.  The Trustee under the Indenture,
in its  individual  or any other  capacity,  may  become the owner or pledgee of
Notes and may  otherwise  deal with the  Issuers,  their  Subsidiaries  or their
respective Affiliates as if it were not the Trustee.

            19. No  Recourse  Against  Others.  No partner,  director,  officer,
employee or stockholder,  as such, of either Issuer or any Subsidiary Guarantor,

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as such,  shall have any liability for any  obligations  of either Issuer or any
Subsidiary  Guarantor  under the Notes,  the  Indenture,  the  Guarantees or the
Registration  Rights  Agreement  or for any claim based on, in respect of, or by
reason of, such obligations or their creation. Each Holder of Notes by accepting
a Note waives and releases all such  liability.  The waiver and release are part
of the consideration for the issuance of the Notes.

            20.  Guarantees.  This  Note will be  entitled  to the  benefits  of
certain  Guarantees,  if any, made for the benefit of the Holders.  Reference is
hereby  made  to  the  Indenture  for a  statement  of  the  respective  rights,
limitations  of rights,  duties and  obligations  thereunder  of the  Subsidiary
Guarantors, the Trustee and the Holders.

            21.  Authentication.  This Note shall not be valid until the Trustee
or Authenticating Agent manually signs the certificate of authentication on this
Note.

            22.  Governing Law. This Note and the Indenture shall be governed by
and construed in  accordance  with the laws of the State of New York, as applied
to contracts made and performed within the State of New York,  without regard to
principles of conflict of laws.  Each of the parties  hereto agrees to submit to
the  jurisdiction  of the  courts  of the  State  of New York in any  action  or
proceeding arising out of or relating to this Note.

            23. Abbreviations and Defined Terms. Customary  abbreviations may be
used in the  name of a Holder  of a Note or an  assignee,  such  as:  TEN COM (=
tenants  in  common),  TEN ENT (= tenants  by the  entireties),  JT TEN (= joint
tenants  with  right of  survivorship  and not as tenants  in  common),  CUST (=
Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

            24. CUSIP Numbers.  Pursuant to a recommendation  promulgated by the
Committee on Uniform Security Identification Procedures, the Issuers have caused
CUSIP numbers to be printed on the Notes as a convenience  to the Holders of the
Notes. No  representation  is made as to the accuracy of such numbers as printed
on the Notes and reliance may be placed only on the other identification numbers
printed hereon.

            The  Issuers  will  furnish  to any  Holder of a Note  upon  written
request and without charge a copy of the  Indenture,  which has the text of this
Note.  Requests may be made to: Abraxas  Petroleum  Corporation,  500 North Loop
1604 East, Suite 100, San Antonio, Texas 78232.

145385.01


<PAGE>





                               ASSIGNMENT FORM


            If you the Holder want to assign  this Note,  fill in the form below
and have your signature guaranteed:


I or we assign and transfer this Note to:






                 (Print or type name, address and zip code and
                 social security or tax ID number of assignee)

and irrevocably appoint              , agent to transfer this Note on the books
of the Issuers.  The agent may substitute another to act for him.


Dated:                     Signed:
                                (Sign exactly as your name appears
                                 on the other side of this Note)

Signature Guarantee:


            In connection  with any transfer of this Note occurring prior to the
date which is the earlier of (i) the date of the  declaration  by the Commission
of the  effectiveness  of a registration  statement  under the Securities Act of
1933, as amended (the  "Securities  Act")  covering  resales of this Note (which
effectiveness  shall not have been  suspended or  terminated  at the date of the
transfer)  and (ii) [ ], the  undersigned  confirms that it has not utilized any
general solicitation or general advertising in connection with the transfer:

145385.01


<PAGE>





                                  [Check One]

(1)   __    to the Issuers or a subsidiary thereof; or

(2)   __    pursuant to and in compliance with Rule 144A under the Securities
            Act of 1933, as amended; or

(3)   __    to an  institutional  "accredited  investor"  (as defined in Rule
            501(a)(1),  (2),  (3) or (7) under the  Securities  Act of 1933,  as
            amended)   that  has  furnished  to  the  Trustee  a  signed  letter
            containing certain representations and agreements (the form of which
            letter can be obtained from the Trustee); or

(4)   __    outside  the United  states to a "foreign  person" in  compliance
            with Rule 904 of Regulation S under the  Securities  Act of 1933, as
            amended; or

(5)   __    pursuant to the exemption from registration  provided by Rule 144
            under the Securities Act of 1933, as amended; or

(6)   __    pursuant  to  an  effective  registration  statement  under  the
            Securities Act of 1933, as amended; or

(7)   __    pursuant to another  available  exemption  from the  registration
            requirements of the Securities Act of 1933, as amended.

and unless the box below is checked,  the undersigned confirms that such Note is
not being  transferred  to an  "affiliate" of the Issuers as defined in Rule 144
under the Securities Act of 1933, as amended (an "Affiliate"):

      o     The transferee is an Affiliate of the Issuers.

Unless one of the items is checked,  the Trustee  will refuse to register any of
the Notes evidenced by this certificate in the name of any person other than the
registered Holder thereof; provided,  however, that if item (3), (4), (5) or (7)
is checked,  the Issuers or the Trustee may require,  prior to  registering  any
such  transfer  of the  Notes,  in their sole  discretion,  such  written  legal
opinions,  certifications (including an investment letter in the case of box (3)
or (4)) and other  information  as the  Trustee or the Issuers  have  reasonably
requested to confirm that such  transfer is being made  pursuant to an exemption
from, or in a transaction not subject to, the  registration  requirements of the
Securities Act of 1933, as amended.

145385.01


<PAGE>





If none of the foregoing  items are checked,  the Trustee or Registrar shall not
be  obligated  to  register  this Note in the name of any person  other than the
Holder  hereof  unless  and  until  the  conditions  to  any  such  transfer  of
registration  set forth herein and in Section 2.17 of the  Indenture  shall have
been satisfied.


Dated:                      Signed:
                              (Sign exactly as name
                            appears on the other side
                                  of this Note)


Signature Guarantee:


             TO BE COMPLETED BY PURCHASER IF (2) ABOVE IS CHECKED

            The  undersigned  represents and warrants that it is purchasing this
Note for its own account or an account with  respect to which it exercises  sole
investment  discretion  and  that  it  and  any  such  account  is a  "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933,  as amended  and is aware that the sale to it is being made in reliance on
Rule 144A and acknowledges  that it has received such information  regarding the
Issuers as the undersigned has requested pursuant to Rule 144A or has determined
not to request  such  information  and that it is aware that the  transferor  is
relying upon the undersigned's  foregoing  representations in order to claim the
exemption from registration provided by Rule 144A.


Dated:
                            NOTICE: To be executed by
                              an executive officer

145385.01


<PAGE>





                     [OPTION OF HOLDER TO ELECT PURCHASE]


            If you want to elect to have  this  Note  purchased  by the  Issuers
pursuant to Section 4.15 or Section 4.16 of the Indenture, check the appropriate
box:

                  Section 4.15 [     ]
                  Section 4.16 [     ]

            If you want to elect to have only part of this Note purchased by the
Issuers  pursuant to Section  4.15 or Section 4.16 of the  Indenture,  state the
amount you elect to have purchased:


$-------------------


Dated: __________________
                                NOTICE:  The signature on this  assignment  must
                                correspond  with the name as it appears upon the
                                face  of the  within  Note in  every  particular
                                without  alteration or enlargement or any change
                                whatsoever and be guaranteed.


Signature Guarantee:


145385.01


<PAGE>





                                                                     EXHIBIT B

                                                               CUSIP No.:  [ ]

                         ABRAXAS PETROLEUM CORPORATION
                      11 1/2% SENIOR NOTE DUE 2004, SERIES B

No. [         ]                                                           $[ ]

            ABRAXAS PETROLEUM  CORPORATION,  a Nevada corporation,  and CANADIAN
ABRAXAS PETROLEUM  LIMITED,  a Canadian  corporation (the "Issuers",  which term
includes any successor  entities),  for value received  promise to pay to [ ] or
registered assigns the principal sum of [ ] Dollars on November 1, 2004.

            Interest Payment Dates: May 1 and November 1, commencing May 1, 1997

            Record Dates:  April 15 and October 15

            Reference is made to the further  provisions of this Note  contained
herein, which will for all purposes have the same effect as if set forth at this
place.

            IN WITNESS  WHEREOF,  the Issuers have caused this Note to be signed
manually or by  facsimile by their duly  authorized  officers and a facsimile of
their corporate seal to be affixed hereto or imprinted hereon.


                          ABRAXAS PETROLEUM CORPORATION


                                    By:
                                        Name:
                                        Title:


                       CANADIAN ABRAXAS PETROLEUM LIMITED


                                    By:
                                        Name:
                                        Title:




145385.01


<PAGE>





Dated:

Certificate of Authentication

            This is one of the 11 1/2% Senior Notes due 2004,  Series B referred
to in the within-mentioned Indenture.

                      IBT SCHRODER BANK AND TRUST COMPANY,
                                      as Trustee

                                    By:
                                             Authorized Signatory
Date of Authentication:
                             (REVERSE OF SECURITY)

                      11 1/2% Senior Note due 2004, Series B

            1. Interest.  ABRAXAS PETROLEUM  CORPORATION,  a Nevada corporation,
and CANADIAN ABRAXAS PETROLEUM LIMITED, a Canadian  corporation (the "Issuers"),
promise to pay  interest  on the  principal  amount of this Note at the rate per
annum shown  above.  Interest on the Notes will accrue from the most recent date
on which interest has been paid or, if no interest has been paid,  from November
14,  1996.  The  Issuers  will pay  interest  semi-annually  in  arrears on each
Interest Payment Date,  commencing May 1, 1997. Interest will be computed on the
basis of a 360-day  year of twelve  30-day  months and, in the case of a partial
month, the actual number of days elapsed.

            The Issuers  shall pay interest on overdue  principal and on overdue
installments  of  interest  from time to time on demand at the rate borne by the
Notes and on overdue  installments of interest (without regard to any applicable
grace periods) to the extent lawful.

            2. Method of Payment.  The Issuers  shall pay  interest on the Notes
(except defaulted interest) to the Persons who are the registered Holders at the
close of business on the Record Date immediately  preceding the Interest Payment
Date even if the Notes are cancelled on registration of transfer or registration
of exchange  after such Record Date.  Holders must  surrender  Notes to a Paying
Agent to  collect  principal  payments.  The  Issuers  shall pay  principal  and
interest  in money of the  United  States  that at the time of  payment is legal
tender for payment of public and private debts ("U.S.  Legal Tender").  However,
the Issuers may pay  principal  and interest by their check payable in such U.S.
Legal Tender.  The Issuers may deliver any such  interest  payment to the Paying
Agent or to a Holder at the Holder's registered address.

            3. Paying Agent and Registrar.  Initially, IBJ Schroder Bank & Trust
Company (the "Trustee") will act as Paying Agent and Registrar.  The Company may
change  any  Paying  Agent,  Registrar  or  co-Registrar  without  notice to the
Holders.

145385.01


<PAGE>





            4. Indenture. The Issuers issued the Notes under an Indenture, dated
as of November 14, 1996 (the  "Indenture"),  among the Issuers,  the  Subsidiary
Guarantors  and the  Trustee.  This  Note is one of a duly  authorized  issue of
Exchange Notes of the Issuers designated as their 11 1/2% Senior Notes due 2004,
Series B (the "Exchange  Notes").  The Notes are limited in aggregate  principal
amount  to  $215,000,000.  The  Notes  include  the 11 1/2%  Notes due 2004 (the
"Initial  Notes") and the  Exchange  Notes,  issued in exchange  for the Initial
Notes pursuant to the Registration  Rights Agreement.  The Initial Notes and the
Exchange Notes are treated as a single class of securities  under the Indenture.
Capitalized  terms herein are used as defined in the Indenture  unless otherwise
defined herein. The terms of the Notes include those stated in the Indenture and
those made part of the Indenture by reference to the Trust Indenture Act of 1939
(15 U.S. Code ss.ss.  77aaa-77bbbb) (the "TIA"), as in effect on the date of the
Indenture.  Notwithstanding  anything  to the  contrary  herein,  the  Notes are
subject to all such terms,  and Holders of Notes are  referred to the  Indenture
and  said  Act  for a  statement  of  them.  The  Notes  are  general  unsecured
obligations of the Issuers.

            5. Indenture.  Each Holder,  by accepting a Note, agrees to be bound
by all of the terms and provisions of the Indenture,  as the same may be amended
from time to time in accordance with its terms.

            6. Redemption. The Notes will be redeemable, at the Issuers' option,
in whole at any time or in part from  time to time,  on and  after  November  1,
2000,  upon not less than 30 nor more  than 60 days'  notice,  at the  following
Redemption  Prices (expressed as percentages of the principal amount thereof) if
redeemed during the  twelve-month  period  commencing on November 1 of the years
set below, plus, in each case,  accrued and unpaid interest,  if any, thereon to
the date of redemption:


            Year                                      Percentage

            2000............................           105.750%
            2001............................           102.875%
            2002 and thereafter....                    100.000%

            At any time, or from time to time,  on or prior to _________,  1999,
the Issuers may, at their option,  use all or a portion of the net cash proceeds
of one or more Equity  Offerings  (as defined in the  Indenture) to redeem up to
35% of the  aggregate  principal  amount  of the  Notes  originally  issued at a
Redemption Price equal to 111.5% of the aggregate  principal amount of the Notes
to be redeemed, plus accrued and unpaid interest, if any, thereon to the date of
redemption; provided, however, that at least $139.75 million aggregate principal
amount of Notes remains outstanding  immediately after giving effect to any such
redemption (it being expressly  agreed that for purposes of determining  whether
this  condition  is  satisfied,  Notes  owned by  either  Issuer or any of their
Affiliates  shall be  deemed  not to be  outstanding).  In order to  effect  the
foregoing redemption with the proceeds of any Equity Offering, the Issuers shall
make such redemption not more than 60 days after the  consummation of any Equity
Offering.

145385.01


<PAGE>





            7.  Notice of  Redemption.  Notice of  redemption  will be mailed at
least 30 days but not  more  than 60 days  before  the  Redemption  Date to each
Holder of Notes to be redeemed at such  Holder's  registered  address.  Notes in
denominations larger than $1,000 may be redeemed in part.

            Except as set forth in the  Indenture,  if monies for the redemption
of the Notes called for  redemption  shall have been  deposited  with the Paying
Agent for redemption on such Redemption Date,  then,  unless the Issuers default
in the payment of such Redemption Price plus accrued interest, if any, the Notes
called for redemption will cease to bear interest from and after such Redemption
Date and the only right of the Holders of such Notes will be to receive  payment
of the Redemption Price plus accrued interest, if any.

            8.  Offers  to  Purchase.  Sections  4.15 and 4.16 of the  Indenture
provide that,  after certain Asset Sales (as defined in the  Indenture) and upon
the occurrence of a Change of Control (as defined in the Indenture), and subject
to further  limitations  contained  therein,  the Issuers  will make an offer to
purchase  certain  amounts of the Notes in accordance  with the  procedures  set
forth in the Indenture.

            9. Denominations;  Transfer;  Exchange.  The Notes are in registered
form,  without  coupons,  and (except  Notes  issued as payment of  Interest) in
denominations  of $1,000  and  integral  multiples  of  $1,000.  A Holder  shall
register the transfer of or exchange Notes in accordance with the Indenture. The
Registrar  may require a Holder,  among  other  things,  to furnish  appropriate
endorsements and transfer documents and to pay certain transfer taxes or similar
governmental  charges  payable  in  connection  therewith  as  permitted  by the
Indenture.  The  Registrar  need not register the transfer of or exchange of any
Notes or portions thereof selected for redemption.

            10. Persons Deemed Owners.  The registered Holder of a Note shall be
treated as the owner of it for all purposes.

            11.  Unclaimed  Money.  If money for the  payment  of  principal  or
interest  remains  unclaimed for one year, the Trustee and the Paying Agent will
pay the money back to the Issuers.  After that, all liability of the Trustee and
such Paying Agent with respect to such money shall cease.

            12. Discharge Prior to Redemption or Maturity. If the Issuers at any
time deposit with the Trustee U.S. Legal Tender or U.S.  Government  Obligations
sufficient to pay the  principal of and interest on the Notes to redemption  and
comply with the other provisions of the Indenture relating thereto,  the Issuers
will be  discharged  from  certain  provisions  of the  Indenture  and the Notes
(including  certain covenants,  including,  under certain  circumstances,  their
obligation  to pay the  principal  of and  interest  on the  Notes  but  without
affecting the rights of the Holders to receive such amounts from such deposit).

            13. Amendment; Supplement; Waiver. Subject to certain exceptions set
forth  in  the  Indenture,  the  Indenture  or  the  Notes  may  be  amended  or
supplemented with the written consent of the Holders of not less than a majority
in  aggregate  principal  amount of the  Notes  then  outstanding,  and any past


145385.01


<PAGE>


Default or Event of Default or  noncompliance  with any  provision may be waived
with the written consent of the Holders of not less than a majority in aggregate
principal amount of the Notes then outstanding.  Without notice to or consent of
any Holder,  the parties  thereto may amend or  supplement  the Indenture or the
Notes to,  among other  things,  cure any  ambiguity,  defect or  inconsistency,
provide for  uncertificated  Notes in  addition  to or in place of  certificated
Notes,  comply with any  requirements  of the  Commission  in order to effect or
maintain the qualification of the Indenture under the TIA or comply with Article
Five of the  Indenture or make any other change that does not  adversely  affect
the rights of any Holder of a Note.

            14. Restrictive Covenants. The Indenture imposes certain limitations
on the ability of the Issuers and the  Restricted  Subsidiaries  to, among other
things, incur additional Indebtedness, make payments in respect of their Capital
Stock or certain Indebtedness,  make certain Investments, create or incur liens,
enter into  transactions  with  Affiliates,  create  dividend  or other  payment
restrictions affecting Restricted  Subsidiaries,  issue Preferred Stock of their
Restricted Subsidiaries,  and on the ability of the Issuers and their Restricted
Subsidiaries  to merge or  consolidate  with any other  Person or sell,  assign,
transfer,  lease, convey or otherwise dispose of all or substantially all of the
Issuers'  and  their  Restricted   Subsidiaries'  assets  or  adopt  a  plan  of
liquidation.   Such   limitations   are   subject  to  a  number  of   important
qualifications  and exceptions.  Pursuant to Section 4.06 of the Indenture,  the
Issuers must annually report to the Trustee on compliance with such limitations.

            15.  Successors.  When a successor  assumes,  in accordance with the
Indenture,  all the  obligations  of its  predecessor  under  the  Notes and the
Indenture, the predecessor, subject to certain exceptions, will be released from
those obligations.

            16.  Defaults  and  Remedies.  If an Event of Default  occurs and is
continuing,  the  Trustee  or the  Holders  of not less  than  25% in  aggregate
principal  amount of Notes then  outstanding may declare all the Notes to be due
and  payable  in the  manner,  at the time and with the effect  provided  in the
Indenture. Holders of Notes may not enforce the Indenture or the Notes except as
provided in the Indenture. The Trustee is not obligated to enforce the Indenture
or the Notes unless it has received indemnity reasonably satisfactory to it. The
Indenture permits, subject to certain limitations therein provided, Holders of a
majority in aggregate  principal  amount of the Notes then outstanding to direct
the Trustee in its exercise of any trust or power. The Trustee may withhold from
Holders of Notes notice of any continuing  Default or Event of Default (except a
Default  in payment  of  principal  or  interest  when due,  for any reason or a
Default in compliance  with Article Five of the Indenture) if it determines that
withholding notice is in their interest.

            17. Trustee Dealings with Issuers.  The Trustee under the Indenture,
in its  individual  or any other  capacity,  may  become the owner or pledgee of
Notes and may  otherwise  deal with the  Issuers,  their  Subsidiaries  or their
respective Affiliates as if it were not the Trustee.

            18. No  Recourse  Against  Others.  No partner,  director,  officer,
employee or stockholder,  as such, of either Issuer or any Subsidiary Guarantor,

145385.01


<PAGE>





as such,  shall have any liability for any  obligations  of either Issuer or any
Subsidiary  Guarantor  under the Notes,  the  Indenture,  the  Guarantees or the
Registration  Rights  Agreement  or for any claim based on, in respect of, or by
reason of, such obligations or their creation. Each Holder of Notes by accepting
a Note waives and releases all such  liability.  The waiver and release are part
of the consideration for the issuance of the Notes.

            19.  Guarantees.  This  Note will be  entitled  to the  benefits  of
certain  Guarantees,  if any, made for the benefit of the Holders.  Reference is
hereby  made  to  the  Indenture  for a  statement  of  the  respective  rights,
limitations  of rights,  duties and  obligations  thereunder  of the  Subsidiary
Guarantors, the Trustee and the Holders.

            20.  Authentication.  This Note shall not be valid until the Trustee
or Authenticating Agent manually signs the certificate of authentication on this
Note.

            21.  Governing Law. This Note and the Indenture shall be governed by
and construed in  accordance  with the laws of the State of New York, as applied
to contracts made and performed within the State of New York,  without regard to
principles of conflict of laws.  Each of the parties  hereto agrees to submit to
the  jurisdiction  of the  courts  of the  State  of New York in any  action  or
proceeding arising out of or relating to this Note.

            22. Abbreviations and Defined Terms. Customary  abbreviations may be
used in the  name of a Holder  of a Note or an  assignee,  such  as:  TEN COM (=
tenants  in  common),  TEN ENT (= tenants  by the  entireties),  JT TEN (= joint
tenants  with  right of  survivorship  and not as tenants  in  common),  CUST (=
Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

            23. CUSIP Numbers.  Pursuant to a recommendation  promulgated by the
Committee on Uniform Security Identification Procedures, the Issuers have caused
CUSIP numbers to be printed on the Notes as a convenience  to the Holders of the
Notes. No  representation  is made as to the accuracy of such numbers as printed
on the Notes and reliance may be placed only on the other identification numbers
printed hereon.

            The  Issuers  will  furnish  to any  Holder of a Note  upon  written
request and without charge a copy of the  Indenture,  which has the text of this
Note.  Requests may be made to: Abraxas  Petroleum  Corporation,  500 North Loop
1604 East, Suite 100, San Antonio, Texas 78232.

145385.01


<PAGE>





                                ASSIGNMENT FORM


            If you the Holder want to assign  this Note,  fill in the form below
and have your signature guaranteed:


I or we assign and transfer this Note to:






                 (Print or type name, address and zip code and
                 social security or tax ID number of assignee)


and  irrevocably  appoint  , agent to  transfer  this  Note on the  books of the
Issuers. The agent may substitute another to act for him.


Dated:                              Signed:
                          (Sign exactly as name appears
                         on the other side of this Note)


Signature Guarantee:

145385.01


<PAGE>





                     [OPTION OF HOLDER TO ELECT PURCHASE]


            If you want to elect to have  this  Note  purchased  by the  Issuers
pursuant to Section 4.15 or Section 4.16 of the Indenture, check the appropriate
box:

                  Section 4.15 [     ]
                  Section 4.16 [     ]

            If you want to elect to have only part of this Note purchased by the
Issuers  pursuant to Section  4.15 or Section 4.16 of the  Indenture,  state the
amount you elect to have purchased:


$-------------------


Dated: _________________
                               NOTICE:  The  signature on this  assignment  must
                               correspond  with the name as it appears  upon the
                               face  of the  within  Note  in  every  particular
                               without  alteration or  enlargement or any change
                               whatsoever and be guaranteed.


Signature Guarantee:


145385.01


<PAGE>





                                                                     EXHIBIT C

                          Form of Certificate To Be
                         Delivered in Connection with
                  Transfers to Non-QIB Accredited Investors


                                                                   [ ], [    ]

[                        ]
[                        ]
[                        ]

Ladies and Gentlemen:

            In connection with our proposed purchase of 11 1/2% Senior Notes due
2004 (the "Notes") of Abraxas  Petroleum  Corporation  ("Abraxas")  and Canadian
Abraxas Petroleum Limited ("Canadian Abraxas"), we confirm that:

            I. We have received a copy of the Offering Memorandum (the "Offering
      Memorandum"),  dated  ,  1996,  relating  to  the  Notes  and  such  other
      information as we deem necessary in order to make our investment decision.
      We  acknowledge  that we have read and agreed to the matters stated in the
      section entitled "Transfer Restrictions" of such Offering Memorandum.

            2. We  understand  that  any  subsequent  transfer  of the  Notes is
      subject to certain  restrictions and conditions set forth in the indenture
      relating  to the Notes (the  "Indenture")  as  described  in the  Offering
      Memorandum and the  undersigned  agrees to be bound by, and not to resell,
      pledge or otherwise  transfer the Notes except in  compliance  with,  such
      restrictions  and  conditions  and the  Securities Act of 1933, as amended
      (the "Securities Act"), and all applicable State securities laws.

            3. We understand  that the offer and sale of the Notes have not been
      registered under the Securities Act, and that the Notes may not be offered
      or sold within the United  States or to, or for the account or benefit of,
      U.S. persons except as permitted in the following  sentence.  We agree, on
      our own  behalf and on behalf of any  accounts  for which we are acting as
      hereinafter  stated,  that if we should sell any Notes, we will do so only
      (i) to Abraxas,  Canadian Abraxas or any subsidiary  thereof,  (ii) inside
      the United States in accordance with Rule 144A under the Securities Act to
      a  "qualified  institutional  buyer" (as defined in Rule 144A  promulgated
      under the Securities Act) that, prior to such transfer,  furnishes (or has
      furnished  on its  behalf  by a U.S.  broker-dealer)  to the  Trustee  (as
      defined   in  the   Indenture)   a  signed   letter   containing   certain
      representations and agreements relating to the restrictions on transfer of
      the Notes (the form of which letter can be



<PAGE>





      obtained from the Trustee),  (iii) outside the United States in accordance
      with  Rule 904 of  Regulation  S  promulgated  under  the  Securities  Act
      (provided  that any  such  sale or  transfer  in  Canada  or to or for the
      benefit of a Canadian  resident must be effected  pursuant to an exemption
      from  the  prospectus  and  registration   requirements  under  applicable
      Canadian   securities   laws),   (iv)  pursuant  to  the  exemption   from
      registration provided by Rule 144 under the Securities Act (if available),
      or  (v)  pursuant  to  an  effective   registration  statement  under  the
      Securities  Act, and we further agree to provide to any person  purchasing
      any of the Notes from us a notice  advising such purchaser that resales of
      the Notes are restricted as stated herein.

            4. We understand  that, on any proposed resale of any Notes, we will
      be required to furnish to the Trustee,  Abraxas and Canadian  Abraxas such
      certification,  legal  opinions and other  information  as the Trustee and
      Abraxas may reasonably  require to confirm that the proposed sale complies
      with the  foregoing  restrictions.  We further  understand  that the Notes
      purchased by us will bear a legend to the foregoing effect.

            5. We are an institutional "accredited investor" (as defined in Rule
      501(a)(1),  (2), (3) or (7) of Regulation D under the Securities  Act) and
      have such knowledge and experience in financial and business matters as to
      be capable of  evaluating  the merits and risks of our  investment  in the
      Notes,  and we and any  accounts  for which we are acting are each able to
      bear the economic risk of our or their investment, as the case may be.

            6. We are acquiring the Notes purchased by us for our account or for
      one or more  accounts  (each  of  which  is an  institutional  "accredited
      investor") as to each of which we exercise sole investment discretion.

            You, Abraxas,  Canadian Abraxas, the Trustee and others are entitled
to rely upon this letter and are  irrevocably  authorized to produce this letter
or a copy  hereof  to  any  interested  party  in any  administrative  or  legal
proceeding or official inquiry with respect to the matters covered hereby.

                                    Very truly yours,

                                    [Name of Transferee]




                                    By:
                                       Name:
                                       Title:





<PAGE>





                                                                     EXHIBIT D

                     Form of Certificate To Be Delivered
                         in Connection with Transfers
                           Pursuant to Regulation S


                                                                   [ ], [    ]


[                  ]
[                  ]
[                  ]
[                  ]




      Re:  Abraxas Petroleum Corporation
            Canadian Abraxas Petroleum Limited (the "Issuers")
            11 1/2% Senior Notes due 2004 (the "Notes")


Ladies and Gentlemen:

            In  connection  with our proposed  sale of $[ ] aggregate  principal
amount of the Notes, we confirm that such sale has been effected pursuant to and
in  accordance  with  Regulation  S under the U.S.  Securities  Act of 1933,  as
amended (the "Securities Act"), and, accordingly, we represent that:

            (1) the offer of the  Notes  was not made to a person in the  United
      States;

            (2)  either  (a) at the  time  the buy  offer  was  originated,  the
      transferee  was outside the United  States or we and any person  acting on
      our behalf reasonably  believed that the transferee was outside the United
      States,  or (b)  the  transaction  was  executed  in,  on or  through  the
      facilities of a designated  off-shore securities market and neither we nor
      any  person  acting on our  behalf  knows  that the  transaction  has been
      pre-arranged with a buyer in the United States;

            (3) no directed  selling efforts have been made in the United States
      in  contravention  of the  requirements  of Rule  903(b) or Rule 904(b) of
      Regulation S, as applicable;

            (4) the  transaction  is not part of a plan or  scheme  to evade the
      registration requirements of the Securities Act; and





<PAGE>





            (5) we have  advised the  transferee  of the  transfer  restrictions
      applicable to the Notes.

            You,  the Issuers  and counsel for the Issuers are  entitled to rely
upon this letter and are irrevocably authorized to produce this letter or a copy
hereof to any interested  party in any  administrative  or legal  proceedings or
official inquiry with respect to the matters covered hereby.  Terms used in this
certificate have the meanings set forth in Regulation S.

                                    Very truly yours,

                                    [Name of Transferor]


                                    By:
                              Authorized Signature





<PAGE>





                                                                     EXHIBIT E


                                   GUARANTEE


            For  value   received,   the  undersigned   hereby   unconditionally
guarantees, as principal obligor and not only as a surety, to the Holder of this
Note the cash payments in United States  dollars of principal  of,  premium,  if
any,  and  interest  on this Note (and  including  Additional  Interest  payable
thereon) in the  amounts  and at the times when due and  interest on the overdue
principal,  premium, if any, and interest,  if any, of this Note, if lawful, and
the payment or  performance  of all other  obligations  of the Issuers under the
Indenture  or the  Notes,  to the  Holder of this Note and the  Trustee,  all in
accordance with and subject to the terms and  limitations of this Note,  Article
Eleven of the Indenture and this Guarantee. This Guarantee will become effective
in  accordance  with  Article  Eleven of the  Indenture  and its terms  shall be
evidenced therein. The validity and enforceability of any Guarantee shall not be
affected by the fact that it is not affixed to any particular Note.  Capitalized
terms used but not defined  herein shall have the  meanings  ascribed to them in
the  Indenture  dated  as  of  November  14,  1996,   among  Abraxas   Petroleum
Corporation,  a Nevada  corporation,  and Canadian Abraxas Petroleum  Limited, a
Canadian  corporation,  as issuers (the "Issuers") and IBJ Schroder Bank & Trust
Company,   as  trustee  (the  "Trustee"),   as  amended  or  supplemented   (the
"Indenture").

            The  obligations  of the  undersigned to the Holders of Notes and to
the Trustee pursuant to this Guarantee and the Indenture are expressly set forth
in Article Eleven of the Indenture and reference is hereby made to the Indenture
for the precise terms of the  Guarantee  and all of the other  provisions of the
Indenture to which this Guarantee relates.

            THIS GUARANTEE SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT GIVING
EFFECT TO PRINCIPLES OF CONFLICTS OF LAW.  Each Subsidiary Guarantor hereby
agrees to submit to the  jurisdiction  of the courts of the State of New York in
any action or proceeding arising out of or relating to this Guarantee.

            This Guarantee is subject to release upon the terms set forth in the
Indenture.




<PAGE>




            IN  WITNESS  WHEREOF,  each  Subsidiary  Guarantor  has  caused  its
Guarantee to be duly executed.


Date:  ____________________

                              [NAME OF SUBSIDIARY GUARANTOR], as
                                Guarantor


                              By:
                                    Name:
                                    Title:


                              By:
                                    Name:
                                    Title:





<PAGE>



                         ABRAXAS PETROLEUM CORPORATION
                      CANADIAN ABRAXAS PETROLEUM LIMITED
                                 $215,000,000
                          11 1/2% Senior Notes due 2004


                              PURCHASE AGREEMENT



                                                              November 5, 1996


BT SECURITIES CORPORATION
BANKERS TRUST INTERNATIONAL PLC
JEFFERIES & COMPANY INC.
ING BARING (U.S.) SECURITIES CORPORATION
c/o BT Securities Corporation
  One Bankers Trust Plaza
  130 Liberty Street
  New York, New York  10006


Ladies and Gentlemen:

            Abraxas Petroleum Corporation, a Nevada corporation (the "Company"),
and Canadian Abraxas Petroleum  Limited, a Canada corporation and a wholly-owned
subsidiary of the Company ("Canadian Abraxas" and together with the Company, the
"Issuers"),  hereby confirm their agreement with you (the "Initial  Purchasers")
as set forth below.

            1. The  Securities.  Subject  to the  terms  and  conditions  herein
contained,  the  Issuers  propose  to issue and sell to the  Initial  Purchasers
$215,000,000  aggregate  principal amount of their 11 1/2% Senior Notes due 2004
(the "Notes"). The Notes will be guaranteed (collectively,  the "Guarantees") on
a senior  basis by each of the  Company's  future  Restricted  Subsidiaries  (as
defined in the Indenture) (collectively, the "Subsidiary Guarantors"). The Notes
and the Guarantees are collectively referred to herein as the "Securities".  The
Notes are to be issued under an indenture  (the  "Indenture")  to be dated as of
November  14,  1996 by and  among  the  Issuers  and IBJ  Schroder  Bank & Trust
Company, as Trustee (the "Trustee").

            The Securities are being offered in connection  with and conditioned
upon (i) the Issuers'  acquisition of 100% of the capital stock of CGGS Canadian
Gas Gathering Systems Inc. ("CGGS"),  (ii) the Company's  acquisition of the oil
and gas producing properties located in the Portilla and Happy Fields ("Portilla
and Happy") (the acquisitions of CGGS and Portilla and Happy being  collectively
referred to herein as the "Pending  Acquisitions" and the agreements executed or

                                     1


<PAGE>

to be executed by the Issuers in connection  with the Pending  Acquisitions  are
collectively referred to herein as the "Acquisition Agreements"),  and (iii) the
Issuers' entering into a new $40.0 million senior revolving credit facility (the
"New Credit Facility").

            The  Securities  will be offered and sold to the Initial  Purchasers
without  being  registered  under the  Securities  Act of 1933,  as amended (the
"Act"), in reliance on exemptions therefrom.

            In  connection  with the sale of the  Securities,  the Issuers  have
prepared  a  preliminary   offering  memorandum  dated  October  21,  1996  (the
"Preliminary  Memorandum"),  and a final offering  memorandum  dated November 6,
1996  (the  "Final  Memorandum";   the  Preliminary  Memorandum  and  the  Final
Memorandum  each herein being  referred to as a  "Memorandum")  setting forth or
including  a  description  of the  terms  of the  Securities,  the  terms of the
offering of the Securities,  a description of the Pending  Acquisitions  and the
New Credit Agreement, a description of the Issuers and the Subsidiary Guarantors
and any  material  developments  relating  to the  Issuers  and  the  Subsidiary
Guarantors  occurring  after the date of the most  recent  historical  financial
statements included therein.

            The Initial Purchasers and their direct and indirect  transferees of
the  Securities  will be entitled to the  benefits  of the  Registration  Rights
Agreement  to be dated as of the Closing Date (as  defined)  (the  "Registration
Rights  Agreement"),  pursuant  to which the  Issuers  will  agree,  among other
things, to file with the Securities and Exchange  Commission (the "Commission"),
under the  circumstances set forth therein,  (i) a registration  statement under
the Act (the "Exchange Offer Registration Statement"),  relating to Senior Notes
due 2004 of the Issuers (the  "Exchange  Notes") to be offered in exchange  (the
"Exchange  Offer") for the Notes,  and (ii) as and to the extent required by the
Registration Rights Agreement,  a shelf registration  statement pursuant to Rule
415 under the Act (the "Shelf  Registration  Statement"  and,  together with the
Exchange Offer Registration Statement, the "Registration Statements"),  relating
to the resale by certain holders of the Notes,  and to use their best efforts to
cause such  Registration  Statements  to be declared  effective.  This  Purchase
Agreement (this "Agreement"),  the Notes, the Guarantees,  the Indenture and the
Registration  Rights  Agreement are hereinafter  referred to collectively as the
"Operative Documents."

            2.  Representations  and  Warranties.   The  Issuers,   jointly  and
severally,  represent  and  warrant  to and  agree  with  each  of  the  Initial
Purchasers that:

            (a) Neither the Preliminary  Memorandum as of its date nor the Final
      Memorandum nor any amendment or supplement  thereto as of the date thereof
      and at all times subsequent  thereto up to the Closing Date (as defined in
      Section 3 below)  contained or contains any untrue statement of a material
      fact or omitted or omits to state a material  fact  necessary  to make the
      statements  therein,  in the light of the  circumstances  under which they
      were made, not misleading,  except that the representations and warranties
      set forth in this  Section  2(a) do not apply to  statements  or omissions
      
                                     2


<PAGE>

      made in reliance upon and in conformity with  information  relating to any
      of the  Initial  Purchasers  furnished  to the  Issuers  in writing by the
      Initial Purchasers  expressly for use in the Preliminary  Memorandum,  the
      Final Memorandum or any amendment or supplement thereto.

            (b) As of June 30, 1996, the Company had the authorized,  issued and
      outstanding  capitalization set forth in the Final Memorandum;  all of the
      subsidiaries  of the  Company  are listed on  Schedule  I attached  hereto
      (each, a "Subsidiary" and collectively,  the  "Subsidiaries");  all of the
      outstanding  shares of  capital  stock of the  Issuers  and of each of the
      Subsidiaries of the Company have been, and as of the Closing Date will be,
      duly authorized and validly issued,  are fully paid and  nonassessable and
      were not issued in violation of any preemptive or similar  rights;  all of
      the outstanding shares of capital stock of Canadian Abraxas and of each of
      the  Subsidiaries  (other than with respect to the shares of capital stock
      of Grey Wolf  Exploration  Ltd.,  an Alberta  corporation  ("Grey  Wolf"),
      Cascade Oil & Gas Ltd., an Alberta  corporation  ("Cascade"),  and Western
      Associated  Energy  Corporation,  a Texas  corporation  ("Western"),  such
      shares of capital  stock owned by others as of the Closing Date and as set
      forth in the Final Memorandum) will be owned by the Company free and clear
      of all  liens,  encumbrances,  equities  and  claims  or  restrictions  on
      transferability (other than those imposed by the Act and the securities or
      "Blue Sky" laws of certain  jurisdictions) or voting;  except as set forth
      in the Final  Memorandum,  as of June 30, 1996, there were no (i) options,
      warrants or other rights to purchase, (ii) agreements or other obligations
      of the  Issuers to issue or (iii) other  rights to convert any  obligation
      into,  or  exchange  any  securities  for,  shares of capital  stock of or
      ownership   interests  in  either  Issuer  or  any  of  the   Subsidiaries
      outstanding.  Except for the  Subsidiaries  and as  disclosed in the Final
      Memorandum,  none of the Issuers or any of the Subsidiaries owns, directly
      or  indirectly,  any  shares  of  capital  stock or any  other  equity  or
      long-term  debt  securities  or have  any  equity  interest  in any  firm,
      partnership, joint venture or other entity.

            (c) Each of the Issuers and the  Subsidiaries is duly  incorporated,
      validly  existing and in good  standing  under the laws of its  respective
      jurisdiction of  incorporation  and has all requisite  corporate power and
      authority to own its  properties and conduct its business as now conducted
      and as  described  in the Final  Memorandum;  each of the  Issuers and the
      Subsidiaries is duly qualified to do business as a foreign  corporation in
      good standing in all other jurisdictions where the ownership or leasing of
      its properties or the conduct of its business requires such qualification,
      except where the failure to be so qualified would not,  individually or in
      the  aggregate,  have a material  adverse  effect on the general  affairs,
      management,  business,  condition  (financial or otherwise),  prospects or
      results of operations of the Issuers and the Subsidiaries taken as a whole
      (any such event, a "Material Adverse Effect").

            (d)  Each of the  Issuers  and the  Subsidiaries  has all  requisite
      corporate  power  and  authority  to  execute,  deliver  and  perform  its
      respective  obligations  under  this  Agreement  and the  other  Operative
      Documents  to  which  it is a party  and to  consummate  the  transactions
      
                                    3


<PAGE>

      contemplated hereby and thereby, including,  without limitation, the power
      and authority to issue, sell and deliver the Securities as contemplated by
      this Agreement.

            (e) This  Agreement has been duly and validly  authorized,  executed
      and delivered by each of the Issuers.

            (f) The  Indenture  has been  duly  and  validly  authorized  by the
      Issuers and, when duly executed and delivered in accordance with its terms
      (assuming the due execution and delivery thereof by the Trustee),  will be
      the  valid and  legally  binding  agreement  of the  Issuers,  enforceable
      against  each  of  them in  accordance  with  its  terms,  except  as such
      enforceability may be limited by bankruptcy,  insolvency,  reorganization,
      moratorium and other similar laws now or hereinafter in effect relating to
      or affecting creditors' rights generally,  by general equitable principles
      (regardless of whether such  enforceability  is considered in a proceeding
      in  equity  or at law);  and the  Indenture  meets  the  requirements  for
      qualification  under the Trust  Indenture  Act of 1939,  as  amended  (the
      "TIA").

            (g) The Notes have been duly and validly authorized for issuance and
      sale to the Initial  Purchasers by the Issuers  pursuant to this Agreement
      and, when issued and  authenticated  in  accordance  with the terms of the
      Indenture and delivered  against  payment  therefor in accordance with the
      terms  hereof,  will be the legally valid and binding  obligations  of the
      Issuers,  enforceable  against each of them in accordance with their terms
      and   entitled  to  the  benefits  of  the   Indenture,   except  as  such
      enforceability may be limited by bankruptcy,  insolvency,  reorganization,
      moratorium and other similar laws now or hereinafter in effect relating to
      or affecting creditors' rights generally,  by general equitable principles
      (regardless of whether such  enforceability  is considered in a proceeding
      in  equity or at law) or the  discretion  of the  court  before  which any
      proceeding therefor may be brought.

            (h) The  Exchange  Notes have been duly and validly  authorized  for
      issuance by the Issuers and, when issued and  authenticated  in accordance
      with the terms of the Indenture, the Registration Rights Agreement and the
      Exchange Offer,  will be the legally valid and binding  obligations of the
      Issuers,  enforceable  against each of them in accordance with their terms
      and   entitled  to  the  benefits  of  the   Indenture,   except  as  such
      enforceability may be limited by bankruptcy,  insolvency,  reorganization,
      moratorium and other similar laws now or hereinafter in effect relating to
      or affecting creditors' rights generally,  by general equitable principles
      (regardless of whether such  enforceability  is considered in a proceeding
      in  equity or at law) or the  discretion  of the  court  before  which any
      proceeding therefor may be brought.

            (i) The  Registration  Rights  Agreement has been duly authorized by
      the Issuers and, when duly executed and delivered by the Issuers (assuming
      the due execution and delivery  thereof by you), will be the legally valid
      and binding obligation of the Issuers, enforceable against each of them in
      accordance with its terms, except as such enforceability may be limited by
      
                                     4


<PAGE>


      bankruptcy, insolvency, reorganization,  moratorium and other similar laws
      now or hereinafter in effect  relating to or affecting  creditors'  rights
      generally,  by general  equitable  principles  (regardless of whether such
      enforceability  is  considered in a proceeding in equity or at law) or the
      discretion  of the court  before  which  any  proceeding  therefor  may be
      brought  and,  as  to  rights  of  indemnification  and  contribution,  by
      principles  of  public  policy  or U.S.  or  Canadian  federal,  state  or
      provincial securities laws relating thereto.

            (j) No  consent,  waiver,  approval,  authorization  or  order of or
      filing,  registration,  qualification,  license  or  permit of or with any
      court or  governmental  agency or body, or third party is required for (i)
      the  issuance  and  sale  by the  Issuers  of  the  Notes  to the  Initial
      Purchasers  or the  consummation  by the  Issuers  of  each  of the  other
      transactions  contemplated  hereby  or  by  any  of  the  other  Operative
      Documents,  (ii) the issuance and sale by the Subsidiary Guarantors of the
      Guarantees or the  consummation by the Subsidiary  Guarantors of the other
      transactions  contemplated  hereby or by any of the  Operative  Documents,
      (iii) the consummation by the Issuers of the transactions  contemplated by
      the  Acquisition  Agreements,  to the extent each is a party thereto,  and
      (iv) the  execution  by the  Company  of the New Credit  Facility  and the
      consummation  by the Issuers of each of the  transactions  contemplated by
      the New Credit Facility, except, in each case, such as have been or, prior
      to the Closing  Date,  will be obtained and such as may be required  under
      state  securities or "Blue Sky" laws in  connection  with the purchase and
      resale of the Securities by the Initial Purchasers. None of the Issuers or
      any of the  Subsidiaries  is (A) in violation of its charter or bylaws (or
      similar  organizational  document),  (B) in  breach  or  violation  of any
      statute,  judgment, decree, order, rule or regulation applicable to any of
      them or any of their respective  properties or assets, except for any such
      breach or violation  which would not,  individually  or in the  aggregate,
      have a Material Adverse Effect,  or (C) in breach of or default under (nor
      has any event  occurred  which,  with  notice or  passage of time or both,
      would  constitute a default  under) or in violation of any of the terms or
      provisions of any  indenture,  mortgage,  deed of trust,  loan  agreement,
      note, lease, license, permit, certificate,  contract or other agreement or
      instrument  to which  any of them is a party  or to  which  any of them or
      their   respective   properties   or  assets  is  subject   (collectively,
      "Contracts"),  except for any such  breach,  default,  violation  or event
      which would not, individually or in the aggregate, have a Material Adverse
      Effect.

            (k) The execution,  delivery and  performance by the Issuers of this
      Agreement and each of the other Operative Documents (to the extent a party
      thereto) and the consummation of the transactions  contemplated hereby and
      thereby  (including,  without  limitation,  the  issuance  and sale of the
      Securities  to the Initial  Purchasers  and the  issuance of the  Exchange
      Notes in the  Exchange  Offer),  the  consummation  by the  Issuers of the
      Pending  Acquisitions,  to the  extent  each is a party  thereto,  and the
      execution,  delivery  and  performance  by the  Company  of the New Credit
      Facility  do not and will not  violate,  conflict  with or  constitute  or
      result in a breach of or a default  under (or  constitute  an event  which

                                     5


<PAGE>


      with notice or passage of time or both would  constitute a default  under)
      or cause  an  acceleration  of any  obligation  under,  or  result  in the
      imposition  or creation of (or the  obligation to create or impose) a Lien
      (as  defined)  on  any  properties  or  assets  of  either  Issuer  or any
      Subsidiary  with respect to (A) the terms or  provisions  of any Contract,
      except for any such conflict,  breach,  violation,  default or event which
      would not,  individually  or in the  aggregate,  have a  Material  Adverse
      Effect, (B) the charter or bylaws (or similar organizational  document) of
      the Issuers or any of the Subsidiaries,  or (C) (assuming  compliance with
      all  applicable  state  securities  or "Blue  Sky" laws and  assuming  the
      accuracy of the  representations  and warranties of the Initial Purchasers
      in  Section  8 hereof)  any  statute,  judgment,  decree,  order,  rule or
      regulation  applicable to the Issuers or any of the Subsidiaries or any of
      their  respective  properties  or assets,  except  for any such  conflict,
      breach or violation  which would not,  individually  or in the  aggregate,
      have a Material Adverse Effect.

            (l) Ernst & Young  LLP,  Deloitte  & Touche  LLP and KPMG  Chartered
      Accountants who are reporting on the audited  financial  statements of the
      Issuers,  Enserch  Exploration,  Inc.'s  Wamsutter  Area package and CGGS,
      respectively,  included in the Final  Memorandum,  are independent  public
      accountants   within  the  meaning  of  the  Act.  The  audited  financial
      statements of the Issuers, CGGS and Enserch Exploration,  Inc.'s Wamsutter
      Area package and related  notes thereto  included in the Final  Memorandum
      present  fairly in all  material  respects the  financial  position of the
      Issuers, CGGS and Enserch Exploration, Inc.'s Wamsutter Area package as of
      the dates indicated and the results of their respective operations and the
      changes in the cash flow for the periods  specified,  in  accordance  with
      generally accepted  accounting  principles ("GAAP")  consistently  applied
      throughout such periods,  except as otherwise stated therein.  The summary
      and  selected  financial  and  statistical  data  included  in  the  Final
      Memorandum  present fairly in all material  respects the information shown
      therein and have been prepared and compiled on a basis consistent with the
      audited financial statements included therein, except as stated therein.

            (m) The pro forma financial statements (including the notes thereto)
      and the  other  pro  forma  financial  information  included  in the Final
      Memorandum  (i)  comply  as to  form in all  material  respects  with  the
      applicable requirements of Regulation S-X promulgated under the Securities
      Exchange Act of 1934,  as amended  (the  "Exchange  Act"),  (ii) have been
      prepared in all  material  respects in  accordance  with the  Commission's
      rules and guidelines with respect to pro forma financial  statements,  and
      (iii) have been  properly  computed on the bases  described  therein;  the
      assumptions  used in the  preparation of the pro forma  financial data and
      other pro forma financial information included in the Final Memorandum are
      reasonable and the adjustments used therein are appropriate to give effect
      to the transactions or circumstances referred to therein.

            (n)  There is not  pending  or,  to the  knowledge  of the  Issuers,
      threatened any action, suit, proceeding, inquiry or investigation to which
      either of the Issuers or any of the  Subsidiaries  is a party, or to which

                                     6


<PAGE>


      the property or assets of either of the Issuers or any of the Subsidiaries
      is subject,  before or brought by any court,  arbitrator  or  governmental
      agency or body which, if determined  adversely to either of the Issuers or
      any of the Subsidiaries,  would,  individually or in the aggregate, have a
      Material  Adverse Effect or which seeks to restrain,  enjoin,  prevent the
      consummation  of or  otherwise  challenge  the  issuance  or  sale  of the
      Securities  to  be  sold  hereunder  or  the  consummation  of  the  other
      transactions described in the Final Memorandum.

            (o) Each of the Issuers and the Subsidiaries possesses all licenses,
      permits,    certificates,    consents,   orders,   approvals   and   other
      authorizations  from, and has made all  declarations and filings with, all
      federal,   state,   local  and   other   governmental   authorities,   all
      self-regulatory   organizations   and  all  courts  and  other  tribunals,
      presently  required or necessary to own or lease,  as the case may be, and
      to  operate  its  respective  properties  and to carry  on its  respective
      businesses  as now or proposed to be  conducted  as set forth in the Final
      Memorandum  ("Permits"),  except  where the failure to obtain such Permits
      would not,  individually  or in the  aggregate,  reasonably be expected to
      have a Material  Adverse Effect;  each of the Issuers and the Subsidiaries
      has fulfilled and  performed all of its  obligations  with respect to such
      Permits and no event has occurred  which allows,  or after notice or lapse
      of time would allow,  revocation or termination  thereof or results in any
      other material  impairment of the rights of the holder of any such Permit,
      except where the failure to perform such  obligations or the occurrence of
      such  event  would not have a  Material  Adverse  Effect;  and none of the
      Issuers  or  any  of the  Subsidiaries  has  received  any  notice  of any
      proceeding  relating to  revocation  or  modification  of any such Permit,
      except  as  described  in the  Final  Memorandum  and  except  where  such
      revocation or  modification  would not,  individually or in the aggregate,
      have a Material Adverse Effect.

            (p) Since the respective  dates as to which  information is given in
      the Final Memorandum, except as described therein, (i) none of the Issuers
      or any of the  Subsidiaries  has incurred any  liabilities or obligations,
      direct  or  contingent,  or  entered  into or  agreed  to  enter  into any
      transactions or contracts  (written or oral) not in the ordinary course of
      business,  or which  liabilities,  obligations,  transactions or contracts
      would,  individually  or in the  aggregate,  be material to the  business,
      condition (financial or otherwise),  prospects or results of operations of
      the  Issuers  and the  Subsidiaries,  taken as a whole,  (ii)  none of the
      Issuers or any of the  Subsidiaries  has purchased any of its  outstanding
      capital stock (other than  repurchases by the Company of its capital stock
      in the open  market  not  exceeding  $1  million  in the  aggregate),  nor
      declared,  paid or otherwise made any dividend or distribution of any kind
      on its capital  stock  (other than with  respect to the  Company's  Series
      1995-B  Preferred  Stock  and  other  than  with  respect  to any of  such
      Subsidiary, the purchase of, or dividend or distribution on, capital stock
      owned by the  Company)  and (iii)  there shall not have been any change in
      the  capital  stock or  long-term  indebtedness  of any of the  Issuers or
      Subsidiaries.


                                     7


<PAGE>



            (q) Each of the Issuers and the Subsidiaries has filed all necessary
      federal, state and foreign income and franchise tax returns,  except where
      the  failure to so file such  returns  would not,  individually  or in the
      aggregate, have a Material Adverse Effect, and has paid all taxes shown as
      due  thereon  except as to taxes any of the  Issuers  or  Subsidiaries  is
      contesting in good faith; and other than tax deficiencies which any of the
      Issuers or  Subsidiaries  is  contesting  in good faith and for which such
      Issuer or such  Subsidiaries has provided  adequate reserves in accordance
      with generally accepted accounting principles,  there is no tax deficiency
      that has been asserted against any of the Issuers or the Subsidiaries that
      would have, individually or in the aggregate, a Material Adverse Effect.

            (r) The  statistical and  market-related  data included in the Final
      Memorandum are based on or derived from sources which the Issuers  believe
      to be reliable and accurate.

            (s) None of the  Issuers  or any of the  Subsidiaries  or any  agent
      acting on their  behalf has taken or will take any action that might cause
      this Agreement or the sale of the Securities to violate Regulation G, T, U
      or X of the Board of Governors of the Federal Reserve System, in each case
      as in effect,  or as the same may  hereafter be in effect,  on the Closing
      Date.

            (t) Each of the Issuers and the Subsidiaries has good and defensible
      title  to all  real  property  and good  title  to all  personal  property
      described  in the  Final  Memorandum  as  being  owned  by it and good and
      defensible title to a leasehold  estate in the real and personal  property
      described in the Final  Memorandum as being leased by it free and clear of
      all liens, charges,  encumbrances or restrictions,  except as described in
      the Final  Memorandum,  liens arising under the New Credit  Facility or to
      the extent the failure to have such title or the  existence of such liens,
      charges,  encumbrances or restrictions  would not,  individually or in the
      aggregate,  have a Material  Adverse  Effect.  All leases,  contracts  and
      agreements  to which any of the Issuers or  Subsidiaries  is a party or by
      which any of them is bound are valid and  enforceable  against such Issuer
      or such  Subsidiary,  as the  case  may be,  and to the  knowledge  of the
      Issuers and the Subsidiaries  are valid and enforceable  against the other
      party or parties  thereto  and are in full force and effect with only such
      exceptions as would not, individually or in the aggregate, have a Material
      Adverse  Effect,   except  as  such   enforceability  may  be  limited  by
      bankruptcy, insolvency, reorganization,  moratorium and other similar laws
      now or hereinafter in effect  relating to or affecting  creditors'  rights
      generally,  by general  equitable  principles  (regardless of whether such
      enforceability  is  considered in a proceeding in equity or at law) or the
      discretion  of the court  before  which  any  proceeding  therefor  may be
      brought. The Issuers and the Subsidiaries own or possess adequate licenses
      or other  rights to use all  patents,  trademarks,  service  marks,  trade
      names,  copyrights and know-how necessary to conduct the businesses now or
      proposed to be operated by them as described in the Final Memorandum,  and
      none of the Issuers or any of the  Subsidiaries has received any notice of
      infringement of or conflict with (or knows of any such  infringement of or
      conflict  with)  asserted  rights of others with  respect to any  patents,

                                     8


<PAGE>



      trademarks,  service marks, trade names,  copyrights or know-how which, if
      such assertion of infringement  or conflict were  sustained,  would have a
      Material Adverse Effect.

            (u)  There are no legal or  governmental  proceedings  involving  or
      affecting any of the Issuers or  Subsidiaries  or any of their  respective
      properties  or  assets  which  would  be  required  to be  described  in a
      prospectus  pursuant  to the Act that are not so  described  in the  Final
      Memorandum,  nor are there any material contracts or other documents which
      would be required to be described in a prospectus pursuant to the Act that
      are not so described in the Final Memorandum.

            (v) Except as  described  in the Final  Memorandum  or as would not,
      individually  or in  the  aggregate,  reasonably  be  expected  to  have a
      Material Adverse Effect (A) each of the Issuers and the Subsidiaries is in
      compliance with and not subject to any known  liability  under  applicable
      Environmental  Laws (as  defined  below),  (B) each of the Issuers and the
      Subsidiaries  has made all filings and provided all notices required under
      any applicable  Environmental Law, and has, and is in compliance with, all
      Permits required under any applicable  Environmental Laws and each of them
      is in  full  force  and  effect,  (C)  there  is  no  civil,  criminal  or
      administrative  action, suit, demand, claim, hearing,  notice of violation
      or, to the knowledge of the Issuers and the  Subsidiaries,  investigation,
      proceeding,  notice or demand letter or request for information pending or
      threatened  against  any of the  Issuers  or the  Subsidiaries  under  any
      Environmental  Law, (D) no lien,  charge,  encumbrance or restriction  has
      been  recorded  under any  Environmental  Law with  respect to any assets,
      facility or property owned,  operated,  leased or controlled by any of the
      Issuers  or  the  Subsidiaries,  (E)  none  of the  Issuers  or any of the
      Subsidiaries  has  received  notice  that  it  has  been  identified  as a
      potentially  responsible  party  under  the  Comprehensive   Environmental
      Response,  Compensation and Liability Act of 1980, as amended  ("CERCLA"),
      or any  comparable  state law,  (F) no  property or facility of any of the
      Issuers or the  Subsidiaries  is (i) listed  or, to the  knowledge  of the
      Issuers  and  the  Subsidiaries  proposed  for  listing  on  the  National
      Priorities  List  under  CERCLA  or is (ii)  listed  in the  Comprehensive
      Environmental  Response,  Compensation,  Liability Information System List
      promulgated  pursuant to CERCLA,  or on any comparable  list maintained by
      any state or local governmental authority.

            For  purposes  of this  Agreement,  "Environmental  Laws"  means the
      common  law  and  all  applicable   federal,   state  and  local  laws  or
      regulations,  codes,  orders,  decrees,  judgments or injunctions  issued,
      promulgated,  approved or entered  thereunder,  relating to  pollution  or
      protection  of public or  employee  health and safety or the  environment,
      including, without limitation, laws relating to (i) emissions, discharges,
      releases  or  threatened   releases  of  hazardous   materials   into  the
      environment  (including,  without limitation,  ambient air, surface water,
      ground water,  land surface or subsurface  strata),  (ii) the manufacture,
      processing,  distribution, use, generation,  treatment, storage, disposal,
      transport or handling of hazardous  materials,  and (iii)  underground and
      above ground storage tanks and related piping, and emissions,  discharges,

                                     9


<PAGE>



      releases or threatened releases therefrom.

            (w) There is no strike,  labor  dispute,  slowdown or work  stoppage
      with the  employees  of any of the  Issuers or the  Subsidiaries  which is
      pending or, to the knowledge of the Issuers, threatened.

            (x)  Each of the  Issuers  and the  Subsidiaries  carries  insurance
      including self-insurance in such amounts and covering such risks as in its
      reasonable  determination  is adequate for the conduct of its business and
      the value of its properties.

            (y) None of the Issuers or any of the  Subsidiaries has incurred any
      liability  for any  prohibited  transaction  or funding  deficiency or any
      complete or partial  withdrawal  liability  with  respect to any  pension,
      profit  sharing or other plan which is subject to the Employee  Retirement
      Income  Security Act of 1974,  as amended  ("ERISA"),  to which any of the
      Issuers or the  Subsidiaries  makes or ever has made a contribution and in
      which any  employee  of any of the Issuers or the  Subsidiaries  is or has
      ever been a  participant,  which in the  aggregate  could  have a Material
      Adverse  Effect.  With respect to such plans,  each of the Issuers and the
      Subsidiaries  is  in  compliance  in  all  respects  with  all  applicable
      provisions  of ERISA,  except  where the  failure to so comply  would not,
      individually or in the aggregate, have a Material Adverse Effect.

            (z) Each of the  Issuers  and the  Subsidiaries  (i) makes and keeps
      accurate books and records and (ii) maintains internal accounting controls
      which provide  reasonable  assurance that (A) transactions are executed in
      accordance with management's authorization,  (B) transactions are recorded
      as necessary to permit  preparation  of its  financial  statements  and to
      maintain  accountability  for its  assets,  (C)  access  to its  assets is
      permitted only in accordance with  management's  authorization and (D) the
      reported accountability for its assets is compared with existing assets at
      reasonable intervals.

            (aa)  None  of the  Issuers  or any of the  Subsidiaries  will be an
      "investment  company" or  "promoter"  or  "principal  underwriter"  for an
      "investment  company," as such terms are defined in the Investment Company
      Act of 1940, as amended, and the rules and regulations thereunder.

            (bb) The Notes,  the  Guarantees,  the Indenture,  the  Registration
      Rights  Agreement  and the New Credit  Facility  conform  in all  material
      respects to the descriptions thereof contained in the Final Memorandum.

            (cc) No holder of securities of any of the Issuers or any Subsidiary
      will be entitled to have such securities registered under the registration
      statements   required  to  be  filed  by  the  Issuers   pursuant  to  the
      Registration Rights Agreement, other than as expressly permitted thereby.


                                     10


<PAGE>



            (dd)   Immediately   after  the  consummation  of  the  transactions
      contemplated  by  the  Acquisition  Agreements,  this  Agreement  and  the
      Indenture, the fair value and present fair saleable value of the assets of
      each of the Issuers and the Subsidiaries will exceed the sum of its stated
      liabilities and identified contingent liabilities;  none of the Issuers or
      any of the Subsidiaries (each on a consolidated basis) is, nor will any of
      the Issuers or the Subsidiaries  (each on a consolidated  basis) be, after
      giving  effect  to  the  execution,   delivery  and   performance  of  the
      Acquisition  Agreements,   this  Agreement  and  the  Indenture,  and  the
      consummation of the transactions contemplated hereby and thereby, (a) left
      with unreasonably  small capital with which to carry on its business as it
      is proposed to be conducted,  (b) unable to pay its debts  (contingent  or
      otherwise) as they mature or (c) otherwise insolvent.

            (ee) None of the Issuers or any of the  Subsidiaries or any of their
      respective Affiliates (as defined in Rule 501(b) of Regulation D under the
      Act) has  directly,  or through  any agent,  (i) sold,  offered  for sale,
      solicited  offers  to buy or  otherwise  negotiated  in  respect  of,  any
      "security"  (as defined in the Act) which is or could be  integrated  with
      the sale of the Securities in a manner that would require the registration
      under the Act of the  Securities  or (ii)  engaged  in any form of general
      solicitation or general advertising (as those terms are used in Regulation
      D under the Act) in connection  with the offering of the  Securities or in
      any manner  involving a public offering within the meaning of Section 4(2)
      of the Act.

            (ff) When the Securities are delivered  pursuant to this  Agreement,
      none of the  Securities  will be of the same class  (within the meaning of
      Rule 144A under the Act) as securities of either Issuer or any  Subsidiary
      that are listed on a national securities exchange registered under Section
      6 of the  Exchange  Act or that are  quoted in a United  States  automated
      inter-dealer quotation system.

            (gg) All legal or governmental  proceedings,  contracts or documents
      of a character  required to be  described in a  registration  statement on
      Form S-1 or to be filed as an exhibit to a registration  statement on Form
      S-1 have been so  described;  and any such  descriptions  are complete and
      accurate in all material respects.

            (hh) None of the Issuers, the Subsidiaries,  any of their respective
      Affiliates  (as defined in Rule 501(b) of  Regulation  D under the Act) or
      any  person  acting  on  any of  their  behalf  (other  than  the  Initial
      Purchasers)  has engaged in any directed  selling efforts (as that term is
      defined in  Regulation S under the Act  ("Regulation  S")) with respect to
      the Securities; the Issuers and their respective Affiliates and any person
      acting on any of their  behalf  (other than the Initial  Purchasers)  have
      complied with the offering restrictions requirement of Regulation S.

            (ii) Subsequent to the respective  dates as of which  information is
      given in the Final  Memorandum  and up to the Closing Date,  except as set
      forth in the Final  Memorandum,  neither of the Issuers has  incurred  any
      liabilities or  obligations,  direct or contingent,  which are material to
      the Issuers taken as a whole,  nor entered into any transaction not in the
      ordinary course of business and there has not been, individually or in the

                                   11


<PAGE>



      aggregate,  any material  adverse  change,  or any  development  which may
      reasonably  be  expected  to involve a  material  adverse  change,  in the
      properties,  business,  results of  operations,  condition  (financial  or
      otherwise),  affairs or  prospects  of the Issuers  taken as a whole other
      than any such effect caused solely by decreases in crude oil,  natural gas
      liquids  and natural  gas prices  (any such  event,  a  "Material  Adverse
      Change").

            (jj) Assuming that the representations and warranties of the Initial
      Purchasers  contained  in  Section  8 are  true  and  correct,  it is  not
      necessary  in  connection  with  the  offer,  sale  and  delivery  of  the
      Securities  to the  Initial  Purchasers  or the  reoffer and resale by the
      Initial  Purchasers  in the  manner  contemplated  by  this  Agreement  to
      register  the  Securities  under the Act or to qualify  the  Indenture  in
      respect of the Notes under the TIA.

            (kk)  Western is a  subsidiary  of the Company  with no  operations,
      assets or  liabilities  other than  $2,000,000 par value  preferred  stock
      issued to a bank. Portilla Happy Corporation, a Texas corporation, will be
      dissolved  prior to the Closing Date and will not be a  Subsidiary  of the
      Company on the Closing Date.

            Any certificate signed by any officer of either Issuer and delivered
to any Initial  Purchaser or to counsel for the Initial  Purchasers or either of
the Issuers shall be deemed a joint and several  representation  and warranty by
the Issuers to each Initial Purchaser as to the matters covered thereby.

            3. Purchase,  Sale and Delivery of the  Securities.  On the basis of
the representations,  warranties,  agreements and covenants herein contained and
subject to the terms and conditions herein set forth, the Issuers agree to issue
and sell to the Initial Purchasers, and the Initial Purchasers, acting severally
and not jointly, agree to purchase the Notes (and the related Guarantees) in the
respective  amounts set forth  opposite  their  respective  names on Schedule II
attached hereto at [ ]% of their principal  amount.  One or more certificates in
definitive  form for the Notes and Guarantees  that the Initial  Purchasers have
agreed to purchase  hereunder,  and in such  denomination or  denominations  and
registered in such name or names as the Initial  Purchasers  request upon notice
to the Issuers at least 36 hours prior to the Closing  Date,  shall be delivered
by or on behalf of the Issuers to the Initial Purchasers,  against payment by or
on behalf of the  Initial  Purchasers  of the  purchase  price  therefor by wire
transfer  (same day funds) to such  account or  accounts  as the  Issuers  shall
specify prior to the Closing Date, or by such means as the parties  hereto shall
agree prior to the Closing Date. Such delivery of and payment for the Securities
shall be made at the offices of Cahill  Gordon & Reindel,  80 Pine  Street,  New
York,  New York at 10:00 A.M.,  New York time,  on November 14, 1996, or at such
other place,  time or date as the Initial  Purchasers,  on the one hand, and the
Issuers,  on the other  hand,  may agree  upon,  such time and date of  delivery
against payment being herein referred to as the "Closing Date." The Issuers will
make such certificate or certificates for the Securities  available for checking
and  packaging  by the  Initial  Purchasers  at  the  offices  of BT  Securities
Corporation  in New York,  New York,  or at such  other  place as BT  Securities
Corporation may designate, at least 24 hours prior to the Closing Date.

                                     12


<PAGE>



            4.  Offering  by the  Initial  Purchasers.  The  Initial  Purchasers
propose to make an  offering of the  Securities  at the price and upon the terms
set forth in the Final  Memorandum,  as soon as practicable after this Agreement
is entered into and as in the judgment of the Initial Purchasers is advisable.

            5.  Covenants of the Issuers.  The Issuers,  jointly and  severally,
covenant and agree with each of the Initial Purchasers that:

            (a) The Issuers will not amend or supplement the Final Memorandum or
      any amendment or supplement  thereto of which the Initial Purchasers shall
      not  previously  have been  advised and  furnished a copy for a reasonable
      period of time prior to the  proposed  amendment or  supplement  and as to
      which the Initial  Purchasers  shall not have given their  consent,  which
      consent shall not  unreasonably  be withheld.  The Issuers will  promptly,
      upon the reasonable  request of the Initial  Purchasers or counsel for the
      Initial Purchasers,  make any amendments or supplements to the Preliminary
      Memorandum or the Final  Memorandum  that may be necessary or advisable in
      connection with the resale of the Securities by the Initial Purchasers.

            (b) The  Issuers  will  cooperate  with the  Initial  Purchasers  in
      arranging for the  qualification  of the  Securities for offering and sale
      under  the  securities  or "Blue  Sky" laws of such  jurisdictions  as the
      Initial Purchasers may designate and will continue such  qualifications in
      effect  for as long as may be  necessary  to  complete  the  resale of the
      Securities;  provided,  however, that in connection therewith,  neither of
      the Issuers  shall be required to qualify as a foreign  corporation  or to
      execute a general  consent to service  of process in any  jurisdiction  or
      subject  itself to  taxation in excess of a nominal  dollar  amount in any
      such jurisdiction where it is not then so subject.

            (c) If,  at any time  prior to the  initial  resale  by the  Initial
      Purchasers of the  Securities or the Exchange  Notes,  any event occurs or
      information  becomes  known as a result of which the Final  Memorandum  as
      then  amended or  supplemented  would  include any untrue  statement  of a
      material  fact,  or omit to state a material  fact  necessary  to make the
      statements  therein,  in the light of the  circumstances  under which they
      were made, not  misleading,  or if for any other reason it is necessary at
      any time to amend or  supplement  the  Final  Memorandum  to  comply  with
      applicable  law, the Issuers will promptly  notify the Initial  Purchasers
      thereof and will prepare,  at the expense of the Issuers,  an amendment or
      supplement  to the  Final  Memorandum  that  corrects  such  statement  or
      omission or effects such compliance.

            (d)  The  Issuers  will,  without  charge,  provide  to the  Initial
      Purchasers and to counsel for the Initial Purchasers as many copies of the
      Preliminary  Memorandum  and the  Final  Memorandum  or any  amendment  or
      supplement thereto as the Initial Purchasers may reasonably request.

            (e) The  Issuers  will apply the net  proceeds  from the sale of the
      Securities as set forth under "Use of Proceeds" in the Final Memorandum.

                                    13


<PAGE>




            (f) For so long as any of the  Securities  remain  outstanding,  the
      Issuers will furnish to the Initial  Purchasers  copies of all reports and
      other communications  (financial or otherwise) furnished by the Issuers to
      the  Trustee or to the  holders of the Notes  and,  as soon as  available,
      copies of any reports or financial statements furnished to or filed by the
      Issuers with the Commission or any national  securities  exchange on which
      any class of securities of the Company may be listed.

            (g) Prior to the  Closing  Date,  the  Company  will  furnish to the
      Initial Purchasers,  as soon as they have been prepared, if at all, a copy
      of any available unaudited  consolidated  interim financial  statements of
      the Company and any available  unaudited  interim  consolidated  financial
      statements of CGGS for any period  subsequent to the period covered by the
      most recent  financial  statements  of the Company and CGGS  respectively,
      appearing in the Final Memorandum.

            (h) None of the Issuers or any of their  Affiliates will sell, offer
      for sale or solicit offers to buy or otherwise negotiate in respect of any
      "security" (as defined in the Act) which could be integrated with the sale
      of the Securities in a manner which would require the  registration  under
      the Act of the Securities.

            (i)  The  Issuers   will  not,  and  will  not  permit  any  of  the
      Subsidiaries  to,  engage in any form of general  solicitation  or general
      advertising  (as those  terms are used in  Regulation  D under the Act) in
      connection with the offering of the Securities or in any manner  involving
      a public offering within the meaning of Section 4(2) of the Act.

            (j) For so long as any of the  Securities  remain  outstanding,  the
      Company will make available at its expense, upon request, to any holder of
      such Securities and any prospective  purchasers  thereof,  the information
      specified  in Rule  144A(d)(4)  under the Act,  unless the Company is then
      subject to Section 13 or 15(d) of the Exchange Act.

            (k) The  Issuers  will use their  best  efforts  to (i)  permit  the
      Securities to be designated for trading in the Private Offerings,  Resales
      and Trading through Automated Linkages market (the "PORTAL Market") of the
      NASD and (ii) permit the  Securities  to be  eligible  for  clearance  and
      settlement through The Depository Trust Company.

            (l) In connection with  Securities  offered and sold in an off-shore
      transaction (as defined in Regulation S) the Issuers will not register any
      transfer  of such  Notes not made in  accordance  with the  provisions  of
      Regulation S and will not,  except in  accordance  with the  provisions of
      Regulation  S,  if  applicable,  issue  any  such  Notes  in the  form  of
      definitive securities.

            6. Expenses.  The Issuers agree,  jointly and severally,  to pay all
      costs  and  expenses  incident  to the  performance  of  their  respective

                                     14


<PAGE>



      obligations  under  this  Agreement,   whether  or  not  the  transactions
      contemplated  herein  are  consummated  or this  Agreement  is  terminated
      pursuant to Section 10 hereof,  including all costs and expenses  incident
      to (i) the printing, word processing or other production of documents with
      respect to the transactions  contemplated  hereby,  including any costs of
      printing  the  Preliminary  Memorandum  and the Final  Memorandum  and any
      amendment or supplement  thereto,  and any "Blue Sky" memoranda,  (ii) all
      arrangements  relating to the delivery to the Initial Purchasers of copies
      of the  foregoing  documents,  (iii)  the  fees and  disbursements  of the
      counsel, the accountants and any other experts or advisors retained by the
      Issuers, (iv) preparation  (including printing),  issuance and delivery to
      the Initial  Purchasers of the Securities,  (v) the  qualification  of the
      Securities  under state  securities and "Blue Sky" laws,  including filing
      fees and  reasonable  fees and  disbursements  of counsel  for the Initial
      Purchasers relating thereto, (vi) expenses in connection with any meetings
      with prospective  investors in the Securities,  (vii) fees and expenses of
      the Trustee including reasonable fees and expenses of its counsel,  (viii)
      all expenses and listing fees incurred in connection  with the application
      for  quotation  of the  Securities  on the  PORTAL  Market,  (ix) any fees
      charged by investment rating agencies for the rating of the Securities and
      (x)  all  reasonable  out-of-pocket  expenses  of the  Initial  Purchasers
      (including fees and expenses of Cahill Gordon & Reindel, as counsel to the
      Initial Purchasers).  If the sale of the Securities provided for herein is
      not  consummated  because any condition to the  obligations of the Initial
      Purchasers  set forth in Section 7 hereof is not  satisfied,  because this
      Agreement is terminated or because of any failure, refusal or inability on
      the part of the  Issuers  to  perform  all  obligations  and  satisfy  all
      conditions  on their part to be performed or  satisfied  hereunder  (other
      than  solely by reason of a default  by the  Initial  Purchasers  of their
      obligations  hereunder after all conditions  hereunder have been satisfied
      in accordance  herewith),  the Issuers agree,  jointly and  severally,  to
      promptly   reimburse   the   Initial   Purchasers   upon  demand  for  all
      out-of-pocket  expenses  (including  reasonable  fees,  disbursements  and
      charges of Cahill  Gordon & Reindel,  counsel for the Initial  Purchasers)
      that shall have been incurred by the Initial Purchasers in connection with
      the proposed purchase and sale of the Securities.

            7. Conditions of the Initial Purchasers' Obligations. The obligation
      of the Initial Purchasers to purchase and pay for the Securities shall, in
      their sole  discretion,  be subject to the  satisfaction  or waiver of the
      following conditions on or prior to the Closing Date:

            (a) On the Closing Date, the Initial  Purchasers shall have received
      the  opinion,  dated as of the Closing  Date and  addressed to the Initial
      Purchasers,  of Cox & Smith  Incorporated,  United States  counsel for the
      Issuers,  in form and  substance  satisfactory  to counsel for the Initial
      Purchasers, to the effect that:

                  (i) The Company is duly incorporated,  validly existing and in
            good standing under the laws of its  jurisdiction  of  incorporation
            and has all  requisite  corporate  power  and  authority  to own its
            properties  and to conduct its  business as  described  in the Final
            Memorandum.  The  Company  is duly  qualified  to do  business  as a

                                     15


<PAGE>


            foreign  corporation in good standing in each jurisdiction where the
            ownership  or  leasing  of  its  properties  or the  conduct  of its
            business requires such qualification, except where the failure to be
            so qualified  would not,  individually  or in the aggregate,  have a
            Material Adverse Effect.

                  (ii) As of June 30,  1996,  the  Company  had the  authorized,
            issued  and  outstanding  capitalization  set  forth  in  the  Final
            Memorandum;  all of the  outstanding  shares of capital stock of the
            Issuers and each of the  Subsidiaries  have been duly authorized and
            validly issued,  are fully paid and nonassessable  and, with respect
            to the  Company and  Western,  were not issued in  violation  of any
            preemptive  or  similar  rights;  all of the  outstanding  shares of
            capital  stock  of  Canadian  Abraxas  and  Western  will be  owned,
            directly  or  indirectly,  by the  Company,  free  and  clear of all
            perfected  security interests and, to the knowledge of such counsel,
            free and clear of all other liens, encumbrances, equities and claims
            or restrictions on transferability  (other than those imposed by the
            Act and the securities or "Blue Sky" laws of certain  jurisdictions)
            or voting.

                 (iii) To the knowledge of such counsel,  except as set forth in
            the Final  Memorandum  (A) no options,  warrants or other  rights to
            purchase  from either  Issuer or any of the  Subsidiaries  shares of
            capital stock or ownership  interests in either Issuer or any of the
            Subsidiaries  were  outstanding as of June 30, 1996 other than stock
            options  granted  to  employees,  officers  and  directors,  (B)  no
            agreements  or  other  obligations  to  issue,  or other  rights  to
            convert, any obligation into, or exchange any securities for, shares
            of capital  stock or ownership  interests in either Issuer or any of
            the  Subsidiaries  were  outstanding  as of June 30, 1996 other than
            stock options  granted to employees,  officers and directors and (C)
            no holder of securities of either Issuer or any of the  Subsidiaries
            is entitled to have such securities  registered under a registration
            statement filed pursuant to the Registration Rights Agreement.

                  (iv)  The  Company  has  the  requisite  corporate  power  and
            authority to execute, deliver and perform its obligations under this
            Agreement  and  each  of  the  other  Operative   Documents  and  to
            consummate  the  transactions   contemplated   hereby  and  thereby,
            including,  without limitation, the corporate power and authority to
            issue,  sell and  deliver the  Securities  as  contemplated  by this
            Agreement.  The  Company  has  the  requisite  corporate  power  and
            authority to execute, deliver and perform its obligations under each
            Operative  Document and to consummate the transactions  contemplated
            hereby and thereby.

                   (v) This  Agreement  has been  duly and  validly  authorized,
            executed  and  delivered  by the  Company  and the  Company  has the
            requisite  corporate  power and  authority  to execute,  deliver and
            perform its  obligations  under this Agreement and to consummate the
            transactions contemplated hereby.

                                     16


<PAGE>



                  (vi) The Indenture has been duly and validly authorized by the
            Company and, when duly executed and delivered in accordance with its
            terms  (assuming the due  execution and delivery  thereof by each of
            the parties  thereto other than the Company),  will be the valid and
            legally binding  agreement of the Company,  enforceable  against the
            Company in accordance with its terms,  except as such enforceability
            may be limited by bankruptcy, insolvency, reorganization, moratorium
            and other similar laws now or hereinafter  in effect  relating to or
            affecting   creditors'  rights   generally,   by  general  equitable
            principles  (regardless of whether such enforceability is considered
            in a proceeding in equity or at law) or the  discretion of the court
            before  which  any  proceeding  therefor  may be  brought;  and  the
            Indenture meets the requirements for qualification under the TIA.

                 (vii) The  Notes  have been  duly and  validly  authorized  for
            issuance and sale to the Initial  Purchasers by the Company pursuant
            to this Agreement and, when issued and  authenticated  in accordance
            with the  terms  of the  Indenture  and  delivered  against  payment
            therefor in accordance  with the terms  hereof,  will be the legally
            valid and binding  obligations of the Company,  enforceable  against
            the  Company in  accordance  with their  terms and  entitled  to the
            benefits  of the  Indenture,  except as such  enforceability  may be
            limited by bankruptcy,  insolvency,  reorganization,  moratorium and
            other  similar  laws now or  hereinafter  in effect  relating  to or
            affecting   creditors'  rights   generally,   by  general  equitable
            principles  (regardless of whether such enforceability is considered
            in a proceeding in equity or at law) or the  discretion of the court
            before which any proceeding therefor may be brought.

                (viii) The Exchange Notes have been duly and validly  authorized
            for issuance by the Company and,  when issued and  authenticated  in
            accordance with the terms of the Indenture,  the Registration Rights
            Agreement  and the  Exchange  Offer,  will be the legally  valid and
            binding obligations of the Company,  enforceable against the Company
            in  accordance  with their terms and entitled to the benefits of the
            Indenture,   except  as  such   enforceability  may  be  limited  by
            bankruptcy, insolvency, reorganization, moratorium and other similar
            laws  now  or  hereinafter  in  effect   relating  to  or  affecting
            creditors'  rights  generally,   by  general  equitable   principles
            (regardless  of  whether  such  enforceability  is  considered  in a
            proceeding  in  equity  or at law) or the  discretion  of the  court
            before which any proceeding therefor may be brought.

                  (ix)  The   Registration   Rights   Agreement  has  been  duly
            authorized  by the Company and,  when duly executed and delivered by
            the Company (assuming the due execution and delivery thereof by each
            of the parties thereto other than the Company),  will be the legally
            valid and binding obligation of the Company, enforceable against the
            Company in accordance with its terms,  except as such enforceability
            may be limited by bankruptcy, insolvency, reorganization, moratorium
            and other similar laws now or hereinafter  in effect  relating to or
            affecting   creditors'  rights   generally,   by  general  equitable

                                    17


<PAGE>



            principles  (regardless of whether such enforceability is considered
            in a proceeding in equity or at law) or the  discretion of the court
            before  which any  proceeding  therefor  may be brought  and,  as to
            rights of indemnification and contribution,  by principles of public
            policy or federal or state securities laws relating thereto.

                   (x) The  statements set forth in the Final  Memorandum  under
            the captions  "Business-Regulatory  Matters," "Certain United States
            and Canadian Income Tax Considerations"  and "Certain  Anti-takeover
            Defenses,"  insofar as they address matters of United States,  Texas
            or Nevada law or legal conclusions based on United States,  Texas or
            Nevada law and subject to the limitations set forth therein, insofar
            as such statements  constitute a summary of the matters  referred to
            therein,  fairly and accurately  present the  information  disclosed
            therein in all material respects.

                  (xi)  The   Indenture,   the  Notes,   the   Guarantees,   the
            Registration Rights Agreement and the New Credit Facility conform in
            all material  respects to the descriptions  thereof contained in the
            Final Memorandum.

                 (xii) To such  counsel's  knowledge,  no legal or  governmental
            proceedings are pending or threatened to which either of the Issuers
            or any  Subsidiary  is a party or to which the property or assets of
            either  of the  Issuers  or any  Subsidiary  is  subject,  before or
            brought by any court, arbitrator or government agency or body which,
            if determined  adversely to either of the Issuers or any Subsidiary,
            would  result,  individually  or in  the  aggregate,  in a  Material
            Adverse  Effect,  or which seeks to  restrain,  enjoin,  prevent the
            consummation  of or otherwise  challenge the issuance or sale of the
            Securities  to be sold  hereunder or the  consummation  of the other
            transactions described in the Final Memorandum.

                (xiii) To such counsel's  knowledge,  none of the Issuers or any
            of the Subsidiaries is (A) in violation of its charter or bylaws (or
            similar organizational  document), (B) in breach or violation of any
            statute,  judgment,  decree, order, rule or regulation applicable to
            any of them or any of their respective  properties or assets, except
            for any such breach or violation which would not, individually or in
            the aggregate,  have a Material Adverse Effect,  or (C) in breach of
            or default under (nor has any event occurred  which,  with notice or
            passage of time or both,  would  constitute  a default  under) or in
            violation of any of the terms or provisions of any Contract,  except
            for any such  breach,  default,  violation or event which would not,
            individually or in the aggregate, have a Material Adverse Effect.

                  (xiv) The execution,  delivery and  performance by the Issuers
            of the Purchase Agreement and each of the other Operative  Documents
            (to  the  extent  a  party  thereto)  and  the  consummation  of the
            transactions  contemplated  hereby and thereby  (including,  without
            limitation,  the issuance and sale of the  Securities to the Initial

                                     18


<PAGE>



            Purchasers  and the issuance of the  Exchange  Notes in the Exchange
            Offer), the consummation by the Issuers of the Pending  Acquisitions
            and the  execution,  delivery and  performance by the Company of the
            New Credit  Facility do not conflict with or constitute or result in
            a breach  or a  default  under  (or an event  which  with  notice or
            passage  of  time or both  would  constitute  a  default  under)  or
            violation of or cause an  acceleration  of any obligation  under, or
            result in the imposition or creation of (or the obligation to create
            or impose) a Lien on any  properties or assets of the Company or any
            Subsidiary  with  respect  to (i) the  terms  or  provisions  of any
            Contract  known to such  counsel  to which the  Company  is a party,
            except for any such conflict,  breach,  violation,  default or event
            which would not,  individually or in the aggregate,  have a Material
            Adverse Effect,  (ii) the certificate of incorporation or bylaws (or
            similar organizational  document) of the Company, or (iii) (assuming
            compliance with all applicable  state  securities or "Blue Sky" laws
            and assuming the accuracy of the  representations  and warranties of
            the Initial  Purchasers in Section 8 hereof) any statute,  judgment,
            decree,  order,  rule or  regulation  known  to such  counsel  to be
            applicable to the Company or any of its properties or assets, except
            for  any  such  conflict,  breach  or  violation  which  would  not,
            individually or in the aggregate, have a Material Adverse Effect.

                  (xv) To the  knowledge of such  counsel,  no consent,  waiver,
            approval,   authorization  or  order  of  or  filing,  registration,
            qualification,   license   or   permit  of  or  with  any  court  or
            governmental  agency or body, or third party is required for (i) the
            issuance  and  sale  by the  Issuers  of the  Notes  to the  Initial
            Purchasers  or  the   consummation  by  the  Issuers  of  the  other
            transactions  contemplated  hereby and (ii) the  consummation by the
            Issuers  of  the   transactions   contemplated  by  the  Acquisition
            Agreements,  to the  extent  each is a party  thereto  and (iii) the
            execution  by the  Company  of  the  New  Credit  Facility  and  the
            consummation by the Issuers of each of the transactions contemplated
            by the New Credit  Facility,  except such as may be  required  under
            Blue Sky laws, as to which such counsel need express no opinion, and
            those which have previously been obtained.

                 (xvi) To the knowledge of such  counsel,  there are no legal or
            governmental proceedings involving or affecting either Issuer or the
            Subsidiaries or any of their  respective  properties or assets which
            would be required to be described  in a  prospectus  pursuant to the
            Act that are not so described in the Final Memorandum, nor are there
            any material contracts or other documents which would be required to
            be  described  in a  prospectus  pursuant to the Act that are not so
            described in the Final Memorandum.

                  (xvii) None of the Issuers or any of the  Subsidiaries  is, or
            immediately  after the sale of the  Securities to be sold  hereunder
            and the  application of the proceeds from such sale (as described in
            the Final  Memorandum  under the caption "Use of Proceeds") will be,
            an  "investment  company" as such term is defined in the  Investment

                                     19


<PAGE>



            Company Act of 1940, as amended.

               (xviii)  No  registration  under  the  Act of the  Securities  is
            required  in  connection  with  the  sale of the  Securities  to the
            Initial  Purchasers as  contemplated by this Agreement and the Final
            Memorandum  or  in  connection   with  the  initial  resale  of  the
            Securities by the Initial Purchasers in accordance with Section 8 of
            this Agreement,  and prior to the commencement of the Exchange Offer
            or  the  effectiveness  of the  Shelf  Registration  Statement,  the
            Indenture  is not  required to be  qualified  under the TIA, in each
            case assuming (i) that the purchasers who buy such Securities in the
            initial resale thereof are qualified institutional buyers as defined
            in Rule  144A  promulgated  under  the Act  ("QIBs")  or  accredited
            investors as defined in Rule 501(a) (1), (2), (3) or (7) promulgated
            under the Act  ("Accredited  Investors"),  (ii) the  accuracy of the
            Initial  Purchasers'  representations  in Section 8 and those of the
            Issuers  contained  in this  Agreement  regarding  the  absence of a
            general  solicitation in connection with the sale of such Securities
            to the Initial  Purchasers  and the initial resale thereof and (iii)
            the due performance by the Initial  Purchasers of the agreements set
            forth in Section 8 hereof.

                 (xix) Neither the consummation of the transactions contemplated
            by this Agreement nor the sale,  issuance,  execution or delivery of
            the Securities will violate  Regulation G, T, U or X of the Board of
            Governors of the Federal Reserve System.

            At the  time  the  foregoing  opinion  is  delivered,  Cox &  Smith,
Incorporated  shall  additionally  state that it has participated in conferences
with officers and other  representatives of the Issuers,  representatives of the
independent  public  accountants  for the Issuers,  representatives  of Canadian
counsel for the Issuers,  representatives  of the Initial Purchasers and counsel
for the  Initial  Purchasers,  at which  conferences  the  contents of the Final
Memorandum  and  related  matters  were  discussed,  and,  although  it has  not
independently verified and is not passing upon and assumes no responsibility for
the accuracy,  completeness or fairness of the statements contained in the Final
Memorandum  (except to the extent  specified in subsections (x) and (xi) of this
Section 7(a)), no facts have come to its attention which lead it to believe that
the Final Memorandum,  on the date thereof or at the Closing Date,  contained an
untrue statement of a material fact or omitted to state a material fact required
to be stated therein or necessary to make the statements  contained therein,  in
light of the circumstances  under which they were made, not misleading (it being
understood  that such firm need express no opinion with respect to the financial
statements  and  related  notes  thereto and the other  financial,  engineering,
statistical and accounting data included in the Final Memorandum).

            In rendering the foregoing  opinions,  Cox & Smith  Incorporated may
(i) rely, to the extent such counsel deems proper,  upon the representations and
certifications  of officers of the Issuers or of public  officials and (ii) rely
as to matters  involving the application of laws of any jurisdiction  other than
the  federal  laws of the United  States of America and the laws of the State of

                                     20


<PAGE>



Texas and the corporation law of the State of Nevada, to the extent such counsel
deems proper and  specifies in such  opinion,  upon the opinion of other counsel
who are reasonably satisfactory to counsel for the Initial Purchasers; provided,
however, that Cox & Smith Incorporated shall state that it believes that it, the
Initial  Purchasers  and counsel for the Initial  Purchasers  are  justified  in
relying on such opinion.

            References  to the Final  Memorandum  in this  subsection  (a) shall
      include any amendment or supplement  thereto  prepared in accordance  with
      the provisions of this Agreement at the Closing Date.

            (b) On the Closing Date, the Initial  Purchasers shall have received
      the  opinion,  dated as of the Closing  Date and  addressed to the Initial
      Purchasers,  of Burnet,  Duckworth & Palmer,  Barristers  and  Solicitors,
      Canadian  Counsel for the Issuers,  in form and substance  satisfactory to
      counsel for the Initial Purchasers, to the effect that:

                   (i) Each of Canadian  Abraxas,  Cascade and Grey Wolf is duly
            incorporated,  validly  existing and in good standing under the laws
            of  its  respective   jurisdiction  of  incorporation  and  has  all
            requisite corporate power and authority to own its properties and to
            conduct its business as described in the Final  Memorandum.  Each of
            Canadian  Abraxas,  Cascade and Grey Wolf is duly qualified to carry
            on business  in the  Province  of  Alberta,  Canada,  being the only
            jurisdiction in which such entities do business.

            (ii) All of the  outstanding  shares of  capital  stock of  Canadian
            Abraxas,  Grey Wolf and Cascade  have been duly and validly  issued,
            are  fully  paid  and  non-assessable  and in  respect  of  Canadian
            Abraxas,  to the knowledge of counsel,  were not issued in violation
            of any preemptive or similar  rights.  The Company is the registered
            owner of all of the outstanding  shares of capital stock of Canadian
            Abraxas and the Company is the registered  owner of that  percentage
            of  outstanding  shares of the capital  stock of Grey Wolf as is set
            forth in the Final  Memorandum and Grey Wolf is the registered owner
            of the  capital  stock  of  Cascade  as is  reflected  in the  Final
            Memorandum in the indirect  ownership of the Company in Cascade;  in
            each such case, free and clear of all perfected  security  interests
            registered in the Province of Alberta against the Company, Grey Wolf
            and Cascade.  To the knowledge of such counsel,  except as set forth
            in the Final Memorandum (A) no options,  warrants or other rights to
            purchase  from  Canadian  Abraxas,  Grey Wolf or  Cascade  shares of
            capital stock or ownership interests in Canadian Abraxas,  Grey Wolf
            or Cascade are outstanding, other than as are disclosed in the Final
            Memorandum  and  other  than  stock  options  issued  to  employees,
            officers and  directors,  (B) no agreements or other  obligations to
            issue, or other rights to convert,  any obligation into, or exchange
            any securities for,  shares of capital stock or ownership  interests
            in Canadian Abraxas Grey Wolf or Cascade are outstanding  other than
            stock options issued to employees, officers and directors and (C) no
            holder of  securities of Canadian  Abraxas,  Grey Wolf or Cascade is

                                    21


<PAGE>



            entitled to have such  securities  registered  under a  registration
            statement filed pursuant to the Registration Rights Agreement.

                 (iii) Each of Canadian  Abraxas,  Grey Wolf and Cascade has all
            requisite  corporate  power and  authority  to execute,  deliver and
            perform its  respective  obligations  under this  Agreement  and the
            other  Operative  Documents to which it is a party and to consummate
            the transactions contemplated hereby and thereby, including, without
            limitation,  in respect of Canadian  Abraxas the corporate power and
            authority to issue,  sell and deliver the Securities as contemplated
            by this Agreement.

                  (iv)  This  Agreement  has been duly and  validly  authorized,
            executed and delivered by Canadian Abraxas.

                   (v) The  Indenture  has been duly and validly  authorized  by
            Canadian Abraxas and, when duly executed and delivered in accordance
            with its terms  (assuming the due execution and delivery  thereof by
            the other parties  thereto),  will be the valid and legally  binding
            agreement of Canadian Abraxas,  enforceable against it in accordance
            with its  terms,  except as such  enforceability  may be  limited by
            bankruptcy, insolvency, reorganization, moratorium and other similar
            laws  now  or  hereinafter  in  effect   relating  to  or  affecting
            creditors'  rights  generally,   by  general  equitable   principles
            (regardless  of  whether  such  enforceability  is  considered  in a
            proceeding in equity or at law).

                  (vi) The  Notes  have  been duly and  validly  authorized  for
            issuance  and sale to the Initial  Purchasers  by  Canadian  Abraxas
            pursuant to this  Agreement  and, when issued and  authenticated  in
            accordance  with the terms of the Indenture  and  delivered  against
            payment  therefor in accordance  with the terms hereof,  will be the
            legally  valid  and  binding   obligations   of  Canadian   Abraxas,
            enforceable  against Canadian Abraxas in accordance with their terms
            and  entitled  to the  benefits  of the  Indenture,  except  as such
            enforceability   may   be   limited   by   bankruptcy,   insolvency,
            reorganization, moratorium and other similar laws now or hereinafter
            in effect relating to or affecting  creditors' rights generally,  by
            general   equitable   principles   (regardless   of   whether   such
            enforceability is considered in a proceeding in equity or at law).

                  (vii) The Exchange Notes have been duly and validly authorized
            for issuance by Canadian Abraxas and, when issued and  authenticated
            in  accordance  with the terms of the  Indenture,  the  Registration
            Rights  Agreement and the Exchange Offer,  will be the legally valid
            and binding  obligations of Canadian  Abraxas,  enforceable  against
            Canadian  Abraxas in accordance with their terms and entitled to the
            benefits  of the  Indenture,  except as such  enforceability  may be
            limited by bankruptcy,  insolvency,  reorganization,  moratorium and

                                     22


<PAGE>



            other  similar  laws now or  hereinafter  in effect  relating  to or
            affecting   creditors'  rights   generally,   by  general  equitable
            principles  (regardless of whether such enforceability is considered
            in a proceeding in equity or at law).

                (viii)  The   Registration   Rights   Agreement  has  been  duly
            authorized by Canadian Abraxas and, when duly executed and delivered
            by Canadian Abraxas (assuming the due execution and delivery thereof
            by the other parties thereto), will be the legally valid and binding
            obligation of Canadian Abraxas, enforceable against it in accordance
            with its  terms,  except as such  enforceability  may be  limited by
            bankruptcy, insolvency, reorganization, moratorium and other similar
            laws  now  or  hereinafter  in  effect   relating  to  or  affecting
            creditors'  rights  generally,   by  general  equitable   principles
            (regardless  of  whether  such  enforceability  is  considered  in a
            proceeding   in   equity   or  at  law)   and,   as  to   rights  of
            indemnification,  contribution  and waiver,  by principles of public
            policy or federal or provincial securities laws relating thereto.

                  (ix) To such  counsel's  knowledge,  no legal or  governmental
            proceedings  are pending or threatened to which Canadian  Abraxas or
            Grey Wolf or Cascade is a party or to which the  property  or assets
            of Canadian  Abraxas or Grey Wolf or Cascade is  subject,  before or
            brought by any court, arbitrator or government agency or body which,
            if determined  adversely to Canadian Abraxas,  Grey Wolf or Cascade,
            would  result,  individually  or in  the  aggregate,  in a  Material
            Adverse  Effect,  or which seeks to  restrain,  enjoin,  prevent the
            consummation  of or otherwise  challenge the issuance or sale of the
            Securities  to be sold  hereunder or the  consummation  of the other
            transactions described in the Final Memorandum.

                   (x) To such counsel's knowledge,  none of Canadian Abraxas or
            Grey Wolf or Cascade is (A) in  violation  of its  charter or bylaws
            (or similar organizational  document), (B) in breach or violation of
            any statute,  judgment, decree, order, rule or regulation applicable
            to any of them or any of  their  respective  properties  or  assets,
            except  for  any  such   breach  or   violation   which  would  not,
            individually or in the aggregate, have a Material Adverse Effect, or
            (C) in breach of or default under (nor has any event occurred which,
            with notice or passage of time or both,  would  constitute a default
            under)  or in  violation  of any of the terms or  provisions  of any
            Contract known to such counsel, except for any such breach, default,
            violation  or  event  which  would  not,   individually  or  in  the
            aggregate, have a Material Adverse Effect.

                  (xi) The  execution,  delivery  and  performance  by  Canadian
            Abraxas of the Purchase  Agreement  and each of the other  Operative
            Documents (to the extent a party  thereto) and the  consummation  of
            the transactions contemplated hereby and thereby (including, without
            limitation,  the issuance and sale of the  Securities to the Initial
            Purchasers  and the issuance of the  Exchange  Notes in the Exchange

                                     23


<PAGE>


            Offer),   the  consummation  by  Canadian  Abraxas  of  the  Pending
            Acquisitions  to which  it is a party  do not and will not  conflict
            with or  constitute  or result in a breach or a default under (or an
            event which with notice or passage of time or both would  constitute
            a default  under) or  violation of or cause an  acceleration  of any
            obligation under, or result in the imposition or creation of (or the
            obligation  to create or impose) a Lien on any  properties or assets
            of Canadian  Abraxas,  Grey Wolf or Cascade  with respect to (i) the
            terms or  provisions of any Contract  known to such counsel,  except
            for any such  conflict,  breach,  violation,  default or event which
            would not, individually or in the aggregate, have a Material Adverse
            Effect,  (ii) the certificate of incorporation or bylaws (or similar
            organizational  document) of Canadian Abraxas, Grey Wolf or Cascade,
            or  (iii)  (assuming  the  accuracy  of  the   representations   and
            warranties  of the  Initial  Purchasers  in  Section 8  hereof)  any
            statute,  judgment,  decree, order, rule or regulation known to such
            counsel to be applicable to Canadian Abraxas or Grey Wolf or Cascade
            or any of their respective properties or assets, except for any such
            conflict,  breach or violation  which would not,  individually or in
            the aggregate, have a Material Adverse Effect.

                 (xii) To the  knowledge  of such  counsel no  consent,  waiver,
            approval,   authorization  or  order  of  or  filing,  registration,
            qualification,   license   or   permit  of  or  with  any  court  or
            governmental  agency or body, or third party is required for (i) the
            issuance  and sale by  Canadian  Abraxas of the Notes to the Initial
            Purchasers  or the  consummation  by  Canadian  Abraxas of the other
            transactions  contemplated  hereby  and  (ii)  the  consummation  by
            Canadian Abraxas of the transactions contemplated by the Acquisition
            Agreements  under  the  laws of  Alberta  except  those  which  have
            previously been obtained or made.

                (xiii) The  statements set forth in the final  Memorandum  under
            the  captions  "Business-Regulatory  Matters"  and  "Certain  United
            States  and  Canadian  Income Tax  Considerations,"  insofar as they
            address  matters  of  Alberta  law or the laws of Canada  applicable
            therein and subject to the limitations set forth therein, insofar as
            such  statements  constitute  a summary of the  matters  referred to
            therein,  fairly and accurately  present the  information  disclosed
            therein in all material respects.

                 (xiv) The laws of the  Province of Alberta,  Canada,  permit an
            action to be brought  in a court of  competent  jurisdiction  on any
            final and conclusive  judgment in persona for a sum certain in money
            of a court of the State of New York in favor of persons of a foreign
            jurisdiction, which is not impeachable as void or voidable under the
            internal  laws  of such  foreign  jurisdiction,  for a sum  certain,
            without  reexamination  or relitigation  of the matters  adjudicated
            upon if:

                        a) the Court  rendering such judgment had  jurisdiction,
                  in  accordance  with Alberta  conflict of law rules,  over the

                                    24


<PAGE>


                  judgment  debtor (and  submission  by Canadian  Abraxas to the
                  jurisdiction  of the New York Court  pursuant to the Operative
                  Documents will suffice for this purpose).

                        b) such  judgment  was not  obtained  by  fraud  or in a
                  manner contrary to natural justice and the enforcement thereof
                  would  not be  contrary  to  public  policy,  as such  term is
                  understood  under the laws of Alberta and the federal  laws of
                  Canada applicable therein;

                        c) the enforcement of such judgment does not constitute,
                  directly or indirectly,  the enforcement of foreign  revenues,
                  expropriation, penal or public laws;

                        d) no new admissible  evidence relevant to the action is
                  discovered  prior to the  rendering of judgment by the Alberta
                  Court; and

                        e) the  action to enforce  such  judgment  is  commenced
                  within 10 years after the date of such judgment.

                  (xv) In the  event  that any of the  Operative  Documents  are
            sought to be enforced in any action or proceeding in the Province of
            Alberta,  Canada,  in  accordance  with the laws of the State of New
            York, the courts of the Province of Alberta, Canada, would recognize
            the choice of laws and would apply the laws of the State of New York
            in any such action or proceeding,  upon  appropriate  evidence as to
            such laws being  adduced,  provided  that none of the  provisions of
            such agreements or  instruments,  as the case may be, or of the laws
            of the State of New York are contrary to public policy, as such term
            is understood under the law of the Province of Alberta,  Canada and,
            an  Alberta  court  will not apply  those  laws of New York which it
            characterizes as being of a revenue, expropriatory,  penal or public
            law nature and in matters of procedure,  the laws of Alberta will be
            applied.

            At the time the foregoing opinion is delivered,  Burnet, Duckworth &
      Palmer,  Barristers and Solicitors shall  additionally state that although
      it has not  independently  verified and is not passing upon and assumes no
      responsibility   for  the  accuracy,   completeness  or  fairness  of  the
      statements  contained  in the  Final  Memorandum  (except  to  the  extent
      specified in subsection  (xiv),  no facts have come to its attention which
      lead it to believe  that the Final  Memorandum,  on the date thereof or at
      the Closing  Date,  contained an untrue  statement  of a material  fact or
      omitted  to  state a  material  fact  required  to be  stated  therein  or
      necessary  to make  the  statements  contained  therein,  in  light of the
      circumstances  under  which  they  were  made,  not  misleading  (it being
      understood  that such firm need  express  no opinion  with  respect to the
      financial  statements  and related notes thereto and the other  financial,
      statistical and accounting data included in the Final Memorandum).

                                     25


<PAGE>



            In rendering the  foregoing  opinions,  Burnet,  Duckworth & Palmer,
      Barristers  and  Solicitors  may rely,  to the extent such  counsel  deems
      proper,  upon the  representations  and  certifications of officers of the
      Issuers or of public  officials  and shall not be required to opine on the
      effect of any  statutes or laws of the United  States and may restrict its
      opinion  to the laws of the  Province  of  Alberta  and the laws of Canada
      applicable therein.

            References  to the Final  Memorandum  in this  subsection  (a) shall
      include any amendment or supplement  thereto  prepared in accordance  with
      the provisions of this Agreement at the Closing Date.

            (c) On the Closing Date, the Initial  Purchasers shall have received
      the opinion, in form and substance satisfactory to the Initial Purchasers,
      dated as of the Closing Date and addressed to the Initial  Purchasers,  of
      Cahill Gordon & Reindel, counsel for the Initial Purchasers,  with respect
      to certain legal matters relating to this Agreement and such other related
      matters as the Initial  Purchasers  may reasonably  require.  In rendering
      such  opinion,  Cahill  Gordon & Reindel  shall have received and may rely
      upon such  certificates  and other  documents  and  information  as it may
      reasonably request to pass upon such matters.

            (d) The Initial  Purchasers shall have received from each of Ernst &
      Young LLP, Deloitte & Touche LLP and KPMG Chartered  Accountants a comfort
      letter or letters  dated the date hereof and the Closing Date, in form and
      substance satisfactory to counsel for the Initial Purchasers.

            (e) The  representations  and warranties of the Issuers contained in
      this Agreement  shall be true and correct in all material  respects on and
      as of the date hereof and on and as of the Closing  Date as if made on and
      as of the Closing  Date;  the  statements  of the Issuers'  officers  made
      pursuant to any  certificate  delivered in accordance  with the provisions
      hereof shall be true and correct in all material respects on and as of the
      date  made and on and as of the  Closing  Date;  the  Issuers  shall  have
      performed  all covenants and  agreements  and satisfied all  conditions on
      their  part to be  performed  or  satisfied  hereunder  at or prior to the
      Closing Date; and, except as described in the Final Memorandum  (exclusive
      of any amendment or supplement thereto after the date hereof),  subsequent
      to the  date  of the  most  recent  financial  statements  in  such  Final
      Memorandum,  there  shall  have  been  no  event  or  development,  and no
      information  shall  have  become  known,  that,  individually  or  in  the
      aggregate,  has or would be reasonably  likely to have a Material  Adverse
      Effect.

            (f) The  sale of the  Securities  hereunder  shall  not be  enjoined
      (temporarily or permanently) on the Closing Date.

            (g) Subsequent to the date of the most recent  financial  statements
      in the Final Memorandum  (exclusive of any amendment or supplement thereto
      after the date  hereof),  none of the  Issuers or any of the  Subsidiaries
      shall have sustained any loss or interference with respect to its business
      or properties  from fire,  flood,  hurricane,  accident or other calamity,

                                     26


<PAGE>


      whether or not covered by insurance,  or from any strike,  labor  dispute,
      slow down or work stoppage or from any legal or  governmental  proceeding,
      order  or  decree,  which  loss or  interference,  individually  or in the
      aggregate,  has or would be reasonably  likely to have a Material  Adverse
      Effect.

            (h) The Initial  Purchasers shall have received a certificate of the
      Company,  dated the Closing  Date,  signed on behalf of the Company by its
      Chairman  of the Board,  President  or any Senior Vice  President  and the
      Chief Financial Officer, to the effect that:

                   (i)  The   representations  and  warranties  of  the  Issuers
            contained  in this  Agreement  are true and correct on and as of the
            date hereof and on and as of the Closing Date,  and the Issuers have
            performed all covenants and  agreements and satisfied all conditions
            on their part to be performed or satisfied  hereunder at or prior to
            the Closing Date;

                  (ii) At the Closing  Date,  since the date hereof or since the
            date of the most recent financial statements in the Final Memorandum
            (exclusive  of any  amendment or  supplement  thereto after the date
            hereof),  no event or development  has occurred,  and no information
            has become known,  that,  individually  or in the aggregate,  has or
            would be reasonably likely to have a Material Adverse Effect; and

                  (iii)  The  sale of the  Securities  hereunder  has  not  been
            enjoined (temporarily or permanently).

            (i) On the Closing Date, the Initial  Purchasers shall have received
      the Registration Rights Agreement executed by each of the Issuers and such
      agreement  shall be in full  force and  effect at all times from and after
      the Closing Date.

            (j) The Company  shall have  delivered  to the Initial  Purchasers a
      true,  correct and complete copy of the New Credit  Facility;  the Company
      and the other  parties  thereto  shall have executed and delivered the New
      Credit  Facility and satisfied all  conditions  precedent to any borrowing
      thereunder; and the New Credit Facility shall be in full force and effect.

            (k) The Issuers  shall have  delivered  to the Initial  Purchasers a
      true, correct and complete copy of each of the Acquisition Agreements; the
      Issuers  (to the extent  each is a party  thereto)  and the other  parties
      thereto shall have executed and delivered the Acquisition Agreements;  all
      conditions precedent to the Pending Acquisitions shall have been satisfied
      or waived;  and each of the Acquisition  Agreements shall be in full force
      and effect.

            (l) On or prior to the Closing  Date,  the sale by CGGS of the Nevis
      Plant (as defined in the Memorandum) shall have been consummated.

                                     27


<PAGE>



            (m) The  closing  in  respect  of the New  Credit  Facility  and the
      Pending Acquisitions,  including the merger of CGGS with and into Canadian
      Abraxas,  shall  occur  simultaneously  with the closing in respect of the
      purchase and sale of the Securities hereunder.

            (n) On or before  the  Closing  Date,  the  Initial  Purchasers  and
      counsel  for the  Initial  Purchasers  shall have  received  such  further
      documents,  opinions,  certificates,  letters and schedules or instruments
      relating to the business,  corporate,  legal and financial  affairs of the
      Issuers as they shall have heretofore reasonably requested.

            (o) On the Closing Date, the Initial  Purchasers shall have received
      letters,  dated  as of the  Closing  Date  and  addressed  to the  Initial
      Purchasers  of,  DeGolyer & MacNaughton  and Sproule  Associates  Limited,
      independent petroleum engineers for the Company and CGGS, respectively, in
      form and substance satisfactory to counsel for the Initial Purchasers.

            All such documents,  opinions,  certificates,  letters, schedules or
instruments delivered pursuant to this Agreement will comply with the provisions
hereof only if they are reasonably  satisfactory in all material respects to the
Initial  Purchasers  and counsel for the Initial  Purchasers.  The Issuers shall
furnish to the  Initial  Purchasers  such  conformed  copies of such  documents,
opinions, certificates, letters, schedules and instruments in such quantities as
the Initial Purchasers shall reasonably request.

            8. Offering of Securities;  Restrictions on Transfer. (a)Each of the
Initial Purchasers represents and warrants (as to itself only) that it is a QIB.
Each of the Initial  Purchasers agrees with the Issuers (as to itself only) that
(i) it has not and will not solicit offers for, or offer or sell, the Securities
by any form of general  solicitation or general  advertising (as those terms are
used in Regulation D under the Act) or in any manner involving a public offering
within the meaning of Section  4(2) of the Act; and (ii) it has and will solicit
offers for the Securities  only from, and will offer the Securities  only to (A)
in the case of offers  inside the United  States,  (x) persons  whom the Initial
Purchasers  reasonably  believe to be QIBs or, if any such  person is buying for
one or more institutional  accounts for which such person is acting as fiduciary
or agent,  only when such person has represented to the Initial  Purchasers that
each such  account  is a QIB,  to whom  notice  has been given that such sale or
delivery  is  being  made in  reliance  on Rule  144A,  and,  in each  case,  in
transactions  under  Rule  144A or (y) a limited  number of other  institutional
investors  reasonably  believed  by  the  Initial  Purchasers  to be  Accredited
Investors  that,  prior to their  purchase  of the  Securities,  deliver  to the
Initial  Purchasers a letter containing the  representations  and agreements set
forth in Annex A to the Final  Memorandum  and (B) in the case of offers outside
the United States,  to persons other than U.S.  persons  ("foreign  purchasers,"
which term shall include dealers or other professional fiduciaries in the United
States acting on a discretionary basis for foreign beneficial owners (other than
an estate or trust));  provided,  however, that, in the case of this clause (B),
in purchasing such  Securities  such persons are deemed to have  represented and
agreed as provided under the caption  "Transfer  Restrictions"  contained in the
Final Memorandum (or, if the Final  Memorandum is not in existence,  in the most

                                     28


<PAGE>



recent Memorandum).

            (b) Each of the Initial  Purchasers  represents  and warrants (as to
itself only) with respect to offers and sales outside the United States that (i)
it has and  will  comply  with  all  applicable  laws  and  regulations  in each
jurisdiction in which it acquires,  offers,  sells or delivers Securities or has
in its possession or distributes any Memorandum or any such other  material,  in
all cases at its own expense including,  without limitation, that the Securities
have not been and will not be offered or sold to  residents  of the  Province of
Alberta,  Canada;  (ii) the Securities  have not been and will not be offered or
sold  within the United  States or to, or for the  account or benefit  of,  U.S.
persons except in accordance  with  Regulation S under the Act or pursuant to an
exemption from the  registration  requirements  of the Act; (iii) it has offered
the  Securities  and  will  offer  and sell  the  Securities  (A) as part of its
distribution  at any time and (B) otherwise until 40 days after the later of the
commencement  of the offering and the Closing Date, only in accordance with Rule
903 of Regulation S and,  accordingly,  neither it nor any persons acting on its
behalf have engaged or will engage in any directed  selling  efforts (within the
meaning of  Regulation S) with respect to the  Securities,  and any such persons
have  complied and will comply with the  offering  restrictions  requirement  of
Regulation S; and (iv) it agrees that, at or prior to  confirmation  of sales of
the  Securities,  it will  have  sent  to each  distributor,  dealer  or  person
receiving  a  selling  concession,  fee or  other  remuneration  that  purchases
Securities  from it during the  restricted  period a  confirmation  or notice to
substantially the following effect:

      "The Securities  covered hereby have not been registered  under the United
      States  Securities  Act of  1933  (the  "Securities  Act")  and may not be
      offered  and sold  within the United  States or to, or for the  account or
      benefit of, U.S. persons (i) as part of the distribution of the Securities
      at any  time or (ii)  otherwise  until  40 days  after  the  later  of the
      commencement of the offering and the closing date of the offering,  except
      in either case in accordance with Regulation S (or Rule 144A if available)
      under the Securities  Act. Terms used above have the meaning given to them
      in Regulation S."

Terms  used in this  Section  8(b) and not  defined in this  Agreement  have the
meanings given to them in Regulation S.

            (c) Each of the Initial  Purchasers  represents  and warrants (as to
itself only) that the source of funds being used by it to acquire the Securities
does not include the assets of any  "employee  benefit plan" (within the meaning
of Section 3 of ERISA) or any "plan"  (within the meaning of Section 4975 of the
Code).

            9.   Indemnification  and  Contribution.   (a)The  Issuers  and  any
Subsidiary  Guarantors  agree,  jointly and  severally,  to  indemnify  and hold
harmless the Initial  Purchasers,  their affiliates and each person, if any, who
controls  any Initial  Purchaser  within the meaning of Section 15 of the Act or
Section  20 of  the  Exchange  Act,  against  any  losses,  claims,  damages  or
liabilities to which any Initial Purchaser or such controlling person may become
subject  under the Act,  the  Exchange  Act or  otherwise,  insofar  as any such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon:

                                     29


<PAGE>




             (i)  any  untrue  statement  or  alleged  untrue  statement  of any
      material fact  contained in any  Memorandum or any amendment or supplement
      thereto  or  any  application  or  other  document,  or any  amendment  or
      supplement   thereto,   executed  by  an  Issuer  or  based  upon  written
      information  furnished  by  or  on  behalf  of  an  Issuer  filed  in  any
      jurisdiction  in order to qualify the  Securities  under the securities or
      "Blue  Sky" laws  thereof  or filed  with any  securities  association  or
      securities exchange (each an "Application"); or

            (ii) the omission or alleged omission to state, in any Memorandum or
      any amendment or supplement  thereto or any  Application,  a material fact
      required to be stated therein or necessary to make the statements therein,
      in the  light  of the  circumstances  under  which  they  were  made,  not
      misleading,

and will reimburse, as incurred, the Initial Purchasers, each such affiliate and
each  such  controlling  person  for any  reasonable  legal or other  reasonable
expenses incurred by the Initial Purchasers,  such affiliate or such controlling
person in connection  with  investigating,  defending  against or appearing as a
third-party witness in connection with any such loss, claim,  damage,  liability
or action;  provided,  however,  that the Issuers and the Subsidiary  Guarantors
will not be liable (i) in any such case to the extent that any such loss, claim,
damage,  or  liability  arises out of or is based upon any untrue  statement  or
alleged untrue  statement or omission or alleged omission made in any Memorandum
or any amendment or supplement  thereto or any  Application in reliance upon and
in  conformity  with  written  information  concerning  the  Initial  Purchasers
furnished to an Issuer by the Initial Purchasers specifically for use therein or
(ii) with  respect to the  Preliminary  Memorandum,  to the extent that any such
loss,  claim,  damage or liability  arises solely from the fact that the Initial
Purchasers  sold  Securities to a person to whom there was not sent or given, on
or  prior  to the  written  confirmation  of  such  sale,  a copy  of the  Final
Memorandum,  as amended and  supplemented,  if the Issuers shall have previously
furnished  copies  thereof to the Initial  Purchasers  in  accordance  with this
Agreement  and the Final  Memorandum,  as amended and  supplemented,  would have
corrected any such untrue statement or omission.  This indemnity  agreement will
be in addition to any liability that the Issuers and the  Subsidiary  Guarantors
may otherwise have to the  indemnified  parties.  The Issuers and the Subsidiary
Guarantors  shall not be liable under this Section 9 for any  settlement  of any
claim or action effected without their prior written consent, which shall not be
unreasonably withheld.

            The Initial  Purchasers shall not, without the prior written consent
of the Issuers, effect any settlement or compromise of any pending or threatened
proceeding  in respect  of which any  Issuer is or could  have been a party,  or
indemnity could have been sought hereunder by any Issuer, unless such settlement
(A)  included  an  unconditional  written  release of the  Issuers,  in form and
substance reasonably  satisfactory to the Issuers,  from all liability on claims
that are the  subject  matter of such  proceeding  and (B) does not  include any
statement as to an admission  of fault,  culpability  or failure to act by or on
behalf of any Issuer.

                                     30


<PAGE>



            (b) The Initial  Purchasers  agree,  severally  and not jointly,  to
indemnify and hold  harmless the Issuers and the  Subsidiary  Guarantors,  their
respective  directors and their respective officers and each person, if any, who
controls an Issuer  within the meaning of Section 15 of the Act or Section 20 of
the Exchange Act against any losses,  claims, damages or liabilities to which an
Issuer or any of the  Subsidiary  Guarantors  or any such  director,  officer or
controlling  person  may  become  subject  under the Act,  the  Exchange  Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect  thereof)  arise out of or are based  upon (i) any untrue  statement  or
alleged untrue statement of any material fact contained in any Memorandum or any
amendment or supplement thereto or any Application,  or (ii) the omission or the
alleged  omission to state  therein a material fact required to be stated in any
Memorandum  or any  amendment  or  supplement  thereto  or any  Application,  or
necessary  to make the  statements  therein,  in the light of the  circumstances
under which they were made, not misleading, in each case to the extent, but only
to the  extent,  that such  untrue  statement  or alleged  untrue  statement  or
omission or alleged  omission was made in reliance upon and in  conformity  with
written information concerning such Initial Purchaser, furnished to an Issuer by
such  Initial  Purchaser  specifically  for  use  therein;  and  subject  to the
limitation set forth  immediately  preceding  this clause,  will  reimburse,  as
incurred, any reasonable legal or other expenses incurred by an Issuer or any of
the Subsidiary Guarantors or any such director, officer or controlling person in
connection with investigating or defending against or appearing as a third party
witness in connection with any such loss, claim, damage,  liability or action in
respect thereof.  This indemnity  agreement will be in addition to any liability
that the Initial Purchasers may otherwise have to the indemnified  parties.  The
Initial  Purchasers  shall not be liable under this Section 9 for any settlement
of any  claim or action  effected  without  their  consent,  which  shall not be
unreasonably withheld.

            The  Issuers  shall not,  without the prior  written  consent of the
Initial  Purchasers,  effect any  settlement  or  compromise  of any  pending or
threatened proceeding in respect of which any Initial Purchaser is or could have
been a party,  or  indemnity  could have been  sought  hereunder  by any Initial
Purchaser,  unless such settlement (A) includes an unconditional written release
of the Initial Purchasers,  in form and substance reasonably satisfactory to the
Initial Purchasers,  from all liability on claims that are the subject matter of
such  proceeding  and (B) does not include any  statement  as to an admission of
fault, culpability or failure to act by or on behalf of any Initial Purchaser.

            (c)  Promptly  after  receipt  by an  indemnified  party  under this
Section 9 of notice of the commencement of any action for which such indemnified
party is  entitled to  indemnification  under this  Section 9, such  indemnified
party will, if a claim in respect thereof is to be made against the indemnifying
party under this Section 9, notify the  indemnifying  party of the  commencement
thereof in writing;  but the  omission to so notify the  indemnifying  party (i)
will not relieve the  indemnifying  party from any liability under paragraph (a)
or (b) above unless and to the extent such failure  results in the forfeiture by
the indemnifying  party of substantial rights and defenses and (ii) will not, in
any  event,   relieve  the  indemnifying  party  from  any  obligations  to  any
indemnified  party  other  than  the  indemnification   obligation  provided  in
paragraphs  (a) and (b) above.  In case any such  action is brought  against any
indemnified  party, and it notifies the  indemnifying  party of the commencement

                                     31


<PAGE>


thereof,  the indemnifying party will be entitled to participate therein and, to
the extent that it may wish, jointly with any other indemnifying party similarly
notified, to assume the defense thereof, with counsel reasonably satisfactory to
such indemnified party; provided, however, that if (i) the use of counsel chosen
by the indemnifying  party to represent the indemnified party would present such
counsel  with a conflict of  interest,  (ii) the  defendants  in any such action
include  both  the  indemnified  party  and  the  indemnifying   party  and  the
indemnified  party shall have been  advised by counsel  that there may be one or
more legal defenses  available to it and/or other  indemnified  parties that are
different from or additional to those  available to the  indemnifying  party, or
(iii)  the  indemnifying  party  shall  not  have  employed  counsel  reasonably
satisfactory to the indemnified  party to represent the indemnified party within
a  reasonable  time  after  receipt by the  indemnifying  party of notice of the
institution  of such action,  then, in each such case,  the  indemnifying  party
shall not have the right to direct the  defense of such action on behalf of such
indemnified  party or parties and such  indemnified  party or parties shall have
the right to select  separate  counsel to defend  such  action on behalf of such
indemnified party or parties.  After notice from the indemnifying  party to such
indemnified  party of its election so to assume the defense thereof and approval
by such  indemnified  party of counsel  appointed  to defend  such  action,  the
indemnifying  party  will not be liable to such  indemnified  party  under  this
Section  9 for any  legal or other  expenses,  other  than  reasonable  costs of
investigation,  subsequently  incurred by such  indemnified  party in connection
with the defense thereof,  unless (i) the indemnified  party shall have employed
separate  counsel in accordance  with the proviso to the  immediately  preceding
sentence (it being understood,  however, that in connection with such action the
indemnifying  party  shall  not be  liable  for the  expenses  of more  than one
separate  counsel (in  addition to local  counsel) in any one action or separate
but substantially  similar actions in the same  jurisdiction  arising out of the
same general allegations or circumstances,  designated by the Initial Purchasers
in the case of  paragraph  (a) of this  Section 9 or the  Issuers in the case of
paragraph (b) of this Section 9, representing the indemnified parties under such
paragraph  (a) or  paragraph  (b),  as the case may be, who are  parties to such
action or actions) or (ii) the indemnifying  party has authorized in writing the
employment  of  counsel  for  the  indemnified  party  at  the  expense  of  the
indemnifying  party.  After  such  notice  from the  indemnifying  party to such
indemnified  party, the indemnifying  party will not be liable for the costs and
expenses of any  settlement of such action  effected by such  indemnified  party
without the prior written consent of the indemnifying party (which consent shall
not be unreasonably  withheld),  unless such indemnified party waived in writing
its rights under this Section 9, in which case the indemnified  party may effect
such a settlement without such consent.

            (d) In circumstances in which the indemnity  agreement  provided for
in the preceding paragraphs of this Section 9 is unavailable to, or insufficient
to hold harmless, an indemnified party in respect of any losses, claims, damages
or liabilities  (or actions in respect  thereof),  each  indemnifying  party, in
order to provide for just and equitable  contribution,  shall  contribute to the
amount  paid or payable by such  indemnified  party as a result of such  losses,
claims,  damages  or  liabilities  (or  actions  in  respect  thereof)  in  such
proportion as is  appropriate to reflect (i) the relative  benefits  received by
the indemnifying  party or parties on the one hand and the indemnified  party on
the other from the offering of the Securities or (ii) if the allocation provided

                                     32


<PAGE>



by the foregoing  clause (i) is not  permitted by applicable  law, not only such
relative  benefits  but also the  relative  fault of the  indemnifying  party or
parties  on the one hand and the  indemnified  party on the other in  connection
with the  statements  or  omissions  or alleged  statements  or  omissions  that
resulted in such losses,  claims,  damages or liabilities (or actions in respect
thereof).  The relative benefits received by the Issuers on the one hand and any
Initial  Purchaser on the other shall be deemed to be in the same  proportion as
the total proceeds from the offering (before deducting expenses) received by the
Issuers bear to the total  discounts  and  commissions  received by such Initial
Purchaser.  The relative  fault of the parties  shall be determined by reference
to,  among other  things,  whether the untrue or alleged  untrue  statement of a
material  fact or the  omission  or alleged  omission  to state a material  fact
relates to information  supplied by the Issuers on the one hand, or such Initial
Purchaser  on the other,  the parties'  relative  intent,  knowledge,  access to
information  and opportunity to correct or prevent such statement or omission or
alleged   statement  or  omission,   and  any  other  equitable   considerations
appropriate in the  circumstances.  The Issuers and the Initial Purchasers agree
that  it  would  not be  equitable  if the  amount  of  such  contribution  were
determined  by pro rata or per  capita  allocation  or by any  other  method  of
allocation that does not take into account the equitable considerations referred
to in the  first  sentence  of this  paragraph  (d).  Notwithstanding  any other
provision of this paragraph (d), no Initial Purchaser shall be obligated to make
contributions  hereunder  that in the  aggregate  exceed  the  total  discounts,
commissions and other compensation received by such Initial Purchaser under this
Agreement,  less the aggregate amount of any damages that such Initial Purchaser
has  otherwise  been  required to pay by reason of the untrue or alleged  untrue
statements or the omissions or alleged  omissions to state a material  fact, and
no person guilty of fraudulent  misrepresentation (within the meaning of Section
11(f) of the Act) shall be entitled to contribution  from any person who was not
guilty of such fraudulent misrepresentation. For purposes of this paragraph (d),
each  affiliate of an Initial  Purchaser,  each person,  if any, who controls an
Initial  Purchaser  within the meaning of Section 15 of the Act or Section 20 of
the  Exchange  Act shall have the same  rights to  contribution  as the  Initial
Purchasers,  and each director of an Issuer,  each officer of an Issuer and each
person,  if any, who controls an Issuer  within the meaning of Section 15 of the
Act  or  Section  20 of  the  Exchange  Act,  shall  have  the  same  rights  to
contribution as the Issuers.

            10. Survival  Clause.  The respective  representations,  warranties,
agreements,  covenants,  indemnities and other statements of the Issuers,  their
respective  officers and the Initial  Purchasers  set forth in this Agreement or
made by or on behalf of them  pursuant to this  Agreement  shall  remain in full
force and effect,  regardless of (i) any  investigation  made by or on behalf of
the  Issuers,  any of  their  respective  officers  or  directors,  the  Initial
Purchasers or any  controlling  person  referred to in Section 9 hereof and (ii)
delivery  of  and  payment  for  the  Securities.   The  respective  agreements,
covenants,  indemnities  and other  statements set forth in Sections 6, 9 and 15
hereof shall remain in full force and effect,  regardless of any  termination or
cancellation of this Agreement.

            11.  Termination.  (a)This  Agreement  may be terminated in the sole
discretion of the Initial Purchasers by notice to the Issuers given prior to the
Closing Date in the event that either of the Issuers shall have failed,  refused
or been unable to perform all obligations and satisfy all conditions on its part

                                    33


<PAGE>


to be performed or satisfied hereunder at or prior thereto or, if at or prior to
the Closing Date:

             (i)  either  of the  Issuers  shall  have  sustained  any  loss  or
      interference  with  respect to its  businesses  or  properties  from fire,
      flood,  hurricane,  accident or other calamity,  whether or not covered by
      insurance,  or from any strike, labor dispute,  slow down or work stoppage
      or any legal or governmental  proceeding,  which loss or interference,  in
      the sole  judgment  of the Initial  Purchasers,  has had or has a Material
      Adverse  Effect,  or there  shall have been,  in the sole  judgment of the
      Initial Purchasers,  any event or development that, individually or in the
      aggregate,  has or could be reasonably  likely to have a Material  Adverse
      Effect  (including  without  limitation  a change in control of any of the
      Issuers  or the  Subsidiaries),  except in each case as  described  in the
      Final Memorandum (exclusive of any amendment or supplement thereto);

            (ii) trading in securities generally on the New York Stock Exchange,
      American  Stock  Exchange or the NASDAQ  National  Market  shall have been
      suspended or minimum or maximum prices shall have been  established on any
      such exchange or market;

           (iii)  a  banking moratorium shall have been declared by New York or
      United States authorities;

            (iv)  there  shall  have  been  (A) an  outbreak  or  escalation  of
      hostilities  between the United  States and any foreign  power,  or (B) an
      outbreak  or  escalation  of any  other  insurrection  or  armed  conflict
      involving  the  United  States  or any  other  national  or  international
      calamity or emergency, or (C) any material change in the financial markets
      of the United  States  which,  in the case of (A), (B) or (C) above and in
      the sole judgment of the Initial  Purchasers,  makes it  impracticable  or
      inadvisable to proceed with the offering or the delivery of the Securities
      as contemplated by the Final Memorandum; or

             (v) any  securities  of the Issuers  shall have been  downgraded or
      placed on any "watch  list" for  possible  downgrading  by any  nationally
      recognized statistical rating organization.

            (b) Termination of this Agreement  pursuant to this Section 11 shall
be without  liability  of any party to any other  party  except as  provided  in
Section 10 hereof.

            12. Information  Supplied by the Initial Purchasers.  The statements
set  forth  in the last  paragraph  on the  front  cover  page and in the  third
paragraph  and the first,  third and seventh  sentences  of the fifth  paragraph
under the heading  "Private  Placement" in the Final  Memorandum  (to the extent
such  statements  relate  to  the  Initial   Purchasers)   constitute  the  only
information  furnished by the Initial Purchasers to the Issuers for the purposes
of  Sections  2(a) and 9 hereof and the  Initial  Purchasers  confirm  that such
statements are correct as of the date hereof and as of the Closing Date.

                                     34


<PAGE>



            13. Notices.  All communications  hereunder shall be in writing and,
if sent to the Initial Purchasers, shall be mailed or delivered to BT Securities
Corporation, 130 Liberty Street, New York, New York 10006, Attention:  Corporate
Finance Department,  with a copy to Cahill Gordon & Reindel, 80 Pine Street, New
York, New York 10005,  Attention:  Daniel J. Zubkoff;  if sent to the Issuers or
the Subsidiary  Guarantors,  if any, shall be mailed or delivered to the Issuers
at 500 North Loop 1604 East,  Suite 100,  San Antonio,  Texas 78232,  Attention:
Robert L.G.  Watson,  with a copy to Cox & Smith  Incorporated,  112 East Pecan,
Suite 1800, San Antonio, Texas 78205, Attention: Steven Jacobs.

            All such  notices  and  communications  shall be deemed to have been
duly given: when delivered by hand, if personally delivered;  five business days
after being deposited in the mail, postage prepaid,  if mailed; and one business
day after being timely delivered to a next-day air courier.

            14. Successors.  This Agreement shall inure to the benefit of and be
binding upon the Initial Purchasers,  the Issuers and the Subsidiary Guarantors,
if any, and their respective successors and legal  representatives,  and nothing
expressed or  mentioned  in this  Agreement is intended or shall be construed to
give any other person any legal or equitable right,  remedy or claim under or in
respect of this Agreement,  or any provisions herein  contained;  this Agreement
and all conditions and provisions  hereof being intended to be and being for the
sole and  exclusive  benefit  of such  persons  and for the  benefit of no other
person  except  that  (i) the  indemnities  of the  Issuers  and the  Subsidiary
Guarantors,  if any,  contained in Section 9 of this Agreement shall also be for
the benefit of any person or persons who control an Initial Purchaser within the
meaning of Section 15 of the Act or Section 20 of the  Exchange Act and (ii) the
indemnities of the Initial  Purchasers  contained in Section 9 of this Agreement
shall also be for the benefit of the directors of the Issuers and the Subsidiary
Guarantors,  if any,  their  respective  officers  and any person or persons who
control an Issuer  within the  meaning of Section 15 of the Act or Section 20 of
the Exchange Act. No purchaser of Securities from the Initial Purchasers will be
deemed a successor because of such purchase.

            15.  APPLICABLE  LAW.  THE  VALIDITY  AND   INTERPRETATION  OF  THIS
AGREEMENT,  AND THE TERMS AND  CONDITIONS  SET FORTH HEREIN SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO
CONTRACTS MADE AND TO BE PERFORMED WHOLLY THEREIN,  WITHOUT GIVING EFFECT TO ANY
PROVISIONS THEREOF RELATING TO CONFLICTS OF LAW.

            16.  Counterparts.  This  Agreement  may be  executed in two or more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

            17.  Miscellaneous.  If, on the  Closing  Date,  any of the  Initial
Purchasers  shall fail or refuse to  purchase  Securities  that it has agreed to
purchase  hereunder on such date, and the aggregate  amount of Securities  which
such defaulting  Initial  Purchaser agreed but failed and refused to purchase is
not more than ten percent of the aggregate  amount of Securities to be purchased

                                     35


<PAGE>


on such date,  the other Initial  Purchasers  shall be obligated to purchase the
Securities which such defaulting  Initial Purchaser agreed but failed or refused
to purchase on such date. If, on the Closing Date, any Initial  Purchaser  shall
fail or refuse to purchase  Securities which it agreed to purchase  hereunder on
such date and the  aggregate  amount of  Securities  with  respect to which such
default occurs is more than ten percent of the aggregate amount of Securities to
be purchased on such date and  arrangements  satisfactory  to the  nondefaulting
Initial  Purchasers and the Company for the purchase of such  Securities are not
made within 36 hours after such default,  this Agreement shall terminate without
liability on the part of any nondefaulting Initial Purchasers or of the Company,
except as  provided  in Section  10. In any such case  either the  nondefaulting
Initial  Purchaser  or the Company  shall have the right to postpone the Closing
Date,  but in no event for longer  than seven days,  in order that the  required
changes,  if  any,  in  the  Final  Memorandum  or in  any  other  documents  or
arrangements  may be effected.  Any action taken under this paragraph  shall not
relieve  any  defaulting  Initial  Purchaser  from  liability  in respect to any
default of such Initial Purchaser under this Agreement.

            18.  Agent  for  Service;  Submission  to  Jurisdiction;  Waiver  of
Immunities.  By the execution and delivery of this Agreement,  Canadian  Abraxas
(i)  acknowledges  that it has, by separate written  instrument,  designated and
appointed CT Corporation  System,  1633 Broadway,  New York, New York 10019 (and
any successor entity),  as its authorized agent upon which process may be served
in any suit or  proceeding  arising out of or relating  to this  Agreement,  the
Registration Rights Agreement,  the Securities,  the Exchange Notes, the Private
Exchange  Notes,  if any, or the Indenture that may be instituted in any Federal
or state  court in the State of New York,  The City of New York,  the Borough of
Manhattan,  or brought under Federal or state  securities laws, and acknowledges
that CT Corporation  System has accepted such  designation,  (ii) submits to the
non-exclusive  jurisdiction of any such court in any such suit or proceeding and
(iii)  agrees that  service of process  upon CT  Corporation  System and written
notice of said service to Canadian  Abraxas in accordance  with Section 13 shall
be deemed in every respect effective service of process upon Canadian Abraxas in
any such suit or proceeding. Canadian Abraxas further agrees to take any and all
action,  including the  execution  and filing of any and all such  documents and
instruments, as may be necessary to continue such designation and appointment of
CT Corporation System in full force and effect so long as any of the Securities,
the Exchange  Notes,  the Private  Exchange Notes, if any, shall be outstanding;
provided that Canadian Abraxas may, by written notice to the Initial Purchasers,
designate such additional or alternative agent for service of process under this
Section 18 that (i) maintains an office located in the Borough of Manhattan, The
City of New York in the  State of New  York;  (ii) is  either  (x)  counsel  for
Canadian  Abraxas or (y) a  corporate  service  company  which acts as agent for
service of process for other persons in the ordinary  course of its business and
(iii)  agrees to act as agent for  service of process  in  accordance  with this
Section  18.  Such  written  notice  shall  identify  the name of such agent for
service of process  and the  address of the office of such agent for  service of
process in the Borough of Manhattan, The City of New York, State of New York.

            19. Subsidiary  Guarantor a Party.  Immediately upon the designation

                                    36


<PAGE>


of any Subsidiary of either Issuer as a Restricted Subsidiary (as defined in the
Indenture),  the Issuers shall cause such Subsidiary to become a party hereto as
a Subsidiary  Guarantor by executing and delivering to the Initial  Purchasers a
counterpart hereof.

            If the  foregoing  correctly  sets forth our  understanding,  please
indicate your  acceptance  thereof in the space provided below for that purpose,
whereupon this letter shall constitute a binding  agreement  between the Issuers
and the Initial Purchasers.

                                    Very truly yours,

                          ABRAXAS PETROLEUM CORPORATION


                                    By:
                                          Name:
                                          Title:


                                    CANADIAN ABRAXAS PETROLEUM LIMITED


                                    By:
                                          Name:
                                          Title:

The  foregoing  Agreement is hereby  confirmed and accepted as of the date first
above written.

BT SECURITIES CORPORATION


By:   __________________________
      Name:
      Title:


JEFFERIES & COMPANY INC.


By:   __________________________
      Name:
      Title:



                                     37


<PAGE>



ING BARINGS (U.S.) SECURITIES CORPORATION


By:   __________________________
      Name:
      Title:


BANKERS TRUST INTERNATIONAL PLC


By:   __________________________
      Name:
      Title:


            Each of the  undersigned by its execution  hereof agrees to become a
party to this  Agreement  as a  Subsidiary  Guarantor as of the date first above
written:


                                    By:
                                          Name:
                                          Title:


                                     38


<PAGE>



                                   SCHEDULE I



                 Subsidiaries of Abraxas Petroleum Corporation


Grey Wolf Exploration Ltd.
Cascade Oil & Gas Ltd.
Western Associated Energy Corporation





<PAGE>


                                   SCHEDULE II



                                                                  Principal
                                                                  Amount of
Initial Purchaser                                                    Notes

BT Securities Corporation...................................   $ 85,250,000

Bankers Trust International PLC.............................   $ 11,500,000

Jefferies & Company Inc.....................................   $ 96,750,000

ING Barings (U.S.) Securities
  Corporation ..............................................   $ 21,500,000
                                                               ------------

     Total..................................................   $215,000,000




<PAGE>



                 REGISTRATION RIGHTS AGREEMENT

                        Dated as of November 14, 1996

                                 By and Among

                        ABRAXAS PETROLEUM CORPORATION

                                     and

                     CANADIAN ABRAXAS PETROLEUM LIMITED,

                                  as Issuers

                                     and

                          BT SECURITIES CORPORATION,
                          JEFFERIES & COMPANY, INC.,
                       BANKERS TRUST INTERNATIONAL PLC
                  ING BARING (U.S.) SECURITIES CORPORATION,
                            as Initial Purchasers


                          11 1/2% Senior Notes due 2004






<PAGE>



                               TABLE OF CONTENTS


                                                                          Page

1.    Definitions.......................................................    1

2.    Exchange Offer....................................................    5

3.    Shelf Registration................................................    9

4.    Additional Interest...............................................   11

5.    Registration Procedures...........................................   13

6.    Registration Expenses.............................................   25

7.    Indemnification...................................................   26

8.    Rules 144 and 144A................................................   31

9.    Underwritten Registrations........................................   31

10.   Miscellaneous.....................................................   32

      (a)   No Inconsistent Agreements..................................   32
      (b)   Adjustments Affecting Registrable Notes.....................   32
      (c)   Amendments and Waivers......................................   32
      (d)   Notices.....................................................   33
      (e)   Successors and Assigns......................................   33
      (f)   Release of Subsidiary Guarantors............................   34
      (g)   Counterparts................................................   34
      (h)   Headings....................................................   34
      (i)   Governing Law...............................................   34
      (j)   Severability................................................   34
      (k)   Securities Held by the Issuers or Their
               Affiliates...............................................   34
      (l)   Third Party Beneficiaries...................................   34
      (m)   Entire Agreement............................................   35
      (n)   Information Supplied by the Participants....................   35
      (o)   Subsidiary Guarantor a Party................................   35


                                     i


<PAGE>






                         REGISTRATION RIGHTS AGREEMENT

            This Registration  Rights Agreement (the "Agreement") is dated as of
November  14,  1996,  by and  among  ABRAXAS  PETROLEUM  CORPORATION,  a  Nevada
corporation (the  "Company"),  and CANADIAN ABRAXAS  PETROLEUM  LIMITED,  Canada
corporation  and a wholly owned  subsidiary of the Company  ("Canadian  Abraxas"
and, together with the Company,  the "Issuers"),  as issuers,  and BT SECURITIES
CORPORATION,  BANKERS TRUST INTERNATIONAL PLC, JEFFERIES & COMPANY, INC. and ING
BARING  (U.S.)  SECURITIES  CORPORATION,  as initial  purchasers  (the  "Initial
Purchasers").

            This  Agreement  is entered  into in  connection  with the  Purchase
Agreement,  dated as of  November  14,  1996,  by and among the  Issuers and the
Initial  Purchasers (the "Purchase  Agreement"),  which provides for the sale by
the Issuers to the Initial Purchasers of $215,000,000 aggregate principal amount
of the  Issuer's 11 1/2% Senior  Notes due 2004 (the  "Notes"),  unconditionally
guaranteed  on a  senior  basis  by  each  of the  Company's  future  Restricted
Subsidiaries  (as  defined  in the  Indenture)  (collectively,  the  "Subsidiary
Guarantors").  In order to  induce  the  Initial  Purchasers  to enter  into the
Purchase  Agreement,  the Issuers have agreed to provide the registration rights
set forth in this  Agreement for the benefit of the Initial  Purchasers  and any
subsequent  holder or holders of the Notes.  The  execution and delivery of this
Agreement is a condition to the Initial  Purchasers'  obligation to purchase the
Notes under the Purchase Agreement.

            The parties hereby agree as follows:

1.    Definitions

            As used in this  Agreement,  the  following  terms  shall  have  the
following meanings:

            Additional Interest:  See Section 4 hereof.

            Advice:  See Section 5 hereof.

            Agreement:  See the introductory paragraphs hereto.

            Applicable Period:  See Section 2 hereof.

            Canadian Abraxas:  See the introductory paragraphs hereto.

            Company:  See the introductory paragraphs hereto.

            Effectiveness Date: With respect to any Registration Statement,  the
75th day after the Filing Date with respect thereto.

                                     1
145391.01


<PAGE>





            Effectiveness Period:  See Section 3 hereof.

            Event Date:  See Section 4 hereof.

            Exchange Act: The Securities  Exchange Act of 1934, as amended,  and
the rules and regulations of the SEC promulgated thereunder.

            Exchange Notes:  See Section 2 hereof.

            Exchange Offer:  See Section 2 hereof.

            Exchange Offer Registration Statement:  See Section 2 hereof.

            Filing Date: (A) If no Registration  Statement has been filed by the
Company pursuant to this Agreement, the 45th day after the Issue Date; provided,
however, that if a Shelf Notice is given within 10 days of the Filing Date, then
the Filing Date with respect to the Initial Shelf Registration shall be the 15th
calendar day after the date of the giving of such Shelf Notice;  and (B) in each
other case (which may be  applicable  notwithstanding  the  consummation  of the
Exchange Offer), the 30th day after the delivery of a Shelf Notice.

            Holder:  Any holder of a Registrable Note or Registrable Notes.

            Indemnified Person:  See Section 7(c) hereof.

            Indemnifying Person:  See Section 7(c) hereof.

            Indenture:  The  Indenture,  dated as of November 14,  1996,  by and
among the Issuers and IBJ SCHRODER BANK & TRUST COMPANY, as trustee, pursuant to
which the Notes are being  issued,  as the same may be amended  or  supplemented
from time to time in accordance with the terms thereof.

            Initial Purchasers:  See the introductory paragraphs hereto.

            Initial Shelf Registration:  See Section 3(a) hereof.

            Inspectors:  See Section 5(o) hereof.

            Issue Date:  November 6, 1996, the date of original  issuance of the
Notes.

            Issuers:  See the introductory paragraphs hereto.

            NASD:  See Section 5(t) hereof.

            Participant:  See Section 7(a) hereof.


                                     2
145391.01


<PAGE>





            Participating Broker-Dealer:  See Section 2 hereof.

            Person:  An individual,  trustee,  corporation,  partnership,  joint
stock company, trust, unincorporated  association,  union, business association,
firm or other legal entity.

            Private Exchange:  See Section 2 hereof.

            Private Exchange Notes:  See Section 2 hereof.

            Prospectus:  The prospectus  included in any Registration  Statement
(including,  without  limitation,  any  prospectus  subject to completion  and a
prospectus  that includes any information  previously  omitted from a prospectus
filed as part of an effective  registration statement in reliance upon Rule 430A
promulgated  under the  Securities Act and any term sheet filed pursuant to Rule
434 under the  Securities  Act), as amended or  supplemented  by any  prospectus
supplement,  and  all  other  amendments  and  supplements  to  the  Prospectus,
including post-effective  amendments, and all material incorporated by reference
or deemed to be incorporated by reference in such Prospectus.

            Purchase Agreement:  See the introductory paragraphs hereof.

            Records:  See Section 5(o) hereof.

            Registrable  Notes:  Each Note upon its original issuance and at all
times subsequent thereto, each Exchange Note as to which Section 2(c)(iv) hereof
is applicable  upon original  issuance and at all times  subsequent  thereto and
each  Private  Exchange  Note upon  original  issuance  thereof and at all times
subsequent thereto, until (i) a Registration Statement (other than, with respect
to any Exchange  Note as to which Section  2(c)(iv)  hereof is  applicable,  the
Exchange  Offer  Registration  Statement)  covering such Note,  Exchange Note or
Private  Exchange  Note has been  declared  effective  by the SEC and such Note,
Exchange  Note or such  Private  Exchange  Note,  as the case  may be,  has been
disposed of in accordance with such effective Registration Statement,  (ii) such
Note has been  exchanged  pursuant to the Exchange Offer for an Exchange Note or
Exchange  Notes that may be resold without  restriction  under state and federal
securities laws, (iii) such Note, Exchange Note or Private Exchange Note, as the
case may be, ceases to be outstanding for purposes of the Indenture or (iv) such
Note,  Exchange Note or Private Exchange Note, as the case may be, may be resold
without restriction pursuant to Rule 144 under the Securities Act.

            Registration  Statement:  Any registration  statement of the Issuers
and the  Subsidiary  Guarantors  (if any)  that  covers  any of the  Notes,  the
Exchange  Notes or the  Private  Exchange  Notes  filed  with the SEC  under the
Securities  Act,  including the  Prospectus,  amendments and supplements to such
registration statement,  including post-effective  amendments, all exhibits, and
all material incorporated by reference or deemed to be incorporated by reference
in such registration statement.


                                     3
145391.01


<PAGE>





            Rule 144: Rule 144  promulgated  under the  Securities  Act, as such
Rule may be amended  from time to time,  or any  similar  rule  (other than Rule
144A) or regulation  hereafter adopted by the SEC providing for offers and sales
of  securities  made in  compliance  therewith  resulting in offers and sales by
subsequent holders that are not affiliates of an issuer of such securities being
free of the registration and prospectus delivery  requirements of the Securities
Act.

            Rule 144A: Rule 144A  promulgated  under the Securities Act, as such
Rule may be amended from time to time, or any similar rule (other than Rule 144)
or regulation hereafter adopted by the SEC.

            Rule 415: Rule 415  promulgated  under the  Securities  Act, as such
Rule  may be  amended  from  time to time,  or any  similar  rule or  regulation
hereafter adopted by the SEC.

            SEC:  The Securities and Exchange Commission.

            Securities  Act: The  Securities  Act of 1933,  as amended,  and the
rules and regulations of the SEC promulgated thereunder.

            Shelf Notice:  See Section 2 hereof.

            Shelf Registration:  See Section 3(b) hereof.

            Subsequent Shelf Registration:  See Section 3(b) hereof.

            TIA:  The Trust Indenture Act of 1939, as amended.

            Trustee:  The trustee  under the  Indenture and the trustee (if any)
under any indenture governing the Exchange Notes and Private Exchange Notes.

            Underwritten  registration or underwritten  offering: A registration
in which  securities of the Issuers are sold to an underwriter for reoffering to
the public.

2.    Exchange Offer

            (a)  To  the  extent  permitted  by  applicable  law  or  applicable
interpretation  of the staff of the Division of Corporation  Finance of the SEC,
the  Issuers  shall  file  with  the SEC,  no later  than  the  Filing  Date,  a
Registration  Statement  (the  "Exchange  Offer  Registration  Statement") on an
appropriate  registration form with respect to a registered offer (the "Exchange
Offer") to exchange any and all of the  Registrable  Notes for a like  aggregate
principal amount of notes (the "Exchange Notes") of the Issuers (the guarantees,
if any,  of the  Subsidiary  Guarantors)  that  are  identical  in all  material
respects to the Notes except that the  Exchange  Notes (and the  guarantees,  if
any, of the Subsidiary  Guarantors) shall contain no restrictive legend thereon.
The Exchange Offer shall comply with all

                                     4
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<PAGE>





applicable  tender offer rules and regulations  under the Exchange Act and other
applicable law. The Issuers shall use their respective best efforts to (x) cause
the Exchange Offer  Registration  Statement to be declared  effective  under the
Securities Act on or before the Effectiveness  Date; (y) keep the Exchange Offer
open for at least 30 days (or longer if  required by  applicable  law) after the
date that notice of the Exchange Offer is mailed to Holders;  and (z) consummate
the Exchange  Offer on or prior to the 135th day following the date on which the
Exchange  Offer  Registration  Statement  is declared  effective by the SEC. If,
after the Exchange Offer Registration  Statement is initially declared effective
by the SEC, the Exchange Offer or the issuance of the Exchange Notes  thereunder
is interfered  with by any stop order,  injunction or other order or requirement
of the SEC or any  other  governmental  agency  or  court,  the  Exchange  Offer
Registration Statement shall be deemed not to have become effective for purposes
of this Agreement.

            Each Holder that participates in the Exchange Offer will be required
to represent  that any  Exchange  Notes to be received by it will be acquired in
the ordinary course of its business, that at the time of the consummation of the
Exchange Offer such Holder will have no arrangement  or  understanding  with any
Person to participate in the  distribution of the Exchange Notes in violation of
the provisions of the  Securities  Act, and that such Holder is not an affiliate
of any of the Issuers within the meaning of the Securities Act.

            Upon  consummation  of the Exchange  Offer in  accordance  with this
Section 2, the  provisions of this Agreement  shall  continue to apply,  mutatis
mutandis,  solely with respect to  Registrable  Notes that are Private  Exchange
Notes,  Exchange  Notes as to which Section  2(c)(iv) is applicable and Exchange
Notes held by Participating  Broker-Dealers (as defined),  and the Issuers shall
have no further  obligation  to register  Registrable  Notes (other than Private
Exchange  Notes and other  than in  respect  of any  Exchange  Notes as to which
clause 2(c)(iv) hereof applies) pursuant to Section 3 hereof.

            No securities other than the Exchange Notes shall be included in the
Exchange Offer Registration Statement.

            (b) The Issuers shall include within the Prospectus contained in the
Exchange Offer Registration Statement a section entitled "Plan of Distribution,"
reasonably acceptable to the Holders, which shall contain a summary statement of
the positions taken or policies made by the staff of the SEC with respect to the
potential "underwriter" status of any broker-dealer that is the beneficial owner
(as defined in Rule 13d-3 under the Exchange Act) of Exchange  Notes received by
such  broker-dealer  in the Exchange  Offer (a  "Participating  Broker-Dealer"),
whether such positions or policies have been publicly  disseminated by the staff
of the SEC or such positions or policies  represent the prevailing  views of the
staff of the SEC.  Such "Plan of  Distribution"  section  shall  also  expressly
permit,  to the extent  permitted by applicable  policies and regulations of the
SEC, the use of the Prospectus by all Persons subject to the prospectus delivery
requirements  of the  Securities  Act,  including,  to the extent  permitted  by
applicable   policies   and   regulations   of  the   SEC,   all   Participating
Broker-Dealers,   and  include  a  statement   describing  the  means  by  which

                                     5
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<PAGE>




Participating  Broker-Dealers  may resell the Exchange Notes in compliance  with
the Securities Act.

            The  Issuers  shall use their  respective  best  efforts to keep the
Exchange Offer Registration  Statement effective and to amend and supplement the
Prospectus  contained  therein in order to permit such Prospectus to be lawfully
delivered by all Persons subject to the prospectus delivery  requirements of the
Securities Act for such period of time as is necessary to comply with applicable
law in  connection  with any  resale  of the  Exchange  Notes  covered  thereby;
provided,  however,  that such  period  shall not  exceed  180 days  after  such
Exchange  Offer  Registration  Statement is declared  effective  (or such longer
period if extended  pursuant  to the last  paragraph  of Section 5 hereof)  (the
"Applicable Period").

            If, prior to consummation  of the Exchange  Offer,  any Holder holds
any  Notes  acquired  by it that  have,  or that  are  reasonably  likely  to be
determined  to  have,   the  status  of  an  unsold   allotment  in  an  initial
distribution,  or any Holder is not  entitled  to  participate  in the  Exchange
Offer, the Issuers upon the request of any such Holder shall simultaneously with
the delivery of the Exchange Notes in the Exchange  Offer,  issue and deliver to
any such Holder, in exchange (the "Private Exchange") for such Notes held by any
such Holder, a like principal amount of notes (the "Private  Exchange Notes") of
the Issuers that are  identical in all material  respects to the Exchange  Notes
and the  Subsidiary  Guarantors  if any shall  guarantee  such Private  Exchange
Notes. The Private Exchange Notes shall be issued pursuant to the same indenture
as the Exchange Notes and bear the same CUSIP number as the Exchange Notes.

            Interest on the Exchange  Notes and the Private  Exchange Notes will
accrue  from  (A) the  later  of (i) the  last  interest  payment  date on which
interest was paid on the Notes  surrendered in exchange  therefor or (ii) if the
Notes are  surrendered  for  exchange on a date in a period  which  includes the
record date for an interest  payment  date to occur on or after the date of such
exchange  and as to  which  interest  will be paid,  the  date of such  interest
payment date or (B) if no interest has been paid on the Notes,  from the date of
the original issuance of the Notes.

            In connection with the Exchange Offer, the Issuers shall:

            (1)  mail,  or  cause  to be  mailed,  to each  Holder  entitled  to
      participate in the Exchange Offer a copy of the Prospectus forming part of
      the Exchange Offer  Registration  Statement,  together with an appropriate
      letter of transmittal and related documents;

            (2) keep the Exchange Offer open for not less than 30 days after the
      date that notice of the Exchange  Offer is mailed to Holders (or longer if
      required by applicable law);

            (3) utilize the services of a depositary for the Exchange Offer with
      an address in the Borough of Manhattan, The City of New York;


                                     6
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<PAGE>





      
            (4) permit  Holders to withdraw  tendered Notes at any time prior to
      the close of business,  New York time,  on the last  business day on which
      the Exchange Offer shall remain open; and

            (5) otherwise  comply in all material  respects with all  applicable
      laws, rules and regulations.

            As soon as practicable after the close of the Exchange Offer and the
Private Exchange, if any, the Issuers shall:

            (1) accept for exchange all Registrable  Notes validly  tendered and
      not  validly  withdrawn  pursuant  to the  Exchange  Offer and the Private
      Exchange, if any;

            (2) deliver to the Trustee for cancellation all Registrable Notes so
      accepted for exchange; and

            (3) cause the Trustee to authenticate  and deliver  promptly to each
      Holder of Notes, Exchange Notes or Private Exchange Notes, as the case may
      be, equal in principal  amount to the Notes of such Holder so accepted for
      exchange.

            The Exchange Offer and the Private  Exchange shall not be subject to
any conditions,  other than that (i) the Exchange Offer or Private Exchange,  as
the  case  may  be,  does  not  violate   applicable   law  or  any   applicable
interpretation  of the staff of the SEC, (ii) no action or proceeding shall have
been instituted or threatened in any court or by any  governmental  agency which
might materially  impair the ability of the Issuers to proceed with the Exchange
Offer or the Private  Exchange,  and no material adverse  development shall have
occurred in any existing  action or  proceeding  with respect to the Issuers and
(iii) all governmental  approvals shall have been obtained,  which approvals the
Issuers deem  necessary for the  consummation  of the Exchange  Offer or Private
Exchange.

            The Exchange  Notes and the Private  Exchange  Notes shall be issued
under (i) the Indenture or (ii) an indenture  identical in all material respects
to the Indenture and which,  in either case, has been qualified under the TIA or
is exempt from such  qualification  and shall  provide that the  Exchange  Notes
shall not be subject to the transfer  restrictions  set forth in the  Indenture.
The  Indenture or such  indenture  shall  provide that the Exchange  Notes,  the
Private  Exchange  Notes and the Notes  shall vote and  consent  together on all
matters as one class and that none of the Exchange Notes,  the Private  Exchange
Notes or the Notes will have the right to vote or consent as a separate class on
any matter.

            (c) If, (i) because of any change in law or in currently  prevailing
interpretations of the staff of the SEC, the Issuers are not permitted to effect
the Exchange Offer,  (ii) the Exchange Offer is not consummated  within 150 days
of the Issue  Date,  (iii) any holder of Private  Exchange  Notes so requests in
writing to the Issuers  within 60 days after the  consummation  of the  Exchange

                                     7
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<PAGE>





Offer,  or (iv) in the case of any  Holder  that  participates  in the  Exchange
Offer,  such Holder does not receive  Exchange Notes on the date of the exchange
that may be sold without  restriction  under state and federal  securities  laws
(other  than due solely to the status of such Holder as an  affiliate  of any of
the  Issuers  within the  meaning of the  Securities  Act) and so  notifies  the
Issuers   within  30  days  after  such  Holder  first  becomes  aware  of  such
restrictions,  in the case of each of clauses (i) to and including  (iv) of this
sentence, then the Issuers shall promptly deliver to the Holders and the Trustee
written notice thereof (the "Shelf Notice") and shall file a Shelf  Registration
pursuant to Section 3 hereof.

3.    Shelf Registration

            If at any  time a Shelf  Notice  is  delivered  as  contemplated  by
Section 2(c) hereof, then:

            (a)  Shelf  Registration.  The  Issuers  shall  file  with the SEC a
Registration Statement for an offering to be made on a continuous basis pursuant
to Rule 415 covering all of the Registrable  Notes not exchanged in the Exchange
Offer, Private Exchange Notes and Exchange Notes as to which Section 2(c)(iv) is
applicable  (the  "Initial  Shelf  Registration").  The Issuers  shall use their
respective  diligent  best  efforts  to file  with  the SEC  the  Initial  Shelf
Registration  on or  before  the  applicable  Filing  Date.  The  Initial  Shelf
Registration  shall  be on  Form  S-1 or  another  appropriate  form  permitting
registration  of such  Registrable  Notes for resale by Holders in the manner or
manners  designated  by  them  (including,   without  limitation,  one  or  more
underwritten offerings).  The Issuers shall not permit any securities other than
the  Registrable  Notes to be included in the Initial Shelf  Registration or any
Subsequent Shelf Registration (as defined below).

            The Issuers  shall use their  respective  best  efforts to cause the
Initial Shelf  Registration to be declared effective under the Securities Act on
or prior to the  Effectiveness  Date and to keep the Initial Shelf  Registration
continuously  effective  under the  Securities Act until the date which is three
years from the  Effectiveness  Date,  subject to extension  pursuant to the last
paragraph  of Section 5 hereof (the  "Effectiveness  Period"),  or such  shorter
period  ending  when (i) all  Registrable  Notes  covered by the  Initial  Shelf
Registration  have been sold in the manner set forth and as  contemplated in the
Initial Shelf Registration or (ii) a Subsequent Shelf Registration  covering all
of the  Registrable  Notes  covered  by and not sold  under  the  Initial  Shelf
Registration  or an earlier  Subsequent  Shelf  Registration  has been  declared
effective under the Securities Act;  provided,  however,  that the Effectiveness
Period in respect of the  Initial  Shelf  Registration  shall be extended to the
extent  required  to permit  dealers to comply  with the  applicable  prospectus
delivery  requirements  of Rule 174 under the  Securities  Act and as  otherwise
provided  herein  and shall be  subject  to  reduction  to the  extent  that the
applicable provisions of Rule 144 are amended or revised.

            No holder of  Registrable  Notes may include any of its  Registrable
Notes in any Shelf Registration  Statement pursuant to this Agreement unless and
until such holder  furnishes  to the  Issuers in  writing,  within 30 days after

                                     8
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<PAGE>





receipt of a request  therefor,  such  information as the Issuers may reasonably
request  for  use  in  connection  with  any  Shelf  Registration  Statement  or
Prospectus or preliminary  prospectus included therein. No holder of Registrable
Notes  shall be  entitled to  Additional  Interest  pursuant to Section 4 hereof
unless and until such holder shall have provided all such  reasonably  requested
information. Each holder of Registrable Notes as to which any Shelf Registration
Statement  is being  effected  agrees to furnish  promptly  to the  Issuers  all
information  required to be  disclosed in order to make  information  previously
furnished to the Issuers by such Holder not materially misleading.

            (b)   Subsequent   Shelf   Registrations.   If  the  Initial   Shelf
Registration or any Subsequent Shelf Registration ceases to be effective for any
reason at any time during the  Effectiveness  Period  (other than because of the
sale of all of the  securities  registered  thereunder),  the Issuers  shall use
their  respective  best  efforts to obtain the  prompt  withdrawal  of any order
suspending the effectiveness  thereof,  and in any event shall within 30 days of
such cessation of effectiveness amend the Initial Shelf Registration in a manner
to obtain the withdrawal of the order suspending the effectiveness  thereof,  or
file an additional "shelf" Registration  Statement pursuant to Rule 415 covering
all of the  Registrable  Notes  covered by and not sold under the Initial  Shelf
Registration or an earlier  Subsequent Shelf  Registration  (each, a "Subsequent
Shelf  Registration").  If a Subsequent Shelf Registration is filed, the Issuers
shall  use  their   respective  best  efforts  to  cause  the  Subsequent  Shelf
Registration  to be  declared  effective  under  the  Securities  Act as soon as
practicable  after such filing and to keep such  subsequent  Shelf  Registration
continuously  effective  for a  period  equal  to  the  number  of  days  in the
Effectiveness  Period less the aggregate number of days during which the Initial
Shelf   Registration  or  any  Subsequent  Shelf   Registration  was  previously
continuously  effective.  As used herein the term "Shelf Registration" means the
Initial Shelf Registration and any Subsequent Shelf Registration.

            (c)  Supplements   and   Amendments.   The  Issuers  shall  promptly
supplement  and  amend  any  Shelf   Registration  if  required  by  the  rules,
regulations or instructions  applicable to the  registration  form used for such
Shelf  Registration,  if  required  by  the  Securities  Act,  or if  reasonably
requested  by the Holders of a majority  in  aggregate  principal  amount of the
Registrable Notes covered by such  Registration  Statement or by any underwriter
of such Registrable Notes.

4.    Additional Interest

            (a) The Issuers and the  Initial  Purchasers  agree that the Holders
will  suffer  damages if the Issuers  fail to fulfill  their  obligations  under
Section 2 or Section 3 hereof and that it would not be feasible to ascertain the
extent of such damages with precision.  Accordingly,  the Issuers agree, jointly
and severally,  to pay, as liquidated damages,  additional interest on the Notes
("Additional  Interest")  under the  circumstances  and to the  extent set forth
below (each of which shall be given independent effect):

            (i) if (A) neither the Exchange Offer Registration Statement nor the
      Initial Shelf  Registration  has been filed on or prior to the  applicable

                                     9
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<PAGE>




      Filing Date or (B)  notwithstanding  that the Issuers have  consummated or
      will  consummate  the Exchange  Offer,  the Issuers are required to file a
      Shelf Registration and such Shelf Registration is not filed on or prior to
      the Filing Date applicable thereto,  then, commencing on the day after any
      such Filing Date, Additional Interest shall accrue on the principal amount
      of the  Notes  at a rate  of  0.50%  per  annum  for  the  first  90  days
      immediately  following each such Filing Date, and such Additional Interest
      rate shall  increase by an additional  0.50% per annum at the beginning of
      each subsequent 90-day period; or

            (ii) if (A) neither the Exchange  Offer  Registration  Statement nor
      the Initial  Shelf  Registration  is declared  effective  by the SEC on or
      prior to the relevant  Effectiveness Date or (B) notwithstanding  that the
      Issuers  have  consummated  or will  consummate  the Exchange  Offer,  the
      Issuers  are  required  to  file  a  Shelf  Registration  and  such  Shelf
      Registration  is not  declared  effective  by the SEC on or  prior  to the
      Effectiveness Date in respect of such Shelf Registration, then, commencing
      on the day after such Effectiveness Date, Additional Interest shall accrue
      on the principal  amount of the Notes at a rate of 0.50% per annum for the
      first 90 days immediately following the day after such Effectiveness Date,
      and such  Additional  Interest rate shall increase by an additional  0.50%
      per annum at the beginning of each subsequent 90-day period; or

           (iii) if (A) the Issuers have not  exchanged  Exchange  Notes for all
      Notes validly  tendered in accordance with the terms of the Exchange Offer
      on or prior to the 135th day  after the date on which the  Exchange  Offer
      Registration  Statement  relating thereto was declared effective or (B) if
      applicable,  a Shelf  Registration  has been  declared  effective and such
      Shelf  Registration  ceases  to  be  effective  at  any  time  during  the
      Effectiveness  Period,  then  Additional  Interest  shall  accrue  on  the
      principal  amount  of the Notes at a rate of 0.50% per annum for the first
      90 days  commencing on the (x) 151st day after such effective date, in the
      case of (A)  above,  or (y) the day such Shelf  Registration  ceases to be
      effective  in the case of (B) above,  and such  Additional  Interest  rate
      shall  increase by an additional  0.50% per annum at the beginning of each
      such subsequent 90-day period;

provided, however, that the Additional Interest rate on the Notes may not exceed
at any one time in the aggregate 1.50% per annum;  provided,  further,  however,
that (1) upon the filing of the applicable Exchange Offer Registration Statement
or the  applicable  Shelf  Registration  as required  hereunder  (in the case of
clause (i) above of this Section 4), (2) upon the  effectiveness of the Exchange
Offer Registration  Statement or the applicable Shelf Registration  Statement as
required  hereunder  (in the case of clause (ii) of this Section 4), or (3) upon
the exchange of the  applicable  Exchange  Notes for all Notes  tendered (in the
case of clause  (iii)(A) of this  Section 4), or upon the  effectiveness  of the
applicable Shelf Registration Statement which had ceased to remain effective (in
the case of (iii)(B) of this  Section  4),  Additional  Interest on the Notes in
respect of which such events  relate as a result of such clause (or the relevant
subclause thereof), as the case may be, shall cease to accrue.

                                     10
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<PAGE>







            (b) The Issuers  shall  notify the Trustee  within one  business day
after  each  and  every  date on  which  an event  occurs  in  respect  of which
Additional  Interest is required  to be paid (an "Event  Date").  Any amounts of
Additional Interest due pursuant to (a)(i),  (a)(ii) or (a)(iii) of this Section
4 will be payable  in cash  semi-annually  on each May 1 and  November 1 (to the
holders of record on the April 15 and  October  15  immediately  preceding  such
dates),  commencing with the first such date occurring after any such Additional
Interest  commences  to  accrue.  The  amount  of  Additional  Interest  will be
determined  by  multiplying  the  applicable  Additional  Interest  rate  by the
principal  amount  of the  Registrable  Notes,  multiplied  by a  fraction,  the
numerator  of which is the  number of days  such  Additional  Interest  rate was
applicable  during  such  period  (determined  on the  basis of a  360-day  year
comprised  of twelve  30-day  months  and, in the case of a partial  month,  the
actual number of days elapsed), and the denominator of which is 360.

5.    Registration Procedures

            In connection with the filing of any Registration Statement pursuant
to Sections 2 or 3 hereof, the Issuers shall effect such registrations to permit
the sale of the  securities  covered  thereby in  accordance  with the  intended
method or methods of disposition thereof, and pursuant thereto and in connection
with any  Registration  Statement  filed by the  Issuers  hereunder  the Issuers
shall:

            (a)  Prepare  and file with the SEC prior to the  applicable  Filing
      Date, a Registration Statement or Registration Statements as prescribed by
      Sections 2 or 3 hereof,  and use their  respective  best  efforts to cause
      each such Registration  Statement to become effective and remain effective
      as  provided  herein;  provided,  however,  that,  if (1) such  filing  is
      pursuant  to  Section  3  hereof,  or (2) a  Prospectus  contained  in the
      Exchange Offer  Registration  Statement filed pursuant to Section 2 hereof
      is required to be delivered under the Securities Act by any  Participating
      Broker-Dealer  who seeks to sell  Exchange  Notes  during  the  Applicable
      Period  relating  thereto,  before  filing any  Registration  Statement or
      Prospectus or any  amendments or  supplements  thereto,  the Issuers shall
      furnish to and afford the Holders of the Registrable Notes covered by such
      Registration  Statement or each such Participating  Broker-Dealer,  as the
      case may be,  their  counsel  and the  managing  underwriters,  if any,  a
      reasonable  opportunity to review copies of all such documents  (including
      copies of any documents to be  incorporated  by reference  therein and all
      exhibits  thereto)  proposed  to be filed (in each case at least five days
      prior to such  filing,  or such  later  date as is  reasonable  under  the
      circumstances).  The Issuers shall not file any Registration  Statement or
      Prospectus or any  amendments or  supplements  thereto if the Holders of a
      majority in aggregate principal amount of the Registrable Notes covered by
      such Registration Statement, or any such Participating  Broker-Dealer,  as
      the case may be,  their  counsel,  or the managing  underwriters,  if any,
      shall reasonably object.


                                     11
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<PAGE>





            (b) Prepare and file with the SEC such amendments and post-effective
      amendments  to  each  Shelf  Registration   Statement  or  Exchange  Offer
      Registration  Statement,  as the case may be, as may be  necessary to keep
      such Registration  Statement  continuously effective for the Effectiveness
      Period or the  Applicable  Period,  as the case may be;  cause the related
      Prospectus to be  supplemented  by any Prospectus  supplement  required by
      applicable  law, and as so  supplemented  to be filed pursuant to Rule 424
      (or any similar provisions then in force) promulgated under the Securities
      Act; and comply with the provisions of the Securities Act and the Exchange
      Act  applicable  to each of them with  respect to the  disposition  of all
      securities covered by such Registration Statement as so amended or in such
      Prospectus as so supplemented and with respect to the subsequent resale of
      any securities being sold by a Participating  Broker-Dealer covered by any
      such  Prospectus.  The  Issuers  shall be deemed  not to have  used  their
      respective  diligent  best  efforts  to  keep  a  Registration   Statement
      effective  during the Effective  Period or the Applicable  Period,  as the
      case may be, relating thereto if any of the Issuers  voluntarily takes any
      action  that would  result in selling  Holders  of the  Registrable  Notes
      covered thereby or Participating  Broker-Dealers  seeking to sell Exchange
      Notes not being able to sell such Registrable Notes or such Exchange Notes
      during that period unless (i) such action is required by applicable law or
      (ii) such  Issuers  comply  with the  provisions  of the last  sentence of
      Section 5(k) or the last paragraph of this Section 5.

            (c) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell Exchange Notes during the  Applicable  Period  relating  thereto from
      whom  the  Company  has  received   written  notice  that  it  will  be  a
      Participating  Broker-Dealer  in the  Exchange  Offer,  notify the selling
      Holders of Registrable Notes, or each such Participating Broker-Dealer, as
      the case may be,  their  counsel and the  managing  underwriters,  if any,
      promptly  (but in any event  within one day),  and confirm  such notice in
      writing,   (i)  when  a  Prospectus  or  any   Prospectus   supplement  or
      post-effective   amendment  has  been  filed,   and,  with  respect  to  a
      Registration Statement or any post-effective  amendment, when the same has
      become  effective  under the  Securities  Act  (including in such notice a
      written  statement that any Holder may, upon request,  obtain, at the sole
      expense of the Issuers, one conformed copy of such Registration  Statement
      or post-effective  amendment including financial statements and schedules,
      documents  incorporated  or deemed to be  incorporated  by  reference  and
      exhibits),  (ii) of the  issuance by the SEC of any stop order  suspending
      the  effectiveness of a Registration  Statement or of any order preventing
      or suspending the use of any  preliminary  prospectus or the initiation of
      any proceedings  for that purpose,  (iii) if at any time when a prospectus
      is required by the Securities Act to be delivered in connection with sales
      of the  Registrable  Notes or resales of Exchange  Notes by  Participating
      Broker-Dealers  the  representations  and warranties of any of the Issuers
      contained  in  any  agreement   (including  any  underwriting   agreement)
      contemplated  by Section  5(m) hereof  cease to be true and correct in all

                                     12
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<PAGE>





      material  respects,  (iv)  of the  receipt  by any of the  Issuers  of any
      notification  with  respect  to the  suspension  of the  qualification  or
      exemption from  qualification  of a  Registration  Statement or any of the
      Registrable  Notes or the Exchange  Notes to be sold by any  Participating
      Broker-Dealer for offer or sale in any jurisdiction,  or the initiation or
      threatening of any  proceeding  for such purpose,  (v) of the happening of
      any event,  the  existence of any  condition or any  information  becoming
      known that makes any  statement  made in such  Registration  Statement  or
      related   Prospectus  or  any  document   incorporated  or  deemed  to  be
      incorporated  therein by reference  untrue in any material respect or that
      requires the making of any changes in or amendments or supplements to such
      Registration  Statement,  Prospectus  or documents so that, in the case of
      the Registration  Statement, it will not contain any untrue statement of a
      material  fact or omit to state any  material  fact  required to be stated
      therein or necessary to make the statements  therein not  misleading,  and
      that in the  case  of the  Prospectus,  it will  not  contain  any  untrue
      statement of a material  fact or omit to state any material  fact required
      to be stated therein or necessary to make the statements therein, in light
      of the circumstances under which they were made, not misleading,  and (vi)
      of any of the Issuers' determination that a post-effective  amendment to a
      Registration Statement would be appropriate.

            (d) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell Exchange Notes during the  Applicable  Period,  use their  respective
      best  efforts  to  prevent  the  issuance  of  any  order  suspending  the
      effectiveness  of a Registration  Statement or of any order  preventing or
      suspending  the use of a Prospectus or suspending  the  qualification  (or
      exemption  from  qualification)  of any of the  Registrable  Notes  or the
      Exchange Notes to be sold by any Participating Broker-Dealer,  for sale in
      any  jurisdiction,  and,  if any  such  order  is  issued,  to  use  their
      respective  best efforts to obtain the withdrawal of any such order at the
      earliest possible date.

            (e) Subject to the  provisions of the last sentence of Section 5(k),
      if a Shelf Registration is filed pursuant to Section 3 and if requested by
      the  managing  underwriter  or  underwriters  (if any),  the  Holders of a
      majority in aggregate principal amount of the Registrable Notes being sold
      in  connection  with  an  underwritten   offering  or  any   Participating
      Broker-Dealer,  (i) promptly as  practicable  incorporate  in a prospectus
      supplement or  post-effective  amendment such  information as the managing
      underwriter or  underwriters  (if any),  such Holders,  any  Participating
      Broker-Dealer or counsel for any of them reasonably request to be included
      therein,  (ii) make all required filings of such prospectus  supplement or
      such  post-effective  amendment as soon as practicable after either Issuer
      has  received  notification  of the  matters  to be  incorporated  in such
      prospectus supplement or post-effective amendment, and (iii) supplement or
      make amendments to such Registration  Statement;  provided,  however, that
      the  Issuers  shall not be  required  to take any action  pursuant to this

                                     13
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      Section 5(e) that would violate applicable law.

            (f) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell Exchange Notes during the Applicable Period,  furnish to each selling
      Holder of Registrable Notes and to each such  Participating  Broker-Dealer
      who so requests and to counsel and each managing  underwriter,  if any, at
      the sole expense of the Issuers,  one conformed  copy of the  Registration
      Statement or  Registration  Statements and each  post-effective  amendment
      thereto,  including financial statements and schedules, and, if requested,
      all  documents  incorporated  or  deemed  to be  incorporated  therein  by
      reference and all exhibits.

            (g) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell Exchange Notes during the Applicable Period,  deliver to each selling
      Holder of Registrable Notes, or each such Participating Broker-Dealer,  as
      the case may be, their respective counsel,  and the underwriters,  if any,
      at the sole expense of the Issuers,  as many copies of the  Prospectus  or
      Prospectuses  (including  each form of  preliminary  prospectus)  and each
      amendment  or  supplement  thereto  and  any  documents   incorporated  by
      reference therein as such Persons may reasonably request;  and, subject to
      the last paragraph of this Section 5, each of the Issuers hereby  consents
      to the use of such Prospectus and each amendment or supplement  thereto by
      each  of  the  selling   Holders  of   Registrable   Notes  or  each  such
      Participating  Broker-Dealer,  as the case may be, and the underwriters or
      agents,  if any, and dealers (if any), in connection with the offering and
      sale of the  Registrable  Notes  covered by, or the sale by  Participating
      Broker-Dealers  of the Exchange Notes pursuant to, such Prospectus and any
      amendment or supplement thereto.

            (h)  Prior  to any  public  offering  of  Registrable  Notes  or any
      delivery of a  Prospectus  contained in the  Exchange  Offer  Registration
      Statement by any  Participating  Broker-Dealer  who seeks to sell Exchange
      Notes during the Applicable  Period,  to use their respective best efforts
      to register  or  qualify,  and to  cooperate  with the selling  Holders of
      Registrable Notes or each such  Participating  Broker-Dealer,  as the case
      may be,  the  managing  underwriter  or  underwriters,  if any,  and their
      respective  counsel in connection with the  registration or  qualification
      (or exemption from such registration or qualification) of such Registrable
      Notes  for offer and sale  under the  securities  or Blue Sky laws of such
      jurisdictions   within  the   United   States  as  any   selling   Holder,
      Participating  Broker-Dealer,  or the managing underwriter or underwriters
      reasonably  request in writing;  provided,  however,  that where  Exchange
      Notes  held by  Participating  Broker-Dealers  or  Registrable  Notes  are
      offered other than through an underwritten  offering, the Issuers agree to
      cause  their  counsel  to  perform  Blue  Sky   investigations   and  file


                                     14
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      registrations  and  qualifications  required to be filed  pursuant to this
      Section 5(h); keep each such  registration or qualification  (or exemption
      therefrom)  effective  during the period such  Registration  Statement  is
      required  to be kept  effective  and do any and all  other  acts or things
      reasonably  necessary  or  advisable  to enable  the  disposition  in such
      jurisdictions of the Exchange Notes held by  Participating  Broker-Dealers
      or the Registrable Notes covered by the applicable Registration Statement;
      provided,  however,  that none of the  Issuers  shall be  required  to (A)
      qualify generally to do business in any jurisdiction  where it is not then
      so qualified, (B) take any action that would subject it to general service
      of process in any such jurisdiction where it is not then so subject or (C)
      subject  itself to  taxation in excess of a nominal  dollar  amount in any
      such jurisdiction where it is not then so subject.

            (i) If a Shelf  Registration  is filed pursuant to Section 3 hereof,
      cooperate with the selling  Holders of Registrable  Notes and the managing
      underwriter or underwriters,  if any, to facilitate the timely preparation
      and delivery of certificates  representing  Registrable  Notes to be sold,
      which certificates shall not bear any restrictive  legends and shall be in
      a form eligible for deposit with The Depository Trust Company;  and enable
      such Registrable Notes to be in such  denominations and registered in such
      names as the managing underwriter or underwriters,  if any, or Holders may
      request.

            (j) Use their respective best efforts to cause the Registrable Notes
      covered by the Registration Statement to be registered with or approved by
      such other  governmental  agencies  or  authorities  as may be  reasonably
      necessary to enable the seller or sellers  thereof or the  underwriter  or
      underwriters,  if any, to consummate the  disposition of such  Registrable
      Notes,  except as may be required solely as a consequence of the nature of
      such selling Holder's  business,  in which case the Issuers will cooperate
      in all reasonable respects with the filing of such Registration  Statement
      and the granting of such approvals.

            (k) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell Exchange Notes during the Applicable  Period,  upon the occurrence of
      any event  contemplated  by  paragraph  5(c)(v)  or  5(c)(vi)  hereof,  as
      promptly as practicable  prepare and (subject to Section 5(a) hereof) file
      with  the  SEC,  at the sole  expense  of the  Issuers,  a  supplement  or
      post-effective  amendment to the Registration Statement or a supplement to
      the  related  Prospectus  or any  document  incorporated  or  deemed to be
      incorporated therein by reference,  or file any other required document so
      that, as thereafter  delivered to the purchasers of the Registrable  Notes
      being sold  thereunder or to the  purchasers of the Exchange Notes to whom
      such Prospectus will be delivered by a  Participating  Broker-Dealer,  any
      such Prospectus will not contain an untrue statement of a material fact or
      omit to state a material fact  required to be stated  therein or necessary

                                     15
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<PAGE>






      to make the statements  therein, in light of the circumstances under which
      they were made, not misleading. Notwithstanding the foregoing, the Issuers
      shall not be required to amend or supplement a Registration Statement, any
      related  prospectus or any document  incorporated  therein by reference in
      the event that, and for a period (a "Black Out Period") not to exceed, for
      so long as this Agreement is in effect,  an aggregate of 45 days if (x) an
      event  occurs  and is  continuing  as a  result  of  which a  Registration
      Statement,  any related prospectus or any document incorporated therein by
      reference  as then amended or  supplemented  would,  in the Issuers'  good
      faith judgment,  contain an untrue statement of a material fact or omit to
      state a material fact necessary in order to make the  statements  therein,
      in the  light  of the  circumstances  under  which  they  were  made,  not
      misleading,  and (y) (1) the  Issuers  determine  in good  faith  that the
      disclosure of such event at such time would have a material adverse effect
      on the  business,  operations  or  prospects  of the  Issuers  or (2)  the
      disclosure  otherwise relates to a material business transaction which has
      not yet been publicly disclosed in any relevant jurisdiction.

            (l) Prior to the effective date of the first Registration  Statement
      relating  to  the  Registrable   Notes,   (i)  provide  the  Trustee  with
      certificates for the Registrable Notes in a form eligible for deposit with
      The  Depository  Trust  Company  and (ii)  provide a CUSIP  number for the
      Registrable Notes.

            (m) In  connection  with any  underwritten  offering of  Registrable
      Notes  pursuant  to a  Shelf  Registration,  enter  into  an  underwriting
      agreement  as is customary in  underwritten  offerings of debt  securities
      similar to the Notes in form and substance reasonably  satisfactory to the
      Issuers and take all such other actions as are reasonably requested by the
      managing  underwriter or  underwriters  in order to expedite or facilitate
      the registration or the disposition of such Registrable Notes and, in such
      connection, (i) make such representations and warranties to, and covenants
      with,  the  underwriters  with  respect to the business of the Issuers and
      their respective subsidiaries (including any acquired business, properties
      or entity, if applicable) and the Registration  Statement,  Prospectus and
      documents,  if any, incorporated or deemed to be incorporated by reference
      therein,  in each case, as are customarily made by issuers to underwriters
      in  underwritten  offerings of debt securities  similar to the Notes,  and
      confirm the same in writing if and when  requested  in form and  substance
      reasonably  satisfactory to the Issuers;  (ii) obtain the written opinions
      of counsel to the Issuers and written updates  thereof in form,  scope and
      substance   reasonably   satisfactory  to  the  managing   underwriter  or
      underwriters,   addressed  to  the   underwriters   covering  the  matters
      customarily  covered in  opinions  reasonably  requested  in  underwritten
      offerings  and such other  matters as may be  reasonably  requested by the
      managing  underwriter  or  underwriters;  (iii) use their best  efforts to
      obtain  "cold  comfort"  letters  and updates  thereof in form,  scope and
      substance   reasonably   satisfactory  to  the  managing   underwriter  or
      underwriters  from the  independent  certified  public  accountants of the
      Issuers  (and,  if  necessary,  any  other  independent  certified  public
      accountants  of any  subsidiary  of any of the Issuers or of any  business

                                     16
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<PAGE>






      acquired  by  any  of the  Issuers  for  which  financial  statements  and
      financial  data are, or are required to be,  included or  incorporated  by
      reference  in  the  Registration  Statement),  addressed  to  each  of the
      underwriters, such letters to be in customary form and covering matters of
      the type customarily  covered in "cold comfort" letters in connection with
      underwritten  offerings of debt  securities  similar to the Notes and such
      other  matters as  reasonably  requested  by the managing  underwriter  or
      underwriters  as permitted by the Statement on Auditing  Standards No. 72;
      and (iv) if an  underwriting  agreement  is entered  into,  the same shall
      contain indemnification provisions and procedures no less favorable to the
      sellers and underwriters, if any, than those set forth in Section 7 hereof
      (or such  other  provisions  and  procedures  acceptable  to  Holders of a
      majority in aggregate  principal  amount of  Registrable  Notes covered by
      such Registration  Statement and the managing  underwriter or underwriters
      or agents,  if any).  The above shall be done at each  closing  under such
      underwriting agreement, or as and to the extent required thereunder.

            (n) If (1) a Shelf  Registration  is filed  pursuant  to  Section  3
      hereof, or (2) a Prospectus  contained in the Exchange Offer  Registration
      Statement  filed  pursuant to Section 2 hereof is required to be delivered
      under the Securities Act by any  Participating  Broker-Dealer who seeks to
      sell  Exchange  Notes during the  Applicable  Period,  make  available for
      inspection by any selling Holder of such Registrable  Notes being sold, or
      each such Participating Broker-Dealer, as the case may be, any underwriter
      participating  in any such  disposition of Registrable  Notes, if any, and
      any  attorney,  accountant  or other agent  retained  by any such  selling
      Holder or each such  Participating  Broker-Dealer,  as the case may be, or
      underwriter  (collectively,   the  "Inspectors"),  at  the  offices  where
      normally kept, during  reasonable  business hours, all financial and other
      records,  pertinent corporate documents and instruments of the Issuers and
      their respective  subsidiaries  (collectively,  the "Records") as shall be
      reasonably  necessary  to  enable  them to  exercise  any  applicable  due
      diligence  responsibilities,   and  cause  the  officers,   directors  and
      employees of the Issuers and their  respective  subsidiaries to supply all
      information  reasonably requested by any such Inspector in connection with
      such Registration Statement and Prospectus.  Each Inspector shall agree in
      writing  that it will keep the Records  confidential  and that it will not
      disclose any of the Records  unless (i) the  disclosure of such Records is
      necessary  to  avoid  or  correct  a  misstatement  or  omission  in  such
      Registration Statement or Prospectus,  (ii) the release of such Records is
      ordered  pursuant to a subpoena  or other order from a court of  competent
      jurisdiction,  (iii)  disclosure  of  such  information  is  necessary  or
      advisable, in the opinion of counsel for any Inspector, in connection with
      any action, claim, suit or proceeding,  directly or indirectly,  involving
      or  potentially  involving  such Inspector and arising out of, based upon,
      relating to, or involving this Agreement or the Purchase Agreement, or any
      transactions  contemplated  hereby or  thereby  or  arising  hereunder  or
      thereunder,  or  (iv)  the  information  in such  Records  has  been  made
      generally available to the public;  provided,  however,  that prior notice
      shall be provided as soon as  practicable  to the Issuers of the potential
      disclosure of any  information by such Inspector  pursuant to clauses (ii)
      or (iii) of this  sentence  to permit the  Issuers to obtain a  protective
      order  (or  waive  the  provisions  of this  paragraph  (n)) and that such
      Inspector  shall take such actions as are reasonably  necessary to protect
      the  confidentiality  of such  information (if  practicable) to the extent
      such action is otherwise  not  inconsistent  with,  an impairment of or in
      derogation  of the rights and  interests  of the Holder or any  Inspector.
      Each selling Holder of such Registrable Notes and each such  Participating
      Broker-Dealer will be required to agree that information obtained by it as
      a result of such inspections shall be deemed confidential and shall not be
      used by it as the basis for any market  transactions  in the securities of
      the  Issuers  unless and until  such is made  generally  available  to the
      public.  Each  selling  Holder  of such  Registrable  Notes  and each such
      Participating  Broker-Dealer  will be  required  to further  agree that it
      will,  upon learning that  disclosure of such Records is sought in a court
      of  competent  jurisdiction,  give  notice  to the  Issuers  and allow the
      Issuers  to  undertake  appropriate  action to prevent  disclosure  of the
      Records deemed confidential at the Issuers' expense.

            (o) Provide an indenture  trustee for the  Registrable  Notes or the
      Exchange  Notes,  as the case may be, and cause the Indenture or the trust
      indenture  provided for in Section 2(a) hereof,  as the case may be, to be
      qualified  under the TIA not later  than the  effective  date of the first
      Registration   Statement   relating  to  the  Registrable  Notes;  and  in
      connection therewith,  cooperate with the trustee under any such indenture
      and the Holders of the  Registrable  Notes, to effect such changes to such
      indenture  as may be required  for such  indenture  to be so  qualified in
      accordance  with  the  terms  of the  TIA;  and  execute,  and  use  their
      respective best efforts to cause such trustee to execute, all documents as
      may be required to effect such changes,  and all other forms and documents

                                     17
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<PAGE>






      required  to be  filed  with the SEC to  enable  such  indenture  to be so
      qualified in a timely manner.

            (p) Comply with all applicable  rules and regulations of the SEC and
      make  generally  available to their  respective  securityholders  earnings
      statements  satisfying  the  provisions of Section 11(a) of the Securities
      Act and Rule 158  thereunder  (or any similar rule  promulgated  under the
      Securities Act) no later than 45 days after the end of any 12-month period
      (or 90 days  after  the end of any  12-month  period  if such  period is a
      fiscal  year) (i)  commencing  at the end of any  fiscal  quarter in which
      Registrable  Notes are sold to  underwriters  in a firm commitment or best
      efforts underwritten offering and (ii) if not sold to underwriters in such
      an offering,  commencing  on the first day of the first fiscal  quarter of
      the Issuers after the effective  date of a Registration  Statement,  which
      statements shall cover said 12- month periods.

            (q) Upon  consummation of the Exchange Offer or a Private  Exchange,
      obtain an  opinion  of counsel to the  Issuers,  in a form  customary  for
      underwritten transactions, addressed to the Trustee for the benefit of all
      Holders of Registrable  Notes  participating  in the Exchange Offer or the
      Private  Exchange,  as the case may be, that the Exchange Notes or Private


                                     18
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      Exchange Notes, as the case may be, and the related  indenture  constitute
      legal, valid and binding  obligations of the Issuers,  enforceable against
      the Issuers in accordance with its respective terms,  subject to customary
      exceptions and qualifications.

            (r)  If  the  Exchange  Offer  or  a  Private   Exchange  is  to  be
      consummated,  upon  delivery  of the  Registrable  Notes by Holders to the
      Issuers (or to such other  Person as directed by the  Issuers) in exchange
      for the Exchange Notes or the Private  Exchange Notes, as the case may be,
      the Issuers shall mark, or cause to be marked,  on such Registrable  Notes
      that such  Registrable  Notes  are being  cancelled  in  exchange  for the
      Exchange Notes or the Private  Exchange  Notes,  as the case may be; in no
      event  shall  such  Registrable  Notes  be  marked  as paid  or  otherwise
      satisfied.

            (s) Cooperate with each seller of  Registrable  Notes covered by any
      Registration Statement and each underwriter,  if any, participating in the
      disposition  of such  Registrable  Notes and their  respective  counsel in
      connection  with  any  filings  required  to be  made  with  the  National
      Association of Securities Dealers, Inc. (the "NASD").

            (t) Use  their  respective  best  efforts  to take all  other  steps
      reasonably  necessary to effect the  registration  of the  Exchange  Notes
      and/or Registrable Notes covered by a Registration  Statement contemplated
      hereby.

            The Issuers may require each seller of Registrable Notes as to which
any  registration  is being effected to furnish to the Issuers such  information
regarding  such seller and the  distribution  of such  Registrable  Notes as the
Issuers may, from time to time, reasonably request. The Issuers may exclude from
such  registration  the  Registrable  Notes of any seller so long as such seller
fails to furnish such information  within a reasonable time after receiving such
request. Each seller as to which any Shelf Registration is being effected agrees
to furnish  promptly to the Issuers all information  required to be disclosed in
order to make the information previously furnished to the Issuers by such seller
not materially misleading.

            If any such  Registration  Statement refers to any Holder by name or
otherwise as the holder of any securities of the Issuers, then such Holder shall
have the right to require (i) the  insertion  therein of  language,  in form and
substance reasonably satisfactory to such Holder, to the effect that the holding
by such Holder of such securities is not to be construed as a recommendation  by
such Holder of the investment quality of the securities covered thereby and that
such  holding  does not imply that such Holder will assist in meeting any future
financial  requirements  of any of the  Issuers,  or (ii) in the event that such
reference to such Holder by name or otherwise is not required by the  Securities
Act or any similar federal statute then in force,  the deletion of the reference
to such Holder in any  amendment or  supplement  to the  Registration  Statement
filed or  prepared  subsequent  to the time  that  such  reference  ceases to be
required.

                                     19
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            Each   Holder   of   Registrable   Notes   and  each   Participating
Broker-Dealer  agrees by its acquisition of such  Registrable  Notes or Exchange
Notes to be sold by such Participating Broker-Dealer,  as the case may be, that,
upon actual receipt of any notice from the Issuers of the happening of any event
of the kind  described  in Section  5(c)(ii),  5(c)(iv),  5(c)(v),  or  5(c)(vi)
hereof, such Holder will forthwith  discontinue  disposition of such Registrable
Notes covered by such Registration  Statement or Prospectus or Exchange Notes to
be sold by such Holder or Participating Broker-Dealer, as the case may be, until
such  Holder's  or  Participating  Broker-Dealer's  receipt of the copies of the
supplemented or amended Prospectus contemplated by Section 5(k) hereof, or until
it is advised in writing  (the  "Advice")  by any of the Issuers that the use of
the  applicable  Prospectus  may be  resumed,  and has  received  copies  of any
amendments or supplements  thereto. In the event that the Issuers shall give any
such notice, each of the Effectiveness Period and the Applicable Period shall be
extended by the number of days during such periods from and  including  the date
of the  giving of such  notice  to and  including  the date when each  seller of
Registrable Notes covered by such Registration Statement or Exchange Notes to be
sold by such  Participating  Broker-Dealer,  as the  case  may  be,  shall  have
received (x) the copies of the supplemented or amended  Prospectus  contemplated
by Section 5(k) hereof or (y) the Advice.

6.    Registration Expenses

            All fees and expenses  incident to the  performance of or compliance
with this  Agreement by the Issuers  shall be borne by the Issuers,  jointly and
severally, whether or not the Exchange Offer Registration Statement or any Shelf
Registration is filed or becomes effective or the Exchange Offer is consummated,
including,  without limitation, (i) all registration and filing fees (including,
without  limitation,  (A) fees with respect to filings  required to be made with
the NASD in connection with an  underwritten  offering and (B) fees and expenses
of  compliance  with  state  securities  or Blue  Sky laws  (including,  without
limitation, reasonable fees and disbursements of counsel in connection with Blue
Sky  qualifications of the Registrable Notes or Exchange Notes and determination
of the  eligibility  of the  Registrable  Notes or Exchange Notes for investment
under the laws of such  jurisdictions (x) where the holders of Registrable Notes
are located,  in the case of the Exchange  Notes,  or (y) as provided in Section
5(h) hereof,  in the case of Registrable Notes or Exchange Notes to be sold by a
Participating  Broker-Dealer  during  the  Applicable  Period)),  (ii)  printing
expenses,  including, without limitation,  expenses of printing certificates for
Registrable  Notes or Exchange  Notes in a form  eligible  for deposit  with The
Depository  Trust  Company  and of  printing  prospectuses  if the  printing  of
prospectuses is requested by the managing  underwriter or underwriters,  if any,
by the Holders of a majority in aggregate  principal  amount of the  Registrable
Notes included in any Registration  Statement or in respect of Registrable Notes
or  Exchange  Notes to be sold by any  Participating  Broker-Dealer  during  the
Applicable  Period, as the case may be, (iii) messenger,  telephone and delivery
expenses,  (iv) fees and disbursements of counsel for the Issuers and reasonable
fees  and  disbursements  of one  special  counsel  for  all of the  sellers  of
Registrable  Notes  (exclusive  of any  counsel  retained  pursuant to Section 7
hereof),  (v)  fees  and  disbursements  of  all  independent  certified  public
accountants  referred  to  in  Section  5(m)(iii)  hereof  (including,   without

                                     20
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<PAGE>





limitation,  the  expenses  of any  special  audit  and "cold  comfort"  letters
required by or incident to such  performance),  (vi)  Securities  Act  liability
insurance,  if the Issuers desire such insurance,  (vi) fees and expenses of all
other Persons  retained by any of the Issuers,  (viii) internal  expenses of the
Issuers (including,  without  limitation,  all salaries and expenses of officers
and employees of all of the Issuers performing legal or accounting duties), (ix)
the  expense  of any  annual  audit,  (x) the  fees  and  expenses  incurred  in
connection with the listing of the securities to be registered on any securities
exchange,  and the  obtaining of a rating of the  securities,  in each case,  if
applicable,  and (xi) the expenses  relating to printing,  word  processing  and
distributing all Registration Statements,  underwriting  agreements,  indentures
and any other documents necessary in order to comply with this Agreement.

7.    Indemnification

            (a) The Issuers and any  Subsidiary  Guarantors  agree,  jointly and
severally,  to indemnify and hold harmless each Holder of Registrable  Notes and
each  Participating  Broker-Dealer  selling Exchange Notes during the Applicable
Period, the officers,  directors,  employees and agents of each such Person, and
each Person,  if any, who controls any such Person  within the meaning of either
Section 15 of the  Securities  Act or Section 20 of the  Exchange  Act (each,  a
"Participant"), from and against any and all losses, claims, damages, judgments,
liabilities and expenses  (including,  without limitation,  the reasonable legal
fees and other expenses actually incurred in connection with any suit, action or
proceeding or any claim  asserted)  caused by,  arising out of or based upon any
untrue statement or alleged untrue statement of a material fact contained in any
Registration  Statement (or any amendment  thereto) or Prospectus (as amended or
supplemented  if any of the  Issuers  shall have  furnished  any  amendments  or
supplements thereto) or any preliminary prospectus, or caused by, arising out of
or based upon any omission or alleged  omission to state therein a material fact
required to be stated  therein or necessary to make the statements  therein,  in
the case of the Prospectus in light of the  circumstances  under which they were
made,  not  misleading,  except  insofar  as such  losses,  claims,  damages  or
liabilities  are caused by any untrue  statement  or omission or alleged  untrue
statement or omission made in reliance upon and in conformity  with  information
relating  to any  Participant  furnished  to the  Issuers  in  writing  by  such
Participant expressly for use therein; provided,  however, that the Company will
not be liable if such untrue  statement or omission or alleged untrue  statement
or omission was contained or made in any preliminary prospectus and corrected in
the final  Prospectus or any amendment or supplement  thereto and any such loss,
liability,  claim, or damage or expense suffered or incurred by the Participants
resulted from any action, claim or suit by any Person who purchased  Registrable
Notes or Exchange Notes which are the subject thereof from such  Participant and
it is  established in the related  proceeding  that such  Participant  failed to
deliver or provide a copy of the final  Prospectus (as amended or  supplemented)
to such Person with or prior to the confirmation of the sale of such Registrable
Notes or Exchange Notes sold to such Person if required by applicable law.

            (b) Each Participant agrees, severally and not jointly, to indemnify

                                     21
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<PAGE>





and  hold  harmless  each of the  Issuers,  their  respective  directors,  their
respective  officers  who sign the  Registration  Statement  and each Person who
controls each Issuer within the meaning of Section 15 of the  Securities  Act or
Section 20 of the  Exchange  Act to the same extent  (but on a several,  and not
joint,  basis) as the foregoing  indemnity from the Issuers to each Participant,
but only with reference to information relating to such Participant furnished to
the Issuers in writing by such Participant expressly for use in any Registration
Statement or Prospectus, any amendment or supplement thereto, or any preliminary
prospectus.  The liability of any  Participant  under this paragraph shall in no
event exceed the proceeds received by such Participant from sales of Registrable
Notes or Exchange Notes giving rise to such obligations.

            (c) If any suit, action,  proceeding  (including any governmental or
regulatory investigation),  claim or demand shall be brought or asserted against
any Person in respect of which indemnity may be sought pursuant to either of the
two preceding paragraphs,  such Person (the "Indemnified Person") shall promptly
notify the Persons against whom such indemnity may be sought (the  "Indemnifying
Persons")  in  writing,  and  the  Indemnifying  Persons,  upon  request  of the
Indemnified  Person,  shall  retain  counsel  reasonably   satisfactory  to  the
Indemnified  Person to  represent  the  Indemnified  Person  and any  others the
Indemnifying  Persons may reasonably  designate in such proceeding and shall pay
the  fees  and  expenses  actually  incurred  by such  counsel  related  to such
proceeding;  provided,  however,  that the failure to so notify the Indemnifying
Persons shall not relieve any of them of any  obligation or liability  which any
of them may have hereunder or otherwise. In any such proceeding, any Indemnified
Person shall have the right to retain its own counsel, but the fees and expenses
of such counsel  shall be at the expense of such  Indemnified  Person unless (i)
the Indemnifying  Persons and the Indemnified  Person shall have mutually agreed
to the  contrary,  (ii) the  Indemnifying  Persons  shall have  failed  within a
reasonable  period  of time to retain  counsel  reasonably  satisfactory  to the
Indemnified Person or (iii) the named parties in any such proceeding  (including
any impleaded parties) include both any Indemnifying  Person and the Indemnified
Person or any affiliate  thereof and  representation of both parties by the same
counsel would be inappropriate  due to actual or potential  differing  interests
between  them.  It is  understood  that,  unless there  exists a conflict  among
Indemnified Persons, the Indemnifying Persons shall not, in connection with such
proceeding or separate but substantially  similar related proceeding in the same
jurisdiction arising out of the same general allegations, be liable for the fees
and expenses of more than one separate  firm (in addition to any local  counsel)
for all  Indemnified  Persons,  and  that all such  fees and  expenses  shall be
reimbursed  promptly  as they  are  incurred.  Any  such  separate  firm for the
Participants  and such control  Persons of  Participants  shall be designated in
writing by Participants who sold a majority in interest of Registrable Notes and
Exchange Notes sold by all such Participants and shall be reasonably  acceptable
to the Issuers and any such  separate  firm for the  Issuers,  their  respective
directors,  their  respective  officers and such control  Persons of the Issuers
shall be designated in writing by the Issuers and shall be reasonably acceptable
to the Holders.

            The  Indemnifying  Persons shall not be liable for any settlement of
any proceeding  effected  without its prior written consent (which consent shall
not be unreasonably withheld or delayed), but if settled with such consent or if

                                     22
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<PAGE>





there  be a final  non-appealable  judgment  for the  plaintiff  for  which  the
Indemnified  Person is entitled to  indemnification  pursuant to this Agreement,
each of the  Indemnifying  Persons  agrees to indemnify  and hold  harmless each
Indemnified  Person  from and against  any loss or  liability  by reason of such
settlement or judgment.  No Indemnifying Person shall, without the prior written
consent of the  Indemnified  Persons  (which  consent shall not be  unreasonably
withheld or delayed),  effect any  settlement  or  compromise  of any pending or
threatened  proceeding  in respect of which any  Indemnified  Person is or could
have been a party,  or  indemnity  could  have  been  sought  hereunder  by such
Indemnified Person, unless such settlement (A) includes an unconditional written
release  of  such  Indemnified   Person,   in  form  and  substance   reasonably
satisfactory to such Indemnified  Person,  from all liability on claims that are
the subject matter of such  proceeding and (B) does not include any statement as
to an admission of fault,  culpability or failure to act by or on behalf of such
Indemnified Person.

            (d) If the  indemnification  provided  for in the first  and  second
paragraphs of this Section 7 is for any reason  unavailable  to, or insufficient
to hold  harmless,  an  Indemnified  Person in  respect of any  losses,  claims,
damages or liabilities referred to therein,  then each Indemnifying Person under
such paragraphs,  in lieu of indemnifying such Indemnified Person thereunder and
in order to provide for just and equitable contribution, shall contribute to the
amount paid or payable by such  Indemnified  Person as a result of such  losses,
claims,  damages or liabilities in such  proportion as is appropriate to reflect
(i) the relative benefits received by the Indemnifying  Person or Persons on the
one hand and the Indemnified Person or Persons on the other from the offering of
the Notes or (ii) if the allocation  provided by the foregoing clause (i) is not
permitted  by  applicable  law,  not only such  relative  benefits  but also the
relative  fault of the  Indemnifying  Person or  Persons on the one hand and the
Indemnified  Person or Persons on the other in connection with the statements or
omissions  or alleged  statements  or  omissions  that  resulted in such losses,
claims,  damages or liabilities  (or actions in respect  thereof) as well as any
other relevant equitable  considerations.  The relative benefits received by the
Issuers on the one hand and the  Participants on the other shall be deemed to be
in the same proportion as the total proceeds from the offering (net of discounts
and  commissions  but before  deducting  expenses) of the Notes  received by the
Issuers bears to the total proceeds  received by such  Participant from the sale
of Registrable  Notes or Exchange Notes, as the case may be, in each case as set
forth in the table on the cover page of the  Offering  Memorandum  in respect of
the sale of the Notes.  The relative fault of the parties shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged  omission to state a material fact
relates  to  information  supplied  by the  Issuers  on the  one  hand  or  such
Participant or such other Indemnified  Person, as the case may be, on the other,
the parties' relative intent,  knowledge,  access to information and opportunity
to  correct or prevent  such  statement  or  omission,  and any other  equitable
considerations appropriate in the circumstances.

            (e) The  parties  agree that it would not be just and  equitable  if
contribution  pursuant to this Section 7 were  determined by pro rata allocation
(even if the Participants were treated as one entity for such purpose) or by any


                                     23
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<PAGE>





other  method  of  allocation  that  does  not  take  account  of the  equitable
considerations  referred to in the immediately  preceding paragraph.  The amount
paid or  payable by an  Indemnified  Person as a result of the  losses,  claims,
damages,  judgments,  liabilities  and expenses  referred to in the  immediately
preceding  paragraph shall be deemed to include,  subject to the limitations set
forth above,  any reasonable legal or other expenses  actually  incurred by such
Indemnified Person in connection with investigating or defending any such action
or claim.  Notwithstanding the provisions of this Section 7, in no event shall a
Participant  be  required  to  contribute  any amount in excess of the amount by
which proceeds  received by such Participant from sales of Registrable  Notes or
Exchange  Notes, as the case may be, exceeds the amount of any damages that such
Participant  has  otherwise  been  required to pay or has paid by reason of such
untrue or alleged untrue  statement or omission or alleged  omission.  No Person
guilty of fraudulent  misrepresentation  (within the meaning of Section 11(f) of
the Securities  Act) shall be entitled to  contribution  from any Person who was
not guilty of such fraudulent misrepresentation.

            (f) Any losses, claims,  damages,  liabilities or expenses for which
an indemnified party is entitled to  indemnification  or contribution under this
Section 7 shall be paid by the  Indemnifying  Party to the Indemnified  Party as
such  losses,  claims,  damages,  liabilities  or  expenses  are  incurred.  The
indemnity  and  contribution  agreements  contained  in this  Section  7 and the
representations  and warranties of the Issuers set forth in this Agreement shall
remain  operative  and  in  full  force  and  effect,   regardless  of  (i)  any
investigation  made by or on behalf of any Holder or any  person who  controls a
Holder, any Issuer, their respective directors, officers, employees or agents or
any person controlling any Issuer, and (ii) any termination of this Agreement.

            (g) The  indemnity  and  contribution  agreements  contained in this
Section 7 will be in addition to any liability  which the  Indemnifying  Persons
may otherwise have to the Indemnified Persons referred to above.

8.    Rules 144 and 144A

            The  Issuers  covenant  and  agree  that  each of them will file the
reports  required to be filed by each of them under the  Securities  Act and the
Exchange Act and the rules and  regulations  adopted by the SEC  thereunder in a
timely manner in accordance with the  requirements of the Securities Act and the
Exchange Act and, if at any time any of the Issuers is not required to file such
reports, such Issuer will, upon the request of any Holder or beneficial owner of
Registrable  Notes,  make available such  information  necessary to permit sales
pursuant to Rule 144A under the Securities Act. The Issuers further covenant and
agree, for so long as any Registrable Notes remain outstanding that each of them
will take such further action as any Holder of Registrable  Notes may reasonably
request,  all to the extent  required from time to time to enable such holder to
sell Registrable Notes without  registration under the Securities Act within the
limitation of the exemptions provided by (a) Rule 144(k) and Rule 144A under the
Securities  Act,  as such  Rules may be  amended  from time to time,  or (b) any
similar rule or regulation hereafter adopted by the SEC.

                                     24
145391.01


<PAGE>







                                     25
145391.01


<PAGE>






9.    Underwritten Registrations

            If any of the  Registrable  Notes covered by any Shelf  Registration
are to be sold in an underwritten  offering, the investment banker or investment
bankers and manager or managers  that will manage the offering  will be selected
by the Holders of a majority in aggregate  principal  amount of such Registrable
Notes  included  in such  offering  and shall be  reasonably  acceptable  to the
Issuers.

            No Holder of Registrable  Notes may participate in any  underwritten
registration  hereunder  unless  such  Holder (a)  agrees to sell such  Holder's
Registrable  Notes  on  the  basis  provided  in any  underwriting  arrangements
approved by the Persons entitled  hereunder to approve such arrangements and (b)
completes  and executes  all  questionnaires,  powers of attorney,  indemnities,
underwriting  agreements  and other  documents  required under the terms of such
underwriting arrangements.

10.   Miscellaneous

            (a) No Inconsistent  Agreements.  None of the Issuers has, as of the
date hereof,  and none of the Issuers shall,  after the date of this  Agreement,
enter  into  any  agreement  with  respect  to  any of its  securities  that  is
inconsistent with the rights granted to the Holders of Registrable Notes in this
Agreement or otherwise  conflicts with the provisions hereof. The rights granted
to  the  Holders  hereunder  do not  in  any  way  conflict  with  and  are  not
inconsistent with the rights granted to the holders of any of the Issuers' other
issued and outstanding securities under any such agreements. Except as otherwise
disclosed  to the Initial  Purchasers,  none of the Issuers has entered and none
will enter into any agreement with respect to any of its  securities  which will
grant  to  any  Person  piggy-back  registration  rights  with  respect  to  any
Registration Statement.

            (b) Adjustments  Affecting  Registrable  Notes.  None of the Issuers
shall,  directly or indirectly,  take any action with respect to the Registrable
Notes as a class  that would  adversely  affect  the  ability of the  Holders of
Registrable Notes to include such Registrable Notes in a registration undertaken
pursuant to this Agreement.

            (c) Amendments and Waivers. The provisions of this Agreement may not
be amended, modified or supplemented, and waivers or consents to departures from
the  provisions  hereof may not be given,  otherwise than with the prior written
consent of (I) the Issuers and the  Subsidiary  Guarantors,  if any, and (II)(A)
the Holders of not less than a majority  in  aggregate  principal  amount of the
then outstanding Registrable Notes and (B) in circumstances that would adversely
affect  the  Participating  Broker-Dealers,   the  Participating  Broker-Dealers
holding not less than a majority in aggregate  principal  amount of the Exchange
Notes held by all Participating Broker-Dealers;  provided, however, that Section
7 and this Section 10(c) may not be amended,  modified or  supplemented  without
the prior written  consent of each Holder and each  Participating  Broker-Dealer
(including  any  person  who was a  Holder  or  Participating  Broker-Dealer  of
Registrable Notes or Exchange Notes, as the case may be, disposed of pursuant to

                                     26
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<PAGE>





any  Registration  Statement)  affected by any such  amendment,  modification or
supplement.  Notwithstanding  the foregoing,  a waiver or consent to depart from
the provisions  hereof with respect to a matter that relates  exclusively to the
rights of Holders of Registrable  Notes whose securities are being sold pursuant
to a  Registration  Statement and that does not directly or  indirectly  affect,
impair, limit or compromise the rights of other Holders of Registrable Notes may
be given by Holders of at least a majority in aggregate  principal amount of the
Registrable Notes being sold pursuant to such Registration Statement.

            (d)  Notices.  All  notices  and  other  communications  (including,
without limitation, any notices or other communications to the Trustee) provided
for or permitted hereunder shall be made in writing by hand-delivery, registered
first-class mail, next-day air courier or facsimile:

             (i) if to a Holder of the  Registrable  Notes or any  Participating
      Broker-Dealer, at the most current address of such Holder or Participating
      Broker-Dealer,  as the  case  may be,  set  forth  on the  records  of the
      registrar under the Indenture.

            (ii)  if  to  either  of  the  Issuers  or  any  of  the  Subsidiary
      Guarantors, at the address as follows:

                  c/o Abraxas Petroleum Corporation
                  500 N. Loop 1604 East
                  Suite 100
                  San Antonio, Texas
                  Facsimile No.:  (210) 490-8816
                  Attention:  Chief Executive Officer

            All such  notices  and  communications  shall be deemed to have been
duly given: when delivered by hand, if personally delivered;  five business days
after being deposited in the mail, postage prepaid,  if mailed; one business day
after being timely  delivered  to a next-day  air  courier;  and when receipt is
acknowledged by the addressee, if sent by facsimile.

            Copies of all such notices, demands or other communications shall be
concurrently  delivered  by the  Person  giving  the same to the  Trustee at the
address and in the manner specified in such Indenture.

            (e)  Successors  and  Assigns.  This  Agreement  shall  inure to the
benefit of and be binding upon the successors and assigns of each of the parties
hereto, the Holders and the Participating Broker-Dealers.

            (f) Release of Subsidiary  Guarantors.  If any Subsidiary  Guarantor
becomes  a  party  to this  Agreement  and is  subsequently  released  from  its
obligations  under the Indenture in accordance  with the terms thereof then such

                                    27
145391.01


<PAGE>





Subsidiary Guarantor shall be released from its obligations hereunder.

            (g)  Counterparts.  This  Agreement may be executed in any number of
counterparts and by the parties hereto in separate  counterparts,  each of which
when so  executed  shall be  deemed  to be an  original  and all of which  taken
together shall constitute one and the same agreement.

            (h) Headings.  The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

            (i) Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK,  AS APPLIED TO CONTRACTS
MADE AND  PERFORMED  ENTIRELY  WITHIN THE STATE OF NEW YORK,  WITHOUT  REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.

            (j) Severability. If any term, provision, covenant or restriction of
this  Agreement  is held by a court of  competent  jurisdiction  to be  invalid,
illegal,  void  or  unenforceable,  the  remainder  of  the  terms,  provisions,
covenants  and  restrictions  set forth  herein  shall  remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their best efforts to find and employ an  alternative  means to
achieve the same or substantially  the same result as that  contemplated by such
term, provision,  covenant or restriction.  It is hereby stipulated and declared
to be the  intention of the parties that they would have  executed the remaining
terms, provisions, covenants and restrictions without including any of such that
may be hereafter declared invalid, illegal, void or unenforceable.

            (k) Securities Held by the Issuers or Their Affiliates. Whenever the
consent or approval of Holders of a specified percentage of Registrable Notes is
required hereunder, Registrable Notes held by any of the Issuers or any of their
their  respective  affiliates  (as such  term is  defined  in Rule 405 under the
Securities  Act) shall not be counted in  determining  whether  such  consent or
approval was given by the Holders of such required percentage.

            (l) Third  Party  Beneficiaries.  Holders of  Registrable  Notes and
Participating  Broker-Dealers  are intended  third party  beneficiaries  of this
Agreement, and this Agreement may be enforced by such Persons.

            (m) Entire  Agreement.  This  Agreement,  together with the Purchase
Agreement and the Indenture, is intended by the parties as a final and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject  matter  contained  herein and therein and any and all prior oral or
written agreements,  representations, or warranties, contracts,  understandings,
correspondence,  conversations and memoranda between the Holders on the one hand
and the Issuers on the other,  or between or among any agents,  representatives,


                                     28
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<PAGE>





parents,  subsidiaries,  affiliates,  predecessors  in interest or successors in
interest with respect to the subject matter hereof and thereof are merged herein
and replaced hereby.

            (n)  Information  Supplied by the  Participants.  The statements set
forth in the last  paragraph on the front cover page and under the heading "Plan
of Distribution" in the preliminary  offering  memorandum and the final offering
memorandum  in respect of the sale of the Notes (to the extent  such  statements
relate  to a  Participant)  constitute  the only  information  furnished  by the
Participants to the Issuers for the purposes of Section 7 hereof.


                                     29
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<PAGE>





            (o) Subsidiary  Guarantor a Party.  Immediately upon the designation
of any Subsidiary of either Issuer as a Restricted Subsidiary (as defined in the
Indenture),  the Issuers shall cause such Subsidiary to become a party hereto as
a Subsidiary  Guarantor by executing and delivering to the Initial  Purchasers a
counterpart hereof.

            IN WITNESS  WHEREOF,  the parties have executed this Agreement as of
the date first written above.



ABRAXAS PETROLEUM CORPORATION             BT SECURITIES CORPORATION,
                                            as Initial Purchaser


By:                                       By:

Name:                                     Name:
Title:                                    Title:


CANADIAN ABRAXAS PETROLEUM                BANKERS TRUST INTERNATIONAL
   LIMITED                                PLC,
                                             as Initial Purchaser


By:                                       By:

Name:                                     Name:
Title:                                    Title:


                                          JEFFERIES & COMPANY, INC.,
                                            as Initial Purchaser


                                          By:

                                          Name:
                                          Title:


                                         

                                     30
145391.01


<PAGE>

                                          ING BARING (U.S.) SECURITIES
                                          CORPORATION,
                                             as Initial Purchaser




                                          By:
  
                                          Name:
                                          Title:








                                     31
145391.01


<PAGE>




            Each of the  undersigned by its execution  hereof agrees to become a
party to this  Agreement  as a  Subsidiary  Guarantor as of the date first above
written:


                                    By:
                                          Name:
                                          Title:

                                     32
145391.01


<PAGE>



                              SHARE SALE AGREEMENT
                                  IN RESPECT OF
                    CGGS CANADIAN GAS GATHERING SYSTEMS INC.


                                    BETWEEN:


                               THE SHAREHOLDERS OF
                    CGGS CANADIAN GAS GATHERING SYSTEMS INC.

                                     - and -

                   CGGS CANADIAN GAS GATHERING SYSTEMS INC.

                                     - and -

                          ABRAXAS PETROLEUM CORPORATION

                                     - and -

                       CANADIAN ABRAXAS PETROLEUM LIMITED




                  DATED AS OF THE 29TH DAY OF OCTOBER, 1996





                             BENNETT JONES VERCHERE
                             4500 Bankers Hall East
                              855 - 2nd Street S.W.
                                Calgary, Alberta
                                     T2P 4K7



<PAGE>








TABLE OF CONTENTS

PAGE

ARTICLE 1 DEFINITIONS AND PRINCIPLES OF INTERPRETATION

1.1   Definitions                                                  1
1.2   Certain Rules of Interpretation                             13
1.3   Entire Agreement                                            14
1.4   Applicable Law and Jurisdiction                             14
1.5   Accounting Terms                                            14
1.6   Knowledge                                                   15
1.7   Liabilities                                                 15
1.8   Joint Rights                                                15
1.9   Schedules                                                   16

ARTICLE 2 PURCHASE AND SALE

2.1   Action by Vendors and Purchaser                             17
2.2   Adjustments to Purchase Price                               18
2.3   Closing and Post-Closing Adjustments                        19
2.4   Place and Time of Closing                                   20
2.5   Tender                                                      20
2.6   Section 116 Certificate                                     20
2.7   Deposit                                                     20
2.8   Limitation                                                  21
2.9   Representations and Warranties;
       Material Adverse Damage                                    21
2.10  [Intentionally Deleted]                                     22

ARTICLE 3 REPRESENTATIONS AND WARRANTIES OF THE VENDORS AND THE
COMPANY

3.1   Incorporation and Registration                              22
3.2   Subsidiaries                                                22
3.3   Capital                                                     22
3.4   Absence of Conflicting Agreements                           23
3.5   Financial Statements                                        23
3.6   Absence of Unusual Transactions                             24
3.7   Absence of Guarantees                                       25
3.8   Restrictive Covenants                                       25
3.9   Tax Matters                                                 25
3.10  Equipment Contracts                                         27
3.11  Real Property and Real Property Leases                      27
3.12  Title to Assets                                             27
3.13  Quiet Enjoyment                                             27
3.14  Material Contracts                                          28
3.15  Litigation                                                  28
3.16  Compliance with Terms                                       28
3.17  Title Documents and Production Sales Contracts              28
3.18  Production and Accounts Receivable                          29
3.19  Employment Matters                                          29
3.20  Employees                                                   29


<PAGE>



3.21  Insurance                                                   29
3.22  Copies of Agreements etc.                                   30
3.23  Bank Accounts, etc.                                         30
3.24  Corporate Records and Minute Books                          30
3.25  Environmental Matters                                       30
3.26  No Production Penalties                                     31
3.27  No Excess Gas Deliveries                                    32
3.28  Prepaid Gas Obligations                                     32
3.29  Royalty Payments                                            32
3.30  Gas Balancing Agreements                                    32
3.31  Production Sale Contracts                                   32
3.32  Partnerships                                                32
3.33  Capacity                                                    32
3.34  Capital Expenditures                                        33
3.35  Engineering Report                                          33
3.36  [Intentionally Omitted]                                     33
3.37  No Business in the United States                            33
3.38  Due Authorization                                           33
3.39  Enforceability of Obligations                               33
3.40  Consents, Approvals or Authorizations                       34
3.41  Finders' Fees                                               34
3.42  Formation of the Vendors;
            Title to the Purchased Shares                         34
3.43  Due Authorization                                           35
3.44  Enforceability of Obligations                               35
3.45  Consents, Approvals or Authorizations                       35
3.46  Finders' Fees                                               35

ARTICLE 4 REPRESENTATIONS AND WARRANTIES OF ABRAXAS AND THE
PURCHASER

4.1   Incorporation                                               37
4.2   Due Authorization                                           37
4.3   Enforceability of Obligations                               37
4.4   Absence of Conflicting Agreements                           37
4.5   Consents, Approvals or Authorizations                       38
4.6   Finders' Fees                                               38
4.7   Independent Evaluation                                      38
4.8   Eligibility                                                 38
4.9   Securities Laws                                             38

ARTICLE 5 SURVIVAL

5.1   Nature and Survival                                         39
5.2   Reliance                                                    39

ARTICLE 6 PURCHASER'S CONDITIONS PRECEDENT

6.1   Truth and Accuracy of Representations
          of Company at the Closing Time                          40
6.2   Performance of Obligations                                  40
6.3   Receipt of Closing Documentation                            40
6.4   Consents, Authorizations and Registrations                  40
6.5   [Intentionally Omitted]                                     41


<PAGE>



6.6   Agreements Terminated                                       41
6.7   Closing Opinion                                             41
6.8   Title Opinion Update                                        41
6.9   Financing                                                   41
6.10  Officers and Directors                                      41
6.11  Escrow Agreement                                            41
6.12  Sale of Excluded Assets                                     41
6.13  Termination Agreements and Transition Agreement             42
6.14  Material Adverse Damage                                     42
6.15  No Litigation                                               42
6.16  Bank Accounts                                               42
6.17  Debentures                                                  42

ARTICLE 7 VENDORS' CONDITIONS PRECEDENT

7.1   Truth and Accuracy of Representations
          of Purchaser at Closing Time                            43
7.2   Performance of Obligations                                  43
7.3   Receipt of Closing Documentation                            43
7.4   Consents, Authorizations and Registrations                  43
7.5   Closing Opinion                                             44
7.6   Release of Directors and Officers                           44
7.7   Escrow Agreement                                            44
7.8   Representations and Warranties                              44
7.9   No Litigation                                               44
7.10  Termination Agreements and Transition Agreement             44
7.11  Material Adverse Damage                                     44

ARTICLE 8 INTERIM PERIOD

8.1   Conduct of Business Prior to Closing                        45
8.2   Access for Investigation                                    48
8.3   Actions to Satisfy Closing Conditions                       49
8.4   Waiver of Conditions in Nevis Agreement                     49
8.5   Delivery of Debentures to the Representative                49

ARTICLE 9 POST-CLOSING MATTERS

9.1   Claims                                                      49
9.2   Escrow Account                                              51
9.3   Joint Venture Audits                                        52
9.4   Stub Period Returns                                         53
9.5   Change of Name                                              53
9.6   Tax and Royalty Matters                                     53
9.7   Repayment of Debentures                                     55

ARTICLE 10 CONFIDENTIALITY

10.1  Confidential Information                                    55
10.2  Obligation                                                  56
10.3  Disclosure                                                  56
10.4  Remedies                                                    56

ARTICLE 11 GENERAL


<PAGE>



11.1  Covenant of the Vendors                                     56
11.2  Public Notices                                              57
11.3  Expenses                                                    57
11.4  Notices                                                     57
11.5  Parties in Interest                                         60
11.6  Time                                                        60
11.7  Assignment, Successors and Assigns                          60
11.8  Further Assurances                                          60
11.9  Counterparts                                                60

ARTICLE 12 TERMINATION

12.1  Termination                                                 60
12.2  Effect of Termination                                       61

ARTICLE 13 ARBITRATION

13.1  Arbitration                                                 61
SHARE SALE AGREEMENT


THIS AGREEMENT is made as of the 29th day of October, 1996

BETWEEN:

THE SHAREHOLDERS OF CGGS CANADIAN GAS GATHERING SYSTEMS INC.
(hereinafter called the "Vendors")

- - and -

CGGS CANADIAN GAS GATHERING SYSTEMS INC., a corporation  incorporated  under the
laws of Canada (hereinafter called the "Company")

- - and -

ABRAXAS PETROLEUM CORPORATION,  a corporation incorporated under the laws of the
State of Nevada  (hereinafter  called  "Abraxas") and CANADIAN ABRAXAS PETROLEUM
LIMITED, a corporation incorporated under the laws of Canada (hereinafter called
the "Purchaser")


RECITALS:

A.    The Vendors beneficially own and control all of the
Purchased Shares and the Option.

B. The Vendors desire to sell, and the Purchaser desires to purchase, all of the
Purchased  Shares and the Parties  desire to terminate the Option,  all upon and
subject to the terms and conditions set forth in this Agreement.

      NOW THEREFORE, in consideration of premises and covenants


<PAGE>



herein set forth, the receipt and sufficiency of which is hereby acknowledged by
the Parties, the Parties agree as follows:


ARTICLE 1
DEFINITIONS AND PRINCIPLES OF INTERPRETATION

1.1   Definitions

Whenever used in this Agreement,  unless there is something  inconsistent in the
subject matter or context, the following words and terms shall have the meanings
set out below:

"Abraxas" means Abraxas Petroleum Corporation, a corporation
incorporated under the laws of the State of Nevada;

"Accounting Firm" shall have the meaning ascribed thereto in
Section 2.3(c);

      "Act" means the Income Tax Act (Canada) as amended;

"Adjustments" has the meaning ascribed thereto in Section 2.3(a);

"AEUB  Approval"  means an order of the Alberta Energy and Utilities  Board that
section 99 of the Public  Utilities  Board Act  (Alberta)  does not apply to the
transactions contemplated herein;

"Affiliate"  has the meaning given in the Business Corporations
Act (Alberta), as amended from time to time;

"Agreement"  means this Share Sale Agreement,  including all schedules,  and all
instruments   supplementing  or  amending  or  confirming  this  Agreement,  and
references to "Article" or "Section" are to the specified  Article or Section of
this Agreement;

"Alberta Crown Royalties" has the meaning ascribed thereto in
Section 5.1(b);

"Assets"  means all of the assets of the Company  including  the  Petroleum  and
Natural Gas Rights, the Miscellaneous  Interests and the Tangibles and all other
assets  described,  referred to, or included  expressly or by implication in the
July 31 Balance
Sheet, other than the Excluded Assets;

"Assessment" has the meaning ascribed thereto in Section 9.6(a);

      "Audit Notice" has the meaning ascribed thereto in Section
9.3(a);

"Audited Balance Sheet" has the meaning ascribed thereto in
Section 2.3(b);

      "Auditors" has the meaning ascribed thereto in Section

                                       
<PAGE>



2.3(b);

"BDP" means Burnet, Duckworth & Palmer, Barristers and
Solicitors, Calgary, Alberta, solicitors for the Purchaser;

"BJV" means Bennett Jones Verchere, Barristers and Solicitors,
Calgary, Alberta, the solicitors for the Vendors and the Company;

"Business Day" means a day, other than a Saturday,  Sunday or statutory holiday,
on which the principal commercial banks located in Calgary, Alberta are open for
business during normal banking hours;

"Claim Notice" has the meaning ascribed thereto in Section
9.1(a);

"Claims" means any claim, demand,  action, cause of action,  damage, loss, cost,
liability or expense,  including reasonable legal fees and all costs incurred in
investigating,  defending  or pursuing any of the  foregoing  or any  proceeding
relating to any of the foregoing;

"Class A Shares" means Class A shares (without nominal or par
value) in the capital of the Company;

"Class B Shares" means Class B shares (without nominal or par
value) in the capital of the Company;

"Closing" means the completion of the sale and purchase of the
Purchased Shares under and as contemplated in this Agreement;

"Closing  Date"  means the date on which  Closing  is to occur (as  provided  in
Section  2.4) which  shall be the  Business  Day on which all of the  conditions
precedent  set  forth in  Articles  6 and 7 have  been  satisfied  or  waived in
writing,  provided  however that in no event will Closing occur earlier than the
second Business Day after the Business Day on which the Section 116 Certificates
are received, or such other date as the Parties may agree as the date upon which
the Closing shall take place;

"Closing Purchase Price" has the meaning ascribed thereto in
Section 2.1;

"Closing Statement" has the meaning ascribed thereto in Section
2.3(a);

"Closing Time" means 10:00 o'clock a.m., local time at the Place of Closing,  on
the Closing Date or at such other time as the Parties may agree;

"Company" means CGGS Canadian Gas Gathering Systems Inc., a
corporation incorporated under the laws of Canada;

      "Contractual Claim" has the meaning ascribed thereto in

                                       
<PAGE>



Section 9.1(a);

"Corporate Tax Act" has the meaning ascribed thereto in Section
3.9(h);

"Curtis Mallet" means Curtis, Mallet-Provost, Colt & Mosle,
Attorneys and Counsellors at Law, New York, New York, attorneys
for the Vendors;

"Damages" has the meaning ascribed thereto in Section 9.1(a);

"Debenture Prepayment Agreement" means an agreement between the
Company and the holders of the Old Debentures in the form of
Schedule 6.17;

"Debentures"  means  all of the  debentures  to be issued  on the  Business  Day
immediately prior to Closing in payment for the Old Debentures, for an aggregate
principal amount in Canadian dollars equal to the Canadian dollar  equivalent of
the  aggregate  principal  amount of the Old  Debentures  set forth in  Schedule
1.1(c)  plus  interest  accrued  but  unpaid  thereon,   which  Canadian  dollar
equivalent shall be calculated based upon the noon rate of exchange for Canadian
interbank  transactions  established  by the Bank of Canada for the Business Day
immediately  prior  to the  Closing  Date  (or if such  rate  is for any  reason
unavailable, at the spot rate quoted for wholesale transactions by the Company's
bank at  approximately  noon (Toronto time) on that date in accordance  with its
normal  practice),  and which debentures shall otherwise be in substantially the
form attached as Exhibit "A" to the Debenture Prepayment Agreement;

"Deposit" has the meaning ascribed thereto in Section 2.7(a);

"Encumbrance"  means a Royalty,  pledge,  lien,  restriction,  charge,  security
agreement,  lease, title retention  agreement,  mortgage,  encumbrance,  charge,
option,  imperfection  of title or other adverse claim, of any kind or character
whatsoever;

"Engineering Report" means the "Evaluation of the P. & N.G.
Reserves of CGGS Canadian Gas Gathering Systems Inc. (as of
September 1, 1996)" prepared by Sproule Associates Limited;

"Environment" means the components of the earth and includes:

(a)   air, land, water, groundwater, soil and subsurface soil;

(b)   all layers of the atmosphere;

(c)   all organic and inorganic matter and living organisms;

(d)   the environment in the workplace; and

(e) the  interacting  natural  systems  that include  components  referred to in
subparagraphsa(a), (b), (c) and (d) above.

                                      
<PAGE>



"Environmental  Approvals"  means  applicable  permits,  licences and  approvals
required by Governmental  Authorities  pursuant to the  Environmental  Laws with
respect to the use of a property or operation of a business;

"Environmental  Laws"  means all  applicable  Canadian,  Alberta and local laws,
by-laws, rules,  regulations,  orders,  information letters, interim directives,
general  bulletins and guidelines  (collectively,  in this  definition,  "laws")
relating to the protection of the environment and employee and public health and
safety, including those laws relating to the discovery, development, production,
gathering, use, storage, transmission, transportation, treatment and disposal of
Substances,  employee and product safety,  the emission,  discharge,  release or
threatened  release  of  Substances  into the air,  water or land and  clean-up,
remediation and contaminated sites;

"Equipment  Contracts"  means  the  motor  vehicle  leases,   equipment  leases,
conditional  sales  contracts,  title  retention  agreements  and other  similar
agreements relating to equipment between the Company and third Persons;

"Escrow Account" means the account established with the Escrow
Agent in which the Escrow Amount is deposited;

      "Escrow Agent" has the meaning ascribed thereto in Section
2.1(f)(i);

"Escrow Agreement" means the Escrow Agreement between Abraxas,
the Purchaser, the Vendors, Feshbach and the Escrow Agent in
substantially the form of Schedule 7.7;

      "Escrow Amount" has the meaning ascribed thereto in Section
2.1(f)(i);

"Established Contractual Claim" has the meaning ascribed thereto
in Section 9.2(a);

"Excluded Assets" means the "Assets" as defined in the Nevis
Agreement which are to be purchased by Morrison pursuant to the
Nevis Agreement;

"Excluded  Liabilities" means the "Assumed  Liabilities" as defined in the Nevis
Agreement which are to be assumed by Morrison pursuant to the Nevis Agreement;

"Facilities Interests" means the undivided participating
interests of the Company in and to each of the Major Facilities
as set forth in Schedule 1.1(a);

"Feshbach" means Bernard Feshbach, an individual residing in Palo
Alto, California;

"Feshbach  Consulting  Agreement" means the Consulting  Agreement made as of the

<PAGE>




9th day of March,  1990  between  the Company and  Feshbach  and any  amendments
thereto;

"Financial  Statements" means the balance sheet,  income statement and statement
of changes in financial position of the Company for and in respect of its fiscal
year ending on October 31, 1995 which form part of Schedule 3.5;

"GE Consulting  Agreement" means the Consulting Agreement made as of the 9th day
of March,  1990  between the Company  and Gas  Systems III  Corporation  and any
amendments thereto;

"GEPT" means Gas Systems I Corporation, a corporation;

"GEPT II" means Gas Systems II Corporation, a corporation;

"Governmental  Authority" means each federal,  provincial and municipal  agency,
board,  tribunal,  ministry and department having jurisdiction over the Company,
the Assets or any of them;

"Interim Period" means the period from the date of this Agreement
until the Closing Date;

"Investors' Agreements" means collectively:

            (a)   the Unit Subscription Agreement and all amendments
thereto;

(b)   the Shareholders Agreement dated March 9, 1990 between all
of the parties to the Unit Subscription Agreement and all
amendments thereto;

(c) three Class B Stock Subscription Agreements each dated March 9, 1990 between
the Company and GEPT,  Morrison and Feshbach,  respectively  and all  amendments
thereto;

"Jefferies" means Jefferies & Company Inc., a company organized
and existing under the laws of the State of Delaware;

      "Jefferies Indemnification Letter" has the meaning ascribed
thereto in Section 3.7;

"Joint Venture Audit" has the meaning ascribed thereto in Section
9.3(a);

"July 31 Balance Sheet" means the unaudited  balance sheet for the Company as at
the close of business on July 31, 1996  restated to exclude the Excluded  Assets
(determined  without regard to whether any of the Company's accounts  receivable
were or were not  collected  after July 31, 1996) and the  Excluded  Liabilities
(determined  without regard to whether any of the Company's  liabilities were or
were not settled or paid after July 31, 1996), which forms part of Schedule 3.5;


                                       
<PAGE>



"Lands"  means  collectively  all of the lands owned by the  Company  other than
lands included in the Excluded Assets, and includes the lands referred to in the
Property Schedule and the Petroleum Substances within, upon or under such lands,
together with the right to explore for and produce such Petroleum Substances;

"Leases" means  collectively  all of the leases  (including gas storage leases),
options for  leases,  subleases,  licences  (including  exploratory  licences of
occupation) and documents of title (or any replacements,  renewals or extensions
thereof  or  leases  derived  therefrom)  covering  the  Lands  and owned by the
Company,  including those described in the Property Schedule, by virtue of which
the  holder  thereof  is  granted  certain  rights  with  respect  to  Petroleum
Substances  within,  upon or under the  Lands or by  virtue of which the  holder
thereof is deemed to be entitled to a share of Petroleum Substances removed from
the Lands or any lands with which the Lands are pooled or unitized but excluding
any included in the Excluded Assets;

"Major Facilities" means the gathering, compression and
transportation facilities described in Schedule 1.1(a);

"Management Agreements" means collectively:

(a) the  Administration  Agreement  dated March 9, 1990  between the Company and
Morrison and the  Management  Agreement  dated March 9, 1990 between the Company
and  Morrison  and  all  amendments  to  either  of  such   agreements   (herein
collectively the "Morrison Agreements"); and

(b)   the GE Consulting Agreement; and

(c)   the Feshbach Consulting Agreement.

"Material"  means,  when  used  with  reference  to any  contract,  transaction,
agreement,  change,  commitment or effect,  that the economic or monetary  value
thereof to the Company is $500,000 or more;

"Material  Adverse Effect" means any adverse change in the financial  condition,
results of operations,  assets,  liabilities, or business of the Company that is
or may reasonably be expected to be Material to the Company;

"Material Contract" means the Management  Agreements,  the Investors' Agreements
and any other contract or commitment whether oral or written, involving payment,
whether  absolute,  contingent or  otherwise,  to or by the Company in excess of
$500,000 over the term of the contract or commitment or any commitment;

"Miscellaneous  Interests"  means the entire  right,  title and  interest of the
Company in and to all property,  assets and rights (other than the Petroleum and
Natural Gas Rights or the Tangibles) pertaining to the Petroleum and Natural Gas

                                      
<PAGE>




Rights or the Tangibles or any rights relating  thereto and to which the Company
is entitled, including such interests in:

(a) all contracts, agreements, books, records, title opinions and reports, lease
and land files,  compilations,  surveys,  regulatory filings and other documents
(including agreements for the construction, ownership and operation of the Major
Facilities)  relating  directly to the  Petroleum and Natural Gas Rights and the
Tangibles and any rights in relation thereto;

(b) all  subsisting  rights to enter  upon,  use and occupy  the  surface of the
Lands,  any lands with which the Lands have been pooled or  unitized,  any lands
upon which the  Tangibles are located or any lands which are used to gain access
to any of the foregoing;

(c) all subsisting  rights to carry out any operations  relating to the Lands or
any lands with which the Lands have been  pooled or unitized or lands upon which
the Tangibles are located  including all well licences,  rights of way, crossing
agreements and easements;

(d)   all Wells, including the well bores of the Wells;

(e)   all subsisting disposal and injection leases;

(f)   all geological, engineering, geophysical, seismic and other
reports and data;

(g) all  Petroleum  Substances  produced from the Lands (or any lands with which
the Lands have been pooled or  unitized)  which are placed into tanks or storage
after August 1, 1996;

(h)   all intangible assets of any kind associated with any of the
foregoing;

but excluding any such interests relating to the Excluded Assets;

"Morrison" means Morrison Petroleums Ltd., a corporation
continued under the laws of Alberta;

"Nevis Agreement" means the agreement attached as Schedule 6.12;

"Nevis  Proceeds"  means the net cash proceeds  received by the Company from the
sale of the Excluded Assets:

(a) plus the aggregate  amount of cash  receipts by the Company  (other than the
said net cash proceeds from the sale of the Excluded  Assets)  during the period
from August 1, 1996 until the closing of the  transactions  contemplated  by the
Nevis Agreement insofar as the said receipts relate to the "Business" as defined
in the Nevis  Agreement,  and minus the aggregate amount of cash payments by the
Company  during  the  period  from  August 1,  1996  until  the  closing  of the

                                      
<PAGE>




transactions  contemplated by the Nevis  Agreement  insofar as the said payments
relate to the "Business" as defined in the Nevis Agreement;

(b)   minus the aggregate of:

            (i) all legal,  accounting,  finders'  and other  fees and  expenses
incurred  or paid by the  Company in  connection  with the sale of the  Excluded
Assets and the within sale of the Purchased Shares; and

            (ii) the  amount  by which  the  aggregate  fees  payable  under the
Management  Agreements in respect of the period commencing on August 1, 1996 and
ending on the day  immediately  before  the  Closing  exceed  $200,000  for each
complete calendar month (or a pro rata amount for a partial month);

"Notice" has the meaning ascribed thereto in Section 11.4;

      "Notifying Party" has the meaning ascribed thereto in
Section 9.1(a);

"Offering Memorandum" means the Offering Memorandum of Abraxas
and the Purchaser related to the issuance and sale of
approximately U.S. $200 Million of senior notes;

"Old  Debentures"  means all of the debentures  which are as of the date of this
Agreement  uncancelled and which were issued  pursuant to the Unit  Subscription
Agreement  or the  Option  Agreement,  in the  principal  amounts  set  forth in
Schedule 1.1(c);

"Option" means the rights of GEPT II, Morrison and Feshbach  pursuant to Section
1.1 of the Option  Agreement and "Option  Agreement"  means that certain  Option
Agreement  dated  March  9,  1990  between  all  of  the  parties  to  the  Unit
Subscription  Agreement  (other than the Company) and GEPT II and all amendments
thereto;

"Parties"  means the Company, the Vendors, Abraxas and the
Purchaser collectively;

"Party" means either the Company, the Vendors collectively or
Abraxas and the Purchaser collectively;

"Permitted Encumbrances" means:

(a) easements,  rights of way, servitudes,  restrictions or other similar rights
in land,  including  rights of way and  servitudes for highways and other roads,
railways,  sewers, drains, gas and oil pipelines,  gas and water mains, electric
light, power, telephone,  telegraph or cable television conduits, poles, towers,
wires and cables;

(b) the rights reserved to or vested in any grantor,  government or other public
authority by the terms of any Lease or by any statutory provision, including any

                                        
<PAGE>




rights to terminate any Lease or to require annual or other periodic payments as
a condition of the continuance thereof;

(c) liens imposed by statute securing the payment of Taxes other than in respect
of Taxes which are now due or hereafter become due in respect of a period ending
at or prior to the Closing Date;

(d) the  Regulations  and any rights  reserved to or vested in any  Governmental
Authority  to control or  regulate  any of the Assets in any  manner,  including
legally binding  requirements  imposed by statutes or  Governmental  Authorities
concerning  rates of production from operations on any of the Lands or otherwise
affecting recoverability of Petroleum Substances from the Lands;

(e) the rights of third parties to purchase Petroleum  Substances  produced from
the  Lands or any lands  with  which the  Lands  have been  pooled or  unitized,
pursuant  to  production  sales  contracts  or other  contracts  for the sale of
Petroleum  Substances  which  are  described  in  Schedule  3.31  or  which  are
terminable on not more than 60 days' notice;

(f) rights reserved to or vested in any Governmental  Authority to levy taxes on
minerals or the income  therefrom  or to limit,  control or regulate  any of the
Assets  in  any  manner  and  all  applicable  laws,  rules  and  orders  of any
Governmental Authority;

(g)  undetermined  or  inchoate  liens  (including,   processors',   operators',
mechanics',  builders',  materialmens' and similar liens) incurred or created as
security in favour of the Person  conducting  the operation of any of the Assets
arising in the ordinary course of business for the Company's proportionate share
of the costs and expenses of such operations  except in respect of costs now due
or delinquent or which become due or delinquent and relate to a period ending at
or prior to the Closing Date;

(h)  penalties  which  have  arisen  under  operating   procedures  and  similar
agreements  as a  consequence  of elections by the Company  prior to the Closing
Date not to participate in operations on the Lands to which the penalty applies,
and which are described in the Property Schedule;

(i) liens and security interests granted in the ordinary course of business to a
public  utility,  municipality  or  Governmental  Authority in  connection  with
operations pertaining to the Assets;

(j)   all Encumbrances (including lessor's royalties) described in
the Property Schedule;

(k)   all Encumbrances, exceptions, deficiencies and
qualifications set forth in the Title Opinions; and


                                       
<PAGE>



(l)   other Encumbrances which are not, in the aggregate,
Material;

"Person" means any individual, sole proprietorship,  partnership, unincorporated
association,  unincorporated syndicate, unincorporated organization, trust, body
corporate,  natural  person in his  capacity  as  director,  trustee,  executor,
administrator  or other legal  representative,  including any shareholder of the
Company or any affiliate or employee of an officer or manager of the Company;

"Petroleum and Natural Gas Rights" means all of the Company's working interests,
royalty  interests,  production  payments,  profit  and  net  profit  interests,
reversionary interest and other in rem and contractual interests of the Company,
whether  absolute or contingent,  legal or beneficial,  in the Leases and Lands,
including  those  described in the Property  Schedule but excluding the Excluded
Assets;

"Petroleum Substances" means petroleum, natural gas and all related hydrocarbons
(including,   without  limitation,   all  liquid  hydrocarbons)  and  all  other
substances,  whether liquids,  gaseous or solids and whether hydrocarbons or not
(except coal but including sulphur) produced in association with such petroleum,
natural gas or related hydrocarbons;

"Place of  Closing"  means the  offices  of Cahill  Gordon & Reindel  at 80 Pine
Street,  New York, New York, or such other place as may be mutually agreed to by
the Parties;

"Preferential Right" means an option or preferential right of purchase, right of
first  refusal or similar  pre-emptive  rights to purchase  the Assets or any of
them;

"Prime  Rate"  means the rate of interest  established  from time to time by the
Canadian  Imperial Bank of Commerce at its main branch in Calgary,  Alberta,  as
its prime or  reference  lending rate for Canadian  dollar  commercial  loans in
Canada;

"Property Schedule" means the schedule attached as Schedule
1.1(b);

"Purchase  Price"  means  the  cash  consideration  which  will  be  paid by the
Purchaser to the Vendors,  which shall be equal to the Unadjusted Purchase Price
net of the  Adjustments as finally  settled as  contemplated  in Section 2.3 and
minus the adjustments if any made as contemplated in Section 2.9;

"Purchased Shares" means 2,813,738 Class A Shares and
937,910.6663 Class B Shares;

"Purchaser" means Canadian Abraxas Petroleum Limited, a
corporation incorporated under the laws of Canada;


                                       
<PAGE>



"Real Property" means the real property listed in Schedule
1.1(b);

"Real Property Leases" means the real property leases listed in
Schedule 1.1(b);

      "Receiving Party" has the meaning ascribed thereto in
Section 9.1(a);

"Refund" has the meaning ascribed thereto in Section 9.6(e);

"Regulations" means all statutes,  laws, rules, orders and regulations in effect
from time to time and made by Governmental  Authorities having jurisdiction over
the Company or the Assets;

"Representative" has the meaning ascribed thereto in Section 1.8;

"Royalties" means all royalties, burdens, profits interests, production payments
and similar interests payable to the Crown, lessors and other Persons in respect
of or relating to the production or sale of Petroleum Substances;

"Schedule" has the meaning ascribed thereto in Section 1.9;

"Section 116 Certificate" means a certificate as contemplated in
Section 116 of the Act;

"Securities" means collectively the Purchased Shares, the Option,
the Old Debentures and the Debentures;

"Substance"   means  petroleum,   natural  gas,  or  other   hydrocarbons,   any
contaminant,  pollutant, waste, hazardous waste, toxic substance, dangerous good
or  hazardous  substance  that is likely  to cause  harm or  degradation  to the
environment or risk to human health or safety;

      "Substantial" and "Substantially",  when used in Sectionsa6.1 and 7.1 with
reference  to  the  truth  and  correctness  of a  Party's  representations  and
warranties,   mean  that  the  aggregate   adverse  effect  of  the  untruth  or
incorrectness  of all of the Party's  representations  and  warranties  does not
exceed  $3  Million,   measured  by   reference  to  the  cost  of  making  such
representations and warranties true and correct;

"Tangibles" means:

(a) the interests of the Company in and to all tangible depreciable property and
assets which are situate in, on or about the Lands or lands with which the Lands
have been  pooled or unitized or used or  intended  for use in  connection  with
production of Petroleum  Substances from the Lands or lands with which the Lands
have been pooled or unitized or for the gathering, processing,  transmission, or
treatment of such Petroleum Substances including production tubing, wellheads,

                                      
<PAGE>



pipelines, flowlines, gathering systems, batteries, plants, and
other equipment, but excluding the Major Facilities and the
Excluded Assets; and

(b)   the Facilities Interests;

"Tax Returns"  means all returns,  reports,  declarations,  elections,  filings,
information returns and statements required to be filed in respect of Taxes;

"Taxes" includes all income,  capital, goods and services,  excise, property and
other taxes,  duties,  fees, premiums,  assessments,  imposts,  levies and other
charges of any kind  whatsoever  imposed or exigible by or payable to any taxing
or other governmental authority or agency within or outside of Canada,  together
with all interest, penalties or additional amounts imposed in respect thereof;

"Termination Agreements" means collectively:

      (a)   an agreement between the Company and Morrison to
terminate the Morrison Agreements, in the form of Schedule
6.13(a);

      (b)   an agreement between the Company and Feshbach to
terminate the Feshbach Consulting Agreement, in the form of
Schedule 6.13(b);

      (c) an agreement  between the Company and Gas Systems III  Corporation  to
terminate the GE Consulting Agreement, in the form of Schedule 6.13(c); and

      (d)   an agreement between the Company and the Vendors to
terminate the Investors' Agreements and the Option Agreement, in
the form of Schedule 6.13(d);

"Title Opinions" means collectively:

      (i) the title opinion of BJV dated  September 10, 1996 and entitled "Title
Opinion" in respect of certain  Petroleum  and Natural Gas Rights  owned by CGGS
Canadian Gas Gathering Systems Inc. (herein the "BJV Title Opinion");

      (ii) the title opinions of Code Hunter,  Barristers and Solicitors,  dated
July 25,  December 16 and  December  18, 1991  addressed  to the  Company,  with
respect to certain of the Petroleum and Natural Gas Rights; and

(iii) the title opinion of Howard Mackie, Barristers and Solicitors,  dated July
25, 1991 addressed to the Company and Novalta  Resources  Inc.,  with respect to
Petroleum and Natural Gas Rights in the Sundre area;

"Transition  Agreement" means the Transitional  Services Agreement to be entered

                                       
<PAGE>




between Morrison and the Purchaser in the form of Schedule 6.13(e);

"Unadjusted Purchase Price" has the meaning ascribed thereto in
Section 2.1;

"Unit  Subscription  Agreement" means that certain Unit  Subscription  Agreement
dated March 9, 1990 between the Company and the Vendors (other than GEPT II) and
all amendments thereto;

"Vendors" means collectively the persons listed in Schedule
1.1(c);

"Wells" means all abandoned,  producing,  shut-in,  suspended,  injection, water
source and disposal wells located on the Lands or any lands with which the Lands
have been pooled or  unitized,  including  the wells  described  in the Property
Schedule; and

"Working Capital" means the aggregate of:

(a)   the difference between:

      (i)   the amount of the Company's current assets as set forth
on the July 31 Balance Sheet;

and

      (ii)  the aggregate of:

                  (A)   the amount of the Company's current
liabilities as set forth in the July 31 Balance Sheet;  and

                  (B)   the sum of $200,000; and

(b) the  interest  income of the  Company  actually  earned on an accrual  basis
during the period  from and  including  August 1, 1996 until but  excluding  the
Closing Date.

1.2   Certain Rules of Interpretation

(a)   Unless otherwise specified, all references to money amounts
are to Canadian currency.

(b) The  descriptive  headings of Articles and Sections are inserted  solely for
convenience   of  reference  and  are  not  intended  as  complete  or  accurate
descriptions  of content and shall not be used to interpret  the  provisions  of
this Agreement.

(c) The use of words in the  singular or plural,  or with a  particular  gender,
shall not limit the scope or exclude the  application  of any  provision of this
Agreement  or a  Schedule  to such  Person or Persons  or  circumstances  as the
context otherwise permits.


                                       
<PAGE>



(d) Whenever a provision of this Agreement or a Schedule requires an approval or
consent by a party and notification of such approval or consent is not delivered
within the applicable time limit,  then, unless otherwise  specified,  the party
whose  consent or  approval  is required  shall be  conclusively  deemed to have
withheld its consent or approval.

(e) Unless  otherwise  specified,  time periods  within or  following  which any
payment is to be made or act is to be done shall be  calculated by excluding the
day on which the period commences and including the day on which the period ends
and by extending  the period to the next  Business Day following if the last day
of the period is not a Business Day.

(f) Whenever  any payment to be made or action to be taken under this  Agreement
is required to be made or taken on a day other than a Business Day, such payment
shall be made or action taken on the next Business Day following.

(g) The words  "including"  and  "includes"  shall be deemed to mean  "including
without limitation" and "includes without limitation" respectively.

1.3   Entire Agreement

This  Agreement,  including the Schedules to this  Agreement,  together with the
agreements  and other  documents  to be  delivered  pursuant to this  Agreement,
constitute the entire  agreement  between the Parties  pertaining to the subject
matter hereof and supersede all prior agreements,  understandings,  negotiations
and discussions,  whether oral or written, of the Parties other than, subject to
Section  10.1,  the  Confidentiality  Agreement  dated May 28, 1996  between the
Purchaser and the Company (the "Confidentiality Agreement"). The Confidentiality
Agreement shall  terminate if and when Closing occurs.  There are no warranties,
representations  or other agreements  between the Parties in connection with the
subject matter hereof except as specifically  set forth in this Agreement and in
any agreement or document delivered  pursuant to this Agreement.  No supplement,
modification,  waiver,  amendment  or  termination  of this  Agreement  shall be
binding unless executed in writing by the Parties.

1.4   Applicable Law and Jurisdiction

This Agreement shall be construed in accordance with the laws of the Province of
Alberta and the laws of Canada  applicable  in the Province of Alberta  (without
giving  effect to its  conflicts  of law  rules)  and shall be  treated,  in all
respects,  as an Alberta  contract.  Subject to Article  13, each of the Parties
irrevocably attorns and submits to the non-exclusive jurisdiction of any Alberta
court sitting in Calgary in any action or  proceeding  arising out of or related
to this Agreement and irrevocably  agrees that all claims in respect of any such
action or proceeding  shall be heard and determined in such Alberta court.  Each
of the Parties irrevocably waives any "inconvenient forum" or similar defence to

                                       
<PAGE>




the maintenance of such action or proceeding.

1.5   Accounting Terms

All accounting  terms not otherwise  defined in this Agreement have the meanings
assigned to them in  accordance  with  Canadian  generally  accepted  accounting
principles.

1.6   Knowledge

Where a representation or warranty is made in this Agreement on the basis of the
knowledge or awareness of the Company,  such knowledge or awareness  consists of
the knowledge that each and every current officer, manager and supervisor of the
Company (or of Morrison to the extent he or she has  knowledge of the affairs of
the  Company)  has or ought to have  after  diligent  inquiry  (which  shall not
include a physical  inspection of the Assets specifically for the purpose of the
transaction), but does not include the knowledge of any other Person or Persons.

1.7   Liabilities

(a) The obligations and liabilities of each Vendor  hereunder shall be separate,
and not joint,  several or joint and  several.  Except  where an  obligation  or
liability  hereunder is the  obligation  or  liability  of a  particular  Vendor
because it arises out of, results from or is in any manner  connected with (i) a
breach or incorrectness of a particular Vendor's  representations and warranties
set forth in Sections  3.42 to 3.46  inclusive,  (ii) the breach by a particular
Vendor of any of its covenants or agreements hereunder or (iii) a claim based on
the fraud of a particular  Vendor,  each Vendor shall be separately liable for a
percentage of the obligation or liability equal to the particular Vendor's share
of the Purchase Price set forth in Schedule 1.1(c).

(b) The obligations  and liabilities of Abraxas and the Purchaser  hereunder are
joint and several.  Any of the Vendors,  the  Representative and the Company may
bring separate  actions  against  either Abraxas or the Purchaser  without first
having  proceeded  against  the other,  in respect  of any such  obligations  or
liabilities,  and shall not be required to exhaust their recourse against either
Abraxas or the Purchaser before being entitled to performance from the other.

1.8   Joint Rights

(a) The Vendors hereby,  and pursuant to that certain  Representation  Agreement
dated as of the Closing Date between the Vendors and Feshbach,  appoint Feshbach
as their representative  (herein the "Representative") who shall have full power
and authority to make all decisions relating to adjustments  provided in Article
2, to exercise elections and options and take all actions necessary or permitted

                                      
<PAGE>




to be taken pursuant to Article 9, to undertake the defence or settlement of any
claims for which the  Vendors may be required to  indemnify  the  Purchaser,  to
receive the  payments  and  prepayments  contemplated  to be made to the Vendors
pursuant to the provisions of this Agreement,  including  Sections 2.1, 2.3, 2.7
and 9.7, to waive any or all of the conditions  precedent set forth in Article 7
on behalf of the Vendors  other than Morrison and to take all such other actions
provided  herein or in the Escrow  Agreement  to be taken by the  Representative
(and any other actions reasonably related or ancillary  thereto),  including the
power to execute and deliver the Escrow  Agreement  and such other  documents as
may  be  necessary  for  the  foregoing  purposes,  provided  however  that  the
Representative  shall not in any event have any authority to waive, on behalf of
Morrison,  any or all of the  conditions  precedent  set forth in Article 7. The
Vendors  hereby  authorize the  Representative  to deliver the Debentures to the
Company  marked  paid-in-full  upon  payment of the  principal  and all interest
accrued but unpaid thereon as contemplated in Section 9.7.

      (b) All actions to be taken by the Vendors herein except as may be limited
by  Section  1.8(a)  may  be  taken  by the  Representative.  The  Vendors  also
irrevocably  authorize  the  Representative  to be the  recipient  of any Notice
required to be given or made by the  Purchaser to any of the Vendors  hereunder,
and any Notice received by the  Representative  shall be deemed for all purposes
to be received by all of the Vendors.

      (c) If the  Representative  resigns from such position,  the Vendors shall
promptly  select  another  person  from  among  the  Vendors  (or  their  heirs,
executors, administrators,  personal representatives,  successors or assigns) to
fill such vacancy.  All decisions and actions by the  Representative,  including
any  agreement  between the  Representative  and the  Purchaser  relating to any
negotiated  adjustment of the Purchase  Price,  any defence or settlement of any
claims  for which a Vendor or the  Vendors  may be  required  to  indemnify  the
Purchaser,  any  decision,  action or  agreement  to be made or taken  under the
Escrow Agreement, the Escrow Agreement or any other action provided herein to be
taken by Representative, shall be binding upon all of the Vendors, and no Vendor
shall have the right as between such Vendor and  Purchaser  to object,  dissent,
protest or otherwise contest the same.

(d) The  provisions  of this  Section 1.8 are  independent  and  severable,  are
irrevocable and are coupled with an interest  running in favour of the Purchaser
and shall be enforceable  notwithstanding any rights or remedies that any Vendor
may have in connection  with the  transactions  contemplated  by this Agreement.
Damages as the remedy for any breach of the provisions of this Section 1.8 would
be inadequate, with the result that the Purchaser shall be entitled to temporary
and permanent  injunctive relief without the necessity of proving damages if the

                                       
<PAGE>




Purchaser brings an action to enforce the provisions of this Section 1.8.

      (e) The  provisions  of this  Section 1.8 shall be binding upon the heirs,
executors, administrators,  personal representatives,  successors and assigns of
each Vendor. All fees and expenses of or incurred by the Representative shall be
paid by the Vendors from sources other than the Escrow Amount.


                                       
<PAGE>




1.9   Schedules

The following schedules to this Agreement (herein collectively
the "Schedules"), as listed below, are incorporated in this Agreement:


      Schedule          Description

      Schedule 1.1(a)         Major Facilities
      Schedule 1.1(b)         Property Schedule and List of Wells
      Schedule 1.1(c)         Vendors and Securities
      Schedule 3.5            Financial Statements
      Schedule 3.6            Financial Commitments and AFEs
      Schedule 3.9            Non-Restricted Resource Properties
      Schedule 3.10     Equipment Contracts
      Schedule 3.14           Material Contracts
      Schedule 3.15           Litigation
      Schedule 3.20           Employees
      Schedule 3.21           Insurance
      Schedule 3.23           Bank Accounts
      Schedule 3.25           Environmental Matters
      Schedule 3.31           Production Sale, Processing,
Transportation and Other Contracts
      Schedule 6.7(a)         BJV Opinion
      Schedule 6.7(b)         Vendors' Counsel's Opinion
      Schedule 6.8            Title Opinion Update
      Schedule 6.10           Release
      Schedule 6.12           Nevis Sale Agreement
      Schedule 6.13           Termination Agreements and Transition
Agreement
      Schedule 6.17           Debenture Prepayment Agreement
      Schedule 7.5(a)         BDP Opinion
      Schedule 7.5(b)         Cox & Smith Opinion
      Schedule 7.6            Release
      Schedule 7.7            Escrow Agreement


ARTICLE 2
PURCHASE AND SALE

2.1   Action by Vendors and Purchaser

In accordance with this  Agreement,  the Vendors shall sell,  transfer,  assign,
convey and deliver to the Purchaser,  and the Purchaser  shall purchase from the
Vendors,  the  Purchased  Shares,  and the Vendors  shall cause the Option to be
terminated,  for an aggregate  purchase  price of $115 Million (the  "Unadjusted
Purchase Price"), subject to:

(a)   increases in respect of Working Capital, the Nevis Proceeds
and interest as provided in Section 2.2;

(b) decreases in respect of the principal amount of the Debentures plus interest
accrued but unpaid thereon as at the Closing Date as provided in Section 2.2;

(c)   decreases, if any,  as provided in Section 2.9; and


                                       
<PAGE>



(d) a decrease  equal to  $4,047,088,  being the  aggregate  amount of interest,
expressed in Canadian dollars,  paid by the Company, on the Old Debentures on or
about October 1, 1996 in respect of the period  commencing on August 1, 1996 and
ending on September 30, 1996;

(as so adjusted for Closing, the "Closing Purchase Price"). Each Vendor shall be
entitled to the  percentage of the Purchase Price set forth opposite its name in
Schedule  1.1(c).  At the  Closing  Time,  upon and  subject  to the  terms  and
conditions of this Agreement:

(e)  the  Vendors  shall  transfer  and  deliver  to  the  Purchaser  the  share
certificates representing all of the Purchased Shares duly endorsed in blank for
transfer,  or accompanied by an irrevocable  security transfer power of attorney
duly executed in blank, in either case by the holder of record thereof,  and the
parties  to  the  Option  Agreement  shall  execute  and  deliver  an  agreement
terminating the Option, and shall take such steps as shall be necessary to cause
the  Company  to enter the  Purchaser  or its  nominee(s)  upon the books of the
Company  as the  holder of the  Purchased  Shares and to issue one or more share
certificates  to the  Purchaser or its  nominee(s)  representing  the  Purchased
Shares; and

(f)   the Purchaser shall pay the Closing Purchase Price as
follows:

      (i) $5.75 Million  (herein the "Escrow  Amount") shall be paid to Montreal
Trust Company of Canada, as the escrow agent (herein the "Escrow Agent"),  to be
held and distributed pursuant to the Escrow Agreement; and

      (ii) the  remainder  of the  Closing  Purchase  Price shall be paid to the
order of the Representative by wire transfer in immediately  available funds (to
an account at a financial institution to be designated by the Representative not
later than 2 Business  Days prior to Closing) and forthwith  thereafter  paid by
the  Representative  to the order of each Vendor in the  respective  amounts set
forth in Schedule 1.1(c) by wire transfer in immediately  available funds to the
account designated by each Vendor at least 2 Business Days prior to Closing.

2.2   Adjustments to Purchase Price

(a)   The Unadjusted Purchase Price shall be increased by an
amount equal to the aggregate of:

      (i)   the Working Capital; and

      (ii)  the Nevis Proceeds.

(b) The  Unadjusted  Purchase  Price shall be  increased  by an amount  equal to
interest on the  Unadjusted  Purchase Price at the Prime Rate from and including

                                       
<PAGE>




August 1, 1996 to but  excluding the Closing  Date,  calculated  monthly and not
compounded.

(c) The  Unadjusted  Purchase  Price shall be reduced by an amount  equal to the
principal  amount of the Debentures plus interest  accrued but unpaid thereon as
at the Closing Date.

(d)   The unadjusted Purchase Price shall be decreased as set
forth in Section 2.1(d).

2.3   Closing and Post-Closing Adjustments

(a) The Company  shall  initially  prepare and,  not later than 5 Business  Days
prior to the Closing  Date,  deliver a draft  statement  of Closing  adjustments
(herein the "Closing  Statement") as contemplated in Sections 2.1(a) and (b), to
the Purchaser for review.  The  Representative and the Purchaser shall cooperate
in settling and agreeing to the amounts to be set forth on the Closing Statement
to be used pursuant to the provisions of this Section 2.3. The Closing Statement
shall be utilized for the purpose of settling for Closing the  adjustments to be
made pursuant to Sectiona2.2 (herein the "Adjustments") and shall also set forth
the adjustments, if any, to be made pursuant to Section 2.9.

(b) Forthwith  after  Closing,  in order to settle the  Adjustments  finally and
thereby to settle the Purchase Price, the Purchaser and the Representative shall
cause the Adjustments, including the July 31 Balance Sheet insofar as it relates
to the Adjustments,  to be audited jointly by their respective  auditors (herein
the  "Auditors"),  in  accordance  with  generally  accepted  Canadian  auditing
standards.  The Representative and the Purchaser shall cooperate fully with such
audit so as to cause the  Auditors to complete  such audit  within 90 days after
the  Closing  Date.  The   Representative  and  the  Purchaser  shall  have  the
opportunity,  at their own expense, to review the work papers of the Company and
the Auditors  relating to such audit.  If the Purchaser  and the  Representative
agree with all changes  resulting from the said audit, the July 31 Balance Sheet
insofar as it relates to the  Adjustments as so audited and changed  (herein the
"Audited  Balance  Sheet") shall for the purposes of this Article 2 be deemed to
be the  July 31  Balance  Sheet as  revised  by  virtue  of such  audit  and the
Adjustments shall be recalculated to take all revisions resulting from the Audit
into account.  If either or both of the Purchaser and the  Representative do not
agree  with any of the said  changes  resulting  from the said  audit,  or their
respective  Auditors do not agree as to any matter,  either the Purchaser or the
Representative  may,  within 15 Business Days after receipt by it or them of the
Audited  Balance  Sheet and the  statement of the  recalculated  Adjustments  or
notice from one of the Auditors of any such  disagreement,  give written  notice
(an "Audit Notice") of any such disagreement,  with reasons, to the other Party.
If neither the Purchaser nor the Vendor  notifies the other of any  disagreement
within 15 Business  Days after its receipt of the Audited  Balance Sheet and the

                                       
<PAGE>




recalculated  Adjustments  they  shall be deemed to have  accepted  the  Audited
Balance Sheet and the recalculated  Adjustments as so changed. The Purchaser and
the  Representative  shall have reasonable access to the other's records and the
records of the Company in order to resolve any disagreements.

(c) If a  disagreement  is made the subject of an Audit Notice and the Purchaser
and the  Representative  fail to resolve  such dispute  within 10 Business  Days
after the date on which the Purchaser or the Representative gave an Audit Notice
with  respect  to  the  proposed  change,  then  the  Calgary  office  of  Price
Waterhouse,  Chartered  Accountants  (herein the  "Accounting  Firm"),  shall be
engaged forthwith to resolve any remaining  disputes.  The Accounting Firm shall
be required to render its decision  within 25 Business Days after the dispute is
referred to it. The decision of the Accounting  Firm shall be final and binding.
The fees and  expenses  of the  Accounting  Firm shall be shared  equally by the
Vendor and the Purchaser.

(d)  Payment of any  amount  arising by virtue of changes in the July 31 Balance
Sheet or the  Adjustments  pursuant  to this  Section  2.3 shall be  subject  to
Sectiona116 of the Act, shall be made within 10 Business Days after the disputed
portion has been agreed upon by the Parties or determined by the Accounting Firm
pursuant to this Section  2.3, and shall  include in addition an amount equal to
interest  at the Prime  Rate  calculated  from the  Closing  Date to the date of
payment.

2.4   Place and Time of Closing

The Closing shall take place at the Place of Closing on the Closing Date.

2.5   Tender

Any tender of documents or money pursuant to this Agreement may be made upon the
Parties or their respective counsel and, subject to Section 2.1(e),  money shall
be tendered by  official  bank draft drawn upon a Schedule 1 Canadian  chartered
bank.

2.6   Section 116 Certificate

The Vendors shall,  prior to Closing,  make reasonable efforts to obtain Section
116 Certificates in respect of the Purchase Price.

2.7   Deposit

(a) The Parties  acknowledge that the Purchaser has paid a deposit of $2 million
(herein the "Deposit"),  which shall be held in an  interest-bearing  account by
the  Representative  and  disposed of in  accordance  with this Section 2.7. The
Deposit shall be invested in an instrument  selected by the  Representative,  of
which it gives  timely  written  notice  to the  Purchaser  and  which  shall be

                                      
<PAGE>




available  for  investment  or  purchase  at the branch of a Schedule 1 Canadian
chartered bank in Calgary.

(b) If Closing occurs, the Deposit, together with interest earned thereon by the
Purchaser  while it is held in  trust,  shall be paid to the  Representative  at
Closing and applied against the Closing Purchase Price.

(c) If  Closing  does not occur,  notwithstanding  that the  Vendors  are ready,
willing and able to complete the sale of the  Purchased  Shares and to terminate
the Option as  contemplated  herein,  the  Section  116  Certificates  have been
received and all of the conditions  precedent set forth in Article 6 (other than
in Section 6.9, if it has not then been  satisfied,  complied  with or waived in
writing  by the  Purchaser)  have  been  satisfied,  complied  with or waived in
writing by the Purchaser or Abraxas,  the Deposit  together with interest earned
thereon  shall be  forfeited  to the  Vendors (in the  proportions  set forth in
Schedule  1.1(c)),  in full and  complete  satisfaction  of all claims which the
Vendors may have in connection  with  Purchaser's  failure or refusal to perform
its obligations hereunder.

(d) If Closing  does not occur for any reason other than as set forth in Section
2.7(c) or this Agreement terminates pursuant to Section 12.1(a)(ii), the Deposit
together with interest earned thereon shall be paid to the Purchaser.

2.8   Limitation

Notwithstanding  any other  provision  of this  Agreement  or any rule of law or
equity,  the  maximum  amount of  damages  and other  compensation  to which the
Purchaser  shall be  entitled  if  Closing  does not occur  solely or  partially
because of the  failure or refusal of the  Company  and the Vendors or either of
them to perform  their  obligations  hereunder is $2 million,  which shall be in
addition to the return of the Deposit plus interest  thereon as  contemplated in
Section 2.7(d).

2.9   Representations and Warranties; Material Adverse Damage

If any of the representations and warranties set forth in Article 3 are not true
and  correct  on the  Closing  Date,  or  physical  damage  occurs to any of the
Petroleum and Natural Gas Rights,  Tangibles or Miscellaneous  Interests and the
uninsured portions of the cost of repair is less than $3 Million,  (or more than
$3 Million and the Parties agree to reduce the Purchase Price by such amount) as
the case may be,  then,  subject to  Articles 6 and 7, the  Unadjusted  Purchase
Price shall be decreased  at Closing by an amount equal to the cost,  if any, of
making the  representations  and warranties true and correct on the Closing Date
and of the uninsured costs of repair,  as the case may be, and the Parties shall
in good faith attempt to agree on the said amounts. If the Parties are unable to
agree on  either  or both of the said  amount  or  amounts,  the said  amount or
amounts shall be settled by  arbitration  in accordance  with Article 13 and the

                                      
<PAGE>




Closing Date shall be extended in order for the  arbitration  proceedings  to be
conducted and the  arbitrator's  decision to be rendered.  The Parties shall use
their best efforts to cause the arbitration  proceedings to be conducted and the
arbitrator's  decision to be rendered  within 20 Business Days. For the purposes
of a dispute as to the said amount under this  Section  2.9,  the notice  period
contemplated in Section 13.1(b) shall be 1 Business Day.

2.10  [Intentionally Deleted]


ARTICLE 3
REPRESENTATIONS AND WARRANTIES OF THE VENDORS AND THE COMPANY

The  Company  hereby  makes  the  representations  and  warranties  set forth in
Sections 3.1 to 3.41, inclusive, to the Purchaser.

3.1   Incorporation and Registration

The Company is a corporation duly incorporated,  organized, validly existing and
in good standing under the laws of Canada and has all necessary corporate power,
authority  and  capacity  to own its  properties  and assets and to carry on its
business as  presently  conducted.  Neither the nature of its  business  nor the
location or character of the properties  owned or leased by the Company requires
the  Company to be  registered,  licensed  or  otherwise  qualified  as an extra
provincial or foreign  corporation or to be in good standing in any jurisdiction
other than in the Province of Alberta. The Company is duly registered,  licensed
and otherwise  qualified and in good standing for such purpose in such province.
The Company has all governmental  licences and permits (other than Environmental
Approvals,  which are referred to in Section 3.25)  necessary or  appropriate to
own and operate (to the extent it is the  operator  thereof)  the Assets and the
Excluded Assets and the Company is in Material compliance with all such licences
and permits.

3.2   Subsidiaries

The Company has no subsidiaries.

3.3   Capital

(a) The authorized  share capital of the Company consists of an unlimited number
of Class A Shares and Class B Shares. The Purchased Shares constitute all of the
issued and  outstanding  shares in the  Company and all of such shares have been
duly and validly  issued and are  outstanding  as fully paid and non  assessable
shares of the  Company.  There  are no  options,  warrants,  calls,  rights,  or
agreements to which the Company or any Vendor is a party or by which it is bound
obligating the Company or any Vendor to issue, deliver or sell, or cause to be

                                       
<PAGE>



issued,  delivered or sold,  shares of capital stock or other  securities of the
Company or obligating  the Company or any Vendor to grant,  extend or enter into
any such  option,  warrant,  call,  right or  agreement,  and no  securities  or
obligations  convertible  into or exchangeable for shares or other securities of
the  Company  have been  authorized  or agreed to be issued or are  outstanding,
otherwise than pursuant to the Option Agreement.

(b) The Old Debentures  constitute all of the issued and outstanding  debentures
which were issued  pursuant to the Unit  Subscription  Agreement  and the Option
Agreement.  Upon the  issuance  of the  Debentures  the Old  Debentures  will be
canceled  and the Company will have no further  obligation  or duty with respect
thereto.

(c) The share and debenture  registers will immediately prior to Closing reflect
the  ownership  of  Purchased  Shares and  Debentures  as set forth in  Schedule
1.1(c).

3.4   Absence of Conflicting Agreements

The execution and delivery of this Agreement does not, and the  consummation  of
the transactions  contemplated  hereby and compliance with the provisions hereof
will not,  conflict  with,  or result in any  violation  of, or default (with or
without  notice  or  lapse  of  time,  or  both),  or give  rise  to a right  of
termination,  cancellation or acceleration of any obligation or to the loss of a
material  benefit,  or result in the  creation  of any  lien,  pledge,  security
interest,  adverse claim, charge, or other encumbrance upon any of the Assets or
the  Excluded  Assets  (any  such  conflict,   violation,   default,   right  of
termination,  cancellation  or  acceleration,  loss or creation,  a "Violation")
pursuant to, any provision of:

      (a) the Articles of Incorporation,  as amended, or By-laws, as amended, of
the Company (a true and complete copy of each of which as of the date hereof has
been delivered to the Purchaser);

      (b)  any  contract,  agreement,  loan or  credit  agreement,  note,  bond,
debenture, mortgage, indenture, lease, employee benefit plan or other agreement,
obligation,  instrument, permit, concession, franchise, or license applicable to
the Company, the Assets or the Excluded Assets (a true and complete copy of each
of which as of the date hereof has been delivered to Purchaser); or

      (c) any judgment, injunction, order, decree, statute, law, ordinance, rule
or regulation applicable to the Company or the Assets or the Excluded Assets.

3.5   Financial Statements

Except  insofar  as the July 31  Balance  Sheet  excludes  the  Excluded  Assets
(determined  without regard to whether any of the Company's accounts  receivable

                                      
<PAGE>




were or were not  collected  after July 31, 1996) and the  Excluded  Liabilities
(determined  without regard to whether any of the Company's  liabilities were or
were not settled or paid after July 31, 1996):

(a) the  Financial  Statements  and the July 31 Balance  Sheet and the books and
accounts of the Company have been prepared in accordance with Canadian generally
accepted  accounting  principles  applied  on a basis  consistent  with  that of
preceding periods;

(b) the Financial Statements and the July 31 Balance Sheet present fairly all of
the assets and liabilities  and the financial  position of the Company as at the
respective dates thereof;

(c)   the Financial Statements present fairly the results of
operations and statement of changes in financial position for the
periods then ended;

(d) except to the extent  reflected  or reserved  against in the July 31 Balance
Sheet or as otherwise  disclosed in Schedule 3.5, the Company has no outstanding
indebtedness, liabilities or obligations, whether contingent or absolute;

(e) the Financial Statements and the July 31 Balance Sheet have been prepared in
accordance with the books and accounts of the Company; and

(f) the  statement  of income  included  in the  Financial  Statements  does not
include any items of special  nonrecurring income or any other income not earned
in the ordinary course of business except as expressly specified therein.

3.6   Absence of Unusual Transactions

Except for the sale of the Excluded  Assets and the  assumption  of the Excluded
Liabilities as contemplated by the Nevis Agreement, or as otherwise disclosed in
Schedule 3.6 or as permitted in Section 8.1, since July 31, 1996 the Company has
not:

(a)   transferred, assigned, sold or otherwise disposed of any of
the Assets or canceled, waived or released any debts or claims;

(b)  mortgaged,  pledged,  subjected  to lien,  granted a security  interest  or
otherwise  encumbered  any  of its  assets  or  property,  whether  tangible  or
intangible, other than Permitted Encumbrances;

(c)  authorized,  incurred  or assumed  any  capital  expenditure  or  financial
commitment or other obligation or liability  (fixed or contingent)  except those
listed  in the July 31  Balance  Sheet  and  except  unsecured  obligations  and
liabilities  incurred  in the  ordinary  and usual  course of  business  and not
exceeding $500,000 in the aggregate;

                                       
<PAGE>



(d)  suffered  an  extraordinary  loss,  waived or omitted to take any action in
respect of any rights of  substantial  value,  or entered into any commitment or
transaction not in the ordinary and usual course of business;

(e) issued or sold any shares in its capital or any warrants,  bonds, debentures
or other corporate securities of the Company or issued, granted or delivered any
right, option or other commitment for the issuance of any such securities or any
other securities;

(f)   amended or changed or taken any action to amend or change
its Articles of Incorporation or By-laws;

(g)   authorized, agreed or otherwise become committed to do any
of the foregoing; or

(h) from  August  1,  1996 to the date of this  Agreement,  breached  any of the
provisions  of Section 8.1 (which shall be read for the purposes of this Section
3.6(h) as if the  Interim  Period  commenced  on August 1, 1996 and ended on the
date of this Agreement).

3.7   Absence of Guarantees

Except  for  indemnities  set  forth  in  the  By-Laws  of the  Company,  in the
Management  Agreements and in the  indemnification  letter agreement (herein the
"Jefferies  Indemnification Letter") dated February 26, 1996 between the Company
and Jefferies described in Schedule 3.14, the Company has not given or agreed to
give, and is not a party to or bound by any guarantee or indemnity in respect of
indebtedness  or other  obligations,  of any Person or any other  commitment  by
which the Company is or may be  responsible or liable for such  indebtedness  or
other  obligations,  provided that if any claim is made by Jefferies against the
Company for  indemnification  pursuant to the said letter agreement,  the amount
claimed by  Jefferies  shall be treated as Damages as defined in Section  9.1(a)
and all of the  provisions  of  Article  9 with  respect  to  Damages  shall  be
applicable.

3.8   Restrictive Covenants

Except for the Management Agreements,  the Company is not a party to or bound or
affected by any commitment,  agreement or document containing any covenant which
limits the  freedom of the  Company  to compete in any line of  business,  or to
transfer or move any of its Assets or  operations or which affects or may affect
the business  practices,  operations or conditions or the continued operation of
the business of the Company after the Closing on substantially the same basis as
such businesses are carried on at the date of this Agreement.



                                       
<PAGE>

3.9   Tax Matters

(a) The Company has duly and timely filed its Tax Returns  with the  appropriate
taxing or other  governmental  authority  or  agency  and its Tax  Returns  were
prepared  in  accordance  with the books and  accounts  of the  Company  and the
information  contained in such Tax Returns is true, complete and accurate in all
Material respects.

(b) The Company has duly and timely paid all Taxes,  including all  installments
on account of Taxes for the current year,  that it reasonably  believed were due
and  payable  by it and the July 31  Balance  Sheet  sets  forth,  as an  amount
payable, an amount not less than the amount of all Taxes that are or will become
due and  payable in  respect  of  periods  ending on or prior to August 1, 1996,
except amounts which may become payable after  completion of the current Revenue
Canada income tax audit for the  Company's  1993,  1994 and 1995 taxation  years
which are not individually or in the aggregate Material.

(c) The Company has not  entered  into any  agreement  or other  arrangement  or
executed any waiver except with respect to its 1991 tax year  providing for, any
extension of time within which (i) to file any Tax Return covering any Taxes for
which the  Company is or may be liable,  (ii) the  Company is required to pay or
remit any Taxes or amounts on account of Taxes or (iii) any taxing authority may
assess or collect Taxes for which the Company is or may be liable.

(d) The Canadian  federal and provincial  income and capital tax  liabilities of
the Company have been assessed by the relevant  taxing  authority and notices of
assessment have been issued to the Company by the relevant taxing  authority for
all taxation years ending on or prior to October 31, 1995, provided however that
amended returns have been filed in respect of the Company's 1991, 1992, 1993 and
1994 tax years and no  reassessments or confirmations of increases or losses has
been received in respect thereof.

(e) There are no actions, suits, proceedings,  investigations,  audits or claims
now pending or, to the knowledge of the Company, threatened, against the Company
in  respect  of any Taxes and there are no  matters  under  discussion  with any
taxing authority relating to Taxes, except as described in Section 3.9(b).

(f) The Company has duly and timely withheld from any amount paid or credited by
it  to or  for  the  account  or  benefit  of  any  Person,  including,  without
limitation,  any of its employees,  officers and directors and any  non-resident
Person, the amount of all Taxes and other deductions  required by any applicable
law,  rules or  regulations to be withheld from any such amount and has duly and
timely  remitted  the  same to the  appropriate  taxing  or  other  governmental
authority or agency.

(g)   The Company is not a section 1504(d) corporation for United
States tax purposes and has not filed consolidated United States tax returns.

                                       
<PAGE>





(h) The Company is not an "above-limit  corporation",  "restricted corporation",
member of an "above-limit partnership" or "restricted partnership" or associated
with a  "restricted  corporation"  as those  phrases are defined and used in the
Alberta  Corporate Tax Act, as amended (herein the "Corporate Tax Act"), and the
Company is not the subject of a direction by the Provincial  Treasurer (Alberta)
pursuant to  subsection  26.1(9) or (10) of the  Corporate Tax Act, nor does the
Company nor the Vendors have any reason to believe that the provincial treasurer
is contemplating  or likely to make any such direction.  Each of the Assets is a
"restricted  resource  property" as defined in the Corporate Tax Act,  except as
described in Schedule 3.9.

(i) Immediately before Closing, the following tax pools of the Company,  will be
at least:

            (i)   Undepreciated capital cost                            $0
                  (as defined for the purposes of the Act)

            (ii)  Cumulative Canadian development expense               $1.3
million
                  (as defined in Section 66.2(5) of the Act)

            (iii)       Cumulative Canadian oil and gas property
expense     $25.5 million
                  (as defined in Section 66.4(5) of the Act)

            (iv)  Cumulative Canadian exploration expense               $0
                  (as defined in Section 66.1(6) of the Act)

            (v)   Undeducted non-capital losses             $4.2 million
                  (as defined in Section 111(8) of the Act)

3.10  Equipment Contracts

Schedule 3.10 sets forth a true and complete list of the Equipment Contracts and
the equipment and vehicles which are subject to Equipment Contracts.  All of the
Equipment  Contracts  are in full force and effect and no default  exists on the
part of the  Company or, to the  knowledge  of the  Company,  on the part of any
other party  thereto and the  Company  has not  received  notice of an intent to
terminate  or amend such  contracts by the other party  thereto.  Except for the
Excluded Assets,  equipment and vehicles subject to the Equipment Contracts, and
the vehicles and other  equipment  described in Schedule  3.10,  no Person other
than the  Company  owns any  equipment,  vehicles  or other  tangible  assets or
property used in or necessary for the operation of the business of the Company.

3.11  Real Property and Real Property Leases

The Company owns no real property or interests  therein,  and is not a party to,

                                       
<PAGE>




or bound by,  any  leases or  subleases  of any real  property,  other  than its
interests in the Lands, the Leases and the Major Facilities.

3.12  Title to Assets

(a) The  Assets  are and  will be at the  Closing  Time  free  and  clear of all
Encumbrances  created by,  through or under the  Company,  except for  Permitted
Encumbrances.

(b) The Company has not done or failed to do any act or thing whereby any of the
Petroleum  and Natural Gas Rights or Tangibles  may become  liable or subject to
termination, surrender, forfeiture, cancellation or alienation.

3.13  Quiet Enjoyment

Except  for  interruptions  which in the  aggregate  would  not have a  Material
Adverse Effect, subject to the rents, covenants,  conditions and stipulations in
the Leases and on the lessee's or holder's part thereunder to be paid, performed
and observed and to the Permitted Encumbrances, the Company, after Closing, will
continue  to  hold  and  enjoy  the  Petroleum  and  Natural  Gas  Rights,   the
Miscellaneous  Interests and the Tangibles for the remainder of their respective
terms  and all  renewals  or  extensions  thereof  after  Closing,  without  any
interruption of or by the Vendors or any other person (other than the Purchaser)
whomsoever  claiming  or to claim the same or any part  thereof or any  interest
therein by, through or under the Company or the Vendors.

3.14  Material Contracts

(a) Schedule  3.14 is an accurate and complete  list of all Material  Contracts,
other than those described in any other Schedule.  All of the Material Contracts
are in full force and effect,  unamended,  and the Company is not in and has not
received notice of any Material default in respect of any such Material Contract
or commitment by it or any of the parties to any such Material  Contract,  which
default has not been  rectified  as of the date of this  Agreement.  None of the
other parties to any of the Material  Contracts have given notice to the Company
of their intention to terminate or amend any of the Material  Contracts,  except
as specifically contemplated herein.

(b) Except as disclosed in Schedule 3.14, the Company is not a party to any oral
or  written  (i)  confidentiality  or  standstill   agreement,   non-competition
agreement or other Material  agreement or contract which, after giving effect to
the  transactions  contemplated by this Agreement,  purports to restrict or bind
the Company or any of its affiliates or (ii)  collective  bargaining  agreement.
Except as disclosed in the Property Schedule,  the Company is not a party to any
contract or agreement granting a preferential right of purchase or similar right
to any Person with respect to any of the Assets.

                                       
<PAGE>



3.15  Litigation

Except as  disclosed in Schedule  3.15,  there is no suit,  action,  litigation,
investigation,  claim, complaint, grievance or proceeding, including appeals and
applications  for review,  in progress  or pending or, to the  knowledge  of the
Company,  threatened,  by or against or  relating  to the  Company or any of its
assets or businesses which, if determined adversely to the Company, would have a
Material  Adverse  Effect.  Except as disclosed in Schedule  3.15,  there is not
presently outstanding against the Company any judgment, decree, injunction, rule
or order of any  court,  governmental  department,  commission,  board,  bureau,
agency or  arbitrator  which  could  reasonably  be  expected to have a Material
Adverse Effect.

3.16  Compliance with Terms

The Company has complied  with,  performed,  observed and  satisfied  all terms,
conditions,  obligations and liabilities  which have arisen prior to the Closing
Date and were the  obligations of the Company under any of the provisions of any
law, statute, order, writ, injunction or decree of any Governmental Authority or
court and in respect of which there could occur a Material Adverse Effect if not
complied with, performed, observed or satisfied.

3.17  Title Documents and Production Sales Contracts

The  Company  has  made  available  for  inspection  by  the  Purchaser  or  its
representatives:

(a)   all documents, instruments, records and books relevant to
title to the Assets and the operation thereof; and

(b) all production  sales contracts and other contracts within the possession or
control of the Company for the sale of Petroleum  Substances  produced  from the
Lands or lands with which the Lands have been pooled or unitized.

3.18  Production and Accounts Receivable

Except for those non-payments which in the aggregate will not exceed $150,000:

(a)  payments  of  production  revenue  and  deliveries  in kind in  respect  of
Petroleum Substances produced from the Lands are being paid or made, as the case
may be, to the Company  consistent with the ordinary practice in the oil and gas
industry; and

(b) the amount of all accounts receivable, unbilled invoices and other debts due
or recorded in the records and books of account of the Company as  reflected  on
the July 31 Balance Sheet are valid, enforceable and collectible and none of the
accounts  receivable  reflected in the July 31 Balance  Sheet are subject to any
counterclaim  or set-off  except to the extent  reflected in the July 31 Balance
Sheet.

                                       
<PAGE>





3.19  Employment Matters

The Company does not have any  employees.  The Company has not  established  any
severance,  pension,  retirement or other individual or group employment benefit
plans.

3.20  Employees

Schedule 3.20 is a true and complete list of all  individuals  who are currently
employees  of  Morrison  and who are  employed  full-time  by  Morrison  so that
Morrison can perform its services under the Morrison Agreements.

3.21  Insurance

Schedule 3.21 sets forth a true and complete list and brief summary of the terms
of all of the  Company's  insurance  policies (in this Section  3.21,  the "said
documents").  The Company  maintains or causes to be maintained such policies of
insurance, issued by responsible insurers, as are appropriate to its operations,
property and assets,  in such amounts and against such risks as are  customarily
carried and insured against by owners of comparable  operations,  properties and
assets. All of the said policies are in full force and effect and the Company is
not in default,  as to the payment of premium or  otherwise,  under the terms of
any such  policy.  None of the said  policies  contains a provision  whereby the
insurer is entitled to terminate the said policy  because of the sale of control
of the Company pursuant to this Agreement.

3.22  Copies of Agreements etc.

A current and complete copy of each of the  contracts,  commitments,  mortgages,
leases,  instruments  and other  documents  identified in the Schedules (in this
Section 3.22, the "said  documents"),  including the Material  Contracts and all
amendments  thereto,  has been made  available for  inspection by the Purchaser.
There are no  negotiations  presently  occurring  with  respect to the  renewal,
repudiation  or  amendment  of any of the said  documents or any of the Material
Contracts.

3.23  Bank Accounts, etc.

Schedule 3.23 sets forth:

      (a) the name of each  bank and other  depository  with  which the  Company
maintains any bank account,  trust account or safety  deposit box, the number of
each such account and the names of all Persons authorized to draw thereon or who
have access thereto; and

      (b)   the names of all Persons, if any, holding powers of

                                       
<PAGE>



attorney from the Company and a summary statement of the terms
thereof.

3.24  Corporate Records and Minute Books

The corporate  records and minute books of the Company have been made  available
to the  Purchaser at the offices of BJV or the Company and include  complete and
accurate  minutes of all  meetings  of the  directors  and  shareholders  of the
Company held to date and all consent  resolutions  passed by the  directors  and
shareholders,  since the date of its incorporation.  The share certificate book,
register  of  shareholders,  register of  transfers  and  register of  directors
included therein of the Company, are complete and accurate. All of the corporate
records  and  minute  books of the  Company  which  have been  furnished  to the
Purchaser for it to review  accurately  record all Material  transactions of the
Company in all respects and have been maintained consistently in accordance with
good business practices.

3.25  Environmental Matters

Except  as  disclosed  in  Schedule  3.25  or in any of the  reports  and  other
documents described in Schedule 3.25:

(a)   all Environmental Approvals in the possession of the
Company:

      (i)   which are material to the continued operation of Major
Facilities operated by the Company;

      (ii)  which relate to any abandonment, reclamation, work or
remediation obligation of the Company; or

      (iii)       which relate to any Major Facilities not operated
by the Company and which are in the possession of the Company

have been made available to the Purchaser at the Company's
Calgary office for inspection and review by the Purchaser;

(b)  the  Company  and its  operations  and its  Assets  are (1) in  substantial
compliance with all Environmental Laws, (2) are not the subject of any remedial,
preventative  or  control  action,   direction  or  order  by  any  Governmental
Authorities, or any investigation or evaluation by any Governmental Authorities,
as to whether  any  remedial or  preventative  action is needed to respond to an
existing or potential Environmental concern and (3) there is no reasonable basis
for any Person to assert that the Company is liable to any Person as a result of
the  release of any  Substance  into the  Environment  or into any  facility  or
structure;

(c) the Company has made available,  for inspection and review by the Purchaser,
all audits, reports and assessments in respect of Environmental matters relating
to the Assets operated by the Company,  and all audits,  reports and assessments
relating to other Assets, to the extent that the audits, reports and assessments

                                       
 <PAGE>



are within the possession or control of the Vendors or the Company; and

(d) all Environmental Approvals, if any, required to be obtained, held, or filed
by the  Company in  connection  with any aspect of the  business  of the Company
including  those  related to the  treatment,  storage,  disposal or release of a
hazardous  substance,  which  relate to any  abandonment,  reclamation,  work or
remediation  obligation of the Company,  and which are material to the continued
operation of the Assets, have been duly obtained, held or filed and remain valid
and in effect and the Company is in  substantial  compliance  with all terms and
conditions of all such Environmental Approvals;

Notwithstanding any other provision of this Agreement,  this Section 3.25 is the
sole  representation  and warranty of the Company with respect to  Environmental
matters and no other representations or warranties shall be interpreted so as to
apply to,  contemplate or deal with any matter relating to the Environment.  For
the  purposes of this  Section  3.25,  "substantial  compliance"  means that the
aggregate   direct  cost  of  compliance   with   Environmental   Laws  and  the
Environmental  Approvals  referred  to in  Section  3.25(d),  other  than  those
disclosed in Schedule 3.25, would not exceed in the aggregate $1 million.

3.26  No Production Penalties

None of the Wells has been  overproduced such that it is subject to a production
penalty  or  limitation  which  will  result  in it  being  shut in or have  its
production  curtailed,  except  for any such  penalties  which  would not in the
aggregate have a Material  Adverse Effect on the Company or which are of general
application to producing wells in Alberta and any such penalties and limitations
which have resulted from  circumstances  where good oil and gas field  practices
have been  followed  (and  penalties  and  limitations  which  result from prior
production  in excess of  allowables  shall be deemed not to have arisen in such
circumstances).

3.27  No Excess Gas Deliveries

The Company has not  received  notice from a purchaser  of natural gas  produced
from the  Petroleum  and  Natural  Gas Rights  asserting  that the  Company  has
delivered  to such  purchaser  an annual  amount of natural gas in excess of the
amount  which the Company was  entitled to deliver to the  particular  purchaser
under the applicable gas purchase contract.

3.28  Prepaid Gas Obligations

The Company is not obligated by virtue of a prepayment or similar arrangement to
deliver Petroleum  Substances without then or thereafter  receiving full payment
therefor.

                                       
<PAGE>



3.29  Royalty Payments

All Royalties have been properly and timely paid to the Crown, lessors and other
holders of the  Royalties  with respect to all  production or sales of Petroleum
Substances  from the Petroleum and Natural Gas Rights and all filings in respect
of such  Royalties  have been properly made in  accordance  with the  applicable
legislation or agreements.

3.30  Gas Balancing Agreements

The Company is not party to any gas balancing agreements.

3.31  Production Sale Contracts

Except for those  contracts  described in Schedule 3.31 and contracts  which are
terminable on not more than 60 days'  notice,  none of the Petroleum and Natural
Gas Rights are  dedicated  or  otherwise  subject  to any  contractual  or other
arrangement for the sale,  processing or transportation of Petroleum  Substances
produced  therefrom  (or otherwise  related to the  marketing of such  Petroleum
Substances) which would bind the Company or would otherwise  restrict the rights
of the Company to take possession of and market such Petroleum Substances.

3.32  Partnerships

None of the Petroleum and Natural Gas Rights is subject to any tax or common law
partnership  (other  than  any  Permitted  Encumbrances)  except  for  any  such
partnership  created under a joint  operating or similar  agreement to which the
Company is party.

3.33  Capacity

Subject  to  contractual  and  regulatory  restrictions,  all  Wells  which  are
currently  producing  natural  gas in paying  quantities  (which for  clarity is
agreed to  exclude  Wells  which are  abandoned,  capped or shut in or which are
being  produced for test purposes  only) are connected to a gathering  system of
sufficient capacity to permit the continuing delivery of Petroleum Substances in
accordance  with  the  Company's  contractual   obligations  to  buyers  of  its
production for the reasonably foreseeable future.

3.34  Capital Expenditures

Except as  disclosed in or permitted by Schedule 3.6 and subject to Section 8.1,
the Company has not made any oral or written commitments or agreement to acquire
any  assets  (including  under  circumstances  where such  acquisition  would be
classified as a capital expenditure under Canadian generally accepted accounting
principles consistently applied) or make any capital expenditure or contribution
in any individual transaction or project

                                       
<PAGE>



including the drilling, recompletion, reworking, plugging back or abandonment of
any Wells where the purchase price, capital expenditure or contribution required
of the Company,  directly or indirectly,  exceeds $250,000 or in transactions or
projects where the aggregate purchase price, capital expenditure or contribution
exceeds $2 million.

3.35  Engineering Report

In connection with the preparation of the  Engineering  Report,  the Company has
provided to Sproule Associates Limited ("Sproule") all information  requested by
Sproule  which was in the  possession  of the  Company  and would be of Material
relevance to the preparation of the Engineering Report. All such information was
Materially true and complete and did not omit any  information  required to make
it Materially  true and complete  (except for  information  already in Sproule's
possession or publicly available to Sproule).

3.36  [Intentionally Omitted]

3.37  No Business in the United States

All of the Assets and the Excluded  Assets are located outside the United States
and the Company  has not made  aggregate  sales in or into the United  States of
U.S. $25 million or more in the fiscal year ending October 31, 1995.

3.38  Due Authorization

The Company has all  necessary  power  (corporate or  otherwise),  authority and
capacity  to  enter  into  this  Agreement  and  to  carry  out  its  respective
obligations  under this Agreement.  The execution and delivery of this Agreement
and the  consummation  of the  transactions  contemplated in this Agreement have
been duly  authorized  by all necessary  action  (corporate or otherwise) on its
part.

3.39  Enforceability of Obligations

This  Agreement   constitutes  the  Company's   valid  and  binding   obligation
enforceable   against  the  Company  in  accordance   with  the  terms  of  this
Agreement,asubject,  however, to limitations with respect to enforcement imposed
by law in connection  with  bankruptcy or similar  proceedings and to the extent
that equitable  remedies such as specific  performance and injunction are in the
discretion of the court from which they are sought.

3.40  Consents, Approvals or Authorizations

Except for the AEUB  Approval or as otherwise  obtained,  no consent,  approval,
order or authorization of, filing or registration  with, or notification to, any
Governmental Authority or regulatory authority, or consent, approval, order or

                                      
<PAGE>



authorization  of any  Person  (except  those  that  may  not  be  unnecessarily
withheld),  is  required  on its behalf in  connection  with the  execution  and
delivery of this Agreement by the Company or the completion of the  transactions
contemplated by this Agreement.

3.41  Finders' Fees

Except for  finders'  fees which are to be  deducted  in  calculating  the Nevis
Proceeds,  the Company has not incurred any liability,  contingent or otherwise,
for brokers' or finders' fees in respect of the transactions contemplated herein
for which the Company or the Purchaser shall have any responsibility.

Each of the Vendors,  separately  as to itself,  makes the  representations  and
warranties set forth in section 3.42 to 3.46 inclusive to the Purchaser.

3.42  Formation of the Vendors; Title to the Purchased Shares

Other  than  Feshbach  and  Lynch,  each  of  whom  is  an  individual,  it is a
corporation, partnership or trust duly incorporated or otherwise formed, validly
existing  and in  good  standing  under  the  laws  of the  jurisdiction  of its
formation.  It or he is  the  beneficial  owner,  and  will  at  Closing  be the
beneficial and  registered  owner,  of the number of Purchased  Shares set forth
opposite its name in Schedule 1.1(c) free and clear of all  Encumbrances  (other
than the rights of the Purchaser under this  Agreement).  As at the date of this
Agreement,  it or he is the beneficial  owner of the principal amount of the Old
Debentures  set forth  opposite  its name in Schedule  1.1(c).  It or he will at
Closing be the beneficial and  registered  owner of the principal  amount of the
Debentures in Canadian  dollars  equivalent to the amount set forth opposite its
or his name in Schedule  1.1(c)  plus  interest  accrued  but unpaid  thereon as
contemplated  in  the  definition  of  "Debentures",   free  and  clear  of  all
Encumbrances  (other than the rights of the Purchaser  under this Agreement) and
the Old  Debentures  held by it or him will have been  canceled  and the Company
will have no liability,  obligation or duty with respect thereto.  It or he will
deliver to the Purchaser on Closing good,  valid and marketable  title to all of
such Purchased  Shares free and clear of all  Encumbrances and has the exclusive
right to dispose of such  Purchased  Shares  provided  in this  Agreement.  Such
disposition will not violate, contravene,  breach or offend against or result in
any  default  under  any  indenture,  mortgage,  lease,  agreement,  obligation,
instrument,  charter or by-law provision,  statute, regulation, order, judgment,
decree, licence, permit or law to which it or he is party or subject or by which
it is bound or affected (other than any such violation,  contravention,  breach,
offence or default which will not have a Material Adverse Effect).




                                       
<PAGE>

3.43  Due Authorization

It or he has  all  necessary  power  (corporate  or  otherwise),  authority  and
capacity to enter into this  Agreement  and to carry out its  obligations  under
this   Agreement.   The  execution  and  delivery  of  this  Agreement  and  the
consummation of the  transactions  contemplated in this Agreement have been duly
authorized by all necessary action (corporate or otherwise) on its or his part.

3.44  Enforceability of Obligations

This Agreement  constitutes its or his valid and binding obligation  enforceable
against it in accordance with the terms of this Agreement,asubject,  however, to
limitations  with  respect  to  enforcement  imposed by law in  connection  with
bankruptcy or similar proceedings and to the extent that equitable remedies such
as specific  performance  and injunction are in the discretion of the court from
which they are sought.

3.45  Consents, Approvals or Authorizations

Except for the AEUB  Approval or as otherwise  obtained,  no consent,  approval,
order or authorization of, filing or registration  with, or notification to, any
Governmental Authority or regulatory authority, or consent,  approval,  order or
authorization  of any  Person  (except  those  that  may  not  be  unnecessarily
withheld), is required on its or his behalf in connection with the execution and
delivery  of  this  Agreement  by it  or  the  completion  of  the  transactions
contemplated by this Agreement.

3.46  Finders' Fees

Except for  finder's  fees which are to be  deducted  in  calculating  the Nevis
Proceeds,  it has not incurred  any  liability,  contingent  or  otherwise,  for
brokers' or finders' fees in respect of the transactions contemplated herein for
which the Company or the Purchaser shall have any responsibility.

Without limiting Section 1.3:

(a)   except only to the extent of the representations and
warranties set forth in this Agreement:

      (i) the Company and the Vendors  negate and disclaim  representations  and
warranties  at any time or times  made  orally or in  writing  and  directly  or
indirectly concerning the transactions provided for in this Agreement, including
those in any  information  or advice  provided to the  Purchaser by any officer,
shareholder,  director,  employee,  agent,  consultant or  representative of the
Company or the Vendors (including Jefferies); and

(ii) the Company and the Vendors make no representation  or warranty,  and shall
have no liability,  directly or indirectly in respect of the Company's  title in

                                       
<PAGE>




or to or Encumbrances  against any Petroleum and Natural Gas Rights or as to the
Environmental  condition of the Assets, the Environment,  Environmental matters,
the effect of any of the Assets on the Environment,  Environmental  Approvals or
Environmental Laws; and

(b)  notwithstanding  anything to the contrary in Article 3 or elsewhere in this
Agreement,  the Vendors make no representations  or warranties  whatsoever other
than those  expressly  set forth in  Sections  3.42 to 3.46  inclusive,  and the
Vendors and the Company make no  representations or warranties and shall have no
liability  directly or indirectly in respect of or which  contemplate  or relate
to:

      (i)   the quantity, quality, recoverability or deliverability
of reserves of Petroleum Substances attributable to the Petroleum
and Natural Gas Rights;

      (ii)  any geological or other interpretations or economic
evaluations of any Petroleum and Natural Gas Rights;

      (iii)       the condition, fitness or merchantability of any
of the Assets;

      (iv) the value of any  Petroleum  and  Natural Gas  Rights,  estimates  of
prices  or future  cash  flows  arising  from the sale of  Petroleum  Substances
attributable  to any  Petroleum  and  Natural  Gas  Rights,  estimates  of other
revenues   attributable   to  the  Petroleum  and  Natural  Gas  Rights  or  the
availability or continued  availability of transportation to sell such Petroleum
Substances.

The Purchaser  acknowledges  and  confirms,  without  diminishing  the force and
effect  of  the  express  representations  and  warranties  herein  and  in  the
Schedules, that:

(c) it has inspected, or has been given a reasonable and adequate opportunity to
inspect, the Assets and their physical and Environmental condition and performed
its own due  diligence  and has not relied  directly or  indirectly on any data,
information  or advice  from or on behalf of the  Company or the Vendors in that
regard in connection with the transactions provided for in this Agreement; and

(d) in agreeing to enter into and complete the transactions provided for in this
Agreement,  and in completing such  transactions,  it has relied solely upon its
own engineering and other evaluations, assessments, inspections and projections,
without any direct or indirect involvement of or on behalf of the Company or the
Vendors.

UCC  DISCLAIMER:  EXCEPT FOR THE  REPRESENTATIONS  AND  WARRANTIES  PROVIDED  IN
ARTICLE 3, THE  COMPANY AND THE  VENDORS  MAKE NO  WARRANTY  OR  REPRESENTATION,
EXPRESS,  STATUTORY  OR  IMPLIED,  AS TO  (I)  THE  ACCURACY,  COMPLETENESS,  OR
MATERIALITY OF ANY DATA,  INFORMATION  OR RECORDS  FURNISHED TO THE PURCHASER IN

                                      
<PAGE>



CONNECTION  WITH THE  ASSETS;  (II) THE  QUANTITY,  QUALITY,  RECOVERABILITY  OR
DELIVERABILITY OF RESERVES OF PETROLEUM SUBSTANCES ATTRIBUTABLE TO THE PETROLEUM
AND NATURAL GAS RIGHTS; (III) THE ABILITY OF THE ASSETS TO PRODUCE HYDROCARBONS,
INCLUDING WITHOUT  LIMITATION  PRODUCTION RATES,  DECLINE RATES AND RECOMPLETION
OPPORTUNITIES;  (IV) GAS BALANCING  INFORMATION,  ALLOWABLES OR OTHER REGULATORY
MATTERS,  (V) THE PRESENT OR FUTURE VALUE OF THE  ANTICIPATED  INCOME,  COSTS OF
PROFITS,  IF ANY,  TO BE  DERIVED  FROM THE  ASSETS,  OR (VI) THE  ENVIRONMENTAL
CONDITION  OF THE  ASSETS.  ANY AND  ALL  DATA,  INFORMATION  OR  OTHER  RECORDS
FURNISHED  BY THE  COMPANY OR THE VENDORS ARE  PROVIDED  TO THE  PURCHASER  AS A
CONVENIENCE  AND  THE  PURCHASER'S  RELIANCE  ON OR USE OF  THE  SAME  IS AT THE
PURCHASER'S SOLE RISK.


ARTICLE 4
REPRESENTATIONS AND WARRANTIES OF ABRAXAS AND THE PURCHASER

Abraxas  and  the  Purchaser  hereby  make  the  following  representations  and
warranties to the Company and the Vendors.

4.1   Incorporation

Abraxas and the Purchaser are corporations duly incorporated, organized, validly
existing and in good standing  under the laws of the State of Nevada and Canada,
respectively.

4.2   Due Authorization

Abraxas and the Purchaser  have all  necessary  corporate  power,  authority and
capacity to enter into this Agreement and to carry out their  obligations  under
this respective Agreement.  The execution and delivery of this Agreement and the
consummation of the  transactions  contemplated in this Agreement have been duly
authorized  by all  necessary  corporate  action on the part of Abraxas  and the
Purchaser.

4.3   Enforceability of Obligations

This  Agreement  constitutes  a valid and binding  obligation of Abraxas and the
Purchaser  enforceable  against Abraxas and the Purchaser in accordance with the
terms of this  Agreement,  subject,  however,  to  limitations  with  respect to
enforcement  imposed by law in connection with bankruptcy or similar proceedings
and to the extent  that  equitable  remedies  such as specific  performance  and
injunction are in the discretion of the court from which they are sought.

4.4   Absence of Conflicting Agreements

The execution and delivery of this Agreement does not, and the  consummation  of
the transactions  contemplated  hereby and compliance with the provisions hereof
will not constitute a Violation by Abraxas or the Purchaser under or pursuant to
any provision of:

                                       
<PAGE>





(a) the  Articles of  Incorporation,  as amended,  or  By-laws,  as amended,  of
Abraxas or the  Purchaser (a true and  complete  copy of each of which as of the
date hereof has been delivered to the Representative);

(b) any contract,  agreement,  loan or credit agreement,  note, bond, debenture,
mortgage,   indenture,   lease,   employee  benefit  plan  or  other  agreement,
obligation,  instrument, permit, concession, franchise, or license applicable to
Abraxas or the  Purchaser (a true and  complete  copy of each of which as of the
date hereof has been delivered to the Representative); or

(c) any judgment,  injunction,  order, decree, statute, law, ordinance,  rule or
regulation  applicable to Abraxas or the Purchaser or their respective  property
or assets.

4.5   Consents, Approvals or Authorizations

Except  in  connection  with  the  AEUB  Approval,   no  consent,   approval  or
authorization  of,  filing  or  registration   with,  or  notification  to,  any
governmental or regulatory  authority or consent,  approval or  authorization of
any Person, is required on behalf of Abraxas or the Purchaser in connection with
the execution and delivery of this  Agreement by it or the  consummation  of the
transactions contemplated by this Agreement.

4.6   Finders' Fees

Neither  Abraxas nor the  Purchaser  has incurred any  liability,  contingent or
otherwise,  for  brokers'  or  finders'  fees  in  respect  of the  transactions
contemplated  herein  for  which  the  Company  or the  Vendors  shall  have any
responsibility.

4.7   Independent Evaluation

Abraxas and the Purchaser are experienced and knowledgeable investors in the oil
and gas business. Abraxas and the Purchaser have been advised by and have relied
solely on their own expertise and legal,  tax,  reservoir  engineering and other
professional counsel concerning this transaction,  the Securities and the Assets
and the value  thereof,  as  determined  by their  examination  of the Company's
records and inspection of the Company,  the  Securities and the Assets,  and the
representations, warranties and covenants made by the Company and the Vendors in
this Agreement.

4.8   Eligibility

The Purchaser is eligible under the Regulations to own the Purchased Shares.


                                       
<PAGE>



4.9   Securities Laws

The Purchaser is acquiring the Purchased Shares as principal for its own account
for the purpose of  investment  and not with a view to or for sale in connection
with any distribution thereof


ARTICLE 5
SURVIVAL

5.1   Nature and Survival

(a) Subject to the limitations set forth in Section 5.1(b), the representations,
warranties, indemnities and covenants contained in Sections 2.3, 8.1 and 8.4 and
Articles 1, 3, 4, 9, 10, 11 and 13 of this Agreement  shall survive the Closing,
the execution and delivery of any transfer  instruments  and other  documents of
title  to the  Purchased  Shares  and any  other  agreements,  certificates  and
indemnities under this Agreement and the payment of the Purchase Price.

(b) The representations and warranties concerning tax matters set out in Section
3.9, the  representation  and warranty set forth in Section 3.29,  insofar as it
concerns Royalties (herein "Alberta Crown Royalties") payable to Her Majesty the
Queen in right of the Province of Alberta,  and the  provisions  of Section 9.6,
the covenants,  agreements and indemnities related thereto and the covenants set
forth in Article 10 shall  survive for a period of 1 year from the Closing Date.
All other representations,  warranties,  indemnities and covenants shall survive
for a period of 6 months from the Closing Date. If no Contractual Claim has been
made under this Agreement in accordance with the applicable provision in Section
9.1, prior to the expiry of the applicable survival period provided for, against
a Party for any  incorrectness or breach of any  representation or warranty made
in, or breach of any covenant, agreement or indemnity in, this Agreement by such
Party,  such Party  shall  have no further  liability  under this  Agreement  or
otherwise with respect to such  representation  or warranty.  If Closing occurs,
none of the  Parties  shall  have any claim or remedy in  respect  of any of the
representations,  warranties,  covenants and indemnities set forth herein or any
agreement,  certificate or document delivered pursuant hereto except as provided
in Article 9.

(c) The  provisions of Sections 9.1, 9.2, 9.3 and 9.6 shall survive  Closing for
so long as any  Contractual  Claims  made prior to the expiry of the  applicable
survival period remain unresolved.

5.2   Reliance

No Party shall be entitled to maintain an action after Closing  against  another
Party  in  respect  of any  incorrectness  or  breach  by the  other  Party of a

                                       
<PAGE>




representation  or warranty in  Articlea3 or 4, as the case may be, if the Party
asserting  the claim was  actually  aware of the  incorrectness  or breach at or
prior to Closing or if a Purchase Price  adjustment was made pursuant to Section
2.9 in respect of the particular  incorrectness or breach of a representation or
warranty.


ARTICLE 6
PURCHASER'S CONDITIONS PRECEDENT

The obligation of the Purchaser to consummate the  transactions  contemplated by
this Agreement shall be subject to the  satisfaction  of, or compliance with, or
waiver in writing by the Purchaser of, on or prior to the Closing Time,  each of
the following conditions precedent (each of which is acknowledged to be inserted
for the  exclusive  benefit of the Purchaser and may be waived by it in whole or
in part in writing).

6.1   Truth and Accuracy of Representations of Company at the
Closing Time

The  representations  and  warranties  of the Vendors and the Company made in or
pursuant to this  Agreement  shall be  Substantially  true and correct as of the
Closing  Time and with the same  force  and  effect  as if made at and as of the
Closing Time (except as such  representations  and warranties may be affected by
the occurrence of events or transactions expressly contemplated and permitted by
this Agreement or as consented to in writing by the Purchaser) and the Purchaser
shall  have  received  a  certificate  of the  Company  to the  effect  that its
representations  and  warranties  are true and  correct as of the  Closing  Time
except as aforesaid in this Section 6.1 and except to the extent that a Purchase
Price adjustment has been made as contemplated in Section 2.9.

6.2   Performance of Obligations

The Vendors and the Company  shall have  performed or complied with all of their
obligations,  covenants and agreements under this Agreement. The Purchaser shall
have received a  certificate  of the Company to the effect that it has performed
or complied with all of its  obligations,  covenants and  agreements  under this
Agreement.

6.3   Receipt of Closing Documentation

All  documentation  relating to the due authorization and completion of the sale
and purchase of the  Purchased  Shares and the  termination  of the Option under
this Agreement and all actions and proceedings  taken on or prior to the Closing
in  connection  with the  performance  by the  Company  and the Vendors of their
respective  obligations  under  this  Agreement  shall  be  satisfactory  to the
Purchaser  (acting  reasonably)  and the Purchaser shall have received copies of
all such  documentation or other evidence as it may reasonably  request in order

                                      
<PAGE>




to establish the consummation of the transactions contemplated by this Agreement
and  the  taking  of  all  corporate  proceedings  in  connection  therewith  in
compliance with these  conditions,  in form (as to certification  and otherwise)
and substance satisfactory to the Purchaser acting reasonably.

6.4   Consents, Authorizations and Registrations

All material consents,  approvals,  orders,  authorizations and confirmations of
any Persons and Governmental  Authorities  including without limitation the AEUB
Approval (or  registrations,  declarations,  filings or recordings with any such
authorities) which are reasonably  required in connection with the completion of
the  transactions  contemplated  by  this  Agreement  or the  execution  of this
Agreement shall have been obtained on or before the Closing Time.

6.5   [Intentionally Omitted]


6.6   Agreements Terminated

The Option Agreement,  the Investors'  Agreements and the Management  Agreements
shall  have  been  terminated  and all sums due and owing  under the  Investors'
Agreements and the Management Agreements shall have been paid in full.

6.7   Closing Opinion

The Purchaser  shall have received an opinion from BJV and an opinion from legal
counsel for each of the Vendors who is not an individual, each dated the Closing
Date,  substantially  in  the  forms  attached  as  Schedule  6.7  (a)  and  (b)
respectively.

6.8   Title Opinion Update

The Purchaser  shall have  received  from BJV an opinion  updating the BJV Title
Opinion in the form of Schedule 6.8.

6.9   Financing

The Purchaser shall have obtained financing on terms and conditions satisfactory
to the Purchaser, in the Purchaser's sole discretion, to consummate the purchase
and sale of the Purchased  Shares and  termination of the Option as contemplated
hereby.

6.10  Officers and Directors

All of the officers and directors of the Company  shall have resigned  effective
as of the Closing Date and shall have  delivered  releases to the Company in the
form of Schedule 6.10.


                                      
<PAGE>

6.11  Escrow Agreement

The Vendors,  the  Representative  and the Escrow Agent shall have  executed and
delivered the Escrow Agreement.

6.12  Sale of Excluded Assets

The sale of the Excluded  Assets to Morrison and the  assumption of the Excluded
Liabilities  by  Morrison  shall  have  been  completed  pursuant  to the  Nevis
Agreement.

6.13  Termination Agreements and Transition Agreement

The Termination  Agreements and all of the releases provided for therein and the
Transition Agreement shall have been executed and delivered.

6.14  Material Adverse Damage

From  August  1, 1996  until the  Closing  Date,  there  shall not have been any
physical damage to any of the Petroleum and Natural Gas Rights or the Tangibles:

(a)   the uninsured portions of the costs of repair of which will
exceed $3 Million; or

(b) which is insured and not  substantially  repaired  prior to the Closing Date
but the cost of repair of which will exceed $3 Million.

6.15  No Litigation

No action or proceeding  shall have been instituted or, to the best knowledge of
the Company, threatened before a court or other government body or by any public
authority to restrain or prohibit,  or otherwise affect, any of the transactions
contemplated  hereby,  and the Company  shall have  delivered to the Purchaser a
certificate dated as of the Closing Date to that effect.

6.16  Bank Accounts

The  Company  shall have  executed  and  delivered  to the  Purchaser  documents
evidencing  the change of signing  authorities,  in respect of the bank accounts
listed in  Schedule  3.23 to  individuals  identified  by the  Purchaser  to the
Representative not later than three Business Days prior to Closing.

6.17
Debentures

The Debentures  will have been validly issued in full and complete  satisfaction
of all of the issued and  outstanding  Old Debentures  pursuant to the Debenture
Prepayment  Agreement  and the  Debentures  shall  have  been  delivered  to the
Representative  in  accordance  with  Section  8.5.  If  any  of  the  foregoing

                                      
<PAGE>




conditions  in this  Article,  which are for the sole benefit of the  Purchaser,
have not been  fulfilled and  performed by Closing,  the Purchaser may terminate
this Agreement by notice in writing to the Company and the Vendors. However, the
Purchaser may in writing waive  compliance  with any  condition,  in whole or in
part, if it sees fit to do so, without prejudice to its rights of termination in
the event of nonfulfillment  of any other condition,  in whole or in part, or to
its rights to recover  damages for the breach of any  representation,  warranty,
covenant or condition contained in this Agreement,  whether or not it terminates
this Agreement.



ARTICLE 7
VENDORS' CONDITIONS PRECEDENT

The obligation of the Vendors to consummate  the  transactions  contemplated  by
this Agreement shall be subject to the  satisfaction  of or compliance  with, or
waiver in writing by all of the  Vendors  of, on or prior to the  Closing  Time,
each of the following  conditions precedent (each of which is acknowledged to be
inserted for the  exclusive  benefit of the Vendors and may be waived by them in
whole or in part).

7.1   Truth and Accuracy of Representations of Purchaser at
Closing Time

The  representations  and  warranties  of Abraxas and the  Purchaser  made in or
pursuant to this  Agreement  shall be  Substantially  true and correct as of the
Closing  Time and with the same  force  and  effect  is if made at and as of the
Closing Time (except as such  representations  and warranties may be affected by
the occurrence of events or transactions expressly contemplated and permitted by
this  Agreement  or as  consented  to in writing by the Vendors) and the Vendors
shall have received a certificate of Abraxas and the Purchaser to that effect.

7.2   Performance of Obligations

Abraxas and the  Purchaser  shall have  performed or complied  with all of their
obligations,  covenants and agreements under this Agreement. The Vendors and the
Company shall have  received a certificate  of Abraxas and the Purchaser to that
effect.

7.3   Receipt of Closing Documentation

All  documentation  relating to the due authorization and completion of the sale
and purchase of the  Purchased  Shares and the  termination  of the Option under
this Agreement and all actions and proceedings  taken on or prior to the Closing
in connection  with the  performance by the Purchaser of its  obligations  under
this Agreement shall be  satisfactory to the Vendor (acting  reasonably) and the
Vendor shall have received copies of all such documentation or other evidence as

                                       
<PAGE>




it may  reasonably  request  in  order  to  establish  the  consummation  of the
transactions  contemplated  by this  Agreement  and the taking of all  corporate
proceedings in connection therewith in compliance with these conditions, in form
(as to certification  and otherwise) and substance  satisfactory to the Vendors,
acting reasonably.

7.4   Consents, Authorizations and Registrations

All material consents,  approvals,  orders,  authorizations and confirmations of
any  Persons  and  Governmental  Authorities  including  the AEUB  Approval  (or
registrations,  declarations,  filing or recordings  with any such  authorities)
which  are  reasonably  required  in  connection  with  the  completion  of  the
transactions  contemplated by this Agreement or the execution of this Agreement,
shall have been obtained on or before the Closing Time.

7.5   Closing Opinion

The Vendors  shall have  received an opinion  from BDP and an opinion from Cox &
Smith,  Incorporated,  each dated the Closing Date,  substantially  in the forms
attached as Schedule 7.5(a) and (b) respectively.

7.6   Release of Directors and Officers

The  Purchaser  and the  Company  shall have  delivered  releases in the form of
Schedule  7.6 to and in respect of each of the  Company's  current  officers and
directors.

7.7   Escrow Agreement

The Escrow Agent and the Purchaser  shall have executed and delivered the Escrow
Agreement.

7.8   Representations and Warranties

The  representations  and  warranties  of the Vendors and the Company made in or
pursuant to this  Agreement  shall be  Substantially  true and correct as of the
Closing  Time and with the same  force and  effect as if made as of the  Closing
Time  (except as such  representations  and  warranties  may be  affected by the
occurrence of events or  transactions  expressly  contemplated  and permitted by
this Agreement or as consented to in writing by the Purchaser).

7.9   No Litigation

No action or proceeding  shall have been instituted or, to the best knowledge of
the Company, threatened before a court or other government body or by any public
authority to restrain or prohibit any of the transactions contemplated hereby.


                                       
<PAGE>
7.10  Termination Agreements and Transition Agreement

The  Termination  Agreements  and the  releases  provided  for  therein  and the
Transition Agreement shall have been executed and delivered.

7.11  Material Adverse Damage

From  August  1, 1996  until the  Closing  Date,  there  shall not have been any
physical damage to any of the Petroleum and Natural Gas Rights or the Tangibles,
the uninsured portions of the cost of repair of which will exceed $3 Million.

If any of the  foregoing  conditions  in this  Article,  which  are for the sole
benefit of the Vendors,  have not been  fulfilled  or performed by Closing,  the
Vendors may  terminate  this  Agreement  by notice in writing to the  Purchaser.
However,  the Vendors may in writing waive  compliance  with any  condition,  in
whole or in part, if they see fit to do so,  without  prejudice to its rights of
termination in the event of nonfulfillment of any other condition in whole or in
part or to its rights to recover  damages for the breach of any  representation,
warranty,  covenant or condition contained in this Agreement,  whether or not it
terminates this Agreement.


ARTICLE 8
INTERIM PERIOD

8.1   Conduct of Business Prior to Closing

(a)   During the Interim Period, the Company shall:

      (i) except as otherwise expressly permitted by this Agreement, conduct the
Company's  businesses  in the ordinary and usual course and in  accordance  with
good industry practice, and shall not:

                  (A) without the prior written  consent of the Purchaser,  make
or commit to any single  expenditure in excess of $250,000  (except in the event
of a catastrophe or other event endangering life or property); or

                  (B) enter into any  transaction  which if effected  before the
date  of  this  Agreement  would  constitute  or  result  in  a  breach  of  the
representations, warranties or agreements contained in this Agreement;

      (ii)  continue in full force and effect all existing policies
or insurance presently maintained or caused to be maintained by
the Company; and

      (iii)       comply with all laws affecting the operation of
its business and pay all required Taxes and installments of
Taxes;


                                       
<PAGE>



      (iv) to the extent that the nature of its interests in the Assets permits,
maintain and keep the Assets in good condition and working order, preserving the
Assets in full force and effect and  performing  all  covenants  and  conditions
imposed upon the Company  including,  but not limited to,  payment of royalties,
delay  rentals,  shut-in gas royalties and any and all other  required  payments
(except  those held in suspense  in good faith by the Company for a  justifiable
purpose);

      (v) to the extent that the nature of its interests in the Assets  permits,
operate or cause to be operated the Wells or any unit of which any of the Assets
are a part in a good and workmanlike  manner in accordance with the terms of the
respective applicable operating agreements and good industry practices;

      (vi)  timely perform all of its obligations under the
Material Contracts;

      (vii) exercise due diligence in safeguarding  and  maintaining  secure and
confidential all geological and geophysical maps,  confidential  reports and all
other confidential data in its possession relating in any way to the Assets;

      (viii)      maintain the Company's Articles of Incorporation
and By-Laws in their form on the date of this Agreement,

      (ix) maintain the compensation payable or to become payable by the Company
to any officer, employee or agent at their levels on the date of this Agreement,

      (x) except for the sale of the  Excluded  Assets,  preserve  the  business
organization of the Company,  keep available to Purchaser the Company's officers
and agents and preserve its present business relations with suppliers, customers
and others  and shall not commit any act or any way assist  others to commit any
act which will injure the Company or the business of the Company.

and except as otherwise provided or disclosed in this Agreement the Company will
not,  without  the  Purchaser's  prior  written  consent,  which  shall  not  be
unreasonably withheld or delayed:

      (xi)  surrender or abandon any of the Assets or amend any
agreement or contract relating to the Assets; or

      (xii) sell,  transfer or dispose of, or grant a security interest in or in
respect of, all or any part of or any  interest  in the  Assets,  except for the
sale (in the ordinary  course of business  pursuant to contract,  terminable  on
notice of not more  than (60 days) of  Petroleum  Substances  produced  from the
Lands.

(xiii) make any bonus,  pension,  retirement or insurance payment or arrangement
to or with any such persons except those that may have already been accrued, and
bonus and insurance  payments in the ordinary  course of business and consistent

                                       
<PAGE>




with the past practice of the Company;

      (xiv)       issue, sell or otherwise dispose of its capital
stock or any right or option to acquire any shares of its capital
stock;

      (xv) declare or pay any dividend or make any other distribution or payment
in respect of its capital stock or redeeming,  purchasing or otherwise acquiring
or agreeing to redeem, purchase or acquire any of its capital stock;

      (xvi)       create, incur, or assume any long-term or
short-term debt whether for money borrowed or otherwise;

      (xvii)      assume, guarantee, endorse or otherwise become
liable or responsible for the obligation of any other Person;

      (xviii)  make  any  loans,   advances  or  capital  contributions  to,  or
investments  in, any other  Person,  prepay any interest  payable  under the Old
Debentures or the Debentures  (other than to the extent that the issuance of the
Debentures  constitutes a prepayment of interest  under the Old  Debentures)  or
distribute any insurance proceeds or the Nevis Proceeds to any shareholders;

      (xix)       make any change affecting any bank, safe deposit
or power of attorney arrangements of the Company;

      (xx)  waive, compromise or settle any material right or claim
of the Company;

      (xxi)       enter into any forward, future, swap or hedging
contract that burdens the Assets or production therefrom; or

      (xxii)      amend or modify any of the Material Contracts, the
Option Agreement, the Nevis Agreement, the Old Debentures, the
Debentures or the Termination Agreements;

The  Purchaser  will  respond to all written  requests  for  consent  under this
Section  8.1(a) with  reasonable  promptness,  and within such  reasonable  time
period as the Company or the Vendors may specify to enable a timely  reply to be
given to any third party. If the Purchaser does not respond within any such time
period specified by the Company or Vendors, the Company and the Vendors shall be
entitled to carry out the action described in the request, so long as the action
is consistent with proper business practices.

(b) The Purchaser  acknowledges  that an operation may be proposed pursuant to a
facilities,  unit,  unit  operating  or other  agreement  and may  proceed  if a
majority,  but not  all,  of the  owners  of the  particular  facility,  unit or
property  vote in  favour  thereof,  and  that the  owners  voting  against  the
operation will nevertheless be obliged to pay for their respective proportionate
shares of the costs of the  operation.  When the  Company  is  required  by this

                                       
 <PAGE>




Section to obtain the written consent of the Purchaser in respect of any capital
expenditure  which is subject to such a vote, the Company will vote in favour of
the particular  expenditure  unless the Purchaser  instructs the Company to vote
against it. If the  particular  expenditure is approved of and proceeded with in
accordance with the applicable  agreement  notwithstanding  that the Company may
have  voted  against  the   particular   expenditure,   the   Purchaser   shall,
notwithstanding  its  refusal to consent to the  expenditure,  be deemed to have
consented to it.

(c) If, having been given a written  request for consent as  contemplated in the
last paragraph of Section 8.1(a) and a reasonable  time period to respond to the
said  request  having  regard to the time period  within  which a reply is to be
given to the relevant  third party,  the  Purchaser  fails or refuses to consent
pursuant  to this  Section  8.1 to an  expenditure  necessary  to  preserve  the
existence of any of the Leases and, as a  consequence,  any of the Leases or the
interest of the Company  therein is terminated or  surrendered or deemed to have
been  terminated  or  surrendered,  the  Purchase  Price shall not be reduced on
account of the  termination or surrender nor shall the termination or surrender,
without  more,  constitute  a  breach  or  failure  of the  representations  and
warranties of the Company relating thereto or of the Company's title thereto.

(d) The Company shall give prompt  written notice to the Purchaser of any notice
or claim,  written  or oral,  of  default  or breach by the  Company,  or of any
termination or cancellation  (or threat of any of the same,  whether disputed or
denied by the Company)  received or given by the Vendors or the Company prior to
Closing  under any  instrument  or agreement  affecting  the Assets to which the
Company is a party or by which it or any of the Assets is bound.

(e) Except with  respect to the  transactions  contemplated  by this  Agreement,
during the period  from the date of this  Agreement  to the  Closing  Date,  the
Vendors shall not take, and shall cause the Company to refrain from taking,  any
action to, directly or indirectly,  encourage, initiate or engage in discussions
or  negotiations  with, or provide any  information  to, any Person,  other than
Purchaser,  concerning any purchase of the Securities,  or any part thereof,  or
any  merger,  sale of all or  substantially  all of the assets of the Company or
similar transaction involving the Company.

(f) Except  with  respect to the  transaction  contemplated  by this  Agreement,
during the period  from the date of this  Agreement  to the  Closing  Date,  the
Vendors shall not sell, transfer, dispose of, or grant a security interest in or
in respect of, all or any part of the  Purchased  Shares,  the  Option,  the Old
Debentures or the Debentures.



                                      
<PAGE>


8.2   Access for Investigation

(a) For the purpose of  permitting  the Purchaser to  investigate  the business,
properties and assets of the Company, but subject to confidentiality obligations
of the Company or the Vendors to other  Persons,  the Company  shall  permit the
Purchaser  and  its   representatives,   during  the  Interim  Period,   without
interference  to the ordinary  conduct of the  business of the Company,  to have
reasonable  access during normal business hours and on reasonable  notice to the
premises and to all the books,  accounts,  records and other data of the Company
within the  possession  or control of the Company.  The Company shall furnish to
the  Purchaser  such  financial and operating  data and other  information  with
respect to the business,  properties  and assets of the Company as the Purchaser
shall from time to time reasonably  request.  The right of the Purchaser to have
access to the Assets shall be subject to any contractual  restrictions  thereon.
The Company  shall  cooperate  with the  Purchaser in  attempting to secure such
access from other Persons.  The Purchaser  shall repair any damage to the Assets
resulting from its inspection  thereof and shall indemnify and save harmless the
Company and the Vendors from and against any Claims arising as the result of the
Purchaser conducting such inspection.

(b) In  particular,  without  limiting the  generality  of Section  8.2(a),  the
Company shall make the Material  Contracts,  the Leases and all  agreements  and
other  documents  and   correspondence,   including  title  opinions  previously
prepared,  relating to title to the Assets, and all financial,  tax, accounting,
well, production and operating data and records of the Company, available to the
Purchaser  and its  representatives  at the  offices  of the  Company  for  such
inspection and review as the Purchaser reasonably requires.

8.3   Actions to Satisfy Closing Conditions

Each of the Parties  agrees to take all such  actions as are within its power or
control,  and to use its best efforts,  to cause other actions to be taken which
are not within its power or control, so as to ensure compliance with each of the
conditions  and  covenants  set forth in  Articles  6, 7 and 8 which are for the
benefit of any other Party.

8.4   Waiver of Conditions in Nevis Agreement

The Company  shall not waive any of the  conditions  precedent of the Company to
closing set forth in Article 7 of the Nevis Agreement.

8.5   Delivery of Debentures to the Representative

Prior  to  the  Closing,  the  Vendors  shall  deliver  the  Debentures  to  the
Representative,  to be held in trust until  payment of the principal and accrued
but unpaid  interest has been made in  accordance  with section 9.7. The Vendors
and the  Representative  shall not demand payment of the Debentures earlier than
the Business Day immediately following the Closing Date.

                                     
<PAGE>






ARTICLE 9
POST-CLOSING MATTERS

9.1   Claims

(a) If,  at any  time,  a Party or  Parties  (herein,  whether  one or  more,  a
"Notifying  Party")  believes  that it has  incurred or suffered or that it will
incur or suffer  liabilities,  losses or costs (herein  collectively  "Damages")
because  of the  incorrectness  or breach of a  representation  or  warranty  in
Article 3 or 4 (whether  as of the date  hereof or at the  Closing  Time) or the
certificates delivered by the Company pursuant to Section 6.1 and 6.2 hereof, or
the breach of any covenant set forth in Section  2.3(d),  8.1,  8.4, 8.5, 9.3 or
9.6 or this  Section  9.1 or  Articles  10, 11 or 13, or any  amount of Taxes or
Alberta  Crown   Royalties   finally   established   by  a  Court  of  competent
jurisdiction,  or agreed by the  Representative  to be payable by the Company as
the result of an Assessment as  contemplated  in Section 9.6, or any such amount
paid in good faith by the Company or the  Purchaser  (without the consent of the
Representative) with respect to an Assessment as contemplated in Sections 9.6(b)
and (d), or any claim by Jefferies for indemnification pursuant to the Jefferies
Indemnification Letter as the case may be, or the fraud of the Company or any of
the  Vendors,  as the  result of which it has an actual or  potential  claim for
Damages or amounts or that for any other reason it has any claim hereunder (each
such claim being  referred to as a  "Contractual  Claim"),  the Notifying  Party
shall  forthwith give written  notice  (herein the "Claim  Notice") to the other
Parties (herein,  whether one or more, the "Receiving  Party") and to the Escrow
Agent of the matter giving rise to the Contractual Claim. The notification shall
specify in reasonable detail the subject matter of the Contractual Claim, to the
extent then known to the  Notifying  Party.  The  Parties  agree to deal in good
faith in the settlement or resolution of any Contractual Claim.

(b) Upon notice to the Notifying  Party within 10 Business Days after receipt of
a Claim Notice,  the Receiving Party shall have the right, in good faith, at its
own expense (not to be paid from the Escrow  Account) and  employing  counsel of
its own choice, to contest and assume the defence of any Contractual Claim which
may result  from a Claim made by a third  party.  In such event,  the  Notifying
Party shall have the right to retain its own  counsel but the fees and  expenses
of such counsel shall be at the expense of the Notifying  Party.  The failure to
give such  notice of intent to defend a  Contractual  Claim shall  constitute  a
waiver of the  Receiving  Party's right to defend such  Contractual  Claim under
this Section  9.1(b) and shall  preclude the Receiving  Party from disputing the
manner in which the  Notifying  Party may in good faith  conduct  the defence of
such Contractual Claim or the reasonableness of any amount paid in good faith by
the Notifying  Party in satisfaction of such  Contractual  Claim.  The Receiving

                                       
<PAGE>




Party shall not compromise or settle any  Contractual  Claim without the consent
of the Notifying Party, not to be unreasonably withheld.

(c) The  failure  by a Party to give a Claim  Notice to the other  Parties  with
respect  to any  Contractual  Claim  shall  relieve  the other  Parties of their
obligations with respect to the particular Contractual Claim, but only if and to
the extent that the other Parties are prejudiced by such failure. The failure by
a Party to give the other  Parties a Claim  Notice with respect to any actual or
potential  Contractual  Claim within the period  applicable by virtue of Section
5.1(b) shall relieve the Parties against whom the particular  Contractual  Claim
is or may be made of any liability with respect to such Contractual Claim.

(d) The Parties  will  cooperate  with each other in  providing  access to their
respective  records in connection with Contractual  Claims.  The Purchaser shall
preserve  such data and other  information  as may  reasonably  be  required  in
connection  with a  Contractual  Claim  until the end of the  limitation  period
applicable by virtue of Section 5.1(b).  The Notifying Party will use reasonable
efforts to make available to the Receiving Party:

      (i) those  Persons who are then  employees of the  Notifying  Party or the
Vendors  whose  assistance,  testimony  or presence is necessary or advisable to
assist the  Receiving  Party to  evaluate  and defend  the  subject  matter of a
Contractual Claim; and

      (ii) all  documents,  records and other  materials  in the  possession  or
control of the Notifying Party and reasonably required by the Receiving Party to
evaluate and defend the subject matter of a Contractual Claim,

and,  subject  to the  other  provisions  of  this  Agreement,  shall  otherwise
cooperate in all reasonable  respects with the Receiving Party in evaluating and
defending the subject matter of Contractual Claims. The Purchaser shall preserve
all  documents,  records  and other  material as may  reasonably  be required in
connection  with the subject matter of a Contractual  Claim,  for so long as the
obligation to indemnify continues in effect.

(e) Notwithstanding  any other provision of this Agreement to the contrary,  the
representation  and  warranty  set forth in Section  3.9(i)  shall be  breached,
untrue or incorrect only if and to the extent that the aggregate of the tax pool
amounts  referred to by  category  in Section  3.9(i)(i)  to (vi)  inclusive  as
finally  determined  is less  than $31  million,  and the  Damages  incurred  or
suffered by the Purchaser shall be deemed to be equal to $0.30 for each $1.00 by
which the aggregate of the said tax pool amounts is less than $31 million.




                                      
<PAGE>

9.2   Escrow Account

(a) Subject to Article 5, the  Purchaser  shall be entitled to recover  from the
Escrow Account the Damages to which it establishes  itself entitled  pursuant to
the terms of the Escrow  Agreement,  in respect of a  Contractual  Claim for the
incorrectness or breach of a  representation  or warranty set forth in Article 3
(whether as of the date hereof or as of the Closing Date),  or the  certificates
of the Company  delivered  pursuant to Sections  6.1 and 6.2 hereof or any other
covenant or agreement  set forth herein or any amount of Taxes or Alberta  Crown
Royalties finally established by a Court of competent jurisdiction, or agreed by
the  Representative  to be payable by the Company as the result of an Assessment
as  contemplated  in Section  9.6,  or any such amount paid in good faith by the
Company  or the  Purchaser  (without  the  consent of the  Representative)  with
respect to an  Assessment  as  contemplated  in Sections  9.6(b) and (d), or any
claim by Jefferies for indemnification pursuant to the Jefferies Indemnification
Letter,  the fraud of the Company or any of the Vendors,  or any other amount to
which it, Abraxas or the Company  establishes  itself to be entitled pursuant to
the Escrow Agreement (herein an "Established  Contractual Claim") as if all such
representations,  warranties,  covenants  and  agreements  were made jointly and
severally  by the  Vendors.  If the Closing  occurs,  the Vendors  shall have no
claims or rights of  indemnification  or  contribution  against the Company with
respect to any Established  Contractual  Claim  whatsoever  hereunder  including
amounts recovered by the Purchaser from the Escrow Account.

(b) Subject to the last sentence of this Section 9.2(b),  the Purchaser shall be
limited to recovery  from the Escrow  Account for recovery in respect of any and
all Established Contractual Claims whatsoever hereunder,  other than pursuant to
Section  2.3(d) or Article  10.  Subject to the last  sentence  of this  Section
9.2(b),  in no event will the  Purchaser  have any claim  whatsoever  under this
Agreement  against  the  Representative,  the  Vendors or the  current or former
employees,  officers or directors of the Company or any of them personally,  nor
will the  Purchaser be entitled to recover  separately or in the  aggregate,  in
respect of all  Established  Contractual  Claims and each of them,  an amount in
excess of the Escrow  Amount.  In no event will the  limitations in this Section
9.2(b) apply to:

      (i)    any Established Contractual Claim based upon:

                  (A)   the fraud of the Company or any of the
Vendors; or

                  (B) the incorrectness or breach of any of the  representations
and warranties set forth in Sections 3.42 to 3.46 inclusive or the breach of any
covenants or agreements set forth in Section 2.3(d),  8.1(f), 8.5 or Article 10;
or

      (ii) any claim,  right,  demand or cause of action  relating to or arising
out of the  incorrectness or breach of any covenant,  representation or warranty

                                      
<PAGE>




in any  agreement  or  document  entered  into or executed by any of the Parties
pursuant to the terms hereof or as contemplated hereby;

            with respect to which the Purchaser or the Vendors,  as the case may
be, shall be entitled to  indemnification  as provided  herein directly from the
other and to such other remedies as may be available at law or in equity.

9.3   Joint Venture Audits

(a) Each  notice  or  enquiry  received  or sent by the  Company,  or  hereafter
received  or sent by the  Company  as a result of any joint  venture  or similar
audit (herein a "Joint Venture Audit")  conducted before or after August 1, 1996
as to expenses  incurred  or  revenues  received in respect of any of the Assets
prior to August 1, 1996 pursuant to an operating agreement is referred to herein
as an "Audit Notice". If an Audit Notice is received or given after Closing, the
Purchaser  shall  within 30 days of the  receipt  or giving of the Audit  Notice
forward a copy of the Audit Notice to the Representative.

(b) If any Audit  Notice is to the effect  that a payment in excess of  $100,000
should be made by or to the Company to or by another  Person,  the Vendors shall
be entitled to have reasonable access during normal business hours to review the
records of the  Company  pertaining  to the  matter,  in order to  evaluate  the
matters  disclosed in the Audit  Notice.  Neither the  Purchaser nor the Company
shall  make a payment  by way of an  adjustment  resulting  from any such  Joint
Venture  Audit,  of expenses or revenues  pertaining  to any period ending on or
prior to August 1,  1996,  without  the  consent  of the  Representative  acting
reasonably,  except  pursuant to the award of a Court or arbitrator.  Subject to
Sections  5.1,  9.1 and 9.2, if the amount of the payment to be made or received
by the  Company,  as the  case  may be,  exceeds  $100,000,  the  Vendors  shall
forthwith reimburse the Company for, or the Purchaser shall cause the Company to
pay to the  Representative  (for immediate  disbursement to the Vendors as their
interests  appear),  as the case may be,  the  amount by which the said  payment
exceeds $100,000.

(c) The Vendors shall have the right at their own expense (not to be paid out of
the Escrow  Account)  and  employing  counsel of their own choice to contest any
Audit  Notice to the effect that a payment in excess of $100,000  should be made
by the Company to another  Person.  In that event,  the Purchaser shall have the
right to retain its own counsel but the fees and expenses of such counsel  shall
be at the expense of the Purchaser.

9.4   Stub Period Returns

(a) The Company  shall cause to be prepared  and filed on a timely basis all Tax
Returns for the Company for the fiscal  period which ends  immediately  prior to
Closing.  The Representative  will have a reasonable  opportunity to review such

                                      
<PAGE>




Tax Return prior to the filing thereof.

(b) The Parties shall cooperate fully with each other and make available to each
other in a timely  fashion such data and other  information as may reasonably be
required for the preparation of the Tax Return referred to in Section 9.4(a) and
shall  preserve  such data and other  information  until the  expiration  of any
applicable limitation period under any applicable law with respect to Taxes.

9.5   Change of Name

The Purchaser  will not use, in the name of the Company or its  successors,  the
term "CGGS" or "CGGS  Canadian  Gas  Gathering  Systems  Inc." or any other term
which is confusingly similar to such term.

9.6   Tax and Royalty Mattersa

(a)  Notwithstanding  any other  provision  set forth in this  Agreement  to the
contrary,  if, at any time, the Purchaser or the Company receives an assessment,
a reassessment,  an indication in writing that an assessment is being considered
or  proposed,  or any  other  notice  in  writing  relating  to an  amount  (the
"Assessment")  of Taxes or Alberta Crown Royalties paid or payable in respect of
any period  ending on or prior to July 31,  1996,  the  Purchaser or the Company
shall deliver to the Representative  within 30 days of receiving the Assessment,
a copy of the Assessment,  together with a statement setting out the obligations
of the Vendors  pursuant to this  Section 9.6 and the Escrow  Agreement,  on the
assumption that the Assessment is valid and binding.

(b) Upon notice given by the  Representative to the Purchaser within 15 Business
Days after receipt by the Representative  from the Purchaser or the Company of a
notice of an Assessment,  the Representative on behalf of the Vendors shall have
the right at its own  expense  (not to be paid out of the  Escrow  Account)  and
employing  counsel of its own choice to contest,  in good faith, any Assessment.
In such event,  the Purchaser shall have the right to retain its own counsel but
the fees and expenses of such counsel shall be at the expense of the  Purchaser.
The  failure  to give  such  notice of intent to  contest  an  Assessment  shall
constitute a waiver of the Vendors' right to contest such Assessment  under this
Section 9.6(b) and shall preclude the Vendors from disputing the manner in which
the  Purchaser or the Company may in good faith  contest such  Assessment or the
reasonableness  of any amount paid in good faith by the Company in  satisfaction
of such  Assessment.  The  Representative  shall not  compromise  or settle  any
Assessment without the consent of the Purchaser, which shall not be unreasonably
withheld.



                                       
<PAGE>


(c) The Purchaser will cooperate with the  Representative,  including  providing
access to its  employees  and to financial  and other records of the Company and
the  Purchaser,  in order to  facilitate  the  filing of Tax  Returns or returns
relating to Alberta Crown  Royalties,  as the case may be, in respect of periods
of time prior to the Closing and the conduct of any disputes  relating  thereto.
The  Purchaser  shall  cause  the  Company  to  preserve  such  data  and  other
information  as may  reasonably be required in  connection  with a Tax Return or
returns relating to Alberta Crown Royalties,  as the case may be, of the Company
for any taxation year or fiscal period ending on or prior to Closing,  until the
end of any applicable limitation period under any applicable law with respect to
Taxes or Alberta Crown Royalties, as the case may be.

(d) Except with the consent of the  Representative,  which  consent shall not be
unreasonably  withheld,  the  Purchaser  shall  not,  and shall not  permit  the
Company,  to  agree  to  any  compromise  or  settlement  with  respect  to  any
Assessment;  provided,  however,  that  notwithstanding  the  foregoing,  if the
Purchaser  or the  Company  determines  in good faith  that the  failure to pay,
compromise or settle an  Assessment  could  adversely  affect the Company or its
business, the Purchaser or Company may pay, compromise or settle such Assessment
and such  action  shall not  impair  or  adversely  affect  the  Purchaser's  or
Company's  right to make such payment the subject of a claim in accordance  with
Sections 9.1, 9.2 and 9.6 hereof.

(e) If a refund of Taxes or Alberta Crown Royalties,  as the case may be (to the
extent not  reflected in the July 31 Balance  Sheet) (the  "Refund") is received
by, or credited to, the account of the Company,  in respect of any fiscal period
ending on or prior to July 31, 1996,  such recipient shall pay the amount of the
Refund to the  Representative,  after deduction of an amount equal to the amount
of Taxes,  if any,  to which the  recipient  would be subject as a result of the
receipt or crediting of such Refund.  The  Representative  shall  forthwith upon
receipt of any such Refund  distribute  same to the Vendors as their  respective
interests appear.

(f) The  Purchaser  undertakes  to inform and to cause the Company to inform the
Representative  of all written  audit  inquiries  received  with  respect to the
representations  and warranties in Section 3.9 within 30 days of receipt thereof
and to provide  the  Representative  with the right to make any  representations
prior to an Assessment.

(g)  References to the "Company" in this Section 9.6 shall include and be deemed
to include successors to such corporations by way of amalgamation, winding-up or
other reorganization of any nature whatsoever.

(h) The  failure  by the  Purchaser  to give to the  Representative  the  notice
required by Section 9.6(a) with, respect to any Claim relating to Tax or Alberta
Crown  Royalty  matters  shall  relieve  the Vendors of their  obligations  with

                                      
<PAGE>




respect to such  Claim  only in the event the  Vendors  are  prejudiced  by such
failure.

(i) Notwithstanding any of the provisions of this Agreement, the Purchaser shall
not be entitled to recover twice for the same Damages or Claim under Section 9.2
in respect  of the breach or  incorrectness  of any of the  representations  and
warranties  set  forth in  Article  3 or in  respect  of any  amount of Taxes or
Alberta Crown Royalties.

9.7   Repayment of Debentures

On the same  Business  Day as the  Representative  makes  written  demand of the
Company, which shall not be made earlier than the Business Day immediately after
Closing,  the  Purchaser  shall cause the Company to repay in full the principal
amount of the Debentures,  plus the interest accrued but unpaid thereon,  to the
Vendors,  as  their  respective   interests  appear.  The  principal  amount  of
Debentures  to be held  by each of the  Vendors  shall  be the  Canadian  dollar
equivalent  of the U.S.  dollar  amounts set forth in the column "Old  Debenture
Principal  (US$)" in Schedule  1.1(c),  plus certain accrued but unpaid interest
thereon,  all  as  contemplated  in  Section  2.1 of  the  Debenture  Prepayment
Agreement.  At the time of such repayment,  the Representative shall deliver all
of the  Debentures  to the  Company,  free and  clear of all  Encumbrances,  for
cancellation. The repayment required under this Section 9.7 shall be made to the
Representative  for  immediate  disbursement  to the Vendors in the  proportions
appearing in column "Percentage of Old Debenture Principal" in Schedule 1.1(c).


ARTICLE 10
CONFIDENTIALITY

10.1  Confidential Information

As used herein,  "Confidential Material" means, with respect to the Company, all
information,  whether oral,  written or otherwise,  and all reports or analyses,
compilations,  studies and other materials prepared, either prior to the Closing
Date or after the Closing Date in respect of any matter  arising  hereunder,  by
the Company or any officer,  director,  employee, agent or representative of the
Company, (in whatever form maintained, whether documentary,  computer storage or
otherwise)  containing,  reflecting  or based  upon,  in  whole or in part,  any
information of the Company.  The term  "Confidential  Material" does not include
information which (i) is or becomes generally available to the public other than
as a result of a disclosure  by any of the Vendors or any  officers,  directors,
employees,  agents or  representatives  of the  Vendors  (collectively,  in this
Article  10,  "Representatives")  or anyone to whom the  Vendors or any of their
Representatives   transmit  any  Confidential  Material  in  violation  of  this
Agreement,  (ii) is or  becomes  known  or  available  to the  Vendors  or their
                                       
<PAGE>




Representatives  on a  non-confidential  basis  from a  source  (other  than the
Company) who is not, to the  knowledge  of the Vendors or their  Representatives
after reasonable  inquiry,  prohibited from  transmitting the information to the
Vendors or their  Representatives  by a contractual,  legal,  fiduciary or other
obligation or (iii) is contained in the Offering Memorandum.


10.2  Obligation

Subject to Section 10.3 or except as required by law, the Confidential  Material
will be kept confidential by the Vendors and the  Representatives  and will not,
without the prior written consent of the Company,  the Purchaser and Abraxas, be
disclosed by the Vendors or their Representatives, in whole or in part, and will
not be used by the Vendors or their Representatives, directly or indirectly, for
any purpose other than in connection with this Agreement.

10.3  Disclosure

In the event that any of the Vendors or their  Representatives or anyone to whom
any of the Vendors or their  Representatives  supply the Confidential  Material,
are  requested or required  (by oral  questions,  interrogatories,  requests for
information or documents,  subpoena,  civil investigative demand, any government
or  governmental  agency or  authority or  otherwise  in  connection  with legal
processes)  to disclose any  Confidential  Material,  such Vendor  agrees (i) to
immediately  notify the Company,  the  Purchaser  and Abraxas of the  existence,
terms and  circumstances  surrounding  such a request  (ii) to consult  with the
Company,  the  Purchaser  and  Abraxas  on the  advisability  of taking  legally
available steps to resist or narrow such request and (iii) if disclosure of such
information  is  required,  to furnish  only that  portion  of the  Confidential
Material which, in the opinion of such Vendor's counsel,  such Vendor is legally
compelled  to disclose  and to  cooperate  with any action by the  Company,  the
Purchaser  and  Abraxas  to  obtain  an  appropriate  protective  order or other
reliable assurance that confidential treatment will be accorded the Confidential
Material (it being  agreed that the Company,  the  Purchaser  and Abraxas  shall
reimburse the Vendor for all reasonable  out-of-pocket  expenses incurred by the
Vendor in connection with such cooperation).

10.4  Remedies

The Vendors  acknowledge and agree that any breach or threatened  breach of this
Article  10 may cause  irreparable  injury to the  Company,  the  Purchaser  and
Abraxas  and that  money  damages  would in that event not  provide an  adequate
remedy to the Company, Purchaser and Abraxas and that the Company, the Purchaser
and Abraxas shall have the right,  without limiting any other remedies available
to them  hereunder,  to have the  provisions  of this  Section  10  specifically
enforced by any court having equity jurisdiction.

                                      
<PAGE>






ARTICLE 11
GENERAL

11.1  Covenant of the Vendors

The Vendors hereby engage  Feshbach & Sons (the  "Adviser") to act as adviser to
the Vendors with respect to the transactions contemplated by the Nevis Agreement
and this Agreement. As payment for such advisory services, the Vendors shall pay
pro rata to the Adviser a success fee (the "Success  Fee") equal to 1.75% of the
aggregate amount of  consideration  received by the Vendors from the proceeds of
sale in  respect  of the  Nevis  Agreement  and this  Agreement,  including  any
escrowed  or  contingent  amounts  of such  consideration,  and  any  additional
consideration  payable pursuant to any  post-closing  adjustment under the Nevis
Agreement and this Agreement. The Adviser will reallow 3/7ths of the Success Fee
to certain  officers or  directors  of the Company or  Morrison.  The  foregoing
arrangement has been approved by representatives of the largest shareholder, Gas
Systems I  Corporation  (on behalf of the trustees of General  Electric  Pension
Trust).

11.2  Public Notices

Each of the Parties shall be entitled to  communicate  the details of the within
transaction to its shareholders and employees and to investment  analysts and to
issue press releases,  notwithstanding  the Confidentiality  Agreement.  A Party
making any such communication shall advise the other Party of the occurrence and
nature of each such disclosure and shall deliver a copy of each press release to
the other Party so that the other Party will have the  opportunity to review the
press release in advance of its dissemination. All other public notices to third
parties and all other publicity concerning the transactions contemplated by this
Agreement  shall be jointly  planned and coordinated by the Parties and no Party
shall act  unilaterally  in this regard  without the prior approval of the other
Party, such approval not to be unreasonably withheld, except:

(a)   in the case of the Vendors for communications made in
confidence to the Company's employees affected by such
transactions; or

(b) where required to do so by law or by the applicable  regulations or policies
of  any  provincial  or  Canadian  or  other  regulatory   agency  of  competent
jurisdiction  or any stock exchange in  circumstances  where prior  consultation
with the other Party is not practicable.




  
<PAGE>


11.3  Expenses

All costs and expenses  (including the fees and  disbursements of legal counsel)
incurred in connection  with this  Agreement and the  transactions  contemplated
hereby shall be paid by the Party  incurring such expenses;  provided,  however,
the Company shall not bear any of the costs and expenses incurred in whole or in
part by the Vendors in connection  with this  Agreement and the Nevis  Agreement
and the transactions contemplated hereby and thereby.

11.4  Notices

Any  notice or other  writing  required  or  permitted  to be given  under  this
Agreement or for the purposes of this Agreement  (referred to in this Section as
a "Notice")  shall be  sufficiently  given if  delivered  or if  transmitted  by
facsimile or other form of recorded communication to such Party:

(a)   to the Representative, for and on behalf of all of the
Vendors in the case of a Notice to the Vendors at:

Bernard Feshbach
            #404, 1510 Oak Creek Drive
            Palo Alto, California
            94304-2032

            Fax:        (415) 321-5627

            with a copy to:

            Bennett Jones Verchere
            4500 Bankers Hall East
            855 - 2nd Street S.W.
            Calgary, AB  T2P 4K7

            Attention:        Donald E. Greenfield
            Fax:        (403) 265-7219

            and to:

            Curtis, Mallet-Provost, Colt & Mosle
            101 Park Avenue
            New York, New York
            10178-0061

            Attention:        Albert Francke
                        Carl Ruggiero
            Fax:        (212) 697-1559

(b)   prior to the Closing, in the case of a Notice to the Company
at:

CGGS CANADIAN GAS GATHERING SYSTEMS INC.
            #3000, 400 - 3rd Avenue S.W.
            Calgary, Alberta
            T2P 4H2

  
<PAGE>



            Attention:        Ken Woolner
            Fax:        (415) 750-3186

            with a copy to:

            Bennett Jones Verchere
            4500 Bankers Hall East
            855 - 2nd Street S.W.
            Calgary, AB  T2P 4K7

            Attention:        Donald E. Greenfield
            Fax:        (403) 265-7219

            and to:

            Curtis, Mallet-Provost, Colt & Mosle
            101 Park Avenue
            New York, New York
            10178-0061

            Attention:        Albert Francke
                        Carl Ruggiero
            Fax:        (212) 697-1559

(c)   in the case of a notice to the Purchaser or to the Company
subsequent to Closing:

Abraxas Petroleum Corporation
            500 North Loop 1604 East, Suite 100
            San Antonio, Texas
            U.S.A.   78232

            Attention:        Robert L. G. Watson
            Fax:        (210) 490-8816

with a copy to:

Cox & Smith Incorporated
            112 E. Pecan Street, Suite 1800
            San Antonio, Texas
            U.S.A.   78205

            Attention:        Steven R. Jacobs
            Fax:        (210) 226-8395

or at such other  address as the Party to whom such  Notice is to be given shall
have last  notified  the Party giving the same,  in the manner  provided in this
Section.  Any Notice  delivered to the Party to whom it is addressed as provided
in this Section shall be deemed to have been given and received on the day it is
so delivered at such  address,  provided  that if such day is not a Business Day
then the Notice  shall be deemed to have been given and received on the Business
Day next following such day. Any Notice sent by prepaid  registered mailed shall
be deemed  to have  been  given and  received  on the  fifth  Business  Day next


<PAGE>




following the date of its mailing.  Any notice transmitted by facsimile or other
form of recorded  communication  shall be deemed given and received on the first
Business Day after its transmission.

11.5  Parties in Interest

This  Agreement  is binding upon and is for the benefit of the Parties and their
respective  successors and permitted assigns. This Agreement is not made for the
benefit of any person not a party to this  Agreement,  and no Person  other than
the Parties or their respective  successors and permitted  assigns shall acquire
or have any right, remedy or claim under or by virtue of this Agreement.

11.6  Time

Time shall be of the essence of this Agreement.

11.7  Assignment, Successors and Assigns

Neither  any  Vendor  nor the  Purchaser  shall  assign  all or any part of this
Agreement  nor any of its  rights or  obligations  under this  Agreement  to any
Person,  without  the  prior  written  consent  of  the  other.  Subject  to the
foregoing,  this Agreement shall enure to the benefit of and be binding upon the
Parties and their  respective  successors  (including any successor by reason of
amalgamation of any Party) and permitted assigns.

11.8  Further Assurances

The Parties shall with  reasonable  diligence do all such things and provide all
such  reasonable  assurances as may be required to consummate  the  transactions
contemplated  by this  Agreement,  and each Party  shall  provide  such  further
documents  or  instruments  required  by the  other  Party as may be  reasonably
necessary or desirable to effect the purpose of this Agreement and carry out its
provisions, whether before or after the Closing.

11.9  Counterparts

This Agreement may be executed by the Parties in separate  counterparts  each of
which  when so  executed  and  delivered  shall  be an  original,  but all  such
counterparts shall together constitute one and the same instrument.



ARTICLE 12
TERMINATION

12.1  Termination

In addition to termination as provided elsewhere herein, this


<PAGE>



Agreement may be terminated and the transactions  contemplated  hereby abandoned
at any time prior to the Closing:

(a)   automatically if:

      (i)   Closing has not occurred on or before December 31,
1996;

      (ii)  there  shall  be  any  statute,   rule,  or  regulation  that  makes
consummation  of the  transactions  contemplated  hereby  illegal  or  otherwise
prohibited or a Governmental  Authority shall have issued an order,  decree,  or
ruling  or  taken  any  other  action  permanently  restraining,  enjoining,  or
otherwise prohibiting the consummation of the transactions  contemplated hereby,
and such order,  decree,  ruling,  or other  action  shall have become final and
nonappealable;

(b)   by mutual written agreement of the Parties;

(c)   by the Vendors with notice to the Purchaser if one or more
of the conditions set forth in Article 7 are not satisfied as of
the Closing Date;

(d)   by the Purchaser with notice to the Vendors if one or more
of the conditions set forth in Article 6 are not satisfied as of
the Closing Date;

(e)   by the Vendors pursuant to Section 2.6.


12.2  Effect of Termination

In the event of the termination of this Agreement by a Party pursuant to Section
12.1 or otherwise,  written notice thereof shall forthwith be given to the other
Parties  specifying the provision  hereof pursuant to which such  termination is
made, and this Agreement  shall become void and have no effect,  and there shall
be no  liability  hereunder  on the part of any of the  Parties (or any of their
respective directors,  officers,  employees,  shareholders, or representatives),
except such  liabilities  or damages as are  provided  for in Section  2.7(c) in
respect of the  Purchaser  and in Section  2.8 in  respect of the  Vendors.  The
provisions  contained in this Section and in Section 3.41, 3.46, 4.6, 11.1, 11.2
and 11.3 and Article 13 shall survive the termination hereof.

ARTICLE 13
ARBITRATION

13.1  Arbitration

(a) Any  dispute  arising  in  connection  with the  Agreement  shall be finally
settled under the Rules of  Conciliation  and  Arbitration of the  International
Chamber of Commerce:


<PAGE>



      (i)   by one arbitrator nominated by the Parties;

      (ii)  in Calgary, Alberta;

      (iii)       in the English language; and

      (iv)  the laws of Alberta shall govern.

(b) Subject to Section 2.9, a Party wishing to have recourse to  arbitration  by
the International  Chamber of Commerce shall, in addition to the requirements of
the Rules of  Conciliation  and  Arbitration  of the  International  Chamber  of
Commerce, advise the other Party of its intention to do so by giving at least 10
days notice as herein provided  specifying the subject of dispute,  the contract
number and date and that Party's choice of arbitrator.

(c) For purposes of this Agreement, a dispute shall include a difference between
the Parties as to the  interpretation,  application  or  administration  of this
Agreement,  any failure to agree where  agreement  between the Parties is called
for  and any  dispute  which  this  Agreement  specifically  provides  shall  be
arbitrated where the Parties are unable to resolve a dispute.

      IN WITNESS WHEREOF the Parties have hereunto duly executed this Agreement.



<PAGE>



CANADIAN ABRAXAS PETROLEUM LIMITED


By:
      Name:
      Title:

By:
      Name:
      Title:


CGGS CANADIAN GAS GATHERING SYSTEMS INC.

By:
      Name:
      Title:

By:
      Name:
      Title:


GAS SYSTEMS I CORPORATION

By:
      Name:
      Title:

By:
      Name:
      Title:



WITNESS



WITNESS






FLEET NATIONAL BANK, as Trustee of Echlin Pension Master Trust

By:
      Name:
      Title:

By:
      Name:


<PAGE>



      Title:


MELLON BANK, N.A., as Trustee for the Alcoa Master Trust

By:
      Name:
      Title:

By:
      Name:
      Title:


STATE STREET BANK AND TRUST COMPANY, as Trustee of the GMI/DRI
Investment Trust

By:
      Name:
      Title:

By:
      Name:
      Title:


ROYAL TRUST CORPORATION OF CANADA, in trust for the Kodak Canada
Inc. Retirement Income Plan

By:
      Name:
      Title:

By:
      Name:
      Title:


GENERAL REINSURANCE CORPORATION


By:
      Name:
      Title:

By:
      Name:
      Title:

ABRAXAS PETROLEUM CORPORATION


By:
      Name:


<PAGE>



      Title:

By:
      Name:
      Title:


MORRISON PETROLEUMS LTD.


By:
      Name:
      Title:

By:
      Name:
      Title:


GAS SYSTEMS II CORPORATION

By:
      Name:
      Title

By:
      Name:
      Title:



BERNARD FESHBACH



DENNIS P. LYNCH






MARCUS SCHLOSS & CO., INC.


By:
      Name:
      Title:

By:
      Name:
      Title:




<PAGE>


MORGAN GUARANTY TRUST CO. OF N.Y. as Trustee

By:
      Name:
      Title:

By:
      Name:
      Title:


BOSTON SAFE DEPOSIT AND TRUST COMPANY, as Trustee of Kodak
Retirement Income Plan

By:
      Name:
      Title:

By:
      Name:
      Title:


HOWARD HUGHES MEDICAL INSTITUTE


By:
      Name:
      Title:

By:
      Name:
      Title:


BEINECKE INVESTMENT FUND, L.P., by Ashford Capital Management,
Inc. as general partner

By:
      Name:
      Title:

By:
      Name:
      Title:





<PAGE>



                         PURCHASE AND SALE AGREEMENT

      THIS PURCHASE AND SALE AGREEMENT  ("Agreement") dated as of September ___,
1996  by  and  among  Abraxas  Petroleum   Corporation,   a  Nevada  corporation
("Abraxas"),  Acco, LLC, a Massachusetts  limited  liability  company  ("Acco"),
Massachusetts   Bay   Transportation   Authority   Retirement   Fund   ("MBTA"),
Metropolitan  Life Insurance  Company Separate Account No. 175 ("MetLife"),  The
General Mills, Inc. Master Trust:  Pooled Real Estate Fund ("General Mills" and,
together with MBTA and MetLife,  the "SSR  Investors") and State Street Research
Energy, Inc., a Massachusetts corporation ("State Street").

                             W I T N E S S E T H:

      WHEREAS,  Acco owns a 75% limited partnership interest (the "Interest") in
Portilla - 1996, L.P., a Texas limited partnership (the "Partnership");

      WHEREAS,  the SSR Investors are the holders of (i) promissory notes of the
Partnership dated March 20, 1996 and the date hereof in the aggregate  principal
amount of  $6,451,151.33  (the "Notes") and (ii) options to purchase  overriding
royalty  interests  (the "ORI  Options")  in the  Portilla  Field,  San Patricio
County, Texas ("Portilla"), and the Happy Field, Garza County, Texas ("Happy");

      WHEREAS,  Acco desires to sell the Interest,  the SSR Investors  desire to
sell  the  Notes  and the ORI  Options  and  Abraxas  desires  to  purchase  the
Interests, the Notes and the ORI Options;

      NOW, THEREFORE, IT IS AGREED:



                                  ARTICLE I

                               SALE OF INTEREST

      1.01  Sale of  Interest.  Subject  to the  terms  and  conditions  of this
Agreement,  Acco and the SSR Investors (collectively,  "Sellers") agree to sell,
assign,  transfer  and  deliver to Abraxas on the Closing  Date (as  hereinafter
defined),  and Abraxas  agrees to purchase from Sellers on the Closing Date, the
Interest, the Notes and the ORI Options.

      1.02 Consideration. In consideration for the purchase of the Interest, the
Notes and the ORI Options by Abraxas,  at the Closing,  the  following  payments
shall be made:

            (a) Abraxas shall  purchase the Interest from Acco in  consideration
of the payment of $87,177.67 in cash by certified or bank cashier's check at the
Closing  and  the  assumption  by  Abraxas  of all  of  Acco's  liabilities  and
obligations  pursuant to the loan made to Acco (the "Christiania Loan") pursuant
to that  certain  Credit  Agreement  dated as of March  20,  1996  (the  "Credit
Agreement") by and between Acco and Christiania Bank og

                                     1


0135432.01


<PAGE>



Kreditkasse  ("Christiania")  including,  but  not  limited  to,  all of  Acco's
obligations under the Loan Papers (as defined in the Credit Agreement) and under
Sections  7.15 and 8.13 of the Credit  Agreement  except as set forth in Section
9.01 hereof;

            (b) Abraxas shall purchase that certain  Promissory Note dated March
20, 1996 in the aggregate  principal amount of $1,000,000 and payable to MBTA as
supplemented by that certain  Promissory Note dated as of the date hereof in the
aggregate  principal  amount of $89,721.51  and payable to MBTA  (together,  the
"MBTA  Note")  in  consideration  of the  payment  of  $1,089.721.51  to MBTA by
certified or bank cashier's check at the Closing;

            (c) Abraxas shall purchase that certain  Promissory Note dated March
20, 1996 in the aggregate  principal amount of $3,920,000 and payable to MetLife
as supplemented  by that certain  Promissory Note dated as of the date hereof in
the aggregate  principal amount of $351,708.31 and payable to MetLife (together,
the "MetLife Note") in  consideration of the payment of $4,271,708.31 to MetLife
by certified or bank cashier's check at the Closing;

            (d) Abraxas shall purchase that certain  Promissory Note dated March
20, 1996 in the aggregate  principal amount of $1,000,000 and payable to General
Mills as  supplemented  by that  certain  Promissory  Note  dated as of the date
hereof in the aggregate  principal  amount of $89,721.51  and payable to General
Mills  (together,  the "General Mills Note") in  consideration of the payment of
$1,089,721.51  to General  Mills by  certified  or bank  cashier's  check at the
Closing;

            (e) Abraxas shall  purchase all right,  title and interest in and to
that  certain  Royalty  Option  dated March 20, 1996 in favor of MBTA (the "MBTA
Option")  in  consideration  of the  payment  of  $64,189.19  to MBTA in cash by
certified or bank cashier's check;

            (f) Abraxas shall  purchase all right,  title and interest in and to
that  certain  Royalty  Option  dated  March 20,  1996 in favor of MetLife  (the
"MetLife  Option") in  consideration of the payment of $251,621.62 to MetLife in
cash by certified or bank cashier's check;

            (g) Abraxas shall  purchase all right,  title and interest in and to
that certain  Royalty Option dated March 20, 1996 in favor of General Mills (the
"General Mills Option") in consideration of the payment of $64,189.19 to General
Mills in cash by certified or bank cashier's check.

      The amounts payable pursuant to paragraphs (e), (f) and (g) above shall be
reduced pro rata by the amount payable to State Street  pursuant to Section 1.05
hereof.

      In the event that the transactions contemplated by this Agreement have not
been consummated on or prior to October 20, 1996, in addition to the payments to
be made to the Sellers  pursuant to this Section  1.02,  Abraxas  shall also pay

                                     2


0135432.01


<PAGE>




interest  to the Sellers at a rate of 10% per annum on the  principal  amount of
the Notes for the period from October 21, 1996 to the earlier of (i) the Closing
Date or (ii) December 31, 1996. Such interest shall be payable on the earlier of
(i) the Closing Date or (ii) January 15, 1997.

      1.03  Further  Assurances.  Sellers  agree  that,  from  time to time,  at
Abraxas'  request and without  further  consideration,  Sellers will execute and
deliver such  additional  instruments of transfer and take such other actions as
Abraxas may require to more effectively transfer ownership of the Interest,  the
Notes and the ORI Options to Abraxas, as applicable.

      1.04 Closing.  The closing  ("Closing") of the  transactions  contemplated
hereby  shall take place at the  offices  of Cahill,  Gordon & Reindel,  80 Pine
Street,  New  York,  New York  10005 on the date that all of the  conditions  to
Closing set forth in Articles IV and V hereof have been  satisfied  or waived or
such other time and place as the  parties  hereto may agree.  The date,  as thus
determined,  on which  the  Closing  will be held is herein  referred  to as the
"Closing Date".

      1.05  Termination  of Advisory  Agreement.  At the  Closing,  the Advisory
Agreement  between the  Partnership  and State Street shall be  terminated,  and
Abraxas shall pay State Street an amount equal to the expenses incurred by State
Street pursuant to Section 9.01.


                                  ARTICLE II

                  REPRESENTATIONS AND WARRANTIES OF SELLERS

      Each of Acco, MBTA, MetLife, General Mills and State Street, severally for
itself,  and not jointly and  severally,  represents,  warrants  and agrees,  as
follows:

      2.01 Ownership of Interest.  (a) Acco is the lawful owner of the Interest,
free and clear of all liens, encumbrances, restrictions and claims of every kind
other  than  liens,  encumbrances,   restrictions  and  claims  related  to  the
Christiania  Loan. Acco has full legal right,  power and authority to enter into
this Agreement and to sell, assign, transfer and convey the Interest pursuant to
this  Agreement.  The sale by Acco to Abraxas of the  Interest  pursuant  to the
provisions of this Agreement will transfer to Abraxas good, valid and marketable
title  thereto,  free  and  clear  of  all  liens,  encumbrances,  restrictions,
mortgages, pledges, charges or claims of every kind (collectively, "Liens").

      (b) MBTA is the lawful  owner of the MBTA Note and the MBTA  Option,  free
and clear of all liens,  encumbrances,  restrictions  and claims of every  kind.
MBTA has full legal right,  power and authority to enter into this Agreement and
to sell, assign,  transfer and convey the MBTA Note and the MBTA Option pursuant
to this  Agreement.  The sale by MBTA to  Abraxas  of the MBTA Note and the MBTA
Option  pursuant to the  provisions of this  Agreement  will transfer to Abraxas
good, valid and marketable title thereto, free and clear of all Liens.

                                     3


0135432.01


<PAGE>





      (c)  MetLife  is the  lawful  owner of the  MetLife  Note and the  MetLife
Option,  free and clear of all liens,  encumbrances,  restrictions and claims of
every kind. MetLife has full legal right, power and authority to enter into this
Agreement  and to sell,  assign,  transfer  and convey the MetLife  Note and the
MetLife Option pursuant to this Agreement. The sale by MetLife to Abraxas of the
MetLife Note and the MetLife Option pursuant to the provisions of this Agreement
will transfer to Abraxas good,  valid and  marketable  title  thereto,  free and
clear of all Liens.

      (d) General  Mills is the lawful  owner of the General  Mills Note and the
General Mills Option,  free and clear of all liens,  encumbrances,  restrictions
and  claims  of every  kind.  General  Mills  has full  legal  right,  power and
authority to enter into this Agreement and to sell, assign,  transfer and convey
the General Mills Note and the General Mills Option  pursuant to this Agreement.
The sale by General  Mills to Abraxas of the General  Mills Note and the General
Mills Option  pursuant to the  provisions  of this  Agreement  will  transfer to
Abraxas good, valid and marketable title thereto, free and clear of all Liens.

      2.02  Power  and  Authority.  Acco has the power  and  authority  to make,
execute,  deliver and perform this  Agreement,  and this Agreement has been duly
authorized and approved by all required  action.  State Street has the power and
authority to make, execute, deliver and perform this Agreement on behalf of each
of MBTA,  MetLife and General Mills, and this Agreement has been duly authorized
and approved by all required action of each of MBTA, MetLife and General Mills.

      2.03 Broker's or Finder's Fees. No agent, broker, person or firm acting on
behalf of the Sellers are, or will be, entitled to any commission or broker's or
finder's fees from any of the Sellers.

      2.04  Receipt of  Information.  Acco and State  Street  (acting on its own
behalf and on behalf of the SSR Investors)  acknowledge  the receipt of a letter
dated July 15, 1996 from Abraxas  relating to Portilla and copies of the reserve
report prepared by DeGoyler and MacNaughton relating to Portilla and Happy dated
June 30, 1996.  Each of Acco and State  Street  (acting on its own behalf and on
behalf of the SSR Investors) has had the opportunity to review such  information
and has had the opportunity to ask questions of and receive answers from Abraxas
concerning  the  Partnership,  Portilla  and  Happy  and the  future  plans  and
prospects thereof.  Each of Acco, MBTA, MetLife,  General Mills and State Street
is an  Accredited  Investor  (as  defined  in Rule  501  promulgated  under  the
Securities  Act of 1933, as amended).  Each of Acco and State Street  (acting on
its own behalf and on behalf of the SSR Investors) has engaged such professional
advisers  including,  without limitation,  legal, tax and petroleum  engineering
advisers,   as  it  deemed   necessary  in  connection  with  the   transactions
contemplated hereby.


                                

                                     4


0135432.01


<PAGE>

                                   ARTICLE III

                           REPRESENTATIONS OF ABRAXAS

      Abraxas represents, warrants and agrees as follows:

      3.01 Existence and Good Standing of Abraxas. Abraxas is a corporation duly
organized,  validly existing and in good standing under the laws of the State of
Nevada.

      3.02 Power and Authority. Abraxas has the corporate power and authority to
make, execute,  deliver and perform this Agreement,  and this Agreement has been
duly authorized and approved by all required corporate action of Abraxas.

      3.03 Broker's or Finder's Fees. No agent, broker, person or firm acting on
behalf of Abraxas  is, or will be,  entitled  to any  commission  or broker's or
finder's fees from Abraxas.

      3.04 No Net Income.  The  Partnership  has not had any net taxable  income
since its inception.


                                  ARTICLE IV

                      CONDITIONS TO ABRAXAS' OBLIGATIONS

      All  obligations  of Abraxas to be discharged  under this Agreement at the
Closing are subject to the fulfillment,  prior to or at the Closing,  of each of
the following conditions, unless waived in writing by Abraxas prior to or at the
Closing:

      4.01 Truth of  Representations  and Warranties.  The  representations  and
warranties  of Acco,  the SSR  Investors  and  State  Street  contained  in this
Agreement  shall be true and correct on and as of the Closing Date with the same
effect as though such  representations and warranties had been made on and as of
such date and Acco, the SSR Investors and State Street shall have each delivered
to Abraxas a certificate, dated the Closing Date, to such effect.

      4.02 No Litigation  Threatened.  No action or proceedings  shall have been
instituted  or, to the best knowledge of Sellers,  threatened  before a court or
other  government body or by any public authority to restrain or prohibit any of
the transactions contemplated hereby.

      4.03  Proceedings.  All  proceedings  to be taken in  connection  with the
transactions  contemplated by this Agreement and all documents  incident thereto
shall be reasonably  satisfactory in form and substance to Abraxas,  and Abraxas
shall have received  copies of all such  documents and other  evidences as it or
its counsel may  reasonably  request in order to establish the  consummation  of
such transactions and the taking of all proceedings in connection therewith.


                                     5


0135432.01


<PAGE>




      4.04 Mutual Release. Sellers and Abraxas shall have executed and delivered
a  Mutual  Release  in  substantially  the  form  of  Exhibit  "A"  hereto  (the
"Release").

      4.05 Documents and Instruments. Sellers shall have executed such documents
and instruments as may be reasonably  requested by Abraxas to effectively  sell,
transfer,  assign  and  convey the  Interest,  the Notes and the ORI  Options to
Abraxas.

      4.06  Financing.  Abraxas shall have received financing on such terms and
conditions as may be reasonably satisfactory to Abraxas.


                                  ARTICLE V

                     CONDITIONS TO SELLERS'S OBLIGATIONS

      All  obligations  of Sellers to be discharged  under this Agreement at the
Closing are subject to the fulfillment,  prior to or at the Closing,  of each of
the following conditions, unless waived in writing by Sellers prior to or at the
Closing:

      5.01 Truth of  Representations  and Warranties.  The  representations  and
warranties of Abraxas  contained in this Agreement  shall be true and correct on
and as of the Closing  Date with the same effect as though such  representations
and  warranties  had been made on and as of such date,  and  Abraxas  shall have
delivered to Sellers a certificate, dated the Closing Date, to such effect.

      5.02 No Litigation  Threatened.  No action or  proceeding  shall have been
instituted  or, to the best knowledge of Abraxas,  threatened  before a court or
other  government body or by any public authority to restrain or prohibit any of
the transactions contemplated hereby.

      5.03  Proceedings.  All  proceedings  to be taken in  connection  with the
transactions  contemplated by this Agreement and all documents incident thereto,
shall be  reasonably  satisfactory  in form and  substance  to  Sellers  and its
counsel,  and Sellers shall have received copies of all such documents and other
evidences as it or its counsel may reasonably  request in order to establish the
consummation  of  such  transactions  and  the  taking  of  all  proceedings  in
connection therewith.

      5.04 Mutual Release. Sellers and Abraxas shall have executed and delivered
the Release.

      5.05 Documents and Instruments.  Abraxas shall have executed and delivered
such  documents  and  instruments  as may be  reasonably  requested  by  Acco to
effectuate the assumption of the  Christiania  Loan by Abraxas and, in the event
that  Abraxas  does not  repay the  Christiania  Loan and  assume  all of Acco's

                                     6


0135432.01


<PAGE>




obligations  under the Loan  Papers  except as set forth in Section  9.01 hereof
substantially   simultaneously   with  the   consummation  of  the  transactions
contemplated  hereby,  Abraxas  shall  have  obtained  the  release  of  Acco by
Christiania.


                                  ARTICLE VI

                                  COVENANTS

      6.01 Reasonable Efforts. Abraxas will use its reasonable efforts to obtain
the necessary  financing  through a private  placement of debt  securities to be
closed on or before  September  30,  1996.  If Abraxas is unable to complete the
offering by September 30, 1996, Abraxas agrees to continue to use its reasonable
efforts to pursue alternative  financing  arrangements and, in all events,  will
attempt to complete the purchase of the Interest,  the Notes and the ORI Options
no later than December 31, 1996.

      6.02 Public Announcements.  Upon execution and delivery of this Agreement,
Abraxas  will issue a press  release  reasonably  satisfactory  to  Abraxas  and
Sellers. Otherwise, none of the parties hereto shall, prior to the Closing, make
any public announcement or disclosure relating to the transactions  contemplated
hereby without the prior consent of each other party hereto; provided,  however,
that each party shall consult with the other in advance of making any disclosure
required by law,  but the  agreement  of the other  parties  hereto shall not be
required.

      6.03 Pre-Closing Operations. Prior to the Closing, Abraxas will contribute
to the  Partnership  all monies  necessary  for the  Partnership  (a) to pay its
operating expenses and (b) to make the minimum distributions  necessary for Acco
to make required  payments on the  Christiania  Loan;  provided,  however,  that
Abraxas  shall not be obligated to make  contributions  pursuant to this Section
6.03 after December 31, 1996.


                                 ARTICLE VII

                  TAX MATTERS, DISTRIBUTIONS AND ALLOCATIONS

      7.01 Liquidation and/or Sale of Interest. For federal income tax purposes,
it is the intention of the parties that the purchase and sale of the Interest be
treated as a sale of Acco's interest in the Partnership pursuant to Sections 741
of Subchapter K of the Internal Revenue Code of 1986, as amended.

      7.02  Allocations of Profits and Losses.  Abraxas and Acco agree that Acco
shall be  allocated  its  pro-rata  share (in  accordance  with  Acco's  Capital
Percentage  and  Capital  Ratio,  as  such  terms  are  defined  in the  limited
partnership  agreement  of  the  Partnership)  of the  Partnership's  cumulative
profits  and/or  losses  for the  portion  of the 1996  taxable  year  that were
generated from March 20, 1996 to and including the Closing Date.

                                     7


0135432.01


<PAGE>



      7.03 Tax Returns and Information Statements.  Abraxas shall be responsible
for the preparation and timely filing of the Partnerships income tax returns for
the 1996 calendar year including, but not limited to, any information statements
related  to the sale  and/or  liquidation  of the  Interest.  Abraxas  agrees to
provide to Acco, in a timely fashion,  any information  reasonably  requested by
Acco in order for Acco to accurately report and reflect the sale of the Interest
on Acco's 1996 income tax return including, but not limited to, the reporting of
Acco's proportionate share of profits and/or losses from the Partnership.


                                 ARTICLE VIII

                   SURVIVAL OF REPRESENTATIONS; INDEMNITY;
                           LIMITATION OF LIABILITY

      8.01 Survival of  Representations.  The  representations and warranties of
each of the  parties  hereto  contained  in this  Agreement  shall  survive  the
purchase and sale of the  Interest,  the Notes and the ORI Options  contemplated
hereby.

      8.02  Indemnification  by  the  Sellers  and  Management.   Sellers  agree
severally,  and not jointly and  severally,  to indemnify and hold Abraxas,  its
directors,  officers,  employees and agents  harmless  from  damages,  losses or
expenses (net of any insurance proceeds)  (collectively,  "Damages") suffered or
paid,  directly  or  indirectly,  by Abraxas as a result of any and all  claims,
demands,  suits,  causes  of  action,  proceedings,  judgments  and  liabilities
(whether   asserted  directly  or  as  a  common  law  or  statutory  claim  for
contribution or indemnity),  including,  without limitation,  reasonable counsel
fees and costs  incurred  in  litigation  or  otherwise,  assessed,  incurred or
sustained  by or  against  any of them with  respect  to or  arising  out of the
failure of any  representation  or warranty made by Sellers in this Agreement to
be true and correct in all respects as of the date of this  Agreement  and as of
the Closing Date or the breach of any covenant made by the Sellers hereunder.

      8.03  Indemnification  by Abraxas.  Abraxas  agrees to indemnify  and hold
Sellers  harmless from Damages  suffered or paid,  directly or indirectly,  as a
result of any and all claims,  demands,  suits,  causes of action,  proceedings,
judgments  and  liabilities,  including  reasonable  counsel  fees  incurred  in
litigation  or otherwise,  assessed,  incurred or sustained by or against any of
them with  respect to or arising  out of the  failure of any  representation  or
warranty  made by  Abraxas  in this  Agreement  to be true  and  correct  in all
respects  as of the date of this  Agreement  and as of the  Closing  Date or the
breach of any covenant made by Abraxas hereunder.

      8.04 Notice of Claim. If indemnification pursuant to Sections 8.02 or 8.03
is sought,  the indemnified party shall give notice to the indemnifying party of
an event giving rise to the  obligation  to  indemnify,  allow the  indemnifying
party to assume and  conduct  the  defense of the claim or action  with  counsel
reasonably  satisfactory  to the  indemnified  party,  and  cooperate  with  the
indemnifying party in the defense thereof; provided,  however, that the omission
to give such notice to the indemnifying party shall not relieve the indemnifying

                                     8


0135432.01


<PAGE>



party from any liability which it may have to the indemnified  party,  except to
the extent that the indemnifying party is prejudiced by the failure to give such
notice. The indemnified party shall have the right to employ separate counsel to
represent the indemnified  party if the indemnified  party is advised by counsel
that a conflict of interest makes it advisable for the  indemnified  party to be
represented  by separate  counsel and the  reasonable  expenses and fees of such
separate counsel shall be paid by the indemnifying party. If the party obligated
to  indemnify  and hold the other  harmless  wrongfully  refuses  to assume  the
defense of the party seeking  indemnification,  the party  refusing to indemnify
shall be  responsible,  for all legal and other  expenses  incurred by the other
party in connection  with the  investigation  or defense of such claim or action
including, without limitation, expenses incurred in enforcing such obligation to
indemnify.


                                  ARTICLE IX

                                MISCELLANEOUS

      9.01  Expenses.  The parties  hereto  shall pay all of their own  expenses
relating to the transactions contemplated by this Agreement,  including, without
limitation,  the fees and  expenses of their  respective  counsel and  financial
advisers; provided, however, Abraxas shall pay all filing and recording fees and
expenses in connection with the purchase and sale of the Interest, the Notes and
the ORI  Options.  Notwithstanding  anything to the  contrary  set forth in this
Agreement,  Acco shall be responsible for the fees and expenses,  including fees
and expenses of counsel,  of Christiania  incurred in connection with the Credit
Agreement and the transactions  contemplated  hereby up to a maximum of $25,000;
provided,  however,  that if Christiania's fees and expenses exceed $25,000, the
parties  hereto agree to negotiate  in good faith  regarding  the payment of the
fees and expenses in excess of $25,000.

      9.02 Governing Law. The interpretation and construction of this Agreement,
and all matters relating  hereto,  shall be governed by the laws of the State of
Texas.

      9.03  Captions.  The  Article  and  Section  captions  used herein are for
reference  purposes  only,  and  shall  not in any way  affect  the  meaning  or
interpretation of this Agreement.

      9.04  Notices.  Any notice or other  communications  required or permitted
hereunder  shall  be  sufficiently  given  if  delivered  in  person  or sent by
registered or certified mail, postage prepaid, if to:

      If to Abraxas:

            Abraxas Petroleum Corporation
            500 North Loop 1604 East, Suite 100
            San Antonio, Texas  78232

                                     9


0135432.01


<PAGE>



            Attention:  Robert L. G. Watson

      With a copy to:

            Cox & Smith Incorporated
            112 E. Pecan Street, Suite 1800
            San Antonio, Texas  78205
            Attention:  Steven R. Jacobs

      If to Sellers:

            State Street Research Energy, Inc.
            One Financial Center
            31st Floor
            Boston, MA  02109
            Attention:  Tom Moore

      With a copy to:

            Mintz, Levin, Cohen, Ferris, Glovsky and Popeo, P.C.
            One Financial Center
            Boston, Massachusetts  02111
            Attention:  Thomas J. Kelly

            and

            Baker & Botts, L.L.P.
            One Shell Plaza
            910 Louisiana
            Houston, Texas  77002-4995
            Attention:  Frank W. R. Hubert, Jr.

or such other  address as shall be furnished  in writing by any such party,  and
such notice or  communication  shall be deemed to have been given as of the date
so delivered or mailed.

      9.05 Parties in Interest. This Agreement may not be transferred, assigned,
pledged or hypothecated by any party hereto other than by operation of law. This
Agreement  shall be binding  upon and shall  inure to the benefit of the parties
hereto and their respective  heirs,  executors,  administrators,  successors and
assigns.

      9.06  Counterparts.  This  Agreement  may  be  executed  in  two  or  more
counterparts, all of which taken together shall constitute one instrument.

      9.07 Entire  Agreement.  This  Agreement,  including  the other  documents
referred to herein which form a part hereof or any other written agreements that

                                     10


0135432.01


<PAGE>




the parties enter into pursuant to or relating to the transactions  contemplated
by this Agreement,  contains the entire understanding of the parties hereto with
respect to the subject  matter  contained  herein and  therein.  This  Agreement
supersedes  all prior  agreements  and  understandings  between the parties with
respect to such subject  matter.  All exhibits and schedules  referred to herein
and attached hereto are incorporated herein by reference.

      9.08 Amendments.  This Agreement may not be changed orally, but only by an
agreement in writing signed by all of the parties hereto.

      9.09  Severability.  In case any provision in this Agreement shall be held
invalid, illegal or unenforceable,  the validity, legality and enforceability of
the  remaining  provisions  hereof  will not in any way be  affected or impaired
thereby.

      9.10 Third  Party  Beneficiaries.  Each  party  hereto  intends  that this
Agreement  shall not  benefit  or  create  any right or cause of action in or on
behalf of any person other than the parties hereto.

      9.11   Arbitration.   The  parties   hereto   agree  that  all   disputes,
controversies  or claims that may arise among them  (including  their agents and
employees)  including,  without  limitation,  any dispute,  controversy or claim
arising out of or  relating to this  Agreement  or any other  agreement,  or the
breach,  termination  or  invalidity  thereof,  whether  entered into or arising
prior,  on or  subsequent  to the  date  hereof,  shall  be  submitted  to,  and
determined  by,  binding  arbitration.  Such  arbitration  shall be conducted in
accordance  with the terms of Section 12.9 of the  Partnership  Agreement of the
Partnership.

      IN WITNESS WHEREOF,  the parties hereto have executed this Agreement to be
effective as of the day and year first above written.


                              ABRAXAS PETROLEUM CORPORATION



                              By:
                              Robert L. G. Watson,
                               Chairman of the Board, President
                               and Chief Executive Officer



                              




                                     11


0135432.01


<PAGE>

                              ACCO, LLC

                              By:
                              Title:



                              STATE STREET RESEARCH ENERGY, INC.,
                                 Creditors Representative of Massachusetts
                                 Bay Transportation Authority Retirement
                                 Fund, Metropolitan Life Insurance Company
                                 Separate Account No. 175 and The General
                                 Mills, Inc. Master Trust: Pooled Real Estate
                                 Fund


                              By:
                              Title:


                              STATE STREET RESEARCH ENERGY, INC.
   

                              By:
                              Title:























                                     12


0135432.01


                AMENDED AND RESTATED CREDIT AGREEMENT





                     ABRAXAS PETROLEUM CORPORATION,
                            as the Borrower,


                        the Banks named herein,

                                  and

                         BANKERS TRUST COMPANY,
                                as Agent

                                  and

                    ING (U.S.) CAPITAL CORPORATION,
                              as Co-Agent



                 AMENDED AND RESTATED CREDIT AGREEMENT


                     Dated as of November 14, 1996





HOU04:43581.4


<PAGE>



TABLE OF CONTENTS


PRELIMINARY STATEMENT                                            1

ARTICLE I  DEFINITIONS, ETC.                                      2
      Section 1.01.  Certain Defined Terms                        2
      Section 1.02.  Accounting Terms                             2
      Section 1.03.  Computation of Time Periods                  2
      Section 1.04.  References, Etc.                             2

ARTICLE II  COMMITMENTS AND TERMS OF CREDIT                       2
      Section 2.01.  Commitments                                  2
      Section 2.02.  Borrowing Procedures; Conversions            3
      Section 2.03.  Issuing and Reimbursing the Letters
                       of Credit                                  5
      Section 2.04.  Borrowing Base                               7
      Section 2.05.  The Notes                                    9
      Section 2.06.  Reduction of the Commitments                 9
      Section 2.07.  Mandatory Repayment of Loans                 9
      Section 2.08.  Interest Accrual, Payments                   10
      Section 2.09.  Optional Prepayments                         12
      Section 2.10.  Payments, Notice of Certain Repayments
                           and Computations                       12
      Section 2.11.  Fees                                         13
      Section 2.12.  Setoff, Counterclaims and Taxes              14
      Section 2.13.  Funding Losses                               16
      Section 2.14.  Change of Law                                17
      Section 2.15.  Increased Costs                              18

ARTICLE III  CONDITIONS  OF  CREDIT                               19
      Section 3.01.  Conditions Precedent to Effectiveness,
                           the Initial Borrowing                  19
      Section 3.02.  Conditions Precedent to All Letters of
                           Credit and Loans                       22

ARTICLE IV  REPRESENTATIONS  AND  WARRANTIES                      22
      Section 4.01.  Corporate Existence                          23
      Section 4.02.  Corporate Authority; Binding Obligations     23
      Section 4.03.  No Conflict                                  23
      Section 4.04.  No Consent                                   23
      Section 4.05.  No Defaults or Violations of Law             24
      Section 4.06.  Financial Position                           24
      Section 4.07.  Litigation                                   24
      Section 4.08.  Use of Proceeds                              24
      Section 4.09.  Governmental Regulation                      25
      Section 4.10.  Disclosure                                   25

HOU04:43581.4


<PAGE>



            Section 4.11.  ERISA                                  25
      Section 4.12.  Payment of Taxes                             26
      Section 4.13.  Title and Liens                              26
      Section 4.14.  Gas Imbalances                               27
      Section 4.15.  Environmental Matters                        27

ARTICLE V  AFFIRMATIVE COVENANTS                                  27
      Section 5.01.  Reporting Requirements                       28
      Section 5.02.  Taxes; Claims                                30
      Section 5.03.  Compliance with Laws                         30
      Section 5.04.  Insurance                                    30
      Section 5.05.  Corporate Existence                          31
      Section 5.06.  Inspections                                  31
      Section 5.07.  Maintenance of Properties                    31
      Section 5.08.  Accounting Systems                           32
      Section 5.09.  Use of Loans                                 32
      Section 5.10.  Reserve Reports                              32
      Section 5.11.  Title                                        34
      Section 5.12.  Additional Collateral                        34
      Section 5.13.  Further Assurances in General                34
      Section 5.14.  Enforcement of Acquisition Documents         34

ARTICLE VI  NEGATIVE COVENANTS                                    35
      Section 6.01.  Indebtedness Restriction                     35
      Section 6.02.  Lien Restriction                             36
      Section 6.03.  Derivatives                                  38
      Section 6.04.  Interest Coverage Ratio                      38
      Section 6.05.  Current Ratio                                38
      Section 6.06.  Tangible Net Worth                           38
      Section 6.07.  Sales of Assets                              38
      Section 6.08.  Consolidation and Mergers                    38
      Section 6.09.  Restricted Disbursements                     39
      Section 6.10.  Lines of Business                            39
      Section 6.11.  Transactions with Affiliates                 40

ARTICLE VII  DEFAULT AND REMEDIES                                 40
      Section 7.01.  Events of Default                            40
      Section 7.02.  Setoff in Event of Default                   43
      Section 7.03.  No Waiver; Remedies                          43
      Section 7.04.  Hydrocarbon Proceeds                         43
      Section 7.05.   Application of Proceeds After Acceleration  44

ARTICLE VIII  THE AGENT                                           45
      Section 8.01.  Authorization and Action                     45
      Section 8.02.  Reliance, Etc.                               46
      Section 8.03.  BTCo and Affiliates                          46
      Section 8.04.  Bank Credit Decision                         47

HOU04:43581.4


<PAGE>



      Section 8.05.  Indemnification                              47
      Section 8.06.  Employees of the Agent and the Issuing Bank  48
      Section 8.07.  Successor Agent                              48
      Section 8.08.  Successor Co-Agent and Successor
                       Issuing Bank                               49
      Section 8.09.  Notice of Default                            50
      Section 8.10.  Execution of Loan Documents                  50

ARTICLE IX  MISCELLANEOUS                                         50
      Section 9.01.  Amendments, Etc.                             50
      Section 9.02.  Participation Agreements and Assignments     51
      Section 9.03.  Notices                                      53
      Section 9.04.  Costs and Expenses                           54
      Section 9.05.  Successors and Assigns                       55
      Section 9.06.  Independence of Covenants                    55
      Section 9.07.  Survival of Representations and Warranties   55
      Section 9.08.  Separability                                 55
      Section 9.09.  Captions                                     55
      Section 9.10.  Counterparts                                 55
      Section 9.11.  Governing Law                                56
      Section 9.12.  Submission to Jurisdiction                   56
      Section 9.13.  Limitation on Interest                       56
      Section 9.14.  Indemnification                              57
      Section 9.15. Ratification of Security Documents            58
      Section 9.16.  Confidentiality                              58
      Section 9.17.  Final Agreement of the Parties               59

Exhibits and Schedules

      Exhibit 2.02(a)  Form of Borrowing Request
      Exhibit 2.02(c)  Form of Conversion Notice
      Exhibit 2.03     Form of Letter of Credit Request
      Exhibit 2.05     Form of Revolving Note
      Exhibit 9.02      Form of Assignment and Acceptance Agreement

      Schedule 4.01    List of Borrower's Subsidiaries
      Schedule 4.04    Consents
      Schedule 4.07    Litigation
      Schedule 4.13    Titles and Liens
      Schedule 4.14    Gas Imbalances
      Schedule 6.01    Indebtedness


HOU04:43581.4


<PAGE>




                       THIS AMENDED AND RESTATED CREDIT
AGREEMENT dated as of November 14, 1996 is among ABRAXAS PETROLEUM  CORPORATION,
a Nevada  corporation (the  "Borrower"),  the banks named on the signature pages
hereto (together with their respective  successors and assigns in such capacity,
the "Banks"),  and BANKERS TRUST COMPANY,  as agent for the Banks (together with
its successors and assigns in such  capacity,  the "Agent"),  and as the issuing
bank with respect to the Letters of Credit issued  hereunder  (together with its
successors and assigns in such  capacity,  the "Issuing  Bank"),  and ING (U.S.)
CAPITAL CORPORATION (formerly known as Internationale Nederlanden (U.S.) Capital
Corporation),  as  co-agent  for the Banks  (together  with its  successors  and
assigns in such capacity, the "Co-Agent").  Unless otherwise defined herein, all
capitalized  terms used  herein and  defined in Article I are used  herein as so
defined.

                         PRELIMINARY STATEMENT

                       A. The  Borrower,  the Agent and the Banks  entered  into
that certain  Credit  Agreement  dated as of September  30, 1996 (the  "Original
Credit  Agreement")  whereby  the  Banks  agreed  to make  certain  loans to the
Borrower.

                       B.  Bankers  Trust  Company has assigned a portion of its
rights and  obligations  under the  Original  Credit  Agreement to Union Bank of
California,  N.A.,  pursuant to that certain  Assignment  and  Acceptance  dated
November 13, 1996.

                       C.  In  connection  with  the  consummation  of the  Bond
Offering (as defined  herein) the Borrower has paid  contemporaneously  with the
effectiveness  of this  Agreement  all amounts  outstanding  under the  Original
Credit Agreement.

                       D. The Borrower,  the Agent and the Banks desire to amend
and restate the Original Credit Agreement in its entirety,  to provide for among
other  things,  the  modification,  extension  and  renewal  of  the  "Revolving
Commitments"  under the Original  Credit  Agreement,  which are the  Commitments
referred to herein.

                       Accordingly,  in  consideration  of the foregoing and the
mutual  covenants set forth herein,  the parties agree that the Original  Credit
Agreement is hereby amended and restated in its entirety to read as follows:


HOU04:43581.4


<PAGE>



                               ARTICLE I
                           DEFINITIONS, ETC.

                       Section 1.01.  Certain Defined Terms.  Capitalized  terms
used  in this  Agreement  and not  otherwise  defined  herein,  shall  have  the
respective  meanings  set forth in Annex A hereto  (such  meanings to be equally
applicable to both singular and plural forms of the terms defined).

                       Section 1.02.  Accounting Terms. All accounting terms not
specifically  defined  herein shall be construed in  accordance  with  generally
accepted accounting  principles consistent with those applied in the preparation
of the consolidated financial statements referred to in Section 4.06.

                       Section  1.03.  Computation  of  Time  Periods.  In  this
Agreement in the computation of periods of time from a specified date to a later
specified  date,  the word "from" means "from and  including" and the words "to"
and "until" each means "to but excluding."

                       Section  1.04.  References,   Etc.  The  words  "hereof,"
"herein" and "hereunder" and words of similar import when used in this Agreement
shall refer to this Agreement as a whole and not to any particular  provision of
this  Agreement.  All  references  herein to  Sections,  Annexes,  Exhibits  and
Schedules shall, unless the context requires a different construction, be deemed
to be references to the Sections of this Agreement and the Annexes, Exhibits and
Schedules  attached hereto and made a part hereof.  In this Agreement,  unless a
clear contrary  intention  appears the word  "including"  (and with  correlative
meaning  "include")  means  including,  without  limiting the  generality of any
description  preceding  such  term.  No  provision  of this  Agreement  shall be
interpreted  or construed  against any Person solely  because that Person or its
legal representative drafted such provision.



HOU04:43581.4


<PAGE>



                               ARTICLE II
                    COMMITMENTS AND TERMS OF CREDIT

                       Section 2.01.  Commitments.  (a) (i)  Each Bank severally
agrees,  on the terms and conditions  hereinafter set forth, to make one or more
loans (the "Loans") to the Borrower from time to time on any Business Day during
the period from the Effective Date up to, but excluding, the Maturity Date in an
aggregate  amount  outstanding for such Bank not to exceed at any time an amount
equal to such Bank's  Commitment.  Each Loan shall be made as either a Base Rate
Loan or a  Eurodollar  Rate Loan and as part of a single  Borrowing  made on the
same  day  by  the  Banks  ratably  according  to  their  respective  Commitment
Percentages.  Each Base Rate Borrowing shall be in an aggregate  amount not less
than  $2,000,000,  or,  if  less,  the  entire  unfunded  portion  of the  Total
Commitment.  Each Eurodollar Rate Borrowing shall be in an aggregate  amount not
less than  $2,000,000 or an integral  multiple of $1,000,000 in excess  thereof.
Within the limits set forth  above and  subject to the terms and  conditions  of
this  Agreement,  the  Borrower  may borrow,  repay  pursuant to Section 2.07 or
prepay pursuant to Section 2.09 and reborrow under this Section 2.01(a).

                       (ii) The Issuing Bank agrees, on the terms and conditions
hereinafter set forth, to issue standby or commercial  letters of credit for the
account of the Borrower  (the  "Letters of Credit") from time to time on any one
or more  Business  Days  during the period  from the  Effective  Date up to, but
excluding,  the ninetieth (90th) day preceding the Maturity Date in an aggregate
amount  for all  Outstanding  Letters of Credit  not  exceeding  at any time the
Letter of Credit Limit.  Each Letter of Credit shall be  denominated in Dollars,
shall expire no later than the date set forth in Section  2.03(a),  and shall be
in such form as approved from time to time by the Issuing Bank and the Borrower.
Each Bank severally agrees,  on the terms and conditions  hereinafter set forth,
to purchase  participations  in the Letters of Credit issued by the Issuing Bank
pursuant  to  this  Agreement  in an  amount  equal  to such  Bank's  Commitment
Percentage  of the face  amount of such Letter of Credit.  Upon the  issuance of
each Letter of Credit, the Issuing Bank shall be deemed,  without further action
by any party hereto,  to have sold to each Bank,  and each Bank shall be deemed,
without  further action by any party hereto,  to have purchased from the Issuing
Bank, a participation,  to the extent of such Bank's Commitment  Percentage,  in
such Letter of Credit, the obligations of the Issuing Bank thereunder and in the
reimbursement  obligations of the Borrower due in respect of drawings made under
such  Letter of Credit.  Subject to the terms of the Loan  Documents,  the Banks
will  execute any other  documents  the Issuing Bank may  reasonably  request to
evidence  the  purchase  of such  participation.  On each day  during the period
commencing  with the  issuance by the  Issuing  Bank of any Letter of Credit and
ending on the date  when  such  Letter of  Credit  shall  have  expired  or been
terminated,  and,  irrespective  of whether such Letter of Credit has expired or
terminated  if such Letter of Credit has been drawn upon and the amount so drawn
has not been  reimbursed to the Issuing Bank,  the Commitment of each Bank shall
be deemed to be  utilized  for all  purposes  hereof in an amount  equal to such
Bank's Commitment Percentage of the Outstanding Letters of Credit.

HOU04:43581.4


<PAGE>



                       (iii)  Notwithstanding any other term or provision hereof
(A) no Loan  shall be made and no  Letter  of  Credit  shall be  issued if after
giving  effect to the making of such Loan or  issuance  of such Letter of Credit
the aggregate amount of Credit Outstanding would exceed the Total Commitment and
(B) no Letter of Credit shall be issued if after  giving  effect to the issuance
of such Letter of Credit the aggregate  amount of Outstanding  Letters of Credit
would exceed the Letter of Credit Limit.

                       (b) Loans of more than one Type may be outstanding at the
same time, but the Borrower shall not be entitled to request any Borrowing or to
Convert  Loans  comprising  any  Borrowing  into Loans of another Type, if after
giving  effect to such  Borrowing  or  Conversion,  as the case may be, any Bank
would have outstanding (i) at any one time more than four (4) different Types of
Loans.  Loans having  different  Interest  Periods,  regardless  of whether they
commence  on the same  date or have the same  type of  interest  rate,  shall be
considered different Types of Loans; provided, however, that all Base Rate Loans
are the same type of Loan so long as they remain Base Rate Loans.

                       Section 2.02. Borrowing Procedures;  Conversions. (a) (i)
Each  Borrowing  shall  be  made  upon  the  written,  telecopied  or  facsimile
transmitted  request  of the  Borrower,  given to the Agent not later than 11:00
a.m.  (New  York  time) on (A) the  third  Business  Day  prior to the  proposed
Borrowing Date in the case of a Eurodollar Rate  Borrowing,  or (B) the Business
Day immediately preceding the proposed Borrowing Date in the case of a Base Rate
Borrowing,  and the Agent shall give each other  member of the Bank Group prompt
notice of such request by telecopier, telex or cable.

                       (ii) Each request for a Borrowing (a "Borrowing Request")
      made by the  Borrower  shall  be in  substantially  the  form  of  Exhibit
      2.02(a), specifying therein (A) the Borrowing Date for such Borrowing, (B)
      the Type of Loans  comprising such Borrowing,  (C) the aggregate amount of
      such  Borrowing and (D) in the case of a Eurodollar  Rate  Borrowing,  the
      Interest Period for the Loans comprising such Borrowing.  Each Bank shall,
      before  12:00  Noon (New York  time) on the date of such  Borrowing,  make
      available for the account of its Applicable Lending Office to the Agent at
      its address  referred to in Section 9.03,  in same day funds,  such Bank's
      ratable portion of such Borrowing. After the Agent's receipt of such funds
      and upon  fulfillment  of the  applicable  conditions set forth in Article
      III,  the Agent  will make such funds  available  to the  Borrower  at the
      Agent's aforesaid address. Each Borrowing Request shall be irrevocable and
      binding on the Borrower.

                       (b) Unless the Agent  shall have  received  notice from a
Bank prior to the date of any Borrowing  that such Bank will not make  available
to the Agent such Bank's ratable portion of such Borrowing, the Agent may assume
that such Bank has made such portion  available to the Agent on the date of such
Borrowing in accordance  with  subsection (a) of this Section 2.02 and the Agent
may, in reliance upon such  assumption,  make  available to the Borrower on such
date a corresponding  amount. If and to the extent that such Bank shall not have

HOU04:43581.4


<PAGE>




so made such ratable portion  available to the Agent, such Bank and the Borrower
severally  agree to repay to the Agent  forthwith  on demand such  corresponding
amount, together with interest thereon for each day from the date such amount is
made available to the Borrower until the date such amount is repaid to the Agent
at (i) in the case of the Borrower,  the interest rate applicable at the time to
the Loans  comprising  such  Borrowing  and (ii) in the case of such  Bank,  the
Federal  Funds Rate.  If such Bank shall  repay to the Agent such  corresponding
amount,  such amount so repaid shall constitute such Bank's Loan as part of such
Borrowing  for purposes of this  Agreement,  and  Borrower  shall be relieved of
Borrower's  obligation  to repay such amount  under this  Section  2.02(b).  The
failure  of any Bank to make the Loan to be made by it as part of any  Borrowing
shall not relieve any other Bank of its  obligation,  if any,  hereunder to make
its Loan on the date of such Borrowing or any subsequent  Borrowing Date, but no
Bank shall be responsible  for the failure of any other Bank to make the Loan to
be made by such other Bank on the date of any Borrowing.

                       (c)  The  Borrower  may,  subject  to the  terms  of this
Agreement,   on  any  Business  Day,  upon  written,   telecopied  or  facsimile
transmitted notice to the Agent, given not later than 11:00 a.m. (New York time)
on (i) the third Business Day prior to the proposed  Conversion Date in the case
of a Conversion of Loans into  Eurodollar  Rate Loans,  or (ii) the Business Day
immediately  preceding the proposed  Conversion Date in the case of a Conversion
of Loans into Base Rate Loans,  Convert Loans into Borrowings comprised of Loans
of another  Type,  and the Agent shall  promptly  transmit  the contents of such
notice to each  other  member of the Bank Group by  telecopier,  telex or cable.
Notwithstanding  any other term or provision hereof,  after giving effect to any
such  Conversion,  the size of all  Borrowings  outstanding  hereunder,  and the
number of different Types of Loans outstanding  hereunder,  shall conform to the
requirements  of Section 2.01. In the event of any Conversion of Eurodollar Rate
Loans on any day  other  than the last  day of the  Interest  Period  applicable
thereto,  the Borrower  shall be  obligated  to  reimburse  the Banks in respect
thereof  pursuant to Section 2.13.  Each notice of a Conversion  (a  "Conversion
Notice")  given by the Borrower  shall be in  substantially  the form of Exhibit
2.02(c) hereto,  specifying therein (A) the Conversion Date for such Conversion,
(B) the Loans to be Converted,  (C) the Type of Loans to which such Loans are to
be Converted and (D) in the case of a Conversion into Eurodollar Rate Loans, the
Interest  Period for such Converted  Loans. If the Borrower shall fail to give a
timely  Conversion  Notice conforming to the requirements of this Agreement with
respect to any  Eurodollar  Rate Loans prior to the  expiration  of the Interest
Period applicable  thereto,  such Eurodollar Rate Loans shall,  automatically on
the last day of such Interest Period, be Converted into Base Rate Loans.

                       Section  2.03.  Issuing  and  Reimbursing  the Letters of
Credit. (a) Each Letter of Credit shall, subject to the terms of this Agreement,
be issued  upon the written or  facsimile  transmitted  request (an  original of
which shall be immediately  forwarded by overnight  courier to the Issuing Bank)
of the Borrower  given to the Agent not later than 11:00 a.m. (New York time) on
the third  Business Day prior to the proposed date of issuance of such Letter of

HOU04:43581.4


<PAGE>



Credit.  Each such request for a Letter of Credit (a "Letter of Credit Request")
made by the Borrower shall be in  substantially  the form of Exhibit 2.03 hereto
and shall  specify  the  Business  Day on which  such  Letter of Credit is to be
issued,  the beneficiary of such Letter of Credit,  the amount of such Letter of
Credit,  the draw conditions  applicable thereto and shall provide for an expiry
date which is not later than thirty days prior to the Maturity Date.

                       (b)  Upon   satisfaction  of  the  applicable  terms  and
conditions set forth in Article III, the Issuing Bank shall issue such Letter of
Credit to the  specified  beneficiary  not later than the close of business (New
York time) on the date so  specified.  The Issuing Bank shall provide each other
member of the Bank Group with a copy of each Letter of Credit so issued, but any
failure of the Issuing  Bank to provide  such Persons with a copy of such Letter
of Credit shall not in any way affect the Borrower's obligation to reimburse the
Issuing  Bank for any amount paid by the Issuing Bank under any Letter of Credit
or the Banks'  obligation to reimburse the Issuing Bank for such amount,  to the
extent  provided  herein,  in the event the  Borrower  fails to do so. Each such
Letter of Credit  shall (i)  provide for the payment of drafts or other forms of
payment to be presented for honor  thereunder by the  beneficiary  in accordance
with the terms thereon,  at sight when  accompanied  by the documents  described
therein and (ii) be subject to the Uniform  Customs and Practice for Documentary
Credits (1993 Revision),  International Chamber of Commerce Publication No. 500,
(and  any  subsequent   revisions   thereof   approved  by  a  Congress  of  the
International  Chamber of  Commerce  and  adhered to by the  Issuing  Bank) (the
"UCP") and shall,  as to matters not  governed  by the UCP, be governed  by, and
construed and  interpreted  in accordance  with,  the governing law specified in
this Agreement.

                       (c) Upon presentment to the Issuing Bank of any draft for
honor  under  any  Letter  of  Credit  by  the   beneficiary   thereof  and  the
determination  by the Issuing Bank that such draft is in order, the Issuing Bank
shall give prompt notice (a  "Reimbursement  Notice") to the Borrower of (i) the
Letter of Credit to which such Reimbursement Notice relates, (ii) the amounts to
be paid on account of such draft (the "Reimbursement Amount") and (iii) the date
on which such amounts are to be paid (the "Reimbursement Date"), but any failure
to so notify the Borrower shall not in any way affect the Borrower's obligations
to reimburse  the Issuing Bank for any amount paid by the Issuing Bank under any
Letter of Credit.

                       (d)  Upon  receipt  of  any  Reimbursement   Notice,  the
Borrower shall  reimburse the Issuing Bank by forthwith  paying to the Agent for
the benefit of the Issuing Bank (who shall  promptly  notify the Issuing Bank of
such payment) no later than 10:00 a.m. (New York time) on the Reimbursement Date
specified  in such  Reimbursement  Notice an amount  equal to the  Reimbursement
Amount specified in such Reimbursement  Notice,  and, if the Issuing Bank is not
fully  reimbursed  by the Borrower on such  Reimbursement  Date,  together  with
interest from such  Reimbursement  Date until such  reimbursement is made by the
Borrower at a fluctuating  rate per annum equal to the lesser of (i) the Highest
Lawful Rate and (ii) the Base Rate in effect during the time such  reimbursement

HOU04:43581.4


<PAGE>




obligation  remains unpaid plus the  Applicable  Margin for Base Rate Loans from
such Reimbursement  Date until the third day immediately  following the delivery
of such Reimbursement Notice by the Issuing Bank to Borrower and (B) thereafter,
the Default Rate. To the extent availability may then exist, and upon compliance
with the relevant terms and conditions of this Agreement, the Borrower may repay
any or all of the  obligations  described  in this  paragraph  by  requesting  a
Borrowing and applying the proceeds thereof accordingly.

                       (e)   If the Borrower shall fail to reimburse the Issuing
Bank for any payment by the Issuing Bank under a Letter of Credit by 12:00 noon.
(New York time) on the Reimbursement Date specified in the Reimbursement  Notice
related thereto, the Agent shall give prompt notice thereof to each other member
of the Bank Group. Upon receipt of such notice, each Bank shall, notwithstanding
any other provision of this Agreement  (including the occurrence and continuance
of a  Default  or an Event of  Default),  make  available  to the  Agent for the
benefit of the Issuing Bank an amount equal to its Commitment  Percentage of the
Reimbursement Amount specified in the related Reimbursement Notice no later than
the close of business on such Reimbursement  Date. If such amount is not in fact
made available to the Agent by such Bank on such  Reimbursement  Date, such Bank
shall pay to the Agent for the  account of the Issuing  Bank,  on demand made by
the Issuing  Bank,  in addition to such amount,  interest on such amount for the
number of days that elapse from such Reimbursement Date to the date on which the
amount equal to such Bank's Commitment  Percentage of such Reimbursement  Amount
becomes  immediately  available to the Issuing Bank at a rate per annum equal to
the average daily Federal Funds Rate for such days.  Any amount  received by the
Agent or the Issuing Bank from the Borrower in respect of a draft  honored under
a Letter of Credit after one or more of the Banks have made funds  available for
the payment of such draft pursuant to this  paragraph  shall be paid over by the
Agent or the Issuing Bank, as the case may be, to the Banks,  pro rata according
to the amounts so made  available  by the Banks,  promptly  upon  receipt by the
Agent or the  Issuing  Bank of such  amount.  Nothing  in this  Agreement  shall
diminish the Borrower's obligation under this Agreement to provide the funds for
the payment of, or on demand to  reimburse  the Issuing Bank for payment of, any
draft  presented  to, and duly  honored by, the Issuing Bank under any Letter of
Credit.

                       (f) In order to induce the  issuance of Letters of Credit
by the Issuing Bank and the purchase of participations therein by the Banks, the
Borrower irrevocably agrees (i) that the obligation of the Borrower to reimburse
the  Issuing  Bank for  amounts  paid by the  Issuing  Bank  under any Letter of
Credit,  including accrued interest thereon, as set forth herein is absolute and
unconditional,  (ii) that no member of the Bank Group  shall be  responsible  or
liable for, and the Borrower's unconditional obligation to reimburse the Issuing
Bank through the Agent for amounts paid by the Issuing Bank on account of drafts
honored under the Letters of Credit shall not be affected by, any  circumstance,
act or  omission  whatsoever  relating  to any Letter of Credit,  whether or not
known to any member of the Bank Group, unless such circumstance, act or omission
results in the wrongful payment or the wrongful dishonor of any Letter of Credit

HOU04:43581.4


<PAGE>




or is otherwise the result of the gross negligence or willful misconduct of such
member of the Bank Group,  (iii) that any action taken or omitted to be taken by
any member of the Bank Group under or in connection with any Letter of Credit or
any related  draft,  document or property  shall be binding on the  Borrower and
shall not put any member of the Bank Group under any resulting  liability to the
Borrower,  unless such action or omission results in the wrongful payment or the
wrongful  dishonor  of any  Letter of Credit or  otherwise  is the result of the
gross negligence or willful misconduct of such member of the Bank Group and (iv)
to  indemnify,  defend and hold each member of the Bank Group  harmless from and
against  any  and  all  liabilities,  damages,  claims  or  reasonable  expenses
(including  reasonable  attorneys' fees and amounts paid in settlement)  arising
out of or based on any  Letter of  Credit,  except to the extent the same is the
result of the wrongful payment or the wrongful  dishonor of any Letter of Credit
or is otherwise the result of the gross negligence or willful  misconduct of the
Person  seeking  indemnity  hereunder,  IT BEING THE  EXPRESS  INTENTION  OF THE
BORROWER  THAT  EACH  MEMBER OF THE BANK  GROUP  SHALL BE  INDEMNIFIED  AND HELD
HARMLESS AGAINST ANY AND ALL LIABILITIES, CLAIMS, OR REASONABLE EXPENSES ARISING
OUT OF OR RESULTING FROM THE ORDINARY  NEGLIGENCE (WHETHER SOLE OR CONTRIBUTORY)
OF SUCH MEMBER OF THE BANK GROUP.  The Borrower  hereby waives  presentment  for
payment and notice of  dishonor,  protest and notice of protest  with respect to
drafts honored under the Letters of Credit.

                       (g) The  provisions of this  Agreement and the other Loan
Documents concerning collateral, standard of care of the Issuing Bank, timing of
payments,  interest rates applicable to any reimbursement obligation relating to
any Letter of Credit,  any  representations,  warranties,  covenants,  events of
default,  remedies  and  governing  law shall  supersede  in their  entirety the
provisions of any Letter of Credit application  relating to such matters. In the
event any other  provision of any Letter of Credit  application is  inconsistent
with, or in conflict of any provision of this  Agreement or any Loan  Documents,
the provisions of this Agreement or the Loan Documents shall govern.

                       Section 2.04.  Borrowing  Base. (a) The Borrowing Base in
effect  from time to time shall  represent  the maximum  amount  (subject to the
Total Commitment) of Loans that the Banks will make to the Borrower.  During the
period  from  and  after  the  Effective   Date  until  the  Borrowing  Base  is
redetermined in accordance  with this Section,  the amount of the Borrowing Base
shall be $20,000,000.  The Borrowing Base shall be determined in accordance with
Section  2.04(b) by the Agent and  approved by all of the Banks or the  Majority
Banks,  as  applicable.  The  Borrowing  Base is subject to  redetermination  in
accordance with Section 2.04(d). Upon any redetermination of the Borrowing Base,
such redetermination  shall remain in effect until the next successive date that
the  redetermined  Borrowing  Base  becomes  effective  subject  to  the  notice
requirements specified in Section 2.04(e) for both the scheduled redetermination
and unscheduled redeterminations.  So long as any part of the Commitments are in
effect and until all of the Loans  outstanding  hereunder are paid in full, this
Agreement shall be governed by the then effective Borrowing Base.

HOU04:43581.4


<PAGE>





                       (b) The  Agent  will  after  receipt  of the most  recent
Reserve  Report  delivered to the Banks under Section 5.10,  and such other data
and supplemental information as may from time to time be reasonably requested by
the  Agent,  but in no  event  later  than  May 1 and  November  1 of each  year
commencing  May 1, 1997,  redetermine  the Borrowing  Base based on such Reserve
Report.  The  Agent  and  each  Bank  will  redetermine  the  Borrowing  Base in
accordance  with their  respective  normal  and  customary  oil and gas  lending
criteria as such exist at that  particular  time taking into  account all of the
assets and liabilities of the Borrower and its Subsidiaries.  The Agent and each
Bank, in their sole  discretion,  may make reasonable  adjustments to the rates,
volumes and prices and other  assumptions  set forth in the Reserve  Reports and
such  other  data and  supplemental  information.  Each  redetermination  of the
Borrowing  Base which would  increase the Borrowing Base must be approved by all
of the  Banks,  and each other  redetermination  of the  Borrowing  Base must be
approved by the Majority Banks. Failure of a Bank to object to a redetermination
within 14 days after notice of such redetermination is given to such Bank by the
Agent shall be deemed an approval of such redetermination by such Bank.

                       (c) The Agent may  exclude  any Oil and Gas  Property  or
portion of production  therefrom from the Borrowing  Base, at any time,  because
the status of title to such Oil or Gas Property is not  reasonably  satisfactory
to Agent or because such Oil and Gas Property is not subject to a first priority
lien in favor of the Agent as security for the Obligations.

                       (d) So long as any of the  Commitments  are in effect and
until  payment in full of all Loans  hereunder,  effective on or about May 1 and
November  1 of each  year  commencing  May 1,  1997  (each  being  a  "Scheduled
Redetermination  Date"),  the Agent with the approval of all of the Banks or the
Majority  Banks,  as applicable,  shall  redetermine the amount of the Borrowing
Base in  accordance  with Section  2.04(b).  In addition,  at any time after the
first   scheduled   Redetermination   Date,  (i)  the  Borrower  may  request  a
redetermination  of the  Borrowing  Base on its own  initiation  at any  time in
connection  with a proposed  acquisition of Oil and Gas  Properties  with a fair
market  value in excess of  $10,000,000  and at one  additional  time during any
consecutive  twelve (12) month period, and (ii) the Agent and Majority Banks may
each initiate a  redetermination  of the  Borrowing  Base at any time as they so
elect;  provided,  however,  that the Agent and Majority Banks may each initiate
only one such  unscheduled  redetermination  during any consecutive  twelve (12)
month  period  (each  being  an   "Unscheduled   Redetermination   Date").   Any
redetermination  of the Borrowing  Base on an Unscheduled  Redetermination  Date
shall be in accordance with Section 2.04(b).

                       (e) The  Agent  shall  promptly  notify  in  writing  the
Borrower and the Banks of the new Borrowing  Base. Such  redetermination  of the
Borrowing Base shall not be in effect until notice is given to the Borrower.


HOU04:43581.4


<PAGE>



                       Section  2.05.  The  Notes.  The Loans  made by each Bank
shall be  evidenced  by a single Note issued to such Bank by the  Borrower,  (i)
dated the date of this  Agreement  (or such  other date as may be  specified  in
Section  9.02),  (ii)  payable to the order of such Bank in a  principal  amount
equal to such Bank's Commitment  Percentage of the Aggregate Maximum  Commitment
and (iii) otherwise duly completed. Each Loan made by a Bank to the Borrower and
all payments made on account of the principal amount thereof shall be entered by
such Bank in its records or on the schedule (or a continuation thereof) attached
to the Note of such Bank, provided, that prior to any transfer of any such Note,
such Bank shall endorse the amount and maturity of any outstanding  Loans on the
schedule (or a continuation thereof) attached to such Note.

                       Section  2.06.  Reduction  of the  Commitments.  (a)  The
Borrower shall have the right,  upon at least three Business Days' notice to the
Agent to terminate in whole or reduce ratably in part the unused portions of the
Aggregate  Maximum  Commitment;  provided,  that each  partial  reduction in the
Aggregate  Maximum  Commitment shall be in the aggregate amount of $1,000,000 or
an integral  multiple of $1,000,000  in excess  thereof.  Any such  reduction or
termination shall be irrevocable by the Borrower.

                       (b) On  each  Commitment  Reduction  Date,  the  Reducing
Commitment  Amount shall  automatically be reduced by an amount equal to 8.2% of
the Reducing Commitment Amount as of the first Commitment Reduction Date. On the
Maturity  Date the  Commitment  of each Bank shall  automatically  be reduced to
zero.

                       Section  2.07.  Mandatory  Repayment  of  Loans.  (a) The
Borrower  shall  from time to time repay the Loans  comprising  part of the same
Borrowing or provide cover for Outstanding  Letters of Credit in such amounts as
shall be necessary so that at all times the Credit  Outstanding  shall not be in
excess of the Total Commitment.  Except to the extent that repayment or cover is
required to be made in three equal monthly  installments  under Section 2.07(b),
any repayment or cover required by this Section 2.07(a) shall be due and payable
on the date such repayment or cover obligation accrues pursuant to the preceding
sentence.

                       (b) The Borrower  shall from time to time repay the Loans
comprising part of the same Borrowing or provide cover for  Outstanding  Letters
of Credit (as provided  below) in whole or ratably in part in an amount equal to
the  excess  of (i) the  Credit  Outstanding  as of any  redetermination  of the
Borrowing  Base pursuant to Section 2.04 over (ii) the Borrowing Base as of such
date. Any repayment or cover  required by this Section  2.07(b) shall be due and
payable in three  equal  monthly  installments,  each in an amount  equal to one
third (1/3rd) of the original amount of such excess,  commencing on the last day
of  the  calendar  month  immediately  following  such  redetermination  of  the
Borrowing Base and continuing on the same day of each subsequent calendar month.


HOU04:43581.4


<PAGE>



                       (c) In the  event  that the  Borrower  shall be  required
pursuant to this  Section 2.07 to repay Loans or provide  cover for  Outstanding
Letters of Credit, the Borrower shall make such repayment and provide such cover
in the following order:  (i) first, pay the amount of all unreimbursed  drawings
under the Letters of Credit,  (ii) second,  repay the principal of the Loans and
(iii) third,  provide  cover for Letters of Credit.  Cover for Letters of Credit
shall be effected by paying to the Agent immediately available funds, to be held
by the Agent in an account under the sole dominion and control of the Agent, for
the benefit of the Bank Group,  as security for the  obligations of the Borrower
under the Loan Documents until the earlier of (A) the occurrence in this Section
2.07  which  necessitated  such  cover no longer  exists or (B) such time as the
Letters of Credit have been  terminated  and all  obligations of the Borrower to
the Bank Group (including the Issuing Bank) in respect thereof have been paid in
full,  at which  time the  Agent  shall  remit  the  amount  of such  cover,  in
immediately  available  funds,  at the direction or instruction of the Borrower.
Any funds  delivered  pursuant to the preceding  sentence  shall be placed in an
interest  bearing  account  selected  by the Agent and so long as no Default has
occurred  and is  continuing,  any  accrued  interest  on such  funds  shall  be
distributed monthly to the Borrower.

                       (d) All outstanding  Loans shall be fully due and payable
on the Maturity Date, together with any unpaid interest accrued thereon.

                       (e) Each repayment of Loans required by this Section 2.07
shall be accompanied by payment of accrued  interest to the date of such payment
on the principal  amount paid. In the event of any payment of a Eurodollar  Rate
Loan, the Borrower shall be obligated to reimburse the Banks in respect  thereof
pursuant to Section 2.13. All principal  payments  required by this Section 2.07
shall first be applied to Base Rate  Borrowings,  and second to Eurodollar  Rate
Borrowings.

                       Section 2.08. Interest Accrual, Payments. (a) Accrual and
Payment.  Subject to the  provisions  of Section  9.13,  the Borrower  shall pay
interest on the unpaid  principal amount of each Loan made by each Bank from the
date of such Loan  until such  principal  amount  shall be paid in full,  on the
dates and at the rates per annum specified as follows:

                       (i) Base Rate Loans.  If such Loan is a Base Rate Loan, a
rate per annum equal at all times to the lesser of (A) the  Highest  Lawful Rate
and (B) the Base Rate in effect from time to time plus the Applicable  Margin in
effect from time to time, and unpaid accrued interest on such Loans shall be due
and payable on each  Quarterly  Payment Date and on the date such Base Rate Loan
shall be paid in full;  provided,  however,  that if the  Borrower  has not been
notified  by the  Agent of the  amount  of such  accrued  interest  at least one
Business Day prior to such date, such accrued  interest shall be due and payable
one Business Day after the Borrower is notified of such amount.  (ii) Eurodollar
Rate Loans.  If such Loan is a  Eurodollar  Rate Loan, a rate per annum equal at

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<PAGE>




all times  during  the  Interest  Period  for such Loan to the lesser of (A) the
Highest  Lawful Rate and (B) the sum of the  Eurodollar  Rate for such  Interest
Period plus the Applicable Margin in effect as of the first day of such Interest
Period,  and unpaid  accrued  interest on such Loans shall be due and payable on
the last day of such Interest Period;  provided,  however,  that if the Borrower
has not been  notified  by the Agent of the amount of such  accrued  interest at
least one Business Day prior to such date,  such accrued  interest  shall be due
and payable one Business Day after the Borrower is notified of such amount.

Any amount of principal or, to the extent permitted by applicable law,  interest
which is not paid when due  (whether  at stated  maturity,  by  acceleration  or
otherwise)  shall bear  interest from the date on which such amount is due until
such  amount  is paid in full,  at a rate per  annum  equal at all  times to the
lesser of (A) the Highest  Lawful Rate and (B) the Base Rate in effect from time
to time during the applicable  period plus the Applicable  Margin in effect from
time to time during such period  plus two  percent  (2%) (the  "Default  Rate"),
payable on demand.

                       (b)  Determination of Interest Rates. (i) The Agent shall
give prompt  notice to the  Borrower  and each other member of the Bank Group of
the  applicable  interest  rate  determined  by the  Agent  hereunder  for  each
Borrowing.  Each  determination by the Agent of an interest rate hereunder shall
be conclusive and binding for all purposes, absent manifest error.

                       (ii) If the Majority  Banks shall,  at least one Business
Day before the date of any requested Eurodollar Rate Borrowing, notify the Agent
that the  Eurodollar  Rate  applicable  to such  Borrowing  will not  adequately
reflect  the  cost to  such  Banks  of  making,  funding  or  maintaining  their
respective  Eurodollar Rate Loans for such Borrowing,  the right of the Borrower
to select  Eurodollar Rate Loans for such Borrowing or any subsequent  Borrowing
shall be  suspended  until the Agent shall  notify the  Borrower  and each other
member of the Bank Group  that the  circumstances  causing  such  suspension  no
longer  exist,  and each Loan  comprising  such  Borrowing  shall be made as, or
Converted into, as applicable, a Base Rate Loan.

                       (c) Applicable  Margin. As used in this Agreement and the
other Loan Documents,  "Applicable  Margin" means,  as to Loans  consisting of a
single Borrowing,  a rate per annum determined by reference to the Type of Loans
comprising such Borrowing as follows:

                       (i) if the aggregate  amount of Loans  outstanding  as of
      the date of  determination  is equal to or greater than 66.7% of the Total
      Commitment as of such date,  then such rate per annum shall be one-half of
      one  percent  (1/2%)  for  Base  Rate  Loans,  and two  percent  (2%)  for
      Eurodollar Rate Loans;

                       (ii)   if the aggregate amount of Loans outstanding as

HOU04:43581.4


<PAGE>



      of the date of  determination  is equal to or greater  than 33.3% but less
      than 66.7% of the Total  Commitment  as of such date,  such rate per annum
      shall be one-half  of one  percent  (1/2%) for Base Rate Loans and one and
      three-quarters (1 3/4%) for Eurodollar Rate Loans; and
                        (iii) if the aggregate amount of Loans outstanding as of
      the date of determination is less than 33.3% of the Total Commitment as of
      such date, such rate per annum shall be one-half of one percent (1/2%) for
      Base Rate Loans,  and one and one-quarter  percent (1 1/4%) for Eurodollar
      Rate Loans.

                       Section 2.09.  Optional Prepayments.  (a) The Borrower
may, from time to time on any Business Day, upon notice to the Agent stating the
proposed  date and aggregate  principal  amount  thereof,  and if such notice is
given the Borrower shall,  prepay the outstanding  principal  amount of the Base
Rate Loans (without premium or penalty) comprising part of the same Borrowing in
whole or ratably in part;  provided,  that any partial  prepayment  of such Base
Rate Loans shall be in an aggregate  principal amount of not less than $500,000.
The Borrower may from time to time upon at least three  Business Days' notice to
the Agent stating the proposed date and the aggregate  principal amount thereof,
and if such notice is given the Borrower shall, prepay the outstanding principal
amount of the  Eurodollar  Rate Loans  comprising  part of the same Borrowing in
whole  or  ratably  in  part;  provided,  that any  partial  prepayment  of such
Eurodollar Rate Loans shall be in an aggregate principal amount of not less than
$500,000 or an integral multiple of $100,000 in excess thereof.

                       (b)    Each prepayment of Loans made pursuant to this
Section 2.09 shall be accompanied  by a payment of accrued  interest to the date
of  such  prepayment  on the  principal  amount  prepaid.  In the  event  of any
prepayment  of a  Eurodollar  Rate Loan,  the  Borrower  shall be  obligated  to
reimburse the Banks in respect thereof pursuant to Section 2.13.

                       Section 2.10. Payments,  Notice of Certain Repayments and
Computations. (a) All payments of principal, interest, commitment fees and other
amounts hereunder, under the Notes and the other Loan Documents (other than Bank
Group  Derivatives)  shall  be made  in  Dollars  to the  Agent  at its  address
specified in Section 9.03 for the account of each of the Banks,  in  immediately
available  funds not later than 11:00 a.m. (New York time) on the date when due.
Upon receipt of such  payments,  the Agent will promptly cause to be distributed
like funds  relating to the payment of principal or interest or commitment  fees
ratably  (other than amounts  payable  pursuant to Section  2.12,  Section 2.13,
Section 2.14 or Section 2.15) to the Banks,  for the account of their respective
Applicable Lending Offices,  and like funds relating to the payment of any other
amount  payable  to any Bank,  to such Bank for the  account  of its  Applicable
Lending Office,  in each case to be applied in accordance with the terms of this
Agreement.

                       (b) Unless the Agent shall have received  notice from the
Borrower prior to the date on which any payment is due to the Banks under the

HOU04:43581.4


<PAGE>



Loan  Documents  that the Borrower will not make such payment in full, the Agent
may assume that the  Borrower has made such payment in full to the Agent on such
date  and  the  Agent  may,  in  reliance  upon  such  assumption,  cause  to be
distributed to each Bank on such due date an amount equal to the amount then due
such Bank. If and to the extent the Borrower shall not have made such payment in
full to the Agent each Bank shall  repay to the Agent  forthwith  on demand such
amount  distributed  to such Bank,  together with interest  thereon for each day
from the date such amount is  distributed  to such Bank until the date such Bank
repays such amount to the Agent at the Federal Funds Rate.

                       (c)    All payments by the Borrower of the fees payable
to the Agent or the  Issuing  Bank  shall be made in  Dollars  directly  to such
Person at its address  specified in Section 9.03 in immediately  available funds
not later than 11:00 a.m. (New York time) on the date when due.

                       (d)    All computations of interest based on the Base
Rate  shall be made on the basis of a year of 365 or 366  days,  as the case may
be, and all computations of interest based on the Eurodollar Rate or the Federal
Funds Rate, as well as commitment  fees, shall be made on the basis of a year of
360 days (unless use of a 360 day year would cause the interest  contracted for,
charged or received  hereunder to exceed the Highest  Lawful Rate, in which case
such  computations  shall be made on the basis of a year of 365 or 366 days,  as
the case may be),  in each case for the  actual  number of days  (including  the
first day but  excluding  the last day)  occurring  in the period for which such
interest or commitment fees are payable.

                       (e)    Whenever any payment under the Loan
Documents  shall be stated to be due on a day other  than a Business  Day,  such
payment shall be made on the next succeeding Business Day, and such extension of
time shall in such case be included in the computation of payment of interest or
commitment  fee, as the case may be;  provided,  if such  extension  would cause
payment of interest on or principal of  Eurodollar  Rate Loans to be made in the
next following  calendar  month,  such payment shall be made on the  immediately
preceding Business Day.

                       (f)  If  any  Bank  shall  obtain  any  payment  (whether
voluntary,  involuntary,  through  the  exercise  of any  right  of  setoff,  or
otherwise)  on account of the Loans made by it (other  than  pursuant to Section
2.08(b),  Section 2.12, Section 2.13, Section 2.14 or Section 2.15), or payments
by the  Issuing  Bank made  pursuant to Section  2.03,  in excess of its ratable
share of payments  on account of the Loans or payments by the Issuing  Bank made
pursuant to Section 2.03,  obtained by all the Banks,  such Bank shall forthwith
purchase  from the other  Banks  such  participations  in the Loans made by such
other Banks, or the reimbursement  obligations in respect of the payments by the
Issuing  Bank made  pursuant  to Section  2.03,  as the case may be, as shall be
necessary to cause such purchasing Bank to share the excess payment ratably with
each of them.  The Borrower  agrees that any Bank so purchasing a  participation
from another Bank  pursuant to this Section  2.10(f) may, to the fullest  extent

HOU04:43581.4


<PAGE>




permitted  by law and  this  Agreement,  exercise  all  its  rights  of  payment
(including the right of setoff) with respect to such  participation  as fully as
if such Bank were the  direct  creditor  of the  Borrower  in the amount of such
participation.

                       Section  2.11.  Fees.  (a) Subject to the  provisions  of
Section 9.13, the Borrower  agrees to pay to each Bank a commitment fee equal to
one-half of one percent  (1/2%) per annum on the average  unused  portion of the
Commitment  of such Bank in effect  from  time to time for the  period  from the
Execution  Date  to,  but  excluding,  the  Maturity  Date (or if  earlier,  the
termination in full of the Commitment). Accrued commitment fees shall be due and
payable in arrears on each  Quarterly  Payment Date in each year, on the date of
any reduction or  termination of the Commitment of such Bank and on the Maturity
Date (or if earlier,  the termination in full of the Commitment);  provided that
if the  Borrower  has not been  notified  by Agent of the  amount of such fee at
least one Business Day prior to any such date, such fee shall be due and payable
one Business  Day after the  Borrower is notified by Agent of such  amount,  and
shall be computed for the period  commencing  with the day to which such fee was
last paid (or, in the case of the first  commitment  fee payment  date,  for the
period commencing with and including the Execution Date) to the date such fee is
due and  payable.  Subject to the  provisions  of Section  9.13,  so long as any
Obligation  shall  remain  outstanding  or any Banks  shall have any  Commitment
hereunder  the Borrower  shall pay the Agent an annual  agency fee of $25,000 on
the Execution Date and on each anniversary date thereof.

                       (b) (i) The Borrower agrees to pay the Issuing Bank a fee
in respect of each Letter of Credit  issued for the account of the Borrower (the
"L/C Fees").  With respect to each Letter of Credit,  Borrower  agrees to pay an
L/C Fee, for the period from the date of issuance of such Letter of Credit in an
amount equal to 1 1/4 % per annum on the outstanding  face amount of such Letter
of Credit.  All L/C Fees shall be paid in immediately  available funds and shall
based on a 360 day year  and  actual  days  elapsed.  Accrued  L/C Fees for each
Letter of Credit shall be due and payable in arrears on each  Quarterly  Payment
Date and on the  termination or expiration  date of such Letter of Credit (or if
earlier, the termination in full of the Commitments).  The Issuing Bank shall be
entitled to retain,  solely for the Issuing Bank's account, .15% per annum as an
issuing fee on all Letters of Credit  (the  "Retained  L/C Fees") and pay to the
Agent for the pro rata benefit of the Banks all  remaining L/C Fees. In addition
to the L/C Fees, the Borrower shall pay the Issuing Bank, solely for the Issuing
Bank's account,  its customary  administrative  service charges  relating to the
issuance of,  amendment to, payment under and transfer of any Letters of Credit.
Such  amounts to be due and  payable  when such  services  are  rendered  by the
Issuing Bank.

                       (ii) On each  Quarterly  Payment  Date,  the Issuing Bank
shall pay the  aggregate  amount of all L/C Fees  collected  by the Issuing Bank
during the  quarterly  period then ended,  net of the amount of any Retained L/C
Fees retained by the Issuing Bank for such period, to the Agent. Upon receipt by
the Agent,  the Agent shall  distribute such net amount of L/C Fees to the Banks
ratably according to their respective  Commitment  Percentages.  Within ten (10)

HOU04:43581.4


<PAGE>




Business Days after each  Quarterly  Payment Date, the Issuing Bank shall give a
written  report to the other  members  of the Bank  Group  specifying  the gross
amount of all L/C Fees collected by the Issuing Bank during the quarterly period
then ended,  the amount of all Retained L/C Fees, and the net amount of such L/C
Fees delivered to the Agent for distribution to the Banks.


                       Section 2.12.  Setoff, Counterclaims and Taxes.  (a) All
payments  of  principal,  interest,  expenses,   reimbursements,   compensation,
commitment fees, L/C Fees, arrangement fees or administration fees and any other
amount from time to time due under the Notes,  this  Agreement or any other Loan
Document shall be made by the Borrower  without setoff or counterclaim and shall
be made free and  clear of and  without  deduction  for any and all  present  or
future taxes,  levies,  imposts,  deductions,  charges or withholdings,  and all
liabilities with respect thereto,  excluding,  in the case of each member of the
Bank Group,  taxes imposed on its income,  and franchise taxes imposed on it, by
the  jurisdiction  under  the laws of which  such  member  of the Bank  Group is
organized or any  political  subdivision  thereof and, in the case of each Bank,
taxes  imposed  on its  income,  and  franchise  taxes  imposed  on  it,  by the
jurisdiction  of  such  Bank's  Applicable   Lending  Office  or  any  political
subdivision thereof (all such non-excluded taxes, levies,  imposts,  deductions,
charges, withholdings and liabilities being hereinafter referred to as "Taxes").
If the Borrower  shall be required by law to deduct any Taxes from or in respect
of any sum  payable  hereunder  or under any Loan  Document to any member of the
Bank Group,  (i) the sum payable  shall be increased as may be necessary so that
after  making  all  required  deductions  (including  deductions  applicable  to
additional  sums payable  under this Section 2.12) such member of the Bank Group
receives  an  amount  equal  to the  sum it  would  have  received  had no  such
deductions been made, (ii) the Borrower shall make such deductions and (iii) the
Borrower shall pay the full amount deducted to the relevant  taxation  authority
or other authority in accordance with applicable law.

                       (b) In addition,  the Borrower  agrees to pay any present
or future  stamp or  documentary  taxes or any other  excise or property  taxes,
charges or similar  levies which arise from any payment made  hereunder or under
the  Notes or the  other  Loan  Documents  or from the  execution,  delivery  or
registration of, or otherwise with respect to, this Agreement,  the Notes or the
other Loan Documents (hereinafter referred to as "Other Taxes").

                       (c) The Borrower will  indemnify  each member of the Bank
Group  for  the  full  amount  of  Taxes  or  Other  Taxes  (including,  without
limitation,  any Taxes or Other  Taxes  imposed by any  jurisdiction  on amounts
payable under this Section 2.12) paid, by such member of the Bank Group (whether
paid on its own behalf or on behalf of any other  member of the Bank  Group) and
any liability (including penalties,  interest and expenses) arising therefrom or
with respect thereto. This indemnification shall be made within 10 days from the
date such member of the Bank Group makes written demand therefor.

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<PAGE>



                       (d)  Within  30 days  after  the date of any  payment  of
Taxes,  the Borrower  will furnish to the Agent,  at its address  referred to in
Section 9.03, the original or a certified copy of a receipt  evidencing  payment
thereof.  If no Taxes are payable in respect of any payment  hereunder  or under
the Notes or the other Loan Documents, upon the reasonable request of the Agent,
the  Borrower  will  furnish to the Agent at its address  referred to in Section
9.03, a certificate from each  appropriate  taxing  authority,  or an opinion of
counsel  acceptable to the Agent stating that such payment is exempt from or not
subject to Taxes.

                       (e)  Without  prejudice  to the  survival  of  any  other
agreement of the Borrower  hereunder,  the  agreements  and  obligations  of the
Borrower contained in this Section 2.12 shall survive the payment in full of the
Credit  Outstanding  and all other amounts owing under the other Loan Documents.
The provisions of this Section 2.12 are in all respects  subject to Section 9.13
hereof.

                       (f) Each Bank  represents and warrants to the Agent,  the
Issuing  Bank,  the  Borrower and the  Guarantor  that such Bank is either (i) a
corporation  organized under the laws of the United States or a state thereof or
(ii) entitled to complete  exemption from United States  withholding tax imposed
on or with respect to any payments, including fees, to be made to it pursuant to
this Agreement and the other Loan Documents (x) under an applicable provision of
a tax  convention  to which the  United  States is a party or (y)  because it is
acting  through a branch,  agency or office in the United States and any payment
to be received by it hereunder is effectively connected with a trade or business
in the United  States.  Upon  becoming  a party to this  Agreement  (whether  by
assignment or as an original signatory  hereto),  and in any event, from time to
time upon the  request  of the Agent or the  Borrower,  each Bank which is not a
corporation  organized  under the laws of the United States or any state thereof
shall  deliver to the Agent and the Borrower such forms,  certificates  or other
instruments as may be required by the Agent in order to establish that such Bank
is entitled to complete  exemption from United States  withholding taxes imposed
on or with  respect to any  payments,  including  fees,  to be made to such Bank
under this  Agreement  and the other Loan  Documents.  Each Bank also  agrees to
deliver to the Borrower and the Agent and such other  supplemental  forms as may
at any time be  required  as a  result  of the  passage  of time or  changes  in
applicable  law or  regulation  in order to  confirm or  maintain  in effect its
entitlement to exemption from U.S.  withholding  tax on any payments  hereunder;
provided, that the circumstances of the Bank at the relevant time and applicable
laws  permit it to do so.  If a Bank  determines,  as a result of any  change in
either (1) applicable law, regulation or treaty, or in any official  application
thereof  or (2) its  circumstances,  that it is  unable  to  submit  any form or
certificate that it is obligated to submit pursuant to this Section 2.12(f),  or
that it is  required  to  withdraw  or  cancel  any  such  form  or  certificate
previously  submitted,  it shall  promptly  notify the Borrower and the Agent of
such fact. If a Bank is organized  under the laws of a jurisdiction  outside the
United  States,  and the  Borrower  and  the  Agent  have  not  received  forms,
certificates  or other  instruments  indicating to their  satisfaction  that all
payments to be made to such Bank hereunder or under the Guaranty are not subject
to United States  withholding  tax or the Agent  otherwise has reason to believe

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<PAGE>




that  such  Bank is  subject  to U.S.  withholding  tax,  the  Borrower  and the
Guarantor  shall withhold  taxes from such payments at the applicable  statutory
rate.  Each Bank shall  indemnify  and hold the  Borrower,  the  Guarantor,  the
Issuing Bank and the Agent  harmless from any United  States  taxes,  penalties,
interest and other  expenses,  costs and losses incurred or payable by them as a
result of either (A) such Bank's failure to submit any form or certificate  that
it is required to provide  pursuant to this  Section  2.12(f) or (B) reliance by
the Borrower,  the Guarantor,  the Issuing Bank or the Agent on any such form or
certificate  which  such Bank has  provided  to them  pursuant  to this  Section
2.12(f).


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<PAGE>



                       Section 2.13.  Funding Losses.  The Borrower shall
indemnify each Bank against any loss or reasonable expense  (including,  but not
limited  to, any loss or  reasonable  expense  sustained  or  incurred  or to be
sustained or incurred in liquidating or reemploying  deposits from third parties
acquired to effect or  maintain  such Loan or any part  thereof as a  Eurodollar
Rate Loan)  which such Bank may  sustain  or incur as a  consequence  of (a) any
failure by the Borrower to fulfill on the date of any  Borrowing  hereunder  the
applicable  conditions set forth in Article III, (b) any failure by the Borrower
to borrow  hereunder,  or to  Convert  Loans  hereunder  or to cause a Letter of
Credit to be issued  after a  Borrowing  Request,  Letter of Credit  Request  or
Conversion Notice, respectively,  has been given, (c) any payment, prepayment or
Conversion  of a  Eurodollar  Rate  Loan  required  or  permitted  by any  other
provisions of this Agreement,  including, without limitation,  payments made due
to the  acceleration  of the maturity of the Notes  pursuant to Section 7.01, or
otherwise  made on a date  other  than the last day of the  applicable  Interest
Period,  (d) any default in the payment or prepayment of the principal amount of
any Loan or any part thereof or interest  accrued  thereon,  as and when due and
payable (at the due date  thereof,  by notice of prepayment or otherwise) or (e)
the  occurrence of an Event of Default.  Such loss or  reasonable  expense shall
include,  without  limitation,  an  amount  equal  to the  excess,  if  any,  as
determined  by each  Bank of (i) its cost of  obtaining  the  funds for the Loan
being paid,  prepaid or Converted  or not  borrowed or  Converted  (based on the
Eurodollar  Rate  applicable  thereto)  for the  period  from  the  date of such
payment,  prepayment  or  Conversion or failure to borrow or Convert to the last
day of the Interest Period for such Loan (or, in the case of a failure to borrow
or Convert,  the Interest  Period for the Loan which would have commenced on the
date of such failure to borrow or Convert)  over (ii) the amount of interest (as
estimated by such Bank) that would be realized by such Bank in  reemploying  the
funds so paid, prepaid or Converted or not borrowed or Converted for such period
or Interest Period, as the case may be. A certificate of each Bank setting forth
any amount or amounts  which such Bank is entitled  to receive  pursuant to this
Section 2.13 shall be  delivered  to the Borrower  (with a copy to the Agent and
the Co-Agent) and shall be conclusive,  if made in good faith,  absent  manifest
error.  The  Borrower  shall pay to the Agent for the  account  of each Bank the
amount shown as due on any  certificate  within 10 days after its receipt of the
same.  Notwithstanding the foregoing, in no event shall any Bank be permitted to
receive  any  compensation  hereunder  constituting  interest  in  excess of the
Highest Lawful Rate.  Without prejudice to the survival of any other obligations
of the Borrower  hereunder,  the  obligations of the Borrower under this Section
2.13 shall  survive  the  termination  of this  Agreement  and/or the payment or
assignment of any of the Notes.

                       Section 2.14.  Change of Law. (a) If at any time any Bank
determines  in good faith (which  determination  shall be  conclusive)  that any
change in any  applicable  law,  rule or  regulation  or in the  interpretation,
application or administration  thereof makes it unlawful, or any central bank or
other Governmental  Authority asserts that it is unlawful,  for such Bank or its
foreign branch or branches to fund or maintain any Eurodollar  Rate Loan (any of
the foregoing  determinations being a "Eurodollar  Event"),  then, such Bank, at
its option,  may: (i) declare that  Eurodollar Rate Loans will no longer be made

HOU04:43581.4


<PAGE>




or  maintained  by such  Bank,  whereupon  the right of the  Borrower  to select
Eurodollar Rate Loans for any Borrowing shall be suspended until such Bank shall
notify the Agent that the circumstances  causing such Eurodollar Event no longer
exist;  (ii)  with  respect  to any  Eurodollar  Rate  Loans of such  Bank  then
outstanding,  require that all such  Eurodollar  Rate Loans be Converted to Base
Rate Loans, in which event all such Eurodollar Rate Loans shall automatically be
Converted  into Base Rate  Loans on the  effective  date of such  notice and all
payments or  prepayments  of principal that would have otherwise been applied to
repay such Converted Eurodollar Rate Loans shall instead be applied to repay the
Base Rate Loans resulting from such Conversion; and/or (iii) with respect to any
Eurodollar  Rate Loans  requested  of such Bank but not yet made as or Converted
into such, require that such Eurodollar Rate Loans be made as or Converted into,
as applicable, Base Rate Loans.

                       (b) Upon the occurrence of any Eurodollar  Event,  and at
any time thereafter so long as such Eurodollar  Event shall continue,  such Bank
may exercise its aforesaid  option by giving written notice thereof to the Agent
and the  Borrower,  such  notice to be  effective  upon  receipt  thereof by the
Borrower.  Any  Conversion of any  Eurodollar  Rate Loan which is required under
this Section 2.14 shall be made,  together with accrued and unpaid  interest and
all other amounts payable to such Bank under this Agreement with respect to such
Converted Loan  (including,  without  limitation,  amounts  payable  pursuant to
Section 2.13 hereof),  on the date stated in the notice to the Borrower referred
to above.

                       Section 2.15.  Increased Costs. (a) If, due to either (i)
the  introduction  of or any  change in or in the  interpretation  of any law or
regulation or (ii) the compliance  with any guideline  issued or request made by
any  central  bank or other  Governmental  Authority  (whether or not having the
force of law) after the date hereof,  there shall be any increase in the cost to
any Bank of agreeing to make or making,  funding or maintaining  Eurodollar Rate
Loans,  then the Borrower shall from time to time,  subject to the provisions of
Section 9.13, pay to the Agent for the account of such Bank  additional  amounts
sufficient to compensate  such Bank for such  increased cost upon demand by such
Bank.

                       (b) If any Bank shall have  determined in good faith that
any law, rule, regulation or guideline adopted after the date hereof pursuant to
or  arising  out of the July  1988  report  of the Basle  Committee  on  Banking
Regulations and Supervisory  Practices  entitled  "International  Convergence of
Capital  Measurement and Capital  Standards" or that the adoption after the date
hereof of any applicable law, rule,  regulation or guideline  regarding  capital
adequacy,  or any change after the date hereof in any of the foregoing or in the
interpretation  or   administration   thereof  by  any  central  bank  or  other
Governmental   Authority  charged  with  the  interpretation  or  administration
thereof,  or compliance  by such Bank (or any lending  office of such Bank) with
any request or directive  regarding  capital adequacy (whether or not having the
force of law) of any such Governmental  Authority or comparable agency,  affects
or would affect the amount of capital  required or expected to be  maintained by
such Bank or any corporation controlling such Bank, then the Borrower shall from

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<PAGE>




time to time,  subject to the  provisions of Section 9.13, pay to such Bank upon
demand additional amounts sufficient to compensate such Bank or such corporation
in the light of such  circumstances,  to the  extent  that such Bank  reasonably
determines  such  increase in capital to be allocable  to the  existence of such
Bank's Commitment hereunder.

                       (c) If any law,  executive order or regulation is adopted
or  interpreted  by any central  bank or other  Governmental  Authority so as to
affect any of the Borrower's  obligations or the compensation to any Bank or the
Issuing Bank in respect of the Letters of Credit or the cost to such Bank or the
Issuing Bank of  establishing  and/or  maintaining the Letters of Credit (or any
participation  therein),  then the Borrower shall from time to time upon demand,
subject to the  provisions of Section 9.13,  reimburse or indemnify such Bank or
the Issuing Bank, as the case may be, with respect  thereto so that such Bank or
the Issuing  Bank, as the case may be, shall be in the same position as if there
had been no such adoption or interpretation.

                       (d) Each Bank or the  Issuing  Bank,  as the case may be,
will notify the Borrower of any event occurring after the date of this Agreement
which  will  entitle  such  Bank or the  Issuing  Bank,  as the case may be,  to
compensation pursuant to this Section 2.15 as promptly as practicable after such
Bank obtains  knowledge of the  occurrence of such event.  A certificate of such
Bank or the Issuing Bank, as the case may be, setting forth in reasonable detail
(i) such amount or amounts as shall be  necessary  to  compensate  such Bank (or
participating  banks or other entities  pursuant to Section 9.02) or the Issuing
Bank, as the case may be, as specified  above and (ii) the  calculation  of such
amount or amounts  shall be delivered  to the  Borrower and shall be  conclusive
absent  manifest  error.  The Borrower  shall pay to such Bank or to the Issuing
Bank, as the case may be, the amount shown as due on any such certificate within
ten (10) days  after its  receipt  of the same.  The  failure of any Bank or the
Issuing  Bank to demand  compensation  for any  increased  costs or reduction in
amounts  received or  receivable  or  reduction  in return on capital  shall not
constitute  a waiver of the right of such Bank,  any other  Bank or the  Issuing
Bank, to demand  compensation  for any  increased  costs or reduction in amounts
received or  receivable or reduction in return on capital as such rights are set
forth  herein.  The  protection  of this  Section 2.15 shall be available to the
Issuing Bank and the Banks  regardless of any possible  contention of invalidity
or  inapplicability  of law,  regulation  or  condition  which  shall  have been
imposed.


HOU04:43581.4


<PAGE>



                              ARTICLE III
                          CONDITIONS OF CREDIT

                       Section 3.01.  Conditions Precedent to Effectiveness, the
Initial  Borrowing or Letter of Credit.  The effectiveness of this Agreement and
the  obligation  of each Bank to make its  initial  Loan on the  occasion of the
initial  Borrowing  hereunder or the obligation of the Issuing Bank to issue the
initial  Letter  of Credit  hereunder,  as the case may be,  is  subject  to the
conditions precedent that the Agent shall have received on or before the date of
such initial Borrowing or initial Letter of Credit,  all of the following,  each
in form and  substance  reasonably  satisfactory  to the Bank  Group and in such
number of counterparts as may be reasonably requested by the Agent:

                       (a)    The following Loan Documents duly executed by
the Persons indicated below:

                       (i)    this Agreement executed by the Borrower and
      each member of the Bank Group,

                       (ii)   the Notes executed by the Borrower,

                       (iii)  the New Mortgage executed by the Borrower,

                       (iv)   the Mortgage Amendment amending the Existing
      Mortgage executed by the Borrower, and

                       (v)    the Guaranty executed by the Guarantor.

                       (b)  Evidence  that the  Liens  created  by the  Security
Documents have been duly perfected, or will be duly perfected upon the filing of
the instruments  referred to in subsections  (i) and (ii) below,  and constitute
valid first priority Liens, which shall include, without limiting the generality
of the foregoing:

                       (i)  the   delivery  to  the  Agent  of  such   financing
      statements   under  the  Uniform   Commercial  Code  for  filing  in  such
      jurisdictions as the Agent may require, and

                       (ii) the  delivery to the Agent of the New  Mortgage  and
      the Mortgage  Amendment for filing in such  jurisdictions as the Agent may
      require.

                       (c) A  certificate  of  the  secretary  or  an  assistant
secretary of the Borrower certifying, inter alia, (i) true and correct copies of
resolutions  adopted by the Board of Directors  of the Borrower (A)  authorizing
the execution, delivery and performance by the Borrower of the Loan Documents to
which  it is or will be a party  and the  Borrowings  to be made or  Letters  of
Credit  to be  issued  thereunder  and  the  consummation  of  the  transactions
contemplated  thereby, (B) authorizing officers of the Borrower to negotiate the

HOU04:43581.4


<PAGE>




Loan Documents to which it is a party and which will be delivered at or prior to
the date of the  initial  Borrowing  or  Letter of  Credit  and (C)  authorizing
officers of the  Borrower to execute and deliver the Loan  Documents to which it
is or will be a party and any related documents,  including, without limitation,
any agreement or security document contemplated by this Agreement, (ii) true and
correct  copies of the articles of  incorporation  and bylaws (or other  similar
charter  documents)  of the  Borrower  and (iii)  the  incumbency  and  specimen
signatures of the officers of the Borrower  executing any documents on behalf of
it.

                       (d) A  certificate  of  the  secretary  or  an  assistant
secretary of the Guarantor  certifying,  inter alia, (i) true and correct copies
of  resolutions  adopted  by  the  Board  of  Directors  of  the  Guarantor  (A)
authorizing the execution, delivery and performance by the Guarantor of the Loan
Documents  to  which  it is or  will  be a party  and  the  consummation  of the
transactions  contemplated thereby, (B) authorizing officers of the Guarantor to
negotiate the Loan  Documents to which it is a party and which will be delivered
at or prior to the date of the  initial  Borrowing  or Letter of Credit  and (C)
authorizing  officers of the Guarantor to execute and deliver the Loan Documents
to which it is or will be a party and any related documents,  including, without
limitation,  any agreement or security document  contemplated by this Agreement,
(ii) true and correct  copies of the  articles of  incorporation  and bylaws (or
other similar  charter  documents) of the Guarantor and (iii) the incumbency and
specimen  signatures of the officers of the Guarantor executing any documents on
behalf of it.

                       (e)  Certificates of appropriate  public  officials as to
the existence  and good standing of the Borrower in the States of Texas,  Nevada
and Wyoming.

                       (f)  Certificates of appropriate  public officials as the
existence and good standing of the Guarantor in Alberta, Canada.

                       (g)  An  engineering   report  covering  the  Acquisition
Properties  and the other Oil and Gas  Properties  of the  Borrower  prepared by
DeGolyer  and  MacNaughton  dated  as of June 30,  1996  (the  "Initial  Reserve
Report").

                       (h)  Evidence  satisfactory  to the Agent that all of the
conditions  to the  Initial  Purchaser's  obligation  under  the  Bond  Purchase
Agreement have been satisfied and that the Bond Offering has been consummated in
accordance with the Bond Purchase Agreement and all Requirements of Law.

                       (i) Evidence satisfactory to the Agent that the Guarantor
has  acquired  all of the  outstanding  capital  stock of CGGS and that CGGS has
merged with and into the Guarantor.

                       (j) Evidence satisfactory to the Agent that the Portilla-
Happy Acquisition has been consummated in accordance with the Portilla-Happy

HOU04:43581.4


<PAGE>



                       Acquisition  Documents  and all  Requirements  of Law and
original  counterparts  of  the  assignment  of the  Portilla-Happy  Acquisition
Properties to the Borrower.

                       (k) A portion of the proceeds of the Bond Offering  shall
have been used to repay in full all Obligations accrued or otherwise outstanding
under the Original Credit Agreement.

                       (l)  Evidence  of payment  in full of the  Portilla-Happy
Debt and fully  executed  and  acknowledged  releases  of all Liens  existing as
security for the Portilla-Happy Debt, in form, scope and substance  satisfactory
to the Agent.

                       (m) Title opinions  covering at least 80% of the value of
the Borrower's Oil and Gas Properties  included in the Initial Reserve Report in
form, scope and substance satisfactory to the Agent.

                       (n) Copies of all  authorizations,  consents,  approvals,
licenses,  filings or registrations  obtained from or made with any Governmental
Authority  or any  other  Person  in  connection  with  the Bond  Offering,  the
Acquisition or the execution,  delivery and  performance of the Loan  Documents,
together  with a certificate  from a Responsible  Officer of the Borrower to the
effect that all such authorizations,  consents, approvals,  licenses, filings or
registrations  have been obtained or made, as applicable,  and are in full force
and effect.

                       (o) A list of all  insurance  policies  and  programs  in
effect with respect to the  properties  and  businesses  of the Borrower and its
Subsidiaries, specifying for each such policy or program the amount thereof, the
risks insured  against  thereby,  the name of the insurer and each insured party
thereunder and the policy or other identification number thereof,  together with
a certificate from a Responsible  Officer of the Borrower to the effect that all
such policies and programs are in full force and effect.

                       (p) A satisfactory review of Borrower, including a review
of its marketing, transportation and hedging arrangements for Hydrocarbons.

                       (q) A certificate signed by a Responsible  Officer of the
Borrower  certifying  as to the  satisfaction  of the  conditions  specified  in
Section 3.02(a).

                       (r)  The  favorable,  signed  opinions  of  Cox  &  Smith
Incorporated,  special  counsel to the  Borrower and its  Subsidiaries,  Burnet,
Duckworth & Palmer,  special  Canadian  counsel to the Guarantor,  and Stikeman,
Elliott,  special  Canadian  counsel  to the  Agent  and the  Bank  Group,  each
addressed  to the Agent and the Bank  Group,  in form and  substance  reasonably
satisfactory to the Agent and its counsel.

                       (s) A written  confirmation from the Process Agent of its
appointment and acceptance as process agent for the Guarantor as provided for

HOU04:43581.4


<PAGE>



in the Guaranty.

                       (t) The payment to the Bank Group of the fees due to them
as of such date under the Loan Documents.

                       (u) Such other  documents,  certificates  and opinions as
the Agent may reasonably  request  relating to this Agreement and the other Loan
Documents.

                       Section  3.02.  Conditions  Precedent  to All  Letters of
Credit and Loans.  The  obligation  of the  Issuing  Bank to issue any Letter of
Credit,  and of each  Bank to make any Loan,  shall be  subject  to the  further
conditions precedent that (a) on the Borrowing Date of such Loan or the issuance
date of such  Letter of  Credit,  as the case may be, the  following  statements
shall be true,  and the  Borrower,  by virtue  of its  delivery  of a  Borrowing
Request or a Letter of Credit  Request,  as applicable,  shall be deemed to have
certified  to the Bank  Group as of such date that (i) the  representations  and
warranties  contained in Article IV are true and correct on and as of such date,
before and after giving effect to such Loan or Letter of Credit, as the case may
be,  and as though  made on and as of such  date,  (ii) no  Default  or Event of
Default has occurred and is continuing, or would result from such Loan or Letter
of  Credit,  as the case may be,  and  (iii) no event  has  occurred  since  the
Execution  Date that could  reasonably  be expected  to have a Material  Adverse
Effect on the Borrower or any of its  Subsidiaries  and (b) that the Agent shall
have  received  on or  before  such  date such  other  documents,  certificates,
information  and opinions as the Agent may reasonably  request  relating to this
Agreement and the other Loan  Documents,  each in form and substance  reasonably
satisfactory to the Agent.


                               ARTICLE IV
                     REPRESENTATIONS AND WARRANTIES

                       In order to  induce  the Bank  Group to enter  into  this
Agreement,  the  Borrower  hereby  represents  and warrants to the Bank Group as
follows:  Section  4.01.  Corporate  Existence.  Each  of the  Borrower  and its
Subsidiaries  is a  corporation  duly  organized,  validly  existing and in good
standing under the laws of the  jurisdiction of its  incorporation,  and is duly
qualified or licensed to transact  business as a foreign  corporation  and is in
good standing  under the laws of each  jurisdiction  in which the conduct of its
operations  or  the  ownership  or  leasing  of  its  properties  requires  such
qualification  or  licensing,  except  where the failure to be so  qualified  or
licensed will not have a Material  Adverse Effect on such Person.  Schedule 4.01
is a complete list of the Borrower's Subsidiaries.

                       Section 4.02.  Corporate Authority; Binding Obligations.
Each of the Borrower and its  Subsidiaries has all requisite corporate power and

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<PAGE>



authority to conduct its  business,  to own,  operate and encumber its Property,
and to  execute,  deliver  and  perform  all of its  obligations  under the Loan
Documents  executed  by, or to be  executed  by,  such  Person.  The  execution,
delivery and  performance of each of the Loan Documents to which the Borrower or
any of its  Subsidiaries  is a party and the  consummation  of the  transactions
contemplated  thereby  have  been duly  authorized  by all  necessary  corporate
action.  Each  of  the  Loan  Documents  to  which  the  Borrower  or any of its
Subsidiaries is a party has been duly executed and delivered by such Person,  is
in full force and effect and constitutes the legal, valid and binding obligation
of such Person,  enforceable  against it in accordance with its terms, except as
such  enforceability may be limited by bankruptcy,  insolvency,  reorganization,
moratorium or other similar laws affecting the enforcement of creditor's  rights
generally and general  principles of equity. The Security Documents create valid
Liens in the  collateral  described  therein,  securing the secured  obligations
described therein.

                       Section 4.03. No Conflict.  The  execution,  delivery and
performance by the Borrower or any of its  Subsidiaries of each Loan Document to
which such Person is a party and the  consummation  of each of the  transactions
contemplated  thereby do not and shall not, by the lapse of time,  the giving of
notice or otherwise:  (a) constitute a violation of any  Requirement of Law or a
breach  of  any  provision   contained  in  the  articles  or   certificate   of
incorporation or bylaws of such Person, or any shareholder  agreement pertaining
to such Person, or contained in any material  agreement,  instrument or document
to which it is now a party or by which it or its properties is bound, except for
such violations or breaches that will not have a Material  Adverse Effect on any
such Person;  or (b) result in or require the creation or imposition of any Lien
whatsoever  upon any of the  properties  or assets of the Borrower or any of its
Subsidiaries  (other than Excepted Liens and Liens in favor of the Agent arising
pursuant to the Loan Documents).

                       Section  4.04.  No Consent.  No  authorization,  consent,
approval,  license,  or  exemption  of  or  filing  or  registration  with,  any
Governmental Authority or any other Person, which has not been obtained, was, is
or will be necessary for the valid  execution,  delivery or  performance  by the
Borrower or any of its  Subsidiaries of any of the Loan Documents to which it is
a party and the consummation of each of the transactions contemplated thereby or
the Borrower's or any of its Subsidiaries' ownership, use or operation of any of
their Properties other than (a) those listed on Schedule 4.04 and (b) those that
the failure to obtain,  file or make will not have a Material  Adverse Effect on
any such Person.

                       Section  4.05.  No  Defaults  or  Violations  of Law.  No
Default or Event of Default has occurred and is continuing. No default (or event
or  circumstance  occurred  which,  but for the passage of time or the giving of
notice, or both, would constitute a default) has occurred and is continuing with
respect to any note, indenture,  loan agreement,  mortgage, lease, deed or other
agreement  to which the  Borrower  or any of its  Subsidiaries  is a party or by
which any of them or their  Properties  is bound,  except for such defaults that
will  not  have  a  Material  Adverse  Effect  on  the  Borrower  or  any of its
Subsidiaries. Neither the Borrower nor

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<PAGE>



any of its  Subsidiaries  is in violation of any  applicable  Requirement of Law
except for such violations  that will not have a Material  Adverse Effect on any
such Person.

                       Section  4.06.  Financial  Position.  (a)  Prior  to  the
Execution  Date,  the  Borrower  has  furnished  to the Agent and the Bank Group
audited  financials of the Borrower and its Subsidiaries as of December 31, 1995
and  unaudited  financials  of the  Borrower  as of June 30,  1996.  The audited
financials referred to in the previous sentence have been prepared in accordance
with generally accepted accounting  principles  consistently  applied throughout
the periods involved and present fairly the financial  condition of the Borrower
and its Subsidiaries as of the dates thereof and the results of their operations
for the periods then ended. No event has occurred since June 30, 1996 that could
reasonably be expected to have a Material  Adverse Effect on the Borrower or any
of its Subsidiaries.

                       (b) Except as fully  reflected in the audited  financials
referred to in paragraph (a) of this Section 4.06, as of the date hereof,  there
are no liabilities or obligations of the Borrower or any of its  Subsidiaries of
any nature whatsoever  (whether absolute,  accrued,  contingent or otherwise and
whether or not due) which,  either  individually  or in aggregate,  would have a
Material Adverse Effect on the Borrower or any of its Subsidiaries.

                       Section 4.07.  Litigation.  Except as set out in Schedule
4.07, there are no actions, suits or proceedings pending or, to the knowledge of
the  Borrower  threatened  against  or  affecting  the  Borrower  or  any of its
Subsidiaries,   or  the  Properties  of  any  such  Person,  before  or  by  any
Governmental  Authority or other Person,  which, if determined adversely to such
Person could have a Material Adverse Effect on any such Person.

                       Section 4.08. Use of Proceeds. (a) The Borrower's uses of
the proceeds of the Loans and of the Letters of Credit are, and will continue to
be, legal and proper  corporate  uses (duly  authorized by  Borrower's  board of
directors),  and such uses are consistent  with the terms of the Loan Documents,
including, without limitation, Section 5.09, and all Requirements of Law.

                       (b) Neither the Borrower nor any of its  Subsidiaries  is
engaged in the business of  extending  credit for the purpose of  purchasing  or
carrying  margin stock (within the meaning of Regulation  U), and no part of the
proceeds of any Loan or Letter of Credit will be used,  directly or  indirectly,
(i) to purchase or carry any margin stock or to extend  credit to others for the
purpose of  purchasing  or carrying  any margin stock or (ii) for the purpose of
purchasing, carrying or trading in any securities under such circumstances as to
involve the Borrower or any of its Subsidiaries in a violation of Regulation X.

                       Section  4.09.  Governmental   Regulation.   Neither  the
Borrower nor any of its  Subsidiaries is subject to regulation  under the Public
Utility Holding Company Act, as amended,  the Investment Company Act of 1940, as
amended,  or any  other  Requirement  of Law such that the  ability  of any such

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<PAGE>




Person to incur  indebtedness  is  limited  or its  ability  to  consummate  the
transactions  contemplated  by this  Agreement,  the other Loan Documents or any
document executed in connection therewith is impaired.

                       Section  4.10.  Disclosure.  The  schedules,   documents,
exhibits,  reports,  certificates  and other written  statements and information
furnished by or on behalf of the Borrower or any of its Subsidiaries to the Bank
Group do not  contain  any  Material  misstatement  of fact,  or omit to state a
Material fact necessary in order to make the statements  contained  therein,  in
light of the circumstances  under which they were made, not misleading.  Neither
the Borrower nor any of its  Subsidiaries  has  intentionally  withheld any fact
known to it which has or is reasonably  likely to have a Material Adverse Effect
on the Borrower or any of its Subsidiaries.

                       Section 4.11.  ERISA.  (a)  The Borrower, and each ERISA
Affiliate and Subsidiary  have operated and  administered  each Pension Plan and
Other  Benefit Plan in  compliance  with all  applicable  laws,  except for such
instances of  noncompliance  as have not resulted in and could not reasonably be
expected to result in a Material  Adverse  Effect.  Neither the Borrower nor any
ERISA Affiliate or Subsidiary has incurred any liability  pursuant to Title I or
IV of ERISA or the penalty or excise tax provisions of the Internal Revenue Code
relating to employee  benefit  plans (as defined in Section 3 of ERISA),  and no
event,  transaction  or condition has occurred or exists or is  threatened  that
could  reasonably be expected to result in the  incurrence of any such liability
by the Borrower or any ERISA  Affiliate or  Subsidiary,  or in the imposition of
any Lien on any of the rights, properties or assets of the Borrower or any ERISA
Affiliate or Subsidiary, in either case pursuant to Title I or IV of ERISA or to
such penalty or excise tax  provisions  or to Section  401(a)(29)  or 412 of the
Internal  Revenue Code,  other than such  liabilities  or Liens as would not be,
individually or in the aggregate, Material.

                       (b)  The   present   value  of  the   aggregate   benefit
liabilities under each Pension Plan subject to Title IV of ERISA,  determined as
of the end of such Pension  Plan's most recently ended plan year on the basis of
the actuarial  assumptions specified for funding purposes in such Pension Plan's
most recent actuarial  valuation  report,  did not exceed the aggregate  current
value of the assets of such Pension Plan allocable to such benefit  liabilities.
The term  "benefit  liabilities"  has the meaning  specified  in section 4001 of
ERISA and the  terms  "current  value"  and  "present  value"  have the  meaning
specified in Section 3 of ERISA.

                       (c)  The   Borrower   and  its   ERISA   Affiliates   and
Subsidiaries  do not  currently  and have never had any  liability or obligation
with respect to any  liabilities  (and are not subject to contingent  withdrawal
liabilities)  under  section  4201 or 4204 of any  Multiemployer  Plan.  (d) The
expected  post-retirement  benefit obligation  (determined as of the last day of
the  Borrower's  most recently  ended fiscal year in accordance  with  Financial

HOU04:43581.4


<PAGE>




Accounting  Standards  Board  Statement No. 106,  without  regard to liabilities
attributable to continuation  coverage mandated by section 4980B of the Internal
Revenue  Code   ("COBRA"))  of  the  Borrower  and  its  ERISA   Affiliates  and
Subsidiaries is not Material and, except as modified by COBRA,  such obligations
can be  unilaterally  terminated  at any  time  by the  Borrower,  or its  ERISA
Affiliates and Subsidiaries without any Material liability.

                       Section 4.12.  Payment of Taxes.  The Borrower has filed,
and has caused each of its  Subsidiaries  to file, all federal,  state and local
tax returns and other  reports that the Borrower  and each such  Subsidiary  are
required by law to file and have paid all taxes and other  similar  charges that
are due and payable  pursuant to such returns and reports,  except to the extent
any of the same  may be  contested  in good  faith  by  appropriate  proceedings
promptly initiated and diligently conducted,  and with respect to which adequate
reserves  have  been set aside on the books of such  Person in  accordance  with
generally accepted accounting principles.

                       Section 4.13.  Title and Liens.  (a) Except as set out in
Schedule 4.13 the Borrower and its  Subsidiaries  have good and defensible title
to its Properties, free and clear of all Liens except Liens permitted by Section
6.02.  Except as set forth in  Schedule  4.13,  after  giving full effect to the
Excepted Liens,  the Borrower owns the net interests in production  attributable
to the Oil and Gas  Properties  reflected in the Initial  Reserve Report and the
ownership  of such Oil and Gas  Properties  shall  not in any  material  respect
obligate  the  Borrower  to  bear  the  costs  and  expenses   relating  to  the
maintenance,  development and operations of each such Oil and Gas Property in an
amount in excess of the working  interest of each Oil and Gas Property set forth
in the Initial  Reserve Report.  Further,  upon delivery of each Reserve Report,
the statements made in the preceding sentence shall be true with respect to such
furnished  Reserve Reports including the ownership of the Oil and Gas Properties
set forth therein.  To the best of the  Borrower's  knowledge,  all  information
contained  in the Initial  Reserve  Report is true and  correct in all  material
respects as of the date thereof.

                       (b) All material leases and agreements  necessary for the
conduct of the  business  of the  Borrower  and its  Subsidiaries  are valid and
subsisting,  in full force and effect and,  to the  knowledge  of the  Borrower,
there exists no default or event or circumstance which with the giving of notice
or the passage of time or both would give rise to a default under any such lease
or  leases,  which  would  affect in any  material  respect  the  conduct of the
business of the Borrower and its Subsidiaries.

                       (c) The rights,  properties  and other  assets  presently
owned,  leased or  licensed  by the  Borrower  and its  Subsidiaries  including,
without  limitation,  all  easements  and  rights of way,  include  all  rights,
properties   and  other  assets   necessary  to  permit  the  Borrower  and  its
Subsidiaries  to conduct  their  business in all  material  respects in the same
manner as their business has been conducted prior to the date hereof.


HOU04:43581.4


<PAGE>



                       (d) All of the assets and  properties of the Borrower and
its  Subsidiaries  which  are  reasonably  necessary  for the  operation  of its
business are in good working  condition and are  maintained  in accordance  with
prudent business standards.

                       Section  4.14.  Gas  Imbalances.  As of the  date of this
Agreement,  except  as  set  forth  in  Schedule  4.14  or on  the  most  recent
certificate  delivered pursuant to Section 5.10(c),  on a net basis there are no
gas imbalances,  take or pay or other prepayments with respect to the Borrower's
Oil and Gas Properties which would require the Borrower to deliver  Hydrocarbons
produced  from the Oil and Gas  Properties  at some future time  without then or
thereafter  receiving full payment therefor exceeding a market value of $100,000
in the aggregate.

                       Section 4.15.  Environmental Matters. Except as disclosed
in the  environmental  reports  delivered  to the  Bank  Group  pursuant  to the
Original Credit Agreement or Section 3.01 hereof,  (a) (i) the Borrower and each
of its  Subsidiaries  possess  all  environmental,  health and safety  licenses,
permits, authorizations,  registrations,  approvals and similar rights necessary
under law or otherwise  for such Person to conduct its  operations  as now being
conducted, (ii) each of such licenses, permits,  authorizations,  registrations,
approvals and similar rights is valid and  subsisting,  in full force and effect
and enforceable by such Person,  and (iii) such Person is in compliance with all
terms,   conditions  or  other  provisions  of  such  permits,   authorizations,
registrations,  approvals  and  similar  rights,  except to the extent  that the
failure to do so will not have a Material  Adverse  Effect on such  Person;  (b)
neither the Borrower nor any of its Subsidiaries has received any notices of any
violation of, noncompliance with, or remedial obligation under,  Requirements of
Environmental  Laws,  and there are no writs,  injunctions,  decrees,  orders or
judgments  outstanding,  or lawsuits,  claims,  proceedings,  investigations  or
inquiries pending or, to the knowledge of the Borrower, threatened,  relating to
the  ownership,  use,  condition,  maintenance,  or operation  of, or conduct of
business  related to, any Property owned,  leased or operated by the Borrower or
any  of  its   Subsidiaries,   other  than  those   violations,   instances   of
noncompliance,  obligations,  writs,  injunctions,  decrees, orders,  judgments,
lawsuits, claims, proceedings,  investigations or inquiries that will not have a
Material Adverse Effect on such Person;  (c) there are no material  obligations,
undertakings or liabilities  arising out of or relating to Environmental Laws to
which  the  Borrower  or any of its  Subsidiaries  has  agreed  to,  assumed  or
retained,  or by which the  Borrower  or any of its  Subsidiaries  is  adversely
affected, by contract or otherwise;  and (d) neither the Borrower nor any of its
Subsidiaries  has  received a written  notice or claim to the  effect  that such
Person  is or may be  liable  to  any  Person  as the  result  of a  release  or
threatened release of a hazardous material or solid waste.



HOU04:43581.4


<PAGE>



                               ARTICLE V
                         AFFIRMATIVE COVENANTS

                       So long as any Letter of Credit remains outstanding,  any
principal  amount  of any  Loan,  any  principal  amount  of  any  reimbursement
obligation  in respect of any Letter of Credit,  any amount of interest  accrued
under the Notes or in  respect of any Letter of  Credit,  or any  commitment  or
other fee,  expense,  compensation  or any other amount payable to any member of
the Bank Group under the Loan  Documents  shall remain unpaid or  outstanding or
any Bank shall have any  Commitment  hereunder,  unless the Majority Banks shall
otherwise consent in writing:

                       Section 5.01. Reporting Requirements.  The Borrower shall
deliver or cause to be  delivered to the Agent (with  sufficient  copies for the
Agent to distribute the same to the other members of the Bank Group):

                       (a) As soon as available  and in any event within  forty-
five (45) days after the end of each of the first three  fiscal  quarters of the
Borrower:

                       (i) copies of the unaudited  consolidated  balance sheets
      of the Borrower  and its  Subsidiaries  as of the end of such period,  and
      unaudited  consolidated  statements of income,  retained earnings and cash
      flows of the Borrower and its  Subsidiaries for that fiscal period and for
      the  portion of the fiscal  year  ending  with such  period,  in each case
      setting forth in comparative  form (on a  consolidated  basis) the figures
      for  the  corresponding  period  of  the  preceding  fiscal  year,  all in
      reasonable detail; and

                       (ii)  a  certificate  of a  Responsible  Officer  of  the
      Borrower (1) stating that (A) such financial  statements fairly present in
      all material respects the consolidated  financial  position and results of
      operations  of the  Borrower  and  its  Subsidiaries  in  accordance  with
      generally accepted accounting principles consistently applied,  subject to
      year-end  adjustments and the absence of notes and (B) no Default or Event
      of  Default  has  occurred  and is  continuing  or, if any such  event has
      occurred and is continuing,  the action the Borrower is taking or proposes
      to  take  with  respect  thereto,   and  (2)  setting  forth  calculations
      demonstrating  compliance  by the Borrower with  Sections  6.04,  6.05 and
      6.06.

                       (b) As soon as available  and in any event within  ninety
(90) days after the end of each  fiscal year of the  Borrower  (i) copies of the
audited  consolidated  and  consolidating  balance sheet of the Borrower and its
Subsidiaries  as of the close of such fiscal year and audited  consolidated  and
consolidating statements of income and retained earnings and a statement of cash
flows of the Borrower and its  Subsidiaries  for such fiscal year,  in each case
setting forth in comparative form (on a consolidated  basis) the figures for the
preceding  fiscal year, all in reasonable  detail and  accompanied by an opinion
thereon (which shall not be qualified by reason of any limitation imposed by the

HOU04:43581.4


<PAGE>




Borrower) of independent accountants of recognized national standing selected by
the Borrower and reasonably  satisfactory  to the Majority  Banks, to the effect
that such  consolidated  financial  statements  have been prepared in accordance
with generally accepted accounting  principles  consistently applied (except for
changes in which such  accountants  concur) and that such audit has been made in
accordance with generally  accepted auditing standards and (ii) a certificate of
a  Responsible   Officer  of  the  Borrower  (A)  setting   forth   calculations
demonstrating  compliance by the Borrower with Sections 6.04,  6.05 and 6.06 and
(B) stating that no Default or Event of Default has  occurred and is  continuing
or, if any such event has occurred and is continuing, the action the Borrower is
taking or proposes to take with respect thereto.

                       (c) Promptly after the sending or filing thereof,  copies
of all  reports and  shareholder  information  which the  Borrower or any of its
Subsidiaries  sends  to any  holders  of its  respective  securities,  in  their
capacities  as  holders  of such  securities  and  not in  their  capacities  as
directors,  officers  or  employees  of the  Borrower  or any of the  Borrower's
Subsidiaries, or to the SEC.

                       (d) As  soon  as  reasonably  possible  and in any  event
within ten (10) days after the Borrower or any of its Subsidiaries becomes aware
of the  occurrence  of a  Default  or  Event  of  Default,  a  certificate  of a
Responsible  Officer of the Borrower  setting  forth  details of such Default or
Event of  Default  and the  action  which has been  taken or is to be taken with
respect thereto.

                       (e) As  soon  as  reasonably  possible  and in any  event
within ten (10) days after the Borrower or any of its Subsidiaries becomes aware
thereof,  written  notice from a Responsible  Officer of the Borrower of (i) the
institution of or overt threat of, any action,  suit,  proceeding,  governmental
investigation  or  arbitration  by any  Governmental  Authority  or other Person
against or affecting the Borrower or any of its  Subsidiaries  that could have a
Material  Adverse  Effect on any such  Person  and that has not been  previously
disclosed in writing to the Bank Group pursuant to this Section 5.01 or (ii) any
material development in any action, suit, proceeding, governmental investigation
or arbitration already disclosed to the Bank Group pursuant to this Section 5.01
or Section 3.01.

                       (f) As  soon  as  reasonably  possible  and in any  event
within ten (10) days after the Borrower or any of its Subsidiaries becomes aware
thereof,  written  notice from a Responsible  Officer of the Borrower of (i) any
violation of, noncompliance with, or remedial obligations under, Requirements of
Environmental  Laws,  (ii) any  release  or  threatened  release  affecting  any
property  owned,  leased or operated by the Borrower or any of its  Subsidiaries
that  could  have  a  Material  Adverse  Effect  on the  Borrower  or any of its
Subsidiaries,  (iii) the amendment or  revocation of any permit,  authorization,
registration,  approval  or similar  right  that  could have a Material  Adverse
Effect  on  the  Borrower  or  any  of  its  Subsidiaries  or  (iv)  changes  to
Requirements of Environmental  Laws that could have a Material Adverse Effect on
the Borrower or any of its Subsidiaries.

HOU04:43581.4


<PAGE>



                       (g)  Promptly,  and in any event  within  five days after
becoming  aware of any of the  following,  a written  notice  setting  forth the
nature thereof and the action,  if any, that the Borrower or an ERISA  Affiliate
or  Subsidiary  proposes to take with respect  thereto:  (i) with respect to any
Pension Plan, any Reportable Event, for which notice thereof has not been waived
pursuant to such regulations as in effect on the date hereof; or (ii) the taking
by the  PBGC of  steps  to  institute,  or the  threatening  by the  PBGC of the
institution of,  proceedings under section 4042 of ERISA for the termination of,
or the appointment of a trustee to administer,  any Pension Plan, or the receipt
by the  Borrower  or any  ERISA  Affiliate  or  Subsidiary  of a  notice  from a
Multiemployer  Plan that such action has been taken by the PBGC with  respect to
such Multiemployer Plan; or (iii) any event, transaction or condition that could
result in the incurrence of any liability by the Borrower or any ERISA Affiliate
or  Subsidiary  pursuant  to Title I or IV of ERISA or the penalty or excise tax
provisions of the Internal  Revenue Code relating to employee  benefit plans, or
in the imposition of any Lien on any of the rights,  properties or assets of the
Borrower or any ERISA Affiliate or Subsidiary pursuant to Title I or IV of ERISA
or such penalty or excise tax  provisions;  or (iv) the  inability or failure of
the Borrower or any ERISA  Affiliate or Subsidiary to make timely any payment or
contribution to or with respect to any Pension Plan, Multiemployer Plan or Other
Benefit Plan, if such failure, either separately or together with all other such
failures  could  reasonably  be expected to be  Material;  or (v) any event with
respect to any Pension  Plan,  Multiemployer  Plan and/or  Other  Benefit  Plan,
individually  or in the  aggregate,  that could  reasonably  be expected to be a
Material liability.

                       (h) As soon as available and in any event  simultaneously
with the  delivery of the  financial  statements  delivered  pursuant to Section
5.01(b),  copies of the budget of the Borrower and its Subsidiaries containing a
consolidated and consolidating balance sheet, and detailed statements of income,
cash flow and projected capital expenditures for the then current fiscal year.

                       (i) On or before April 30, 1997, an environmental  report
prepared by an independent environmental firm approved by the Agent covering the
real  property  owned by the Borrower and its  Subsidiaries  in form,  scope and
substance reasonably satisfactory to the Agent.

                       (j) Such  other  information  as any  member  of the Bank
Group  may  from  time to  time  reasonably  request  respecting  the  business,
properties,  operations or condition, financial or otherwise, of the Borrower or
any of its Subsidiaries.

                       Section 5.02.  Taxes;  Claims.  The Borrower will pay and
discharge,  and will cause each of its  Subsidiaries  to pay and discharge,  all
taxes,  assessments and governmental  charges or levies imposed upon such Person
or upon its income or profits, or upon any properties  belonging to such Person,
prior to the date on which  penalties  attach  thereto,  and all  lawful  claims
which, if unpaid,  might become a Lien upon any properties of such Person, other
than any such tax, assessment, charge, levy or claim which is being contested in
good  faith  by  appropriate   proceedings  promptly  initiated  and  diligently

HOU04:43581.4


<PAGE>




conducted,  and with  respect to which  adequate  reserves  are set aside on the
books  of  such  Person  in  accordance  with  generally   accepted   accounting
principles.

                       Section  5.03.  Compliance  with Laws.  The Borrower will
comply,  and will cause each of its Subsidiaries to comply,  with all applicable
Requirements of Law imposed by, any Governmental Authority,  non-compliance with
which  might  have a  Material  Adverse  Effect  on  any  such  Person.  Without
limitation of the  foregoing,  the Borrower  shall,  and shall cause each of its
Subsidiaries  to, comply with all Requirements of  Environmental  Laws,  operate
properties  and  conduct  its  business in  accordance  with good  environmental
practices,  and handle, treat, store and dispose of hazardous materials or solid
waste in accordance with such practices,  except where the failure to do so will
not have a Material Adverse Effect on any such Person.

                       Section 5.04. Insurance.  The Borrower will maintain, and
will cause each of its  Subsidiaries  to maintain,  with  financially  sound and
reputable  insurance  companies or  associations,  or  self-insure  against such
risks,  and in such  amounts (and with  co-insurance  and  deductibles),  as are
usually insured  against by Persons of similar size and  established  reputation
engaged in the same or similar  businesses  and  similarly  situated,  including
insurance against fire, casualty,  business  interruption,  injury to Persons or
property and other normal hazards normally  insured against,  but, in any event,
such insurance shall not be substantially  dissimilar from that described in the
insurance  schedule delivered on the Effective Date pursuant to Section 3.01. In
addition,  on or before January 31 of each year commencing January 31, 1997, the
Borrower  will deliver to the Agent a report  prepared by  Borrower's  insurance
broker  listing all insurance  policies and programs then in effect with respect
to the properties  and businesses of the Borrower and each of its  Subsidiaries,
specifying  for each such policy and program,  (a) the amount  thereof,  (b) the
risks  insured  against  thereby,  (c) the name of the insurer and each  insured
party  thereunder  and (d) the policy or other  identification  number  thereof.
Other than with respect to worker's compensation policies, each policy listed on
the  schedule  delivered  pursuant to Section  3.01 and each  additional  policy
maintained in compliance with this Agreement shall be endorsed showing the Agent
as an  additional  insured,  or a loss payee,  as  applicable.  All  policies of
insurance required by the terms of this Agreement or any Security Document shall
provide that at least 30 days' prior written notice be given to the Agent of any
termination, cancellation, reduction or other modification of such insurance.

                       Section  5.05.  Corporate  Existence.  The Borrower  will
preserve and maintain,  and will cause each of its  Subsidiaries to preserve and
maintain, its existence,  rights,  franchises and privileges in the jurisdiction
of its  incorporation,  and qualify and remain qualified,  and cause each of its
Subsidiaries to qualify and remain qualified,  as a foreign  corporation in each
jurisdiction  in which  such  qualification  is  material  to the  business  and
operations of such Person or the ownership or leasing of the  properties of such
Person  except  to the  extent  that a  Subsidiary  merges  or  consolidates  in
compliance  with Section  6.08 or ceases to be a Subsidiary  of Borrower if such

HOU04:43581.4


<PAGE>




cessation is permitted under this Agreement.

                       Section  5.06.  Inspections.  From  time to  time  during
regular business hours upon reasonable  prior notice,  the Borrower will permit,
and will cause each of its Subsidiaries to permit, any agents or representatives
of any member of the Bank Group to examine and make copies of and abstracts from
the records and books of account of, and visit the  properties  of the  Borrower
and its  Subsidiaries  and to discuss the affairs,  finances and accounts of any
such  Person  with  any of  its  independent  public  accountants,  officers  or
directors, all at the expense of the Borrower.

                       Section 5.07.  Maintenance  of  Properties.  The Borrower
will  maintain and preserve,  and will cause each  Subsidiary of the Borrower to
maintain and preserve, all of its personal property and fixtures (or replacement
therefor) necessary for the proper conduct of its business in good working order
and  condition as would a reasonably  prudent  operator,  ordinary wear and tear
excepted.  The  Borrower  shall  cause,  or in the event the Borrower is not the
operator of its Oil and Gas Properties,  use reasonable best efforts  consistent
with its rights under applicable  operating agreements to cause, its Oil and Gas
Properties to be maintained,  developed, protected against drainage and operated
in a good and workmanlike  manner as would a reasonably  prudent operator and in
material compliance with all operating  agreements,  other applicable agreements
and all applicable Requirements of Law.

                       Section 5.08. Accounting Systems. The Borrower will keep,
and will cause each of its  Subsidiaries to keep,  adequate records and books of
account in which  complete  entries will be made in  accordance  with  generally
accepted  accounting  principles  consistently  applied  (subject  to  year  end
adjustments), reflecting all financial transactions of such Person. The Borrower
shall maintain or cause to be maintained a system of accounting  established and
administered in accordance with sound business  practices to permit  preparation
of  financial  statements  in  conformity  with  generally  accepted  accounting
principles,  and each of the  financial  statements  described  herein  shall be
prepared from such system and records.

                       Section  5.09.  Use of Loans and  Letters of Credit.  All
Letters of Credit shall be issued for general corporate purposes consistent with
the terms of this Agreement and all  Requirements  of Law. The Borrower will use
the proceeds of all Loans hereunder for general  corporate  purposes  (including
working  capital  purposes)  consistent with the terms of this Agreement and all
Requirements of Law.

                       Section 5.10.  Reserve  Reports.  (a) By March 15 of each
year commencing  March 15, 1997, the Borrower shall furnish to the Agent and the
Banks a Reserve Report dated as of the immediately  preceding  December 31. Each
Reserve Report shall be prepared by certified  independent  petroleum  engineers
acceptable to the Agent. Each such Reserve Report shall be in form and substance

HOU04:43581.4


<PAGE>




satisfactory to the Agent and shall set forth,  as of the immediately  preceding
December 31: (i) the Proved Reserves  attributable to the Borrower's Oil and Gas
Properties  together with a projection of the rate of production  and future net
income, taxes,  operating expenses and capital expenditures with respect thereto
as of such dates, based upon pricing and escalation  assumptions consistent with
SEC reporting  requirements  at the time and (ii) such other  information as the
Agent may reasonably  request.  By August 15 of each year commencing  August 15,
1997,  the Borrower  shall  furnish to the Agent and the Banks a Reserve  Report
dated as of the immediately preceding June 30. Each such Reserve Report shall be
prepared by or under the  supervision  of the chief engineer of the Borrower who
shall certify,  to the best of his knowledge and in all material respects,  such
Reserve  Report to be true and accurate and to have been  prepared in accordance
with the procedures used in the immediately  preceding  Reserve Report delivered
to the Banks under this Section 5.10(a).

                       (b) With respect to any  unscheduled  redetermination  of
the  Borrowing  Base  requested  by the Borrower in  connection  with a proposed
acquisition  of Oil and Gas  Properties  with a fair  market  value in excess of
$10,000,000,  the  Borrower  shall  furnish to the Bank  Group a Reserve  Report
prepared by certified  independent  petroleum engineers  acceptable to the Agent
covering the Oil and Gas Properties to be acquired. Such Reserve Report shall be
prepared in  accordance  with the  procedures  set forth in Section  5.10(a) and
contain such other information as the Agent may reasonably request. In the event
of any other  unscheduled  redetermination  of the Borrowing  Base, the Borrower
shall furnish to the Agent and the Banks a Reserve  Report  prepared by or under
the supervision of the chief engineer of the Borrower who shall certify,  to the
best of his knowledge and in all material  respects,  such Reserve  Report to be
true and accurate and to have been  prepared in accordance  with the  procedures
used in the immediately  preceding  Reserve Report  delivered to the Banks under
Section 5.10(a) with an "as of date" as requested by the Majority Banks. For any
unscheduled  redetermination  of the  Borrowing  Base  initiated by the Majority
Banks or the Agent,  the Borrower  shall provide such Reserve  Report as soon as
possible,  but in any  event  no later  than 30 days  following  the  Borrower's
receipt of notice of such unscheduled redetermination from the Agent.

                       (c)  With  the  delivery  of  each  Reserve  Report,  the
Borrower  shall provide to the Bank Group,  a certificate  from the  Responsible
Officer that, to the best of his knowledge and in all material respects, (i) the
information  contained in the Reserve Report and any other information delivered
therewith is true and correct,  (ii) the Borrower owns good and defensible title
to its Oil and Gas Properties evaluated in such Reserve Report free of all Liens
except for  Excepted  Liens and that the  Borrower  has created or allowed to be
created no new Liens on its Oil and Gas  Properties  except for Excepted  Liens,
(iii) except as set forth on an exhibit to the certificate, on a net basis there
are no gas imbalances,  take or pay or other prepayments with respect to its Oil
and Gas  Properties  evaluated  in such Reserve  Report which would  require the
Borrower to delivery  Hydrocarbons  produced from such Oil and Gas Properties at
some future time  without then or  thereafter  receiving  full payment  therefor

HOU04:43581.4


<PAGE>




exceeding a market value of $100,000 in the aggregate,  (iv) none of its Oil and
Gas Properties have been sold (other than Hydrocarbons  produced and sold in the
ordinary  course  of  business)  since  the  date  of the  last  Borrowing  Base
determination  except  as set  forth on an  exhibit  to the  certificate,  which
certificate  shall  list  all of its Oil and Gas  Properties  sold  (other  than
Hydrocarbons  produced and sold in the ordinary  course of business) and in such
detail as reasonably required by the Agent, (v) attached to the certificate is a
list of its Oil and Gas  Properties  added to and deleted  from the  immediately
prior Reserve  Report and an updated list of all Persons (with their  addresses)
disbursing proceeds to the Borrower from its Oil and Gas Properties, (vi) except
as set forth on a schedule  attached to the certificate,  all of the Oil and Gas
Properties  evaluated by such Reserve Report are Mortgaged  Property,  and (vii)
any  change in  working  interest  or net  revenue  interest  in its Oil and Gas
Properties  occurring  since the last  Reserve  Report  and the  reason for such
change.

                       (d) As soon as available  and in any event within 30 days
after the end of each month  commencing  with  November 30,  1996,  the Borrower
shall provide the Bank Group  production  reports for the Borrower's Oil and Gas
Properties and gas throughput  reports for the Guarantor's  gas plants,  in each
case,  certified by an officer of the  Borrower,  which  reports  shall  include
quantities or volume of production or gas  throughput  which have accrued to the
Borrower's or the Guarantors  accounts (as applicable) in such period,  and such
other information with respect thereto as the Agent may reasonably request.

                       (e) By March 15 of each year  commencing  March 15, 1997,
the Borrower  shall furnish to the Agent and the Banks a reserve report dated as
of the  immediately  preceding  December 31. Each such  reserve  report shall be
prepared by certified  independent  petroleum engineers acceptable to the Agent.
Each such reserve  report  shall be in form and  substance  satisfactory  to the
Agent and shall set forth, as of the immediately  preceding December 31: (i) the
Proved Reserves  attributable to the Guarantor's Oil and Gas Properties together
with a  projection  of the rate of  production  and  future net  income,  taxes,
operating  expenses and capital  expenditures  with  respect  thereto as of such
dates,  based  upon  pricing  and  escalation  assumptions  consistent  with SEC
reporting  requirements at the time and (ii) such other information as the Agent
may reasonably request.

                       Section 5.11. Title.  Promptly and in any event within 30
days after written request  therefor by the Agent, the Borrower will provide the
Agent with title opinions  reasonably  satisfactory to the Agent with respect to
the  Borrower's  Oil and Gas  Properties  which are  included in the most recent
Reserve Report delivered to the Bank Group and for which title opinions have not
been previously  delivered so that the Agent will have acceptable title opinions
on at least  eighty  percent  (80%) of the value of the  Borrower's  Oil and Gas
Properties included in such Reserve Report.

                       Section 5.12. Additional Collateral.  Should the Borrower
own additional  Oil and Gas Properties  that are not subject to a first priority
Lien  under  the  Security  Documents  or  acquire  any  additional  Oil and Gas

HOU04:43581.4


<PAGE>




Properties, the Borrower will grant to the Agent as security for the Obligations
a first  priority  Lien  (subject  only to  Excepted  Liens)  on the  Borrower's
interest in such Oil and Gas Properties which Lien will be created and perfected
by and in accordance with the provisions of mortgages,  deeds of trust, security
agreements and financing  statements,  or other Security Documents,  all in form
and substance satisfactory to the Agent in its sole discretion and in sufficient
executed (and  acknowledged  where  necessary or appropriate)  counterparts  for
recording  purposes.  Upon  written  request by the  Agent,  the  Borrower  will
immediately  execute and  deliver to the Agent  Security  Documents  in form and
substance  satisfactory  to the Agent  granting to the Agent as security for the
Obligations a first  priority  Lien (subject only to Excepted  Liens) on (a) all
notes  or  other  instruments  or  documents  evidencing  Indebtedness  of  each
Subsidiary of the Borrower owing to the Borrower that is permitted under Section
6.01(f) and (b) all Liens in favor of the Borrower securing such Indebtedness.

                       Section 5.13. Further Assurances in General. The Borrower
shall,  and shall  cause each of its  Subsidiaries  to,  protect and perfect the
Liens contemplated by the Security Documents. The Borrower at its expense shall,
and shall cause each of its  Subsidiaries  to, promptly  execute and deliver all
such other and further documents,  agreements and instruments in compliance with
or  accomplishment of the covenants and agreements of the Borrower or any of its
Subsidiaries  in  the  Loan  Documents,   including,   without  limitation,  the
accomplishment of any condition precedent that may have been waived by the Banks
prior to the initial Borrowing or Letter of Credit or any subsequent  Borrowings
or Letters of Credit.

                       Section 5.14. Enforcement of Acquisition  Documents.  The
Borrower  will  enforce in all material  respects  all of the terms,  covenants,
warranties and  representations  in favor of the Borrower under the  Acquisition
Documents.

                               ARTICLE VI
                           NEGATIVE COVENANTS

                       So long as any Letter of Credit remains outstanding,  any
principal  amount of any  reimbursement  obligation  in respect of any Letter of
Credit,  any principal  amount of any Loan, any amount of interest accrued under
the Notes or in respect of any Letter of Credit, or any commitment,  facility or
other fee,  expense,  compensation  or any other amount payable to any member of
the Bank Group under the Loan  Documents  shall remain unpaid or  outstanding or
any Bank shall have any  Commitment  hereunder,  unless the Majority Banks shall
otherwise consent in writing:

                       Section 6.01. Indebtedness Restriction. The Borrower will
not, and will not permit any of its  Subsidiaries to, create,  incur,  assume or
suffer to exist, any Indebtedness other than:

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<PAGE>



                       (a)  Indebtedness of the Borrower and the Guarantor under
the Loan Documents;

                       (b)  Indebtedness of the Borrower or its  Subsidiaries in
respect of any Derivatives permitted by Section 6.03;

                       (c) purchase money  Indebtedness for equipment or similar
items  purchased or leased in the  ordinary  course of business not to exceed in
the aggregate $2,000,000 outstanding at any time;

                       (d) the Bond Indebtedness;

                       (e) Indebtedness set out on Schedule 6.01;

                       (f)  Indebtedness  of Subsidiaries of the Borrower to the
Borrower  or to a  Wholly  Owned  Subsidiary  not to  exceed  $5,000,000  in the
aggregate  so long as such  Indebtedness  (i) is held only by the  Borrower or a
Wholly Owned  Subsidiary,  and (ii) is secured by Liens in favor of the Borrower
or a  Wholly  Owned  Subsidiary,  as  appropriate,  covering  Property  of  such
Subsidiary  with a fair market value equal to or in excess of the amount of such
Indebtedness.

                       (g)  Indebtedness  of  the  Borrower  to a  Wholly  Owned
Subsidiary  so long as such  Indebtedness  (i) is held  only by a  Wholly  Owned
Subsidiary and (ii) is unsecured and subordinated to the Obligations pursuant to
a written subordination agreement satisfactory to the Agent;

                       (h) Indebtedness under the CGGS Debentures, provided that
such  Indebtedness is repaid not later than five (5) days after the date of this
Agreement; and

                       (i)  Indebtedness of Borrower and its Subsidiaries in the
aggregate amount not to exceed $1,000,000 in addition to all other  Indebtedness
permitted by this Section 6.01.

                       Section 6.02.  Lien  Restriction.  The Borrower will not,
and will not permit any of its Subsidiaries to, create,  incur, assume or suffer
to be  created,  assumed  or  incurred  or to  exist,  any Lien upon any of such
Person's property or assets,  whether now owned or hereafter acquired other than
the following Liens ("Excepted Liens"):

                       (a) Liens created pursuant to this Agreement or any other
Loan Document;

                       (b)   royalties,   overriding   royalties,   reversionary
interests,   production  payments  and  similar  burdens  with  respect  to  the
Borrower's or its Subsidiaries Oil and Gas Properties to the extent such burdens
do not reduce the  Borrower's  net  interests in  production  in its Oil and Gas
Properties below the interests reflected in each Reserve Report or the interests

HOU04:43581.4


<PAGE>




warranted under this Agreement, the Existing Mortgage or the New Mortgage and do
not operate to deprive the Borrower or its  Subsidiaries  of any material rights
in respect of its assets or properties  (except for rights  customarily  granted
with respect to such interests);

                       (c) statutory  liens,  including liens for taxes or other
assessments  that are not yet  delinquent  (or that,  if  delinquent,  are being
contested in good faith by appropriate proceedings and for which the Borrower or
its Subsidiaries  have set aside on their books adequate  reserves in accordance
with generally accepted accounting principles consistently applied);

                       (d)  easements,  rights  of  way,  servitudes,   permits,
surface  leases and other  rights in respect to surface  operations,  pipelines,
grazing, logging, canals, ditches, reservoirs or the like, conditions, covenants
and other restrictions,  and easements of streets, alleys, highways,  pipelines,
telephone lines, power lines, railways and other easements and rights of way on,
over or in respect of the Borrower's or its Subsidiaries' assets or properties;

                       (e) materialmen's, mechanic's, repairman's, contractor's,
sub-contractor's,  operator's  and other Liens  incidental to the  construction,
maintenance,  development  or operation of the  Borrower's or its  Subsidiaries'
assets or properties to the extent not delinquent (or which, if delinquent,  are
being  contested  in good  faith by  appropriate  proceedings  and for which the
Borrower or its Subsidiaries  have set aside on their books adequate reserves in
accordance with generally accepted accounting principles consistently applied);

                       (f) all contracts,  agreements and  instruments,  and all
defects and  irregularities  and other matters  affecting the  Borrower's or its
Subsidiaries'  assets and  properties  which were in  existence at the time such
assets and properties  were  originally  acquired by such Person and all routine
operational  agreements  entered into in the ordinary course of business,  which
contracts,  agreements,  instruments,  defects, irregularities and other matters
and routine operational  agreements do not reduce the Borrower's net interest in
production in its Oil and Gas Properties  below the interests  reflected in each
Reserve Report or the interests  warranted  under this  Agreement,  the Existing
Mortgage or the New Mortgage and do not interfere materially with the operation,
value or use of the Borrower's or its Subsidiaries' assets and properties;

                       (g)    landlord's liens securing obligations that are not
yet  delinquent (or that, if  delinquent,  are being  contested in good faith by
appropriate  proceedings and for which the Borrower or its Subsidiaries have set
aside on their books adequate  reserves in accordance  with  generally  accepted
accounting principles consistently applied);

                       (h)  Liens in  connection  with  workmen's  compensation,
unemployment  insurance  or other  social  security,  old age  pension or public

HOU04:43581.4


<PAGE>




liability  obligations that are not yet delinquent (or that, if delinquent,  are
being  contested  in good  faith by  appropriate  proceedings  and for which the
Borrower or its Subsidiaries  have set aside on their books adequate reserves in
accordance with generally accepted accounting principles consistently applied);

                       (i) Liens securing purchase money Indebtedness  permitted
under  Section  6.01(c) but only to the extent such Liens cover the equipment or
other similar items purchased or leased;

                       (j) Liens in favor of the trustee  under  Section 7.07 of
the Bond Indenture;

                       (k) Lien in favor of Compass  Bank-San  Antonio  covering
certain  real  property in Comal  County,  Texas  described in that certain Real
Estate Lien Note,  dated  December  28,  1995,  issued by the  Borrower,  in the
principal  amount of  $238,500,  to the extent the Lien secures such Real Estate
Lien Note;

                       (l) Liens on any assets of any Subsidiary in favor of the
Borrower or the Guarantor;

                       (m) Liens in favor of the Frost  National Bank  ("Frost")
on  various  certificates  of  deposits  issued by Frost to the  Borrower  in an
original  principal  amount of $60,000,  which Liens secure  Indebtedness of the
Borrower  to Frost  pursuant  to the  letters of credit  issued by Frost for the
benefit of the Borrower that are described on Schedule 6.01;

                       (n) Any Lien reserved in a lease or farmout  agreement to
secure the payment of rents or royalties or other obligations under such farmout
agreement  or lease,  but only to the extent  that any such Lien  referred to in
this clause secures obligations not yet delinquent (or that, if delinquent,  are
being  contested  in good  faith by  appropriate  proceedings  and for which the
Borrower or its Subsidiaries  have set aside on their books adequate reserves in
accordance with generally accepted accounting  principles  consistently applied)
and encumbers the Property  covered by such lease or farmout  agreement and does
not materially  impair (i) the use of the Property  covered by such Lien for the
purposes for which such Property is held by the Borrower or any  Subsidiary,  or
(ii) the value of the Property subject thereto; and

                       (o) Liens in favor of  collecting or payor banks having a
right of  setoff,  revocation,  refund or  chargeback  with  respect to money or
instruments  of the Borrower or any  Subsidiary on deposit with or in possession
of such bank.

                       Section 6.03.  Derivatives.  The Borrower  shall not, and
shall not permit any of its  Subsidiaries  to, enter into any Derivatives  other
than (a) commodity price  Derivatives  presently  existing with  Christiania (b)
commodity price Derivatives  related to bona fide hedging  activities so long as
(i) the aggregate  notional amounts of such  Derivatives  during any calculation

HOU04:43581.4


<PAGE>




period  do  not  exceed  fifty  percent  (50%)  of  the   Borrower's   and  such
Subsidiaries'   projected  actual  production  of  Hydrocarbons  (based  on  the
projected  production of Proved Producing  Reserves reflected in the most recent
Reserve Report or reserve report delivered under Section 5.10(e), as applicable,
delivered  pursuant  hereto)  for such  period,  and (ii) such  commodity  price
Derivative  has been  entered  into with the Agent,  the  Co-Agent or such other
Person  agreed  to by the  Majority  Banks  and (c)  interest  rate and  foreign
exchange  Derivatives  entered  into with the Agent,  the  Co-Agent or otherwise
approved by the Majority Banks.

                       Section 6.04.  Interest Coverage Ratio. The Borrower will
not permit the ratio of (a) EBITDA to (b) Interest  Expense,  measured as of the
last day of any calendar  quarter for the twelve month period then ended,  to be
less than 1.50 to 1.00 as of the last day of any calendar  quarter  through June
30,  1997 or to be less  than  1.75 to 1.00 as of the last  day of any  calendar
quarter after June 30, 1997.

                       Section 6.05. Current Ratio. The Borrower will not permit
the ratio of (i) its consolidated  current assets,  including  amounts available
under  the  Commitments  based on the  Credit  Outstanding  and the most  recent
determination  of  the  Borrowing  Base,  to  (ii)  its   consolidated   current
liabilities, excluding the aggregate amount of Credit Outstanding, at the end of
any fiscal quarter to be less than 1.00 to 1.00.

                       Section 6.06.  Tangible Net Worth.  The Borrower will not
permit its  Consolidated  Tangible Net Worth to be less than  $30,000,000 at any
time.

                       Section 6.07. Sales of Assets. The Borrower will not, and
will not permit any of its Subsidiaries to, sell,  transfer,  assign,  farm-out,
lease or  otherwise  transfer  or dispose of any assets  other than (a) sales of
Hydrocarbon  production in the ordinary course of business and sales of obsolete
or worn-out equipment in the ordinary course of business, (b) sales or transfers
of assets by any of the Borrower's wholly-owned  Subsidiaries to the Borrower or
any such other wholly-owned Subsidiary,  (c) sale of the Gaelic Resources Stock,
and (d) any  other  sale of assets  sold at fair  market  value,  so long as the
aggregate  Net Proceeds for all such sales made under this  subclause (d) during
any  calendar  year does not  exceed  $2,000,000.  Upon  written  request of the
Borrower and provided no Event of Default  shall exist,  the Agent shall release
the Lien in favor of the Agent  covering  assets  sold by the  Borrower,  to the
extent  (and only to the extent)  the sale of such  assets was  permitted  under
subclause (d) of the preceding sentence.

                       Section  6.08.  Consolidation  and Mergers.  The Borrower
will  not,  and  will  not  permit  any  of its  Subsidiaries  to,  directly  or
indirectly,  consolidate  with or merge  into any Person or permit any Person to
consolidate  with or merge into it,  except that any  Subsidiary of the Borrower
may merge into or consolidate  with any other Subsidiary of the Borrower and any
Subsidiary  of the Borrower  may merge into or  consolidate  with the  Borrower,
provided in each case that, immediately after giving effect and pro forma effect

HOU04:43581.4


<PAGE>




thereto,  no event  shall occur and be  continuing  which  constitutes  either a
Default or an Event of Default,  and if the  Borrower is a party to such merger,
the Borrower is the surviving entity.

                       Section 6.09. Restricted Disbursements. The Borrower will
not,  and will not permit any of its  Subsidiaries  to approve,  make,  incur or
commit to incur any Restricted Disbursements other than:

                       (a) advances or extensions  of credit on terms  customary
in the  industry  involved  in the form of  accounts  receivable  incurred,  and
investments, loans, and advances made in settlement of such accounts receivable,
all in the ordinary course of business;

                       (b) Permitted Investments;

                       (c) Capital  Expenditures  by the Borrower to develop its
Proved  Reserves,  Capital  Expenditures by any Subsidiary to develop its Proved
Reserves,   and  additional  Capital   Expenditures  by  the  Borrower  and  its
Subsidiaries in an amount not to exceed  $5,000,000 in the aggregate  during any
six-month period commencing on any October 1 or April 1, as the case may be;

                       (d) preferred  stock dividends not to exceed $365,928 per
annum so long as no Event of Default has occurred and is  continuing or would be
caused by payment of such preferred stock dividend;

                       (e) dividends  paid by any  Subsidiary of the Borrower to
the Borrower or any of its  Subsidiaries  and any minority  shareholders of such
Subsidiary,  so  long  as  such  dividend  is  paid  at a  uniform  rate  to all
shareholders of such Subsidiary and no Event of Default would exist after giving
effect to such payment;

                       (f) the repayment of the CGGS Debentures Indebtedness;

                       (g) payments by the Borrower or any Subsidiary on account
of Indebtedness permitted under Section 6.01;

                       (h)  investments or capital  contributions  not to exceed
$2,000,000  in the  aggregate  made by the  Borrower  in or to any Wholly  Owned
Subsidiary; and

                       (i)  investments  or  capital  contributions  made by any
Subsidiary of the Borrower in or to the Borrower or any Wholly Owned Subsidiary.

                       Section 6.10.  Lines of Business.  The Borrower will not,
and will not permit any of its Subsidiaries to, directly or indirectly engage in
any business other than the  acquisition,  disposition,  exploration,  ownership
development  and  operation  of  Oil  and  Gas  Properties  and  the  gathering,

HOU04:43581.4


<PAGE>




marketing, treating, processing, storage and transporting of production from Oil
and Gas Properties.

                       Section 6.11.  Transactions with Affiliates.  Neither the
Borrower nor any of its  Subsidiaries,  will enter into any transaction  with an
Affiliate  other than (a)  transactions  entered into in the ordinary  course of
business  and upon terms no less  favorable  than those that the Borrower or its
Subsidiary,  as applicable,  could obtain in an arms length  transaction  with a
Person that is not an Affiliate  and (b)  transactions  between the Borrower and
any of its Subsidiaries, or between such Subsidiaries, that do not and will not,
either directly or indirectly, cause an Event of Default.


                              ARTICLE VII
                          DEFAULT AND REMEDIES

                       Section 7.01. Events of Default.  If any of the following
events ("Events of Default") shall occur and be continuing:

                       (a)  the  Borrower   shall  fail  to  pay  when  due  any
installment of principal of the Notes or any reimbursement obligation in respect
of any Letter of Credit; or

                       (b) the  Borrower  shall fail to pay any  interest on any
Loan or any arrangement fee,  commitment fee,  administration  fee, funding fee,
L/C Fee, commission,  expense, compensation,  reimbursement or other amount when
due; or

                       (c) the Borrower shall fail to perform any term, covenant
or agreement contained in Article VI, or Section 5.01(e) of this Agreement; or

                       (d) the Borrower shall fail to perform any term, covenant
or  agreement  contained  in this  Agreement  (other  than those  referenced  in
subsections  (a), (b) and (c) of this Section  7.01) and such failure  shall not
have been remedied  within thirty (30) days after notice  thereof from the Agent
to the Borrower; or

                       (e) the Borrower or the  Guarantor  shall fail to perform
any term, covenant or agreement contained in any Loan Document (other than those
referenced in  subsections  (a), (b), (c) and (d) of this Section 7.01) and such
failure  shall not have been  remedied  within  thirty  (30) days  after  notice
thereof from the Agent to the Borrower; or

                       (f) any  representation or warranty made by the Borrower,
or any of its officers,  in any Loan Document or in any certificate,  agreement,
instrument  or  statement  contemplated  by  or  delivered  pursuant  to,  or in

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<PAGE>




connection  with,  any Loan Document  shall prove to have been  incorrect in any
material respect when made; or

                       (g) the  Borrower  or any of its  Subsidiaries  shall (i)
fail to pay Indebtedness  having a principal amount in excess of $500,000 in the
aggregate (other than the amounts referred to in subsections (a) and (b) of this
Section 7.01) owing by such Person, or any interest or premium thereon, when due
(or, if permitted by the terms of the relevant  document,  within any applicable
grace period), whether such Indebtedness shall become due by scheduled maturity,
by required prepayment, by acceleration, by demand or otherwise; or (ii) fail to
perform any term,  covenant or condition  on its part to be performed  under any
agreement  or   instrument   evidencing,   securing  or  relating  to  any  such
Indebtedness,  when  required to be performed,  and such failure shall  continue
after the  applicable  grace  period,  if any,  specified  in such  agreement or
instrument,  if the effect of such  failure is to  accelerate,  or to permit the
holder or holders of such  Indebtedness  to  accelerate,  the  maturity  of such
Indebtedness; or

                       (h) any Loan Document  shall (other than with the consent
of the Majority Banks), at any time after its execution and delivery and for any
reason,  cease  to  be  in  full  force  and  effect  or to  provide  the  Liens
contemplated  thereby, or shall be declared to be null and void, or the validity
or  enforceability  thereof  or of  the  Liens  contemplated  thereby  shall  be
contested  by any Person  party to the Loan  Documents  or any such Person shall
deny that it has any or further liability or obligation under any Loan Document;
or

                       (i) the  Borrower  or any of its  Subsidiaries  shall  be
adjudicated  insolvent,  or shall  generally  not pay,  or admit in writing  its
inability to pay, its debts as they mature, or make a general assignment for the
benefit of creditors,  or any proceeding  shall be instituted by any such Person
seeking  to   adjudicate   it  insolvent,   seeking   liquidation,   winding-up,
reorganization, arrangement, adjustment, protection, relief or composition of it
or its debts under any law relating to bankruptcy,  insolvency or reorganization
or relief  of  debtors,  or  seeking  the  entry of an order  for  relief or the
appointment of a receiver,  trustee, or other similar official for it or for any
substantial  part of its  property,  or the Borrower or any of its  Subsidiaries
shall take any action in  furtherance  of any of the  actions set forth above in
this Section 7.01(i); or

                       (j) any  proceeding  of the type  referred  to in Section
7.01(i) is filed,  or any such  proceeding is commenced  against the Borrower or
any of its  Subsidiaries  or any such Person by any act  indicates  its approval
thereof,  consent  thereto or  acquiescence  therein,  or an order for relief is
entered in an involuntary case under the bankruptcy law of the United States, or
an  order,  judgment  or decree  is  entered  appointing  a  trustee,  receiver,
custodian,  liquidator  or similar  official  or  adjudicating  any such  Person
insolvent,  or approving the petition in any such  proceedings,  and such order,
judgment or decree remains in effect for sixty (60) days; or


HOU04:43581.4


<PAGE>



                       (k) a final judgment or order for the payment of money in
excess of $500,000 (net of acknowledged,  uncontested  insurance coverage) shall
be rendered against the Borrower or any of its  Subsidiaries  which has not been
discharged,  vacated or reversed and either (i)  enforcement  proceedings  shall
have been  commenced by any creditor  upon such judgment or order or (ii) a stay
of  enforcement  of such  judgment  or order by reason  of a  pending  appeal or
otherwise,  shall not be in effect  for any  period of thirty  (30)  consecutive
days;  or (l) if (i) any Pension Plan shall fail to satisfy the minimum  funding
standards  of  ERISA or the  Internal  Revenue  Code  for any plan  year or part
thereof or a waiver of such standards or extension of any amortization period is
sought or granted under section 412 of the Internal  Revenue Code, (ii) a notice
of intent  to  terminate  any  Pension  Plan  shall  have been or is  reasonably
expected to be filed with the PBGC or the PBGC shall have instituted proceedings
under Section 4042 of ERISA to terminate or appoint a trustee to administer  any
Pension Plan or the PBGC shall have notified the Borrower or any ERISA Affiliate
or Subsidiary that a Pension Plan may become a subject to any such  proceedings,
(iii) the aggregate "amount of unfunded benefit liabilities" (within the meaning
of  Section  4001(a)(18)  of  ERISA)  under all  Pension  Plans,  determined  in
accordance with Title IV of ERISA,  shall exceed $100,000,  (iv) the Borrower or
any ERISA Affiliate or Subsidiary shall have incurred or is reasonably  expected
to incur any liability pursuant to Title I or IV of ERISA, the penalty or excise
tax provisions of the Internal  Revenue Code relating to employee  benefit plans
and/or other liability with respect to one or more Other Benefit Plans,  (v) the
Borrower or any ERISA Affiliate or Subsidiary  withdraws from any  Multiemployer
Plan, (vi) the Borrower or any ERISA  Affiliate or Subsidiary  fails to make any
contribution  due, or payment to, any Pension  Plan,  Multiemployer  Plan and/or
Other Benefit  Plan, or (vii) the Borrower or any ERISA  Affiliate or Subsidiary
establishes  or  amends  any  employee   welfare   benefit  plan  that  provides
post-employment  welfare  benefits in a manner that would increase the liability
of the Borrower or any ERISA  Affiliate or Subsidiary  thereunder,  and any such
event  or  events   described  in  clauses  (i)  through  (vii)  above,   either
individually or together with any other such event or events,  could  reasonably
be expected to have a Material Adverse Effect; or

                       (m) any event which has a Material  Adverse  Effect shall
occur; or

                       (n) a Change of Control shall occur; or

                       (o) an  event  of  default  shall  occur  under  the Bond
Indenture;

then,  (i) upon the  occurrence  of any Event of  Default  described  in Section
7.01(i) or Section 7.01(j),  (A) the Commitments shall  automatically  terminate
and (B) the entire unpaid  principal  amount of all Loans,  all interest accrued
and unpaid  thereon,  and all other amounts  payable by the Borrower  under this
Agreement,  the  Notes,  the other Loan  Documents  and any other  agreement  or
security document contemplated by or delivered in connection with this Agreement

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shall automatically become immediately due and payable,  without presentment for
payment, demand, protest, notice of intent to accelerate, notice of acceleration
or further notice of any kind, all of which are hereby  expressly  waived by the
Borrower,  and the Agent may direct the beneficiary of any outstanding Letter of
Credit to make a drawing  under such Letter of Credit in an amount  equal to the
full  amount  available  thereunder  and  require  from the  Borrower  immediate
reimbursement  for  payments  made  pursuant to such  drawing,  or the Agent may
direct the Borrower to deposit with the Issuing Bank cash equal to the aggregate
amount of all  Outstanding  Letters  of Credit as  security  for the  Borrower's
obligations  in respect of such Letters of Credit,  and (ii) upon the occurrence
of any Event of Default,  the Agent may, and upon the  direction of the Majority
Banks  shall,  by notice to the  Borrower  (A)  declare  the  Commitments  to be
terminated,  whereupon  the same shall  forthwith  terminate and (B) declare the
entire unpaid  principal  amount of all Loans,  all interest  accrued and unpaid
thereon, and all other amounts payable by the Borrower under this Agreement, the
Notes,  the other Loan  Documents and any other  agreement or security  document
contemplated by or delivered in connection with this Agreement,  to be forthwith
due and payable,  whereupon  all such amounts  shall become and be forthwith due
and payable,  without presentment for payment, demand, protest, notice of intent
to  accelerate,  notice of  acceleration  or further  notice of any kind, all of
which are hereby expressly waived by the Borrower,  and the Agent may direct the
beneficiary  of any  outstanding  Letter of Credit to make a drawing  under such
Letter of Credit in an amount equal to the full amount available  thereunder and
require from the Borrower immediate  reimbursement for payments made pursuant to
such  drawing,  or the Agent may direct the Borrower to deposit with the Issuing
Bank cash equal to the aggregate amount of all Outstanding  Letters of Credit as
security for the Borrower's obligations in respect of such Letters of Credit.

                       Section  7.02.  Setoff  in  Event  of  Default.  Upon the
occurrence and during the  continuance  of any Event of Default,  each member of
the Bank Group is hereby authorized,  at any time and from time to time, without
notice to the Borrower (any such notice being expressly  waived by the Borrower)
and to the fullest extent  permitted by applicable  law, to setoff and apply any
and all  deposits at any time held and other  indebtedness  at any time owing by
such member of the Bank Group (or any branch,  subsidiary  or  affiliate of such
member of the Bank  Group) to or for the credit or the  account of the  Borrower
against any and all of the obligations of the Borrower or any other Person,  now
or  hereafter  existing  under  this  Agreement,  the  Notes or the  other  Loan
Documents,  irrespective  of whether or not such  member of the Bank Group shall
have made any demand for  satisfaction  of such  obligations  and although  such
obligations may be unmatured. Any member of the Bank Group exercising such right
agrees to notify the  Borrower  promptly  after any such setoff and  application
made by such  Person;  provided,  that the failure to give such notice shall not
affect the validity of such setoff and application. The rights of the Bank Group
under this Section 7.02 are in addition to other rights and remedies (including,
without  limitation,  other  rights of  setoff)  which  the Bank  Group may have
hereunder or under any applicable law.


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                       Section 7.03. No Waiver; Remedies. No failure on the part
of any member of the Bank Group to  exercise,  or any delay in  exercising,  any
right  hereunder  shall  operate  as a waiver  thereof,  nor shall any single or
partial  exercise of any right hereunder  preclude any other or further exercise
thereof or the  exercise  of any other  right.  The  remedies  provided  in this
Agreement are  cumulative  and not exclusive of any remedies  provided in any of
the other Loan Documents or by law.

                       Section 7.04. Hydrocarbon Proceeds. Notwithstanding that,
by the  terms  of the  various  Security  Documents,  Borrower  is and  will  be
absolutely and unconditionally assigning to the Agent for the ratable benefit of
the Banks all Hydrocarbons and all proceeds  therefrom  accruing to the interest
of the Borrower in the  Mortgaged  Property,  so long as no Event of Default has
occurred the Borrower  shall have the right  (revocable at any time by the Agent
upon the  occurrence  of an Event of Default) to receive from the  purchasers of
production all such Hydrocarbon proceeds, subject, however, to the Liens created
under the Security Documents, which Liens are hereby affirmed and ratified. Upon
the  occurrence  of an Event of Default,  the Agent may  exercise all rights and
remedies  granted  under the Security  Documents,  including the right to obtain
possession  of all such  Hydrocarbon  proceeds  then held by the  Borrower or to
receive  directly from the purchasers of production  all other such  Hydrocarbon
proceeds. In no case shall any failure, whether purposed or inadvertent,  by the
Agent to collect directly any such Hydrocarbon  proceeds constitute in any way a
waiver,  remission or release of any of its rights under the Security Documents,
nor shall  any  release  of any such  Hydrocarbon  proceeds  by the Agent to the
Borrower constitute a waiver, remission or release of any other such Hydrocarbon
proceeds  or of  any  rights  of  the  Agent  to  collect  other  such  proceeds
thereafter.

                       Section 7.05. Application of Proceeds After Acceleration.
If any Event of  Default  shall  have  occurred  and be  continuing,  and if the
Obligations  have become due and payable,  all cash collateral held by the Agent
under  this  Agreement  and the  proceeds  of any  sale,  disposition  or  other
realization  by the Agent upon the Mortgaged  Property (or any portion  thereof)
pursuant to the Security Documents,  shall be distributed in whole or in part by
the Agent in the following order of priority,  unless otherwise  directed by all
of the Banks:

                       First,  to the Agent  and the  Co-Agent,  ratably,  in an
      amount  equal to all costs and  expenses of the Agent and the Co-Agent due
      and payable as of the date of such distribution;

                       Second, to the Banks,  ratably, in an amount equal to all
      accrued  interest  and fees owing to the Banks under the Credit  Agreement
      due and payable as of the date of such  distribution;  provided,  however,
      that in case such proceeds shall be  insufficient  to pay in full all such
      Obligations,  then  to the  payment  thereof  to the  Banks,  ratably,  in
      proportion to its  percentage  of the sum of the aggregate  amounts of all
      such Obligations;


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<PAGE>



                       Third, to the Banks,  ratably,  in an amount equal to all
      unreimbursed  drawings  under the Letters of Credit owing to the Banks due
      and payable as of the date of such distribution;  provided,  however, that
      in case  such  proceeds  shall  be  insufficient  to pay in full  all such
      Obligations,  then  to the  payment  thereof  to the  Banks,  ratably,  in
      proportion to its  percentage  of the sum of the aggregate  amounts of all
      such Obligations;

                       Fourth, to the Banks,  ratably, in an amount equal to the
      principal of all Loans owing to the Banks under the Credit  Agreement  due
      and payable as of the date of such distribution;  provided,  however, that
      in case  such  proceeds  shall  be  insufficient  to pay in full  all such
      Obligations,  then  to the  payment  thereof  to the  Banks,  ratably,  in
      proportion to its  percentage  of the sum of the aggregate  amounts of all
      such Obligations;

                       Fifth, to the Agent as cash collateral in an amount equal
      to all Outstanding Letters of Credit;

                       Sixth, to the Banks,  ratably,  in an amount equal to all
      amounts  owing to the  Banks  under  all Bank  Group  Derivatives  due and
      payable as of the date of such distribution;  provided,  however,  that in
      case  such  proceeds  shall  be  insufficient  to pay  in  full  all  such
      Obligations,  then  to the  payment  thereof  to the  Banks,  ratably,  in
      proportion to its  percentage  of the sum of the aggregate  amounts of all
      such Obligations;

                       Seventh,  to the  Banks in an  amount  equal to all other
      Obligations due and payable as of the date of such distribution; provided,
      however,  that in case such proceeds shall be  insufficient to pay in full
      all such Obligations,  then to the payment thereof to the Banks,  ratably,
      in proportion to its percentage of the sum of the aggregate amounts of all
      such Obligations; and

                       Eighth, to the extent of any surplus, to the Borrower, as
its interests may appear, except as may be provided otherwise by law;

it being  understood  that the Borrower shall remain liable to the extent of any
deficiency  between the amount of the proceeds of the Mortgaged Property and the
aggregate of the sums referred to in clauses First through Seventh above.


HOU04:43581.4


<PAGE>



                              ARTICLE VIII
              THE AGENT, THE CO-AGENT AND THE ISSUING BANK

                       Section 8.01.  Authorization and Action. Each Bank hereby
appoints  and  authorizes  the Agent and the Issuing Bank to take such action in
such  capacity on such  Bank's  behalf and to  exercise  such powers  under this
Agreement  and the other Loan  Documents  as are  delegated  to the Agent or the
Issuing Bank by the terms hereof and thereof,  together  with such powers as are
reasonably  incidental  thereto. As to any matters not expressly provided for by
this Agreement (including, without limitation,  enforcement or collection of the
Notes or of amounts owing under the other Loan Documents), neither the Agent nor
the  Issuing  Bank shall be  required to  exercise  any  discretion  or take any
action,  but shall be  required  to act or to refrain  from acting (and shall be
fully protected in so acting or refraining from acting) upon the instructions of
the Majority Banks,  and such  instructions  shall be binding upon all Banks and
any other holders of Notes;  provided,  however,  that neither the Agent nor the
Issuing Bank shall be required to take any action  which  exposes it to personal
liability or which is contrary to the Loan Documents or applicable  law. Each of
the Agent and the Issuing Bank is hereby  expressly  authorized on behalf of the
other members of the Bank Group,  without hereby limiting any implied authority,
(a) to  receive  on behalf of each of the other  members  of the Bank  Group any
payment of  principal  of or interest on the Loans  outstanding  hereunder,  any
Letters of Credit and all other amounts accrued  hereunder paid to such Persons,
and  promptly to  distribute  to each other  member of the Bank Group its proper
share of all payments so received;  (b) to give notice within a reasonable  time
on behalf of each other  member of the Bank Group to the Borrower of any Default
or Event of Default  specified  in this  Agreement of which the Agent has actual
knowledge as provided in Section 8.09; (c) to distribute to the other members of
the Bank Group copies of all notices,  agreements and other material as provided
for in this  Agreement as received by such Person;  and (d) to distribute to the
Borrower any and all  requests,  demands and  approvals  received by such Person
from any other  member of the Bank  Group.  Nothing  herein  contained  shall be
construed  to  constitute  the Agent or the  Issuing  Bank as a trustee  for any
holder of the Notes or of a  participation  therein,  nor to impose on the Agent
any duties or obligations  other than those  expressly  provided for in the Loan
Documents.

                       Section  8.02.  Reliance,  Etc.  None of the  Agent,  the
Issuing Bank, their Affiliates and their respective directors,  officers, agents
or  employees  shall be liable for any action taken or omitted to be taken by it
or them under or in connection with this Agreement,  except for its or their own
gross negligence or willful misconduct.  Without limitation of the generality of
the  foregoing,  the Agent and the Issuing Bank:  (a) may treat the payee of any
Note as the holder  thereof  until the Agent  receives and accepts an Assignment
and  Acceptance  entered  into by the Bank which is the payee of such  Note,  as
assignor,  and an Eligible Assignee,  as assignee,  as provided in Section 9.02;
(b) may  consult  with  legal  counsel  (including  counsel  for the  Borrower),
independent public accountants and other experts selected by it and shall not be
liable  for any  action  taken or  omitted  to be  taken in good  faith by it in
accordance with the advice of such counsel, accountants or experts; (c) makes no

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<PAGE>




warranty or  representation to any Bank and shall not be responsible to any Bank
for any statements, warranties or representations (whether written or oral) made
in or in connection with this Agreement or the other Loan  Documents;  (d) shall
not have any duty to ascertain or to inquire as to the performance or observance
of any of the terms, covenants or conditions of this Agreement or the other Loan
Documents  on the part of the  Borrower  or any other  Person or to inspect  the
property  (including the books and records) of the Borrower or any other Person;
(e)  shall  not be  responsible  to any  Bank for the due  execution,  legality,
validity,  enforceability,   genuineness,  sufficiency  or  value  of  any  Loan
Document,  any  collateral  provided for  therein,  or any other  instrument  or
document furnished  pursuant thereto;  and (f) shall incur no liability under or
in respect of this Agreement by acting upon any notice, consent,  certificate or
other  instrument or writing  (which may be by  telecopier,  telegram,  cable or
telex)  believed by it to be genuine  and signed or sent by the proper  party or
parties.  None of the  Agent,  the  Issuing  Bank,  their  Affiliates  and their
respective   directors,   officers,   employees   or  agents   shall   have  any
responsibility to the Borrower on account of the failure or delay in performance
or  breach  by any Bank of any of its  obligations  hereunder  or to any Bank on
account of the failure of or delay in performance or breach by any other Bank or
the  Borrower of any of its  obligations  hereunder or in  connection  herewith;
provided,  however, that the foregoing shall not relieve BTCo of its obligations
as a Bank hereunder.

                       Section 8.03. BTCo and Affiliates.  Without  limiting the
right of any other Bank to engage in any business transactions with the Borrower
or any of its Affiliates,  with respect to its Commitment, the Loans made by it,
the Notes  issued to it and its interest in the  Outstanding  Letters of Credit,
Bankers Trust Company  ("BTCo") shall have the same rights and powers under this
Agreement  as any other Bank and may exercise the same as though it were not the
Issuing  Bank or the  Agent;  and the  term  "Bank"  or  "Banks"  shall,  unless
otherwise expressly indicated, include BTCo in its individual capacity. BTCo, or
any of its  Affiliates,  may be engaged in, or may  hereafter  engage in, one or
more loan, Letter of Credit,  leasing,  derivative or other financing activities
not the subject of the Loan  Documents  (collectively,  the "Other  Financings")
with the Borrower or any of its Affiliates,  or may act as trustee on behalf of,
or depositary for, or otherwise engage in other business  transactions  with the
Borrower or any of its Affiliates (all Other  Financings and other such business
transactions being collectively,  the "Other Activities") with no responsibility
to account  therefor to the Banks.  Without  limiting the rights and remedies of
the Banks specifically set forth in the Loan Documents, no other Bank shall have
any interest in (a) any Other Activities, (b) any present or future guarantee by
or for the  account of the  Borrower  not  contemplated  or included in the Loan
Documents,  (c) any present or future offset exercised by BTCo in respect of any
such Other Activities,  (d) any present or future property taken as security for
any such Other Activities or (e) any property now or hereafter in the possession
or control of BTCo which may be or become  security for the  obligations  of the
Borrower  under  the Loan  Documents  by reason of the  general  description  of
indebtedness  secured,  or of  property,  contained  in  any  other  agreements,
documents or instruments related to such Other Activities; provided, that if any

HOU04:43581.4


<PAGE>



payment in respect of such  guarantees or such property or the proceeds  thereof
shall be applied to reduction of the obligations  evidenced hereunder and by the
Notes,  then each Bank shall be entitled to share in such application  according
to its pro rata portion of such obligations.

                       Section   8.04.   Bank   Credit   Decision.   Each   Bank
acknowledges  that it has,  independently  and without  reliance  upon any other
member of the Bank Group and based on the  financial  statements  referred to in
Section  4.06  and  such  other  documents  and  information  as it  has  deemed
appropriate,  made its own  credit  analysis  and  decision  to enter  into this
Agreement.  Each Bank also acknowledges that it will,  independently and without
reliance upon any other member of the Bank Group and based on such documents and
information as it shall deem  appropriate at the time,  continue to make its own
credit decisions in taking or not taking action under this Agreement.

                       Section  8.05.   Indemnification.   The  Banks  agree  to
indemnify each of the Agent and the Issuing Bank,  the Co-Agent,  its Affiliates
or any of their  respective  directors,  officers,  agents or employees  (to the
extent not  reimbursed by the  Borrower),  ratably  according to its  Commitment
Percentages,  from and against  any and all  liabilities,  obligations,  losses,
damages, penalties,  actions, judgments, suits, costs, expenses or disbursements
of any kind or  nature  whatsoever  which may be  imposed  on,  incurred  by, or
asserted  against any such Person in any way  relating to or arising out of this
Agreement or the other Loan Documents or any action taken or omitted by any such
Person under this Agreement or the other Loan Documents,  provided, that no Bank
shall be  liable  for any  portion  of such  liabilities,  obligations,  losses,
damages, penalties,  actions, judgments, suits, costs, expenses or disbursements
resulting from such Person's gross negligence or willful  misconduct.  IT IS THE
EXPRESS  INTENTION  OF THE PARTIES  HERETO  THAT THE AGENT,  THE  CO-AGENT,  THE
ISSUING  BANK AND THEIR  AFFILIATES  AND THEIR  DIRECTORS,  OFFICERS,  AGENTS OR
EMPLOYERS  SHALL  BE  INDEMNIFIED   AND  HELD  HARMLESS   AGAINST  ANY  AND  ALL
LIABILITIES, OBLIGATIONS, LOSSES, DAMAGES, PENALTIES, ACTIONS, JUDGMENTS, SUITS,
COSTS,  EXPENSES OR  DISBURSEMENTS  OF ANY KIND ARISING OUT OF OR RESULTING FROM
THE ORDINARY NEGLIGENCE  (WHETHER SOLE OR CONTRIBUTORY) OF SUCH PERSON.  Neither
the Agent,  the Issuing  Bank nor the  Co-Agent  shall be required to do any act
hereunder or under any other  document or instrument  delivered  hereunder or in
connection  herewith or take any action toward the execution or  enforcement  of
the agencies  hereby  created,  or to prosecute or defend any suit in respect of
this  Agreement  or the  Loan  Documents  or  any  collateral  security,  unless
indemnified to its  satisfaction by the holders of the Notes against loss, cost,
liability,  and expense.  If any indemnity  furnished to the Agent,  the Issuing
Bank  and the  Co-Agent  for any  purpose  is,  in the  opinion  of such  Person
insufficient or becomes impaired,  such Person may call for additional indemnity
and not  commence  or  cease  to do the  acts  indemnified  against  until  such
additional  indemnity is furnished.  Without  limitation of the foregoing,  each
Bank agrees to reimburse  the Agent,  the Issuing Bank or the Co-Agent  promptly
upon  demand for its  ratable  share of any  out-of-pocket  expenses  (including

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<PAGE>




counsel  fees)  incurred  by such  Person in  connection  with the  preparation,
execution,  delivery,  administration,  modification,  amendment or  enforcement
(whether  through  negotiations,  legal  proceedings  or otherwise) of, or legal
advice in respect of rights or  responsibilities  under,  this Agreement and the
other Loan  Documents,  to the extent that the Agent,  the  Issuing  Bank or the
Co-Agent is not reimbursed for such expenses by the Borrower.

                       Section  8.06.  Employees  of the Agent  and the  Issuing
Bank. Each of the Agent and the Issuing Bank may execute any of their respective
duties  under this  Agreement,  the other  Loan  Documents  and any  instrument,
agreement or document  executed,  issued or delivered pursuant hereto or thereto
or in connection  herewith or  therewith,  by or through  employees,  agents and
attorneys-in-fact,  and shall not be answerable for the default or misconduct of
any such  employee,  agent or  attorney-in-fact  selected by it with  reasonable
care.  Each of the  Agent  and the  Issuing  Bank  may,  and  upon  the  written
instruction  of the  Majority  Banks  shall,  enforce on behalf of the Banks any
claims  which the Agent  and/or the Banks may have  against  any such  employee,
agent or  attorney-in-fact,  and any recovery therefrom shall be applied for the
pro rata benefit of the Banks.

                       Section 8.07.  Successor  Agent.  The Agent may resign at
any time by giving written notice thereof to the other members of the Bank Group
and the  Borrower  and may be removed  at any time with or without  cause by the
Majority Banks.  Upon any such resignation or removal,  the Majority Banks shall
have the right to appoint a successor  Agent.  If no successor  Agent shall have
been  so  appointed  by  the  Majority  Banks,  and  shall  have  accepted  such
appointment, within thirty (30) days after the retiring Agent's giving of notice
of resignation or the Majority  Banks' removal of the retiring  Agent,  then the
retiring  Agent may, on behalf of the Banks,  appoint a successor  Agent,  which
shall be a commercial bank or corporation organized under the laws of the United
States of America or of any State  thereof  and  having a combined  capital  and
surplus of at least  $500,000,000.  Upon the  acceptance of any  appointment  as
Agent  hereunder by a successor  Agent,  such  successor  Agent shall  thereupon
succeed to and become vested with all the rights, powers,  privileges and duties
of the retiring  Agent,  and the  retiring  Agent shall be  discharged  from its
duties and  obligations  under this Agreement,  subject to the requirement  that
such retiring  Agent will execute such documents and take such actions as may be
necessary or desirable to cause the  successor  Agent to be vested with all such
rights, powers, privileges and duties. After any retiring Agent's resignation or
removal  hereunder as Agent,  the provisions of this Article VIII shall inure to
its  benefit as to any  actions  taken or omitted to be taken by it while it was
Agent under this Agreement.  All reasonable  costs and expenses  incurred by the
Bank Group in connection with any amendments or other documentation  required by
this Section 8.07 shall be paid by the Borrower pursuant to Section 9.04 hereof.

                       Section 8.08.  Successor  Co-Agent and Successor  Issuing
Bank.  (a) The Co-Agent may resign at any time by giving  written notice thereof
to the other  members of the Bank Group and the  Borrower  and may be removed at
any time with or without cause by the Majority Banks. Upon any such resignation

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<PAGE>



or  removal,  the  Majority  Banks  shall have the right to appoint a  successor
Co-Agent.  If no successor Co-Agent shall have been so appointed by the Majority
Banks, and shall have accepted such  appointment,  within thirty (30) days after
the retiring  Co-Agent's  giving of notice of resignation or the Majority Banks'
removal of the retiring  Co-Agent,  then the retiring Co-Agent may, on behalf of
the Banks,  appoint a  successor  Co-Agent,  which  shall be a  commercial  bank
organized under the laws of the United States of America or of any State thereof
and having a combined  capital  and surplus of at least  $500,000,000.  Upon the
acceptance of any  appointment  as Co-Agent  hereunder by a successor  Co-Agent,
such successor  Co-Agent shall  thereupon  succeed to and become vested with all
the rights,  powers,  privileges  and duties of the retiring  Co-Agent,  and the
retiring Co-Agent shall be discharged from its duties and obligations under this
Agreement,  subject to the requirement that such retiring  Co-Agent will execute
such  documents  and take such actions as may be necessary or desirable to cause
the successor Co-Agent to be vested with all such rights, powers, privileges and
duties.  After any  retiring  Co-Agent's  resignation  or removal  hereunder  as
Co-Agent,  the  provisions of this Article VIII shall inure to its benefit as to
any actions taken or omitted to be taken by it while it was Co-Agent  under this
Agreement.  All  reasonable  costs and  expenses  incurred  by the Bank Group in
connection with any amendments or other  documentation  required by this Section
8.08 shall be paid by the Borrower pursuant to Section 9.04 hereof.

                       (b) The  Issuing  Bank may  resign  at any time by giving
written  notice  thereof to the other members of the Bank Group and the Borrower
and may be removed at any time with or without cause by the Majority Banks. Upon
any such  resignation  or removal,  the  Majority  Banks shall have the right to
appoint a successor  Issuing Bank. If no successor  Issuing Bank shall have been
so appointed by the Majority  Banks,  and shall have accepted such  appointment,
within  thirty (30) days after the retiring  Issuing  Bank's giving of notice of
resignation or the Majority  Banks' removal of the retiring  Issuing Bank,  then
the  retiring  Issuing  Bank may,  on behalf of the Banks,  appoint a  successor
Issuing Bank,  which shall be a commercial  bank or corporation  organized under
the laws of the United  States of America or of any state  thereof  and having a
combined  capital and surplus of at least  $500,000,000.  Upon the acceptance of
any  appointment  as Issuing Bank  hereunder by a successor  Issuing Bank,  such
successor Issuing Bank shall thereupon succeed to and become vested with all the
rights,  powers,  privileges  and duties of the retiring  Issuing Bank,  and the
retiring Issuing Bank shall be discharged from its duties and obligations  under
this Agreement,  subject to the requirement that such retiring Issuing Bank will
execute such documents and take such actions as may be necessary or desirable to
cause the  successor  Issuing  Bank to be vested with all such  rights,  powers,
privileges and duties.  Without  limiting the  generality of the foregoing,  the
Borrower,  the retiring  Issuing Bank and the successor  Issuing Bank will cause
each Letter of Credit issued by the retiring  Issuing Bank to be terminated  and
replaced by a Letter of Credit issued by the successor  Issuing Bank.  After any
retiring  Issuing Bank's  resignation or removal  hereunder as Issuing Bank, the
provisions  of this  Article  VIII shall  inure to its benefit as to any actions
taken  or  omitted  to be  taken by it while  it was  Issuing  Bank  under  this
Agreement.  All costs and expenses incurred by the Bank Group in connection with

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any amendments or other documentation  required by this Section 8.08(b) shall be
paid by the Borrower pursuant to Section 9.04 hereof.

                       Section 8.09.  Notice of Default.  The Agent shall not be
deemed to have  knowledge or notice of the occurrence of any Default or Event of
Default  hereunder  unless  it shall  have  received  notice  from a Bank or the
Borrower  referring  to this  Agreement,  describing  such  Default  or Event of
Default  and  stating  that such  notice is a "notice of  default" or "notice of
event of default," as  applicable.  If the Agent receives such a notice from the
Borrower,  the Agent shall give notice  thereof to the other members of the Bank
Group and, if such notice is received  from a Bank,  the Agent shall give notice
thereof to the other members of the Bank Group and the Borrower. The Agent shall
be entitled to take action or refrain  from taking  action with  respect to such
Default or Event of Default as provided in this Article VIII.

                       Section 8.10. Execution of Loan Documents. Each member of
the Bank Group hereby  authorizes  and directs the Agent and the Issuing Bank to
execute and deliver on its behalf each Loan Document to be executed by the Agent
pursuant to the terms of this Agreement.



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                               ARTICLE IX
                             MISCELLANEOUS

                       Section 9.01. Amendments,  Etc. No amendment or waiver of
any provision of this Agreement, any Note or any other Loan Document, or consent
to any  departure  by any Person  herefrom or  therefrom,  shall in any event be
effective unless the same shall be in writing and signed by the Borrower and the
Majority  Banks,  and then such waiver or consent shall be effective only in the
specific instance and for the specific purpose for which given;  provided,  that
no amendment,  waiver or consent shall,  unless in writing and signed by all the
Banks,  do any of the following:  (a) waive any of the  conditions  specified in
Article III, (b) increase the  Commitments  of the Banks or subject the Banks to
any  additional  obligations,  (c) reduce the  principal of, or interest on, the
Notes, the reimbursement  obligations in respect of the Letters of Credit or any
fees or other  amounts  payable  hereunder,  (d) postpone any date fixed for any
payment  of  principal  of,  or  interest  on,  the  Notes,  the   reimbursement
obligations  in  respect of the  Letters of Credit or any fees or other  amounts
payable hereunder, (e) release the Borrower or any other Person from its payment
obligations to the Bank Group,  regardless of whether such obligations are those
of a primary  obligor,  a guarantor or surety,  or otherwise,  (f) authorize the
Agent to release Liens against a substantial  portion of any collateral  covered
by the Security Documents,  (g) take action which expressly requires the signing
of all the  Banks  pursuant  to the  terms of this  Agreement,  (h)  reduce  the
Commitment Percentages or the aggregate unpaid principal amount of the Notes, or
the number of Banks,  as the case may be,  required  for the Agent,  the Issuing
Bank or the Banks or any of them to take any  action  under  this  Agreement  or
reduce  the  percentage  of  Majority  Banks or (i)  amend  this  Section  9.01;
provided,  further,  that no  amendment,  waiver or consent  shall (1) unless in
writing and signed by the  Co-Agent in addition to the Banks  required  above to
take such  action,  affect  the  rights or duties  of the  Co-Agent  under  this
Agreement or any other Loan Document and (2) unless in writing and signed by the
Issuing Bank in addition to the Banks required above to take such action, affect
the rights or duties of the Issuing  Bank under this  Agreement,  the Letters of
Credit,   Letter  of  Credit   Applications,   or  any  other   Loan   Document.
Notwithstanding the foregoing,  the Agent may (without the consent of the Banks)
release  the Lien  created  under the  Security  Documents  on any assets of the
Borrower  or any of its  Subsidiaries  if the sale of such  assets is  permitted
under Section 6.07.

                       Section 9.02.  Participation  Agreements and Assignments.
(a) Each Bank may assign to one or more  Eligible  Assignees all or a portion of
its rights and obligations under this Agreement (including,  without limitation,
all or a portion of its  Commitment  and the Loans  owing to it, the Note or the
Notes  held by it, its  interest  in the  Outstanding  Letters of Credit and the
other Loan  Documents);  provided,  that (i) each such assignment  shall be of a
constant,  and not a varying,  percentage of all rights and  obligations  of the
assignor  under this Agreement and the other Loan  Documents,  and no assignment
shall be made unless it covers a pro rata share of all rights and obligations of
such assignor under this Agreement and the other Loan Documents, (ii) the amount
of the  Commitment of the assigning  Bank being  assigned  pursuant to each such

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assignment  (determined as of the date of the  Assignment  and  Acceptance  with
respect to such  assignment)  shall,  unless otherwise agreed to by the Agent or
unless such  assignment  is to a member of the Bank  Group,  in no event be less
than $5,000,000, (iii) each such assignment to an Eligible Assignee who is not a
member of the Bank Group must be  approved  by the Agent and (iv) the parties to
each such assignment  shall execute and deliver to the Agent, for its acceptance
and recording in the Register  (defined  below),  an Assignment and  Acceptance,
together with any Note subject to such  assignment and a recordation  fee in the
amount of $3,500 for processing such assignment. Upon such execution,  delivery,
acceptance  and  recording,  from and after the effective date specified in each
Assignment and Acceptance,  (x) the assignee  thereunder shall be a party hereto
and, to the extent that rights and  obligations  under the Loan  Documents  have
been assigned to it pursuant to such Assignment and Acceptance,  have the rights
and  obligations  of a Bank under the Loan  Documents,  (y) the  assigning  Bank
thereunder  shall,  to the extent  that  rights and  obligations  under the Loan
Documents have been assigned by it pursuant to such  Assignment and  Acceptance,
relinquish  its rights and be released from further  obligations  under the Loan
Documents (and, in the case of an Assignment and Acceptance  covering all or the
remaining  portion of an  assigning  Bank's  rights and  obligations  under this
Agreement, such Bank shall cease to be a party hereto) and (z) be deemed to have
made,  as  of  such   effective   date,  to  the  Agent  and  the  Borrower  the
representations and warranties set forth in Section 2.12(f) hereof.

                       (b)  By  executing  and   delivering  an  Assignment  and
Acceptance, the assigning Bank thereunder and the assignee thereunder confirm to
and agree with each other and the other  parties  hereto as  follows:  (i) other
than as provided in such Assignment and Acceptance, such assigning Bank makes no
representation  or warranty  and assumes no  responsibility  with respect to any
statements, warranties or representations made in or in connection with the Loan
Documents or the execution,  legality,  validity,  enforceability,  genuineness,
sufficiency  or value of this  Agreement  or any other  instrument  or  document
furnished  pursuant hereto;  (ii) such assigning Bank makes no representation or
warranty and assumes no responsibility  with respect to the financial  condition
of the  Borrower or any other Person or the  performance  or  observance  by the
Borrower or any other Person of any of its  obligations  under this Agreement or
any other instrument or document furnished pursuant hereto;  (iii) such assignee
confirms  that it has  received  a copy of this  Agreement  and the  other  Loan
Documents,  together  with  copies of the  financial  statements  referred to in
Section  4.06  and  such  other  documents  and  information  as it  has  deemed
appropriate  to make its own credit  analysis  and  decision  to enter into such
Assignment and Acceptance;  (iv) such assignee will,  independently  and without
reliance upon any member of the Bank Group  (including  such assigning Bank) and
based on such  documents and  information  as it shall deem  appropriate  at the
time,  continue to make its own credit  decisions in taking or not taking action
under  this  Agreement;  (v)  such  assignee  confirms  that  it is an  Eligible
Assignee;  (vi) such assignee  appoints and authorizes the Agent and the Issuing
Bank,  to take such action on its behalf and to exercise  such powers under this
Agreement  and the other Loan  Documents as are  delegated to such Person by the

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<PAGE>




terms thereof,  together with such powers as are reasonably  incidental thereto;
and (vii) such  assignee  agrees that it will perform in  accordance  with their
terms all of the obligations  which by the terms of this Agreement and the other
Loan Documents are required to be performed by it as a Bank.

                       (c) The Agent shall  maintain at its address  referred to
in  Section  9.03 a copy of each  Assignment  and  Acceptance  delivered  to and
accepted by it and a register for the  recordation of the names and addresses of
the Banks and the  Commitment  of, and  principal  amount of the Loans owing to,
each Bank from time to time (the "Register").  The entries in the Register shall
be  conclusive  and binding for all purposes,  absent  manifest  error,  and the
Borrower  and each member of the Bank Group may treat each Person  whose name is
recorded in the Register as a Bank hereunder for all purposes of this Agreement.
The Register  shall be available for inspection by the Borrower or any member of
the Bank  Group at any  reasonable  time and from time to time  upon  reasonable
prior notice.

                       (d) Upon its  receipt  of an  Assignment  and  Acceptance
executed  by an  assigning  Bank  and an  assignee  representing  that  it is an
Eligible  Assignee,  together with any Notes subject to such  assignment and the
administrative fee payable to the Agent for such assignment, the Agent shall, if
such  Assignment and Acceptance has been completed and is in  substantially  the
form of Exhibit 9.02 hereto,  (i) accept such  Assignment and  Acceptance,  (ii)
record the information  contained  therein in the Register and (iii) give prompt
notice thereof to the Borrower.  Within five (5) Business Days after its receipt
of such notice, the Borrower,  at its own expense,  shall execute and deliver to
the Agent, in exchange for the surrendered Notes, new Notes to the order of such
Eligible Assignee in an amount  corresponding to the Commitment  assumed by such
Eligible  Assignee  pursuant  to such  Assignment  and  Acceptance  and,  if the
assigning  Bank has retained a Commitment  hereunder,  new Notes to the order of
the assigning Bank in an amount  corresponding to the Commitment  retained by it
hereunder. Such new Notes shall be in an aggregate principal amount equal to the
aggregate  principal  amount  of such  surrendered  Notes,  shall be  dated  the
effective  date of such  Assignment  and  Acceptance  and shall  otherwise be in
substantially the form prescribed by Section 2.05 hereto.

                       (e)  Each  Bank may  sell  participations  to one or more
banks or other entities in or to all or a portion of its rights and  obligations
under this Agreement  (including,  without  limitation,  all or a portion of its
Commitment and the Loans owing to it and its interest in the Outstanding Letters
of Credit);  provided,  that (i) such Bank's  obligations  under this  Agreement
(including,  without  limitation,  its Commitment to the Borrower hereunder) and
the other Loan  Documents  shall remain  unchanged,  (ii) such Bank shall remain
solely  responsible  to the other  parties  hereto for the  performance  of such
obligations,  and  the  participating  banks  or  other  entities  shall  not be
considered a "Bank" for purposes of the Loan Documents,  (iii) the participating
banks or other  entities  shall be  entitled to the cost  protection  provisions
contained  in Sections  2.11  through 2.14 to the same extent that the Bank from

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<PAGE>




which such participating  bank or other entity acquired its participation  would
be  entitled  to the  benefit  of such cost  protection  provisions,  so long as
Borrower is not obligated to pay any amount under such Sections in excess of the
amount  that  would  have  been  due to such  Bank  under  such  Sections  if no
participations  had been made by such Bank,  and (iv) the Borrower and the other
members of the Bank Group shall  continue to deal solely and directly  with such
Bank in connection with such Bank's rights and obligations  under this Agreement
and the other  Loan  Documents,  and such Bank  shall  retain  the sole right to
enforce the obligations of the Borrower relating to the Loans and the Letters of
Credit and to approve any amendment,  modification or waiver of any provision of
this Agreement (other than amendments,  modifications or waivers with respect to
the amounts of any fees  payable  hereunder or the amount of principal of or the
rate  at  which  interest  is  payable  on  the  Loans  or  the  amount  of  any
reimbursement  obligations  payable  with respect to any Letter of Credit or the
dates fixed for payments of principal or interest on the Loans or  reimbursement
obligations in respect of any Letters of Credit).

                       (f) Any Bank may at any time  pledge or assign all or any
portion of its rights under this  Agreement and the other Loan  Documents to any
Federal  Reserve  Bank  without  notice to or consent of the  Borrower.  No such
pledge or  assignment  shall  release the  assigning  Bank from its  obligations
hereunder.

                       (g) The Agent, the Issuing Bank and each Bank may furnish
any information concerning the Borrower or its Subsidiaries in the possession of
the Agent or such Bank from time to time to Affiliates of the Agent or such Bank
(including  without  limitation,  in the  case  of  Bankers  Trust  Company,  BT
Securities  Corporation  and its  employees,  to the  extent  necessary  for the
purposes  contemplated by this Agreement,  including,  without  limitation,  the
syndication of the credit  facilities  contemplated  hereby) and, in the case of
each Bank, to assignees and participants  (including  prospective  assignees and
participants)  of such Bank. Each Bank will take reasonable steps to protect the
confidentiality  of any information  concerning the Borrower or its Subsidiaries
provided to a  respective  participant  or assignee and known by such Bank to be
confidential,  and, if requested by the  Borrower,  such Bank will  identify the
prospective assignees and participants that have received such information.

                       Section 9.03. Notices.  All  correspondence,  statements,
notices,  requests  and  demands  (collectively  "Communications")  shall  be in
writing  (including   telegraphic   Communications)  and  mailed,   telegraphed,
telecopied, facsimile transmitted or delivered as follows:

      if to the Borrower --

                       Abraxas Petroleum Corporation
                       500 North Loop 1604 East, Suite 100
                       San Antonio, Texas 78232
                       Attention: Robert L.G. Watson
                       Telecopier: (210) 490-8816

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<PAGE>




      if to the Issuing Bank or the Agent--

                       Bankers Trust Company
                       130 Liberty Street, 14th Floor
                       New York, New York 10006
                       Attention:  James T. Cullen
                       Telecopier: (212) 250-6029 or (212) 250-7351

      with a copy to --

                       BT Southwest, Inc.
                       909 Fannin Street, Suite 3000
                       Houston, Texas 77010
                       Attention: Roberta Bohn
                       Telecopier: (713) 759-6708

if to any Bank, at its Domestic  Lending  Office,  or as to each such party,  at
such other address as such party shall designate in a written  Communication  to
each of the other parties hereto. All such Communications shall be effective, in
the case of written or telegraphed  Communications,  when deposited in the mails
or  delivered  to the  telegraph  company,  respectively,  and, in the case of a
Communication  by  telecopy  or  facsimile  transmission,   when  telecopied  or
transmitted  against  receipt  of a  confirmation,  in each  case  addressed  as
aforesaid,  except that  Communications to any member of the Bank Group pursuant
to Article II and Article  VIII shall not be  effective  until  received by such
Persons.

                       Section 9.04. Costs and Expenses.  The Borrower agrees to
pay promptly (a) all reasonable costs and expenses  (including fees and expenses
of legal  counsel)  of any of the  Agent,  the  Co-Agent  and the  Issuing  Bank
incurred  in  connection  with the  preparation,  execution,  delivery,  filing,
administration  and recording of the Loan Documents and any other  agreements or
security  documents  delivered in connection with or pursuant to any of the Loan
Documents and the  syndication  of this Agreement both before and after the date
hereof,  and (b) all  reasonable  costs and  expenses  of any member of the Bank
Group incurred in connection  with the enforcement of the Loan Documents and any
other agreements or security  documents  executed in connection with or pursuant
to any of the Loan Documents, including, but not limited to, the reasonable fees
and  out-of-pocket  expenses of counsel  for any member of the Bank  Group,  and
local counsel who may be retained by such counsel, with respect thereto, and the
costs  and  expenses  in  connection  with  the  custody,  preservation,  use or
operation of, or the sale of, or collection from, or other  realization upon the
sale of, or collection from, or other realization upon any collateral covered by
any of the other documents executed in connection with or pursuant to any of the
Loan Documents.  The agreements of Borrower contained in this Section 9.04 shall
survive the  termination of the Commitments and the payment of all other amounts
owing hereunder or under any of the other Loan Documents.

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                       Section  9.05.  Successors  and Assigns.  This  Agreement
shall be binding upon and inure to the benefit of the Borrower,  the Agent,  the
Issuing Bank, the Banks and their respective successors and assigns, except that
the Borrower may not assign or transfer its rights  hereunder  without the prior
written consent of the Banks.

                       Section 9.06.  Independence  of Covenants.  All covenants
contained in the Loan Documents shall be given  independent  effect so that if a
particular  action or condition is not permitted by any of such  covenants,  the
fact that such action or condition  would be  permitted  by an exception  to, or
otherwise be within the  limitations  of,  another  covenant shall not avoid the
occurrence  of a  Default  or an Event of  Default  if such  action  is taken or
condition exists.

                       Section 9.07. Survival of Representations and Warranties.
All  representations  and  warranties  contained in this Agreement and the other
Loan Documents or made in writing by the Borrower or the Guarantor in connection
herewith  or  therewith,  shall  survive  the  execution  and  delivery  of this
Agreement, the Notes and the other Loan Documents, the expiration of the Letters
of Credit and the repayment of the Loans. Any investigation by any member of the
Bank Group shall not  diminish in any  respect  whatsoever  its right to rely on
such representations and warranties.

                       Section 9.08. Separability.  Should any clause, sentence,
paragraph,  subsection,  Section  or  Article of this  Agreement  be  judicially
declared to be invalid,  unenforceable  or void, such decision will not have the
effect of  invalidating  or voiding the  remainder  of this  Agreement,  and the
parties  hereto  agree  that the part or parts of this  Agreement  so held to be
invalid,  unenforceable or void will be deemed to have been stricken herefrom by
the parties hereto, and the remainder will have the same force and effectiveness
as if such stricken part or parts had never been included herein.

            Section 9.09.  Captions.  The captions in this  Agreement  have been
inserted  for  convenience  only and shall be given no  substantive  meaning  or
significance   whatsoever  in  construing  the  terms  and  provisions  of  this
Agreement.

            Section 9.10.  Counterparts.  This  Agreement may be executed in any
number of counterparts and by different parties hereto in separate counterparts,
each of which when so  executed  shall be deemed to be an  original,  and all of
which taken together shall constitute one and the same agreement.

            Section 9.11.  Governing Law. THIS AGREEMENT (INCLUDING THE VALIDITY
AND  ENFORCEABILITY  HEREOF)  SHALL BE GOVERNED BY, AND  CONSTRUED IN ACCORDANCE
WITH,  THE LAWS OF THE STATE OF NEW YORK.  Chapter 15,  Subtitle 3, Title 79, of
the Revised Civil  Statutes of Texas,  1925,  as amended  (relating to revolving
loans and revolving triparty accounts), shall not apply to this Agreement or the
Notes or the transactions contemplated hereby.


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            Section 9.12.  Submission to  Jurisdiction.  (a) The Borrower hereby
irrevocably  submits  to the  non-exclusive  jurisdiction  of any New York state
court  located in the Borough of  Manhattan,  City and State of New York, or any
federal  court  located in the Southern  District of New York over any action or
proceeding arising out of or relating to this Agreement or any of the other Loan
Documents,  and each of the  Borrower  irrevocably  agrees  that all  claims  in
respect of such action or  proceeding  may be heard and  determined  in such New
York state or federal court; provided,  nothing in this Section 9.12 is intended
to waive the right of any member of the Bank Group to remove any such  action or
proceeding commenced in any such New York state court to an appropriate New York
federal court to the extent the basis for such removal  exists under  applicable
law. The Borrower  hereby  irrevocably  appoints CT  Corporation  (the  "Process
Agent"), with an office on the date hereof at 1633 Broadway,  New York, New York
10019,  as its agent to  receive on behalf of it and its  properties  service of
copies of the summons and complaint and any other process which may be served in
any such action or proceeding.  Such service may be made by mailing by certified
mail a copy of such process to the Borrower in care of the Process  Agent at the
Process  Agent's  above  address,  with a copy to  such  Person  at its  address
specified  herein and each of the Borrower  hereby  irrevocably  authorizes  and
directs  the  Process  Agent  to  accept  such  service  on  its  behalf.  As an
alternative method of service, each of the Borrower also irrevocably consents to
the  service of any and all  process  in any such  action or  proceeding  by the
mailing  by  certified  mail of  copies  of such  process  to it at its  address
specified  herein.  The Borrower agrees that a final judgment in any such action
or proceeding shall be conclusive and may be enforced in other  jurisdictions by
suit on the judgment or in any other manner provided by law.

            (b)  Nothing  in this  Section  9.12  shall  affect the right of any
member of the Bank Group to serve legal process in any other manner permitted by
law or affect  the right of any  member of the Bank Group to bring any action or
proceeding against the Borrower,  or such Person's properties,  in the courts of
any other jurisdiction.

                       Section 9.13.  Limitation on Interest.  Each provision in
this  Agreement and each other Loan Document is expressly  limited so that in no
event  whatsoever  shall the amount paid, or otherwise agreed to be paid, by the
Borrower for the use,  forbearance  or detention of the money to be loaned under
this Agreement or any other Loan Document or otherwise  (including any sums paid
as required by any covenant or obligation  contained herein or in any other Loan
Document which is for the use,  forbearance or detention of such money),  exceed
that amount of money which would cause the effective  rate of interest to exceed
the Highest  Lawful  Rate,  and all amounts owed under this  Agreement  and each
other Loan Document  shall be held to be subject to reduction to the effect that
such amounts so paid or agreed to be paid which are for the use,  forbearance or
detention of money under this  Agreement or such Loan Document shall in no event
exceed that amount of money which would cause the effective  rate of interest to
exceed the Highest  Lawful  Rate.  To the extent  that the  Highest  Lawful Rate
applicable to a Bank is at any time  determined by Texas law, such rate shall be
the  "indicated  rate  ceiling"  described in Section  (a)(1) of Article 1.04 of

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Chapter 1, Subtitle 1, Title 79, of the Revised Civil  Statutes of Texas,  1925,
as amended;  provided,  to the extent permitted by such Article,  the Banks from
time to time by notice  from the Agent to  Borrower  may  revise  the  aforesaid
election of such interest rate ceiling as such ceiling affects the  then-current
or future balances of the Loans outstanding under the Notes. Notwithstanding any
provision in this  Agreement or any other Loan Document to the contrary,  if the
maturity of the Notes or the  obligations in respect of the other Loan Documents
are  accelerated  for any reason,  or in the event of  prepayment  of all or any
portion of the Notes or the  obligations  in respect of the other Loan Documents
by the  Borrower or in any other  event,  earned  interest on the Loans and such
other  obligations of the Borrower may never exceed the maximum amount permitted
by applicable law, and any unearned  interest  otherwise payable under the Notes
or the  obligations  in respect of the other Loan Documents that is in excess of
the maximum amount permitted by applicable law shall be cancelled  automatically
as of the date of such  acceleration  or  prepayment or other such event and, if
theretofore  paid,  shall be credited on the  principal  of the Notes or, if the
principal  of the  Notes  has been  paid in  full,  held as  collateral  for any
contingent  or  unmatured  obligation  of the  Borrower,  or,  if  there  are no
contingent or unmatured  obligations of the Borrower then outstanding,  refunded
to the  Borrower.  In  determining  whether or not the interest paid or payable,
under any specific  contingency,  exceeds the Highest  Lawful Rate, the Borrower
and the  Banks  shall,  to the  maximum  extent  permitted  by  applicable  law,
amortize,  prorate, allocate and spread, in equal parts during the period of the
actual term of this Agreement, all interest at any time contracted for, charged,
received or reserved in connection with this Agreement.

                       Section  9.14.  Indemnification.  The Borrower  agrees to
indemnify,  defend and hold the Agent,  the Co-Agent and each member of the Bank
Group,  their  Affiliates  and their  officers,  employees,  agents,  directors,
shareholders and Affiliates (collectively,  "Indemnified Persons") harmless from
and against any and all loss, liability,  damage, judgment, claim, deficiency or
reasonable expense (including interest,  penalties,  reasonable  attorneys' fees
and amounts paid in settlement)  incurred by or asserted against any Indemnified
Person  arising  out of, in any way  connected  with,  or as a result of (i) the
execution and delivery of this  Agreement and the other  documents  contemplated
hereby,  the  performance by the parties  hereto and thereto of its  obligations
hereunder  and  thereunder  (including  but not  limited  to the  making  of the
Commitments  of each Bank) and  consummation  of the  transactions  contemplated
hereby and thereby,  (ii) the actual or proposed use of the Letters of Credit or
the  proceeds of the Loans,  (iii) any  violation  by the Borrower or any of its
Subsidiaries  of  any   Requirement  of  Law,   including  but  not  limited  to
Environmental  Laws,  (iv)  ownership  by the Bank Group of any real or personal
property following foreclosure under the Security Documents,  to the extent such
losses, liabilities,  damages, judgments, claims, deficiencies or expenses arise
out of or  result  from the  presence,  disposal  or  release  of any  hazardous
materials or solid waste in, on or under such property  during the period owned,
leased  or  operated  by the  Borrower  or any of its  Subsidiaries,  including,
without   limitation,   losses,   liabilities,   damages,   judgments,   claims,
deficiencies or expenses which are imposed under Environmental Laws upon Persons
by virtue of their  ownership,  (v) any member of the Bank Group being deemed an

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operator of any such real or  personal  property  in  circumstances  in which no
member of the Bank Group is generally operating or generally  exercising control
over such property, to the extent such losses, liabilities,  damages, judgments,
claims,  deficiencies  or  expenses  arise out of or result  from any  hazardous
materials  or solid  waste  located  in, on or under such  property  or (vi) any
claim, litigation, investigation or proceeding relating to any of the foregoing,
whether or not any  Indemnified  Person is a party  thereto;  provided that such
indemnity shall not apply to any such losses,  claims,  damages,  liabilities or
related  expenses that are  determined by a court of competent  jurisdiction  by
final and  nonappealable  judgment to have resulted from the gross negligence or
willful misconduct of such Indemnified Person. WITHOUT LIMITING ANY PROVISION OF
THIS AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS,  IT IS THE EXPRESS  INTENTION
OF THE  BORROWER  THAT EACH  INDEMNIFIED  PERSON SHALL BE  INDEMNIFIED  AND HELD
HARMLESS  AGAINST  ANY  AND  ALL  LOSSES,  LIABILITIES,   CLAIMS,  DEFICIENCIES,
JUDGMENTS OR REASONABLE  EXPENSES  ARISING OUT OF OR RESULTING FROM THE ORDINARY
NEGLIGENCE  (WHETHER  SOLE OR  CONTRIBUTORY)  OF SUCH  INDEMNIFIED  PERSON.  THE
OBLIGATIONS   OF  THE  BORROWER  UNDER  THIS  SECTION  9.14  SHALL  SURVIVE  THE
TERMINATION OF THIS AGREEMENT.

            Section  9.15.  Ratification  of Security  Documents.  The  Borrower
hereby ratifies, adopts and confirms the Liens granted by and under the Security
Documents  as  security  for  all  of  the  Obligations.  The  Borrower  further
acknowledges  and agrees that the term "Secured  Obligations"  as defined in the
Security  Agreement  shall  include,   without   limitation,   the  payment  and
performance of the Obligations as defined in this Agreement.

                       Section  9.16.  Confidentiality.  In the  event  that the
Borrower  provides to the Agent or the Banks  written  confidential  information
belonging to the Borrower,  if the Borrower shall denominate such information in
writing as  "confidential",  the Agent and the Banks shall  thereafter  maintain
such  information  in confidence  in  accordance  with the standards of care and
diligence that each utilizes in maintaining  its own  confidential  information.
This  obligation  of  confidence  shall  not  apply  to  such  portions  of  the
information  which (i) are in the public domain,  (ii) hereafter  become part of
the public domain without the Agent or the Banks breaching  their  obligation of
confidence to the Borrower, (iii) are previously known by the Agent or the Banks
from some source  other than the  Borrower,  (iv) are  hereafter  obtained by or
available to the Agent or the Banks from a third party who owes no obligation of
confidence to the Borrower with respect to such information or through any other
means other than through disclosure by the Borrower, (vi) are disclosed with the
Borrower's consent,  (vii) must be disclosed either pursuant to any Requirements
of Law or to Persons  regulating  the  activities of the Agent or the Banks,  or
(viii) as may be  required  by law or  regulation  or order of any  Governmental
Authority in any judicial, arbitration or governmental proceeding.  Further, the
Agent or a Bank may  disclose  any  such  information  to any  other  Bank,  any
independent petroleum engineers or consultants, any independent certified public

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accountants,  any legal counsel  employed by such Person in connection with this
Agreement  or  any  Security  Document,   including  without   limitation,   the
enforcement or exercise of all rights and remedies  thereunder,  or any assignee
or participant  (including prospective assignees and participants) in the Loans;
provided,  however,  that the Agent or Bank  imposes  on the Person to whom such
information is disclosed the same obligation to maintain the  confidentiality of
such  information as is imposed upon it hereunder.  Notwithstanding  anything to
the contrary  provided  herein,  this obligation of confidence shall cease three
(3) years from the date the  information  was  furnished,  unless  the  Borrower
requests in writing at least  thirty (30) days prior to the  expiration  of such
three year period,  to maintain the  confidentiality  of such information for an
additional  three year period.  The Borrower  waives any and all other rights it
may have to  confidentiality  as  against  the Agent and the  Banks  arising  by
contract,  agreement,  statute or law except as expressly stated in this Section
9.16.

                       Section  9.17.  Final  Agreement  of  the  Parties.  THIS
AGREEMENT AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE
PARTIES AND MAY NOT BE  CONTRADICTED  BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS  OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO ORAL AGREEMENTS BETWEEN
THE PARTIES.

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<PAGE>




            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by its officers thereunto duly authorized as of the date first above
written.

                                      ABRAXAS PETROLEUM
                                      CORPORATION


                                       By:
                                            Robert L. G. Watson
                                            Chief Executive Officer


                                       BANKERS TRUST COMPANY, as
                                       Agent and as Issuing Bank


                                       By:
                                            Mary Jo Jolly
                                            Assistant Vice President



                                      ING (U.S.) CAPITAL
                                      CORPORATION, as
                                         Co-Agent


                                       By:
                                            Christopher R. Wagner
                                            Vice President

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<PAGE>




                                       Bank:

Commitment: $15,000,000.00             BANKERS TRUST COMPANY



                                       By:

                                            Mary Jo Jolly
                                            Assistant Vice President

                                       Address:

                                       130 Liberty Street, 14th Floor
                                       New York, New York 10006

                                       Telecopy No.: (212) 250-6029

                                            Domestic Lending Office

                                       Bankers Trust Company
                                       130 Liberty Street, 14th Floor
                                       New York, New York 10006

                                       Eurodollar Lending Office

                                       Bankers Trust Company
                                       130 Liberty Street, 14th Floor
                                       New York, New York 10006


HOU04:43581.4


<PAGE>




                                       Bank:

Commitment: $15,000,000.00             ING (U.S.) CAPITAL
                                       CORPORATION


                                       By:
                                          Christopher R. Wagner
                                          Vice President

                                       Address:

                                       135 East 57th Street
                                       8th Floor
                                       New York, New York 10022

                                       Telecopy No.: (212) 832-3616
                                       Domestic Lending Office

                                       135 East 57th Street
                                       8th Floor
                                       New York, New York 10022

                                       Telecopy No.: (212) 832-3616

                                       Eurodollar Lending Office

                                       135 East 57th Street
                                       8th Floor
                                       New York, New York 10022

                                       Telecopy No.: (212) 832-3616

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<PAGE>



                                       Bank:

Commitment: $10,000,000.00             UNION BANK OF CALIFORNIA,
                                       N.A.



                                       By:
                                       Name:
                                       Title:


                                       By:
                                       Name:
                                       Title:

                                       Address:

                                       Union Bank of California, N.A.
                                       500 North Akard, Suite 4200
                                       Dallas, Texas 75201

                                       Telecopy No.: (214) 922-4209
                                       Domestic Lending Office

                                       Union Bank of California, N.A.
                                       445 South Figueroa Street
                                       Los Angeles, California 90071

                                       Eurodollar Lending Office

                                       Union Bank of California, N.A.
                                       445 South Figueroa Street
                                       Los Angeles, California 90071


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