BROWN TOM INC /DE
10-Q, 1996-08-14
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1


                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549
                                   FORM 10-Q


[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
 
FOR THE QUARTERLY PERIOD ENDED JUNE 30, 1996

                                       OR

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

COMMISSION FILE NUMBER 0-3880

                                 TOM BROWN, INC.                   
             ------------------------------------------------------
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
  <S>                                                   <C>
                     DELAWARE                               95-1949781    
         -------------------------------                ------------------
         (STATE OR OTHER JURISDICTION OF                (I.R.S. EMPLOYER
         INCORPORATION OR ORGANIZATION)                 IDENTIFICATION NO.)

               P. O. BOX 2608
           500 EMPIRE PLAZA BLDG.
               MIDLAND, TEXAS                                     79701  
  ---------------------------------------                      ----------
  (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                     (ZIP CODE)
</TABLE>

                                  915-682-9715                   
              ----------------------------------------------------
              (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)

                                 NOT APPLICABLE                  
              ----------------------------------------------------
              (FORMER NAME, FORMER ADDRESS AND FORMER FISCAL YEAR,
                         IF CHANGED SINCE LAST REPORT)


Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.   YES  /X/   NO  / /

                     APPLICABLE ONLY TO CORPORATE ISSUERS:

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of August 13, 1996.

       CLASS OF COMMON STOCK                   OUTSTANDING AT AUGUST 13, 1996
       ---------------------                   ------------------------------
          $.10 PAR VALUE                                 21,126,194
<PAGE>   2
                        TOM BROWN, INC. AND SUBSIDIARIES
                           QUARTERLY REPORT FORM 10-Q

                                     INDEX

<TABLE>
<CAPTION>
                                                                                                   Page No.
<S>           <C>                                                                                     <C>
Part I.       Financial Information (Unaudited):

              Consolidated Balance Sheets,
                June 30, 1996 and December 31, 1995                                                    4

              Consolidated Statements of Operations,
                Three Months and Six Months ended
                June 30, 1996 and 1995                                                                 6

              Consolidated Statements of Cash Flows,
                Six Months ended June 30, 1996 and 1995                                                7

              Notes to Consolidated Financial Statements                                               9

              Management's Discussion and Analysis of
                Financial Condition and Results of
                Operations                                                                            12

Part II.      Other Information:

              Item 4.  Submission of Matters to a Vote of
                       Security Holders                                                               16

              Item 6.  Exhibits and Reports on Form 8-K                                               17

              Signature                                                                               18
</TABLE>





                                       2
<PAGE>   3





                                TOM BROWN, INC.
                                 P. O. Box 2608
                             500 Empire Plaza Bldg.
                             Midland, Texas  79701

                             ______________________


                                QUARTERLY REPORT


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


                                   FORM 10-Q

                            _______________________


                              PART I OF TWO PARTS

                             FINANCIAL INFORMATION





                                       3
<PAGE>   4
                        TOM BROWN, INC. AND SUBSIDIARIES

                          Consolidated Balance Sheets

                      June 30, 1996 and December 31, 1995


<TABLE>
<CAPTION>
                                                                           June 30,              December 31,
         Assets                                                              1996                   1995
         ------                                                              ----                   ----
                                                                           (Unaudited)
<S>                                                                       <C>                   <C>
Current assets:
           Cash and cash equivalents                                      $  6,837,000           $  4,982,000
           Accounts receivable, net of allowance
             for doubtful accounts of $58,000 at
             June 30, 1996 and December 31, 1995                            11,989,000              7,408,000
           Accounts receivable -
             Wind River-Pavillion, Inc.                                         16,000                 62,000
           Inventories                                                         440,000                246,000
           Other                                                               236,000                190,000
                                                                           -----------            -----------
                  Total current assets                                      19,518,000             12,888,000
                                                                           -----------            -----------

Property and equipment, at cost:
           Oil and gas properties, based on the
             successful efforts accounting method                          222,881,000            186,624,000
           Other equipment                                                  23,368,000             12,056,000
                                                                           -----------            -----------
                                                                           246,249,000            198,680,000

           Less:  Accumulated depreciation
                    and depletion                                          120,235,000            112,695,000
                                                                           -----------            -----------
                  Net property and equipment                               126,014,000             85,985,000
                                                                           -----------            -----------

Senior gas indexed notes                                                    51,093,000             51,093,000
Deferred income taxes, net                                                   9,048,000             13,170,000
Other assets, net                                                            1,589,000              1,038,000
                                                                           -----------            -----------
                                                                         $ 207,262,000           $164,174,000
                                                                           ===========            ===========
</TABLE>



                                                                     (continued)


See accompanying notes to consolidated financial statements.





                                       4
<PAGE>   5
                        TOM BROWN, INC. AND SUBSIDIARIES

                          Consolidated Balance Sheets

                      June 30, 1996 and December 31, 1995


<TABLE>
<CAPTION>
                                                                           June 30,            December 31,
  Liabilities and Stockholders' Equity                                       1996                  1995
  ------------------------------------                                       ----                  ----
                                                                          (Unaudited)
<S>                                                                       <C>                   <C>
Current liabilities:
           Accounts payable                                               $ 11,364,000          $   5,979,000
           Accrued expenses                                                    952,000              1,536,000
                                                                           -----------            -----------
                  Total current liabilities                                 12,316,000              7,515,000
                                                                           -----------            -----------

Commitments and contingencies

Stockholders' equity:
           Common stock, at $.10 par value.
             Authorized 40,000,000 shares;
             Outstanding 21,124,694 and
             20,180,902 shares, respectively.                                2,112,000              2,018,000
           Convertible preferred stock,
             at $.10 par value.
             Authorized 2,500,000 shares;
             1,000,000 shares outstanding.                                     100,000                  -
           Additional paid-in capital                                      261,100,000            224,889,000
           Accumulated deficit                                             (68,366,000)           (70,248,000)
                                                                           -----------            ----------- 

                  Total stockholders' equity                               194,946,000            156,659,000
                                                                           -----------            -----------
                                                                         $ 207,262,000           $164,174,000
                                                                           ===========            ===========
</TABLE>



See accompanying notes to consolidated financial statements.





                                       5
<PAGE>   6
                        TOM BROWN, INC. AND SUBSIDIARIES

               Consolidated Statements of Operations (Unaudited)

               Three and Six Months ended June 30, 1996 and 1995

<TABLE>
<CAPTION>
                                                 Three Months ended                      Six Months ended  
                                                       June 30,                               June 30,     
                                                 ------------------                      ----------------  
                                                 1996          1995                      1996        1995  
                                                 ----          ----                      ----        ----  
<S>                                        <C>                <C>                   <C>               <C>
Revenues:
           Gas and oil sales               $ 8,324,000        $ 5,187,000           $16,757,000       $10,121,000
           Marketing, gathering
             and processing                  5,635,000          3,708,000            10,289,000         7,980,000
           Interest income and
             other                             112,000            267,000               230,000           489,000
                                            ----------         ----------            ----------        ----------
               Total revenues               14,071,000          9,162,000            27,276,000        18,590,000
                                            ----------         ----------            ----------        ----------
Costs and expenses:
           Gas and oil production            1,648,000          1,189,000             3,087,000         2,280,000
           Taxes on gas and oil
             production                        477,000            476,000             1,174,000         1,048,000
           Cost of gas sold                  3,835,000          3,129,000             7,486,000         6,858,000
           Exploration costs                   515,000            380,000               926,000         1,948,000
           Impairments of
             leasehold costs                     2,000            198,000                67,000           344,000
           General and
             administrative                  1,403,000          1,018,000             2,757,000         2,026,000
           Depreciation, depletion
             and amortization                3,980,000          2,386,000             7,697,000         4,706,000
           Writedown of properties               -                  -                     -             8,368,000
           Other                                10,000             27,000                17,000            27,000
                                            ----------         ----------            ----------         ---------
               Total costs
                 and expenses               11,870,000          8,803,000            23,211,000        27,605,000
                                            ----------         ----------            ----------        ----------

Income (loss) before
   income taxes                              2,201,000            359,000             4,065,000        (9,015,000)
Income tax provision:
           Recognition of
             deferred tax asset                  -                  -                     -            13,967,000
           Income tax expense                  752,000             86,000             1,386,000           149,000
                                            ----------          ---------            ----------        ----------

Net income                                 $ 1,449,000        $   273,000           $ 2,679,000       $ 4,803,000
                                            ----------         ----------            ----------        ----------

Preferred stock dividend                   $   437,000        $     -               $   797,000       $     -    
                                            ----------         ----------            ----------        ----------

Net income available to
  common shareholders                      $ 1,012,000        $   273,000           $ 1,882,000       $ 4,803,000
                                            ==========         ==========            ==========        ==========

Weighted average number of
  common shares outstanding                 21,121,775         15,536,860            21,117,484        16,195,448
                                            ==========         ==========            ==========        ==========

Net income per common share                $    .05           $    .02              $    .09          $    .30   
                                            ==========         ==========            ==========        ==========
</TABLE>

See accompanying notes to consolidated financial statements.





                                       6
<PAGE>   7
                        TOM BROWN, INC. AND SUBSIDIARIES

               Consolidated Statements of Cash Flows (Unaudited)

                    Six Months ended June 30, 1996 and 1995


<TABLE>
<CAPTION>
                                                                             Six Months ended
                                                                                  June 30,     
                                                                          -------------------------
                                                                          1996                 1995
                                                                          ----                 ----
<S>                                                                   <C>                  <C>
Cash flows from operating activities:
           Net income                                                 $  1,882,000         $  4,803,000
           Adjustments to reconcile net income
             to net cash provided by operating
             activities:
             Depreciation, depletion and amortization                    7,697,000            4,706,000
             Gain on sales of assets                                       (11,000)            (102,000)
             Option plan compensation                                       20,000               58,000
             Exploration costs                                             926,000            1,948,000
             Impairments of leasehold costs                                 67,000              344,000
             Writedown of properties                                         -                8,368,000
             Deferred income taxes                                       1,208,000          (13,967,000)
             Changes in operating assets and
               liabilities:
               Decrease (increase) in accounts
                 receivable                                             (4,535,000)             463,000
               Decrease (increase) in inventories                         (194,000)             596,000
               Increase in other current assets                            (46,000)             (35,000)
               Increase (decrease) in accounts
                 payable                                                 5,385,000             (727,000)
               Decrease in accrued expenses                               (584,000)            (366,000)
               Increase in other non-current assets                       (551,000)               -    
                                                                        ----------           ----------

Net cash provided by operating activities                             $ 11,264,000         $  6,089,000
                                                                        ----------           ----------
</TABLE>


                                                                     (continued)


See accompanying notes to consolidated financial statements.





                                       7
<PAGE>   8
                        TOM BROWN, INC. AND SUBSIDIARIES

               Consolidated Statements of Cash Flows (Unaudited)

                    Six Months ended June 30, 1996 and 1995


<TABLE>
<CAPTION>
                                                                             Six Months ended
                                                                                 June 30,    
                                                                          ------------------------
                                                                          1996                1995
                                                                          ----                ----
<S>                                                                   <C>                  <C>
Cash flows from investing activities:
           Proceeds from sales of assets                              $    109,000         $    460,000
           Capital and exploration expenditures                         (9,658,000)         (19,275,000)
           Investment in senior gas indexed notes                            -              (51,093,000)
                                                                        ----------           ---------- 

Net cash used in investing activities                                   (9,549,000)         (69,908,000)
                                                                        ----------           ---------- 

Cash flows from financing activities:
           Proceeds from issuance of long-term
             debt                                                            -               51,000,000
           Proceeds from exercise of stock options                         140,000               87,000
                                                                        ----------           ----------

Net cash provided by financing activities                                  140,000           51,087,000
                                                                        ----------           ----------

Net increase (decrease) in cash and cash
  equivalents                                                            1,855,000          (12,732,000)
                                                                        ----------           ---------- 

Cash and cash equivalents at beginning
  of period                                                              4,982,000           19,147,000
                                                                        ----------           ----------

Cash and cash equivalents at end of period                            $  6,837,000         $  6,415,000
                                                                        ==========           ==========

Cash paid during the period for:
           Interest                                                   $      -             $      -
           Taxes                                                            85,000               38,000
</TABLE>


See accompanying notes to consolidated financial statements.





                                       8
<PAGE>   9
                       TOM BROWN, INC. AND SUBSIDIARIES

                  Notes to Consolidated Financial Statements

                  Three and Six Months ended June 30, 1996 and 1995
                                 (Unaudited)


(1) During interim periods, Tom Brown, Inc. follows the accounting policies set
forth in its Annual Report to Stockholders and its Report on Form 10-K filed
with the Securities and Exchange Commission.  Users of financial information
produced for interim periods are encouraged to refer to the footnotes contained
in the Annual Report to Stockholders when reviewing interim financial results.

    In the opinion of management, the accompanying interim financial statements
contain all material adjustments, consisting only of normal recurring
adjustments necessary for a fair presentation.  Certain reclassifications have
been made to amounts reported in previous periods to conform to the 1996
presentation.

(2) Potential Purchase of Presidio Oil Company

     On May 31, 1995, the Company announced that it had written to Presidio Oil
Company ("Presidio") in order to propose a business combination between the two
companies. On June 28, 1995, the Company purchased approximately $56 million
principal amount of the outstanding $100 million principal amount of GINs of
Presidio for approximately $51 million, including accrued interest.  Presidio
has been unable to meet the interest payments on the GINs and is therefore in
default under terms of the GINs.  The purchase of the GINs was funded by a $51
million demand note that was repaid in November, 1995 using proceeds from a
common stock offering.

   On August 6, 1996, the Company announced that it had executed a definitive
agreement with Presidio for the acquisition of Presidio for $183 million
(consisting of approximately $101 million of cash and 5 million shares
(approximately 2.677 million shares after deducting the portion representing the
Company's previous investment in the Presidio Gas Indexed Notes) of the
Company's Common Stock valued at $16.50 per share), plus the assumption of
certain liabilities.  The transaction would be consummated through a Chapter 11
bankruptcy proceeding which was filed by Presidio on August 5, 1996. The
Company's obligation to consummate the transaction is conditioned upon, among
other things, the receipt of the bankruptcy court confirmation order approving
the transaction by November 15, 1996.

   Although management believes its investment in the GINs is a strategic part
of its efforts to acquire Presidio, there can be no assurances as to when, if
ever, such acquisition will be consummated.  A failure to consummate the
acquisition of Presidio could result in the Company not recovering its initial
investment in the GINs.  In addition, the value of the Company's investment in
the GINs may be adversely affected by the results of operations and financial
condition of Presidio, which is dependent in large part on the prices Presidio
realizes for its gas and oil production, as well as the ultimate outcome of
Presidio's efforts to restructure its outstanding indebtedness or to be acquired
by another party and the timing thereof.  There is not currently an active
trading market for the GINs, and the Company may experience difficulty in
selling the GINs if it desires to do so in the future.





                                       9
<PAGE>   10
                        TOM BROWN, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements


(3) Acquisition of KN Production Company ("KNPC")

    On January 31, 1996, the Company and KN Energy, Inc. ("KNE") closed joint
transactions which resulted in (i) the Company's acquisition of all of the
issued and outstanding stock of KNPC, formerly a wholly owned subsidiary of
KNE, and (ii) KNE's acquisition of 1,000,000 shares of the Company's $1.75
Convertible Preferred Stock, Series A (the "Series A Preferred Stock"), and
918,367 shares of the Company's Common Stock.  The Series A Preferred Stock
carries a 7% dividend payable quarterly.  In addition, Wildhorse Energy
Partners, LLC ("Wildhorse") was formed by the Company and KNE for the purpose
of providing gas gathering, processing, marketing, field and storage services.

    The transaction, accounted for as a purchase, was valued at $36.25 million,
of which $25 million was paid in the form of 1,000,000 shares of the Company's
Series A Preferred Stock and the remaining $11.25 million was paid in the form
of 918,367 shares of the Company's Common Stock, based on a price per share of
$12.25.  The addition of KNPC added approximately 34.5 Bcfe of proved gas
equivalent reserves, 243,000 net undeveloped acres and a natural gas storage
facility.

    Wildhorse was created to provide gathering, processing, marketing, storage
and field services to Rocky Mountain gas and oil producers and others.  
Wildhorse is jointly owned by the Company (45 percent) and KNE (55 percent) 
and is operated by KNE under the direction of an operating team with equal
representation from KNE and the Company.  The Company accounts for its share of
Wildhorse using the proportionate consolidation method of accounting.

    The Company has dedicated significant amounts of its Rocky Mountain gas 
production to Wildhorse for gathering, processing and marketing. KNE contributed
substantial gas marketing contracts and a natural gas pipeline in western
Colorado.

    The following table presents the unaudited pro forma revenues, net income
and net income per share for the six months ended June 30, 1996 and 1995,
assuming that the KNPC transaction occurred January 1, 1995.

<TABLE>
<CAPTION>
                                                Six Months ended
                                                     June 30,   
                                                ----------------
                                                1996        1995
                                                ----        ----
    <S>                                       <C>          <C>                      
    Revenues                                  $ 27,276     $ 24,472                 
                                                ======       ======                 

    Net income                                $  2,679     $  5,000                 
                                                                                    
    Preferred stock dividend                       875          875                 
                                                ------       ------                 
    Net income available to common                                                  
      shareholders                            $  1,804     $  4,125                 
                                                ======       ======                 
                                                                                    
    Net income per common share               $   .09      $   .25                  
                                                ======       ======                 
</TABLE>                                                   





                                       10
<PAGE>   11
                        TOM BROWN, INC. AND SUBSIDIARIES

                   Notes to Consolidated Financial Statements

(4) Income Taxes

    Financial Accounting Standard No. 109, "Accounting for Income Taxes" (the
"Statement") was adopted by the Company effective as of January 1, 1993.  The
Statement requires a balance sheet approach to the calculation of deferred
income taxes.  The Company has significant net operating loss carryforwards
and, therefore, calculated a net deferred tax asset upon adoption of the
Statement.  However, due to the Company's history of net operating losses until
1995, a valuation allowance was recorded equal to the amount of the net
deferred asset.

    Based on 1993 and 1994 additions to the Company's gas and oil reserves and
the resulting increases in anticipated future income, the Company expects to
realize a major portion of the future benefit of its net operating loss
carryforwards prior to their expiration.  Accordingly, that portion of the
valuation allowance was reversed in the first quarter of 1995.  A valuation
allowance of approximately $9.9 million  has been retained against the
Company's net deferred tax assets at June 30, 1996 based on management's
estimate of the recoverability of future tax benefits.

    Temporary differences and carryforwards which gave rise to significant
portions of deferred tax assets (liabilities) are as follows:

<TABLE>
<CAPTION>
                                                       June 30,       December 31,
                                                         1996             1995    
                                                     ------------    -------------
<S>                                                 <C>              <C>
Net operating loss carryforwards.................... $ 21,080,000    $ 23,070,000
Gas and oil acquisition, exploration and development
 costs deducted for tax purposes in excess of book..  (10,871,000)     (8,074,000)
Investment tax credit carryforwards.................    4,813,000       4,813,000
Option plan compensation............................    1,514,000       1,507,000
Other...............................................    2,435,000       2,435,000
                                                       ----------      ----------
  Net deferred tax asset............................   18,971,000      23,751,000
Valuation allowance.................................   (9,923,000)    (10,581,000)
                                                       ----------      ---------- 
  Recognized net deferred tax asset................. $  9,048,000    $ 13,170,000
                                                       ==========      ==========
</TABLE>

    The valuation allowance listed above relates primarily to net operating
loss and investment tax credit carryforwards. The Company evaluated all
appropriate factors to determine the proper valuation allowance for these
carryforwards, including any limitations concerning their use, the year the
carryforwards expire and the levels of taxable income necessary for
utilization. In this regard, full valuations were provided for investment tax
credit carryforwards. Based on its recent operating results and its expected
levels of future earnings, the Company believes it will, more likely than not,
generate sufficient taxable income to realize the benefit attributable to the
net operating loss carryforwards for which valuation allowances were not 
provided.





                                       11
<PAGE>   12
                        TOM BROWN, INC. AND SUBSIDIARIES

                    Management's Discussion and Analysis of
                 Financial Condition and Results of Operations


Results of Operations

    The factors which most significantly affect the Company's results of
operations are (1) the sales prices of natural gas and crude oil, (2) the level
of total sales volumes and (3) the level and success of exploration and
development activity.

    On January 31, 1996, the Company and KN Energy, Inc. ("KNE") closed joint
transactions which resulted in (i) the Company's acquisition of all of the
issued and outstanding stock of KNPC, formerly a wholly owned subsidiary of
KNE, and (ii) KNE's acquisition of 1,000,000 shares of the Company's $1.75
Convertible Preferred Stock, Series A (the "Series A Preferred Stock"), and
918,367 shares of the Company's Common Stock.  In addition, Wildhorse Energy
Partners, LLC ("Wildhorse") was formed by the Company and KNE for the purpose
of providing gas gathering, processing, marketing, field and storage services.

    The transaction, accounted for as a purchase, was valued at $36.25 million,
of which $25 million was paid in the form of 1,000,000 shares of the Company's
Series A Preferred Stock and the remaining $11.25 million was paid in the form
of 918,367 shares of the Company's Common Stock, based on a price per share of
$12.25.

Selected Operating Data
<TABLE>
<CAPTION>
                                            Three Months           Six Months   
                                               ended                 ended      
                                              June 30,              June 30,    
                                           --------------        ---------------
                                           1996      1995        1996       1995
                                           ----      ----        ----       ----
<S>                                     <C>       <C>         <C>        <C>
Revenues (in thousands):
   Natural gas sales.................    $ 5,753    $ 3,273     $11,906    $ 6,686
   Crude oil sales...................      2,571      1,914       4,851      3,435
   Marketing, gathering and                                              
     processing......................      5,635      3,708      10,289      7,980
   Other.............................        112        267         230        489
                                          ------      -----      ------     ------
         Total revenues..............    $14,071    $ 9,162    $ 27,276    $18,590
                                          ======      =====      ======     ======
                                                                         
Net income (in thousands)............    $ 1,012    $   273    $  1,882    $ 4,803
                                          ======      =====      ======     ======
                                                                         
Natural gas production (MMcf)........      4,347      2,781       8,221      5,330
Crude oil production (MBbls).........        123        106         258        200
Average natural gas sales                                                
   price ($/Mcf).....................    $  1.32    $  1.18    $   1.45    $  1.25
Average crude oil sales                                                  
   price ($/Bbl).....................    $ 20.90    $ 18.06    $  18.80    $ 17.18
</TABLE>                                                        

Revenues

  During the three month period ended June 30, 1996, revenues from natural gas
and oil production increased $3.1 million to $8.3 million compared to the same
period in 1995.  An increase in natural gas sales volumes of 56% increased
revenues by approximately $2.1 million.  An increase in average natural gas
prices received by the Company from $1.18 per Mcf to $1.32 per Mcf increased
revenues by approximately $0.4





                                       12
<PAGE>   13
                        TOM BROWN, INC. AND SUBSIDIARIES

                    Management's Discussion and Analysis of
                 Financial Condition and Results of Operations


million.  An increase in oil sales volumes of 16% increased revenues by
approximately $0.3 million for the three months ended June 30, 1996.  An
increase in the average crude oil sales prices from $18.06 to $20.90 per barrel
increased revenues $0.3 million.

  During the six month period ended June 30, 1996, revenues from natural gas
and oil production increased $6.6 million to $16.8 million compared to the same
period in 1995.  An increase in natural gas sales volumes of 54% increased
revenues by approximately $4.2 million.  An increase in average natural gas
prices received by the Company from  $1.25 per Mcf to $1.45 per Mcf increased
revenues by approximately $1.1 million.  An increase in oil sales volumes of
29% increased revenues by approximately $1.0 million for the six month period
ended June 30, 1996.  An increase in the average crude oil sales price from
$17.18 per Bbl to $18.80 per Bbl increased revenues by approximately $0.3
million for the six months ended June 30, 1996.

  Revenues from natural gas and oil production from the KNPC acquisition for
the first six months of 1996 accounted for $2.9 million of the $6.6 million
increase.

  Marketing, gathering and processing revenues increased $1.9 million and $2.3
million, respectively, for the three and six month periods ended June 30, 1996
as a result of the increased activity in the Company's natural gas marketing
operations through Wildhorse, its newly formed joint venture with KN Energy,
Inc.

Costs and Expenses

  Costs and expenses for the three months ended June 30, 1996 increased
approximately 35% to $11.9 million as compared to the same period in 1995 due
primarily to the properties acquired in the KNPC acquisition in January, 1996.
Natural gas and oil production expense increased $0.5 million as a result of
the addition of the KNPC properties.  An increase of $0.3 million in taxes on
gas and oil production due to the KNPC properties was offset by refunds of
severance taxes in the Company's Val Verde Basin.  Exploration costs increased
$0.1 million due to an exploratory dry hole in the second quarter of 1996.
General and administrative expenses increased $0.4 million due to additional
costs incurred with the addition of KNPC.  Depreciation, depletion and
amortization increased $1.6 million due to the addition of the KNPC properties
and additional Val Verde Basin wells.

  Costs and expenses for the six months ended June 30, 1996 decreased to $23.2
million from $27.6 million for the same period in 1995 due primarily to a
writedown of properties of $8.4 million resulting from the early adoption of
Statement of Financial Accounting Standards No. 121, "Accounting for the
Impairment of Long-lived Assets...", in the first quarter of 1995.  The
decrease was partially offset as a result of incremental operating costs
associated with KNPC in January, 1996.

  The Company incurred a current tax liability in the amount of $171,000 and
$149,000 for the six months ended June 30, 1996 and 1995, respectively, as a
result of the application of the alternative minimum tax rules as provided
under the Internal Revenue Code and state taxes.

  The Company recognized in the first quarter of 1995 a net deferred tax asset
in the amount of $13,967,000 and corresponding credit to deferred income tax
expense.  Deferred tax assets (related primarily to the Company's net operating
loss and investment tax credit carryforwards) were initially recorded in 1993,
but these tax assets had been reserved entirely by a valuation allowance up
until 1995.  Based on





                                       13
<PAGE>   14
                        TOM BROWN, INC. AND SUBSIDIARIES

                    Management's Discussion and Analysis of
                 Financial Condition and Results of Operations

recent additions to the Company's gas and oil reserves, the resulting increases
in anticipated future income and the absence of significant option plan
compensation charges to future income, the Company expects to realize a major
portion of the future benefit of its net operating loss carryforwards prior to
their expiration.  Accordingly, that portion of the valuation allowance was
reversed in the first quarter of 1995.  A valuation allowance of approximately
$10.0 million will be retained against the Company's deferred tax assets,
primarily because the Company's investment tax credit carryforwards are still
not expected to be realized in future periods.  The deferred tax assets and
related valuation allowance will be monitored for potential adjustments as
future events so indicate, although management does not expect such adjustments
to be significant in the near term.

Capital Resources and Liquidity

  The Company continues to operate under the strategy of maintaining a strong
balance sheet, adding value by increasing the Company's reserve base and
presence in significant natural gas areas and further developing the ability to
control and market the Company's production.

  In May 1995, the Company announced that it had written to Presidio Oil
Company ("Presidio") in order to propose a business combination between the two
companies. In June 1995, the Company announced that it had purchased $56
million principal amount of the $100 million principal amount outstanding of
the Senior Gas Indexed Notes ("GINs") of Presidio. The purchase closed on 
June 28, 1995 and was funded through a bank loan.

  In November 1995, the Company was notified by Presidio that the Company had
been selected as the party with which it would pursue negotiations for the
potential sale of substantially all of Presidio's assets. The Company's offer
for Presidio amounted to $180 million, subject to certain adjustments, of which
the cash portion would be an amount sufficient to repay the outstanding bank
debt and senior secured indebtedness. The remainder is to be paid in Common
Stock.

  On August 6, 1996, the Company announced that it had executed a definitive
agreement with Presidio for the acquisition of Presidio for $183 million
(consisting of approximately $101 million of cash and 5 million shares
(approximately 2.677 million shares after deducting the portion representing
the Company's previous investment in the Presidio GINs) of the
Company's Common Stock valued at $16.50 per share), plus the assumption of
certain liabilities. The transaction would be consummated through a Chapter 11
bankruptcy proceeding which was filed by Presidio on August 5, 1996. The
Company's obligation to consummate the transaction is conditioned upon, among
other things, the receipt of the bankruptcy court confirmation order approving
the transaction by November 15, 1996.

  The Company maintains a $65 million Credit Facility under a Credit Agreement
entered into in September 1995.  The Credit Facility matures in September 1998.
Borrowings under the Credit Facility are unsecured and bear interest, at the
election of the Company, at a rate equal to (i) the greater of the agent bank's
prime rate or the federal funds effective rate plus 0.50% or (ii) the agent
bank's eurodollar rate plus a margin ranging from 0.75% to 1.00%.  Interest on
amounts outstanding under the Credit Facility is due on the last day of each
month in the case of loans bearing interest at the prime rate or federal funds
rate and, in the case of loans bearing interest at the eurodollar rate,
interest payments are due on the last day of each applicable interest period of
one, two or three month periods, as selected by the Company at the time of
borrowing or, in the case of six month periods if selected by the Company,
interest payments are due on the last day of each three-month period.

  The Company has obtained a commitment letter from its lead bank to increase
the Credit Facility to $125 million.  If the Company is successful in its bid
for Presidio Oil Company, a major portion of the Credit Facility will be used
in that financing.

  In December 1995, the Company and KN Energy, Inc. ("KNE") jointly announced
the execution of a letter of intent providing for the merger of KNE's
wholly-owned gas and oil subsidiary, KNPC, into the Company and the formation of
a new gas services company, Wildhorse Energy Partners, LLC ("Wildhorse"). On
January 31, 1996, this transaction was completed with the Company issuing 1.0
million shares of Series A Preferred Stock and 0.9 million shares of Common
Stock.

  The addition of the KNPC reserves added approximately 34.5 Bcfe of proved gas
equivalent reserves.

  Wildhorse was created to provide gathering, processing, marketing, storage
and field services to Rocky Mountain gas and oil producers and others. It will
also pursue the construction or acquisition of gathering, processing and
storage areas of the Rocky Mountain region. Wildhorse is jointly owned by the
Company (45 percent) and KNE (55 percent) and is operated by KNE under
the direction of an operating team with equal representation from KNE and the
Company.

  The Company has dedicated significant amounts of its Rocky Mountain gas 
production to Wildhorse for gathering, processing and marketing. KNE 
contributed gas marketing contracts and storage assets in western Colorado.

  The level of capital expenditures by the Company will vary in future periods
depending on energy market conditions and other related economic factors. The
Company has no material long-term commitments and consequently, is able to 
adjust the level of its expenditures as circumstances warrant. Exclusive of
the purchase price paid by the Company for KNPC, the Company's capital
expenditures for the three and six month periods ended June 30, 1996 were
approximately $3.3 million and $7.9 million as compared to $7.9 million and
$14.9 million, respectively, in the same periods in 1995.

  The Company has historically funded capital expenditures and working capital
requirements with internally generated cash and borrowings.  During the six
months ended June 30, 1996, net cash provided by operating activities was
$11.3 million as compared to $6.1 million for the same period of 1995.

  The Company continues to pursue opportunities which will add value by
increasing its reserve base and presence in significant natural gas areas and
further developing the Company's ability to control and market production of
natural gas. The Common Stock offering in November 1995, the purchase of KNPC
and the elimination of all debt served to strengthen the Company's balance
sheet. As the Company continues to evaluate potential acquisitions and 
development its existing properties, it will benefit from its financing 
flexibility and the leverage potential of the Company's overall capital 
structure.





                                       14
<PAGE>   15





                                TOM BROWN, INC.
                                P. O. Box 2608
                             500 Empire Plaza Bldg.
                             Midland, Texas  79701



                           __________________________



                                QUARTERLY REPORT


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


                                   FORM 10-Q



                           __________________________



                              PART II OF TWO PARTS


                               OTHER INFORMATION





                                       15
<PAGE>   16
                        TOM BROWN, INC. AND SUBSIDIARIES

                               OTHER INFORMATION


Item 4.  Submission of Matters to a Vote of Security Holders

  The Company's annual meeting of stockholders was held on May 28, 1996.  At
the meeting, the following persons were elected to serve as Directors of the
Company until the 1997 annual meeting of stockholders and until their
respective successors are duly qualified and elected:  (1) Thomas C. Brown, (2)
Donald L. Evans, (3) William R. Granberry, (4) Henry Groppe, (5) Edward W.
LeBaron, Jr., (6) James B. Wallace, (7) Robert H. Whilden, Jr., (8) David M.
Carmichael and (9) George M. Simmons.

  Set forth below is a tabulation of votes with respect to each nominee for
Director:

<TABLE>
<CAPTION>                                                 
                             Votes             Votes            Broker
                            Cast For          Withheld         Non-votes
                            --------          --------         ---------
<S>                        <C>                 <C>             <C>
Thomas C. Brown            18,579,134          238,306            -0-
Donald L. Evans            18,597,289          220,151            -0-
William R. Granberry       18,579,289          238,151            -0-
Henry Groppe               18,699,114          118,326            -0-
Edward W. LeBaron, Jr.     18,717,139          100,301            -0-
James B. Wallace           18,699,137          118,303            -0-
Robert H. Whilden, Jr.     18,699,287          118,153            -0-
</TABLE>

  In addition to the above directors elected by the holders of the Common Stock,
the sole holder of the Company's 1,000,000 shares of outstanding Preferred 
Stock also designated David M. Carmichael and George M. Simmons as directors.

  An amendment to amend the Certificate of Incorporation of the Company to
increase the number of authorized shares of Common Stock to 40,000,000 was
adopted at the annual meeting of stockholders on May 28, 1996.

  Set forth below is a tabulation of votes with respect to this amendment:

<TABLE>
<CAPTION>
        Votes           Votes                               Broker
       Cast for      Cast Against      Abstentions         Non-votes
       --------      ------------      -----------         ---------
      <S>             <C>                <C>               <C>
      16,800,766      1,941,913          74,761               -0-
</TABLE>





                                       16
<PAGE>   17
                        TOM BROWN, INC. AND SUBSIDIARIES

                               OTHER INFORMATION


Item 6.   Exhibits and Reports on Form 8-K

 (a)       Exhibits         Description

           Exhibit No. 2    Exchange Agreement dated August 5, 1996 by and among
                            Presidio Oil Company, Presidio Exploration, Inc., 
                            Presidio West Virginia, Inc., Palisade Oil, Inc. 
                            and Tom Brown, Inc. (1)
           
           Exhibit No. 4    Certificate of Incorporation, as amended
 
           Exhibit No. 11   Computation of Per Share Earnings
                            
           Exhibit No. 27   Financial Data Schedule

 (b)       Reports on Form 8-K

           None.

- - ----------------
 (1)  Not included with Exhibit 2 are the following exhibits and schedules
      thereto, copies of which will be furnished supplementally to the 
      Commission on request:

         Exhibit A          Oil and Gas Leases
         Exhibit B          Oil and Gas Wells
         Exhibit D          Form of Disclosure Statement
         Exhibit E          Form of Affiliate Letter

         Schedule 4.19      Limitation on Acquisitions and Expenditures
         Schedule 4.22      Officers and Employees; Severance Plan and 
                            Agreements
         Schedule 4.26      Letters of Credit
         Schedule 5.5       Claims and Litigation
         Schedule 5.8       Tax Matters
         Schedule 5.9       Employee Benefit Plans
         Schedule 5.11      Capital Structure
         Schedule 5.12      Liabilities
         Schedule 5.13      Absence of Certain Changes
         Schedule 5.15      Labor Matters
         Schedule 5.16      Accounts Receivable
         Schedule 5.19      Accuracy of Oil and Gas Reserve Report
         Schedule 5.20      Oil and Gas Operations
         Schedule 5.21      Environmental Matters
         Schedule 5.22      No Brokers
         Schedule 5.23      Compliance With Laws
         Schedule 5.24      Material Insurance Policies
         Schedule 5.25      Oil and Gas Operating Agreements and 
                            Material Contracts
         Schedule 6.7       Capital Structure of Tom Brown, Inc.
         Schedule 6.8       Claims and Litigation       


                                       17
<PAGE>   18
                        TOM BROWN, INC. AND SUBSIDIARIES

                               OTHER INFORMATION


Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.




                                                 TOM BROWN, INC.
                                  ---------------------------------------------
                                                  (Registrant)




August 13, 1995                   /s/ Kim Harris
- - ---------------                   ---------------------------------------------
     Date                         Kim Harris
                                  Controller
                                  
                                  (Mr. Harris is the Chief Financial Officer   
                                  and is duly authorized to sign on behalf     
                                  of the Registrant)





                                       18
<PAGE>   19
                        TOM BROWN, INC. AND SUBSIDIARIES

                               OTHER INFORMATION

                               INDEX TO EXHIBITS

Exhibit No. 2     Exchange Agreement dated August 5, 1996 by and among
                  Presidio Oil Company, Presidio Exploration, Inc., 
                  Presidio West Virginia, Inc., Palisade Oil, Inc. 
                  and Tom Brown, Inc.

Exhibit No. 4     Certificate of Incorporation, as amended

Exhibit No. 11    Computation of Per Share Earnings
                            
Exhibit No. 27    Financial Data Schedule

<PAGE>   1


                     IN THE UNITED STATES BANKRUPTCY COURT

                          FOR THE DISTRICT OF DELAWARE

- - -----------------------------------------)
In re:                                   ) Chapter 11
                                         )
PRESIDIO OIL COMPANY,                    ) Case No. 96-______(__)
PRESIDIO EXPLORATION, INC.,              )    
PALISADE OIL, INC., and                  ) (Jointly Administered)
PRESIDIO WEST VIRGINIA, INC.,            )
                                         )
         Debtors and                     )
         Debtors-in-Possession.          )
- - ------------------------------------------



                          JOINT PLAN OF REORGANIZATION

         Presidio Oil Company, Presidio Exploration, Inc., Palisade Oil, Inc.,
and Presidio West Virginia, Inc.  (collectively, the "Debtors"), together with
Tom Brown, Inc. ("Tom Brown"), jointly propose, except with respect to Article
V ("Identification and Treatment of Classes Impaired Under the Plan"), which
Article V is proposed solely by the Debtors, the following plan of
reorganization (the "Plan") for each of the above-captioned Debtors pursuant to
the provisions of Chapter 11 of title 11, United States Code (the "Bankruptcy
Code").
                                   ARTICLE I

                                  DEFINITIONS

         Capitalized terms have the respective meanings specified below.  For
purposes of the Plan:  (a) whenever from the context it is appropriate, each
term, whether stated in the singular or the plural, will include both the
singular and the plural; (b) unless otherwise specified herein, any reference
to an entity as a holder of a Claim or Equity Interest (each as defined below)
includes that entity's predecessors, successors, assigns and affiliates; (c)
unless otherwise specified herein, all references in the Plan to sections,
articles, and appendices are references to sections, articles, and appendices
of or to the Plan; (d) the words "herein" and "hereto" refer to the Plan in its
entirety rather than to a particular portion of the Plan; (e) captions and
headings to articles and sections are inserted for convenience of reference
only and are not intended to be a part of or to affect the interpretation of
the Plan; and (f) the rules of construction of the Bankruptcy Code will apply.
<PAGE>   2
         1.01     ADMINISTRATIVE BAR DATE ORDER means the Order(s) of the
Bankruptcy Court establishing the last date by which requests for payment of
Administrative Expense Claims must be filed and which Order(s) shall provide
the mechanism for establishing the maximum entitlement to Fee Claims prior to
the Confirmation Date in accordance with Section 3.05 of the Plan.

         1.02     ADMINISTRATIVE EXPENSE CLAIM means a Claim for any cost or
expense of administration of the Chapter 11 Cases allowed under sections 503(b)
and 507(a)(1) of the Bankruptcy Code, including, without limitation, any actual
and necessary expenses of preserving the Debtors' respective Estates, any
actual and necessary expenses of operating the Debtors' businesses, Fee Claims,
and any fees or charges assessed against the respective Debtors under section
1930 of title 28, United States Code.

         1.03     AGGREGATE COMMON SHARE VALUE shall have the meaning set forth
in the Exchange Agreement.  

         1.4      AGENT BANK means The Chase Manhattan Bank (National
Association), or its successor, as agent for the Banks under the Bank Credit
Agreement.

         1.05     ALLOWED CLAIM, or the term ALLOWED used conjunctively with the
term Claim, or with respect to any class or subcategory of Claims, means a
Claim (or, if and to the extent permitted, a class of Claims), proof of which
was properly filed on or before the Claims Bar Date or, if no proof of claim
was filed, which has been or hereafter is listed by the respective Debtors on
their Schedules as liquidated in amount and not disputed or contingent, and, in
either case, as to which no objection to the allowance thereof has been
interposed on or before the Effective Date or such other applicable period of
limitation fixed by the Bankruptcy Code, the Bankruptcy Rules or the Bankruptcy
Court, or as to which any objection has been determined by a Final Order to the
extent such objection is determined in favor of the respective holder.  Unless
otherwise specified herein or by order of the Bankruptcy Court, an "Allowed
Claim" shall not for purposes of computation of distributions under the Plan
include interest on such Claim from the Petition Date.

         1.06     ALLOWED EQUITY INTEREST, or the term ALLOWED used
conjunctively with the term Equity Interest, or with respect to any class or
subcategory of Equity Interests, means an Equity Interest (or, if and to the
extent permitted, a class of Equity Interests) in Presidio, proof of which was
properly filed or, if no proof of interest was filed, which has been or
hereafter is listed by Presidio on its Schedules as liquidated in amount and
not disputed or contingent, and, in either case, as to which no objection to
the allowance thereof has been interposed on or before the Effective Date or
such other applicable period of limitation fixed by the Bankruptcy Code, the
Bankruptcy Rules or the Bankruptcy Court, or as to which any objection has been
determined by a Final Order to the extent such objection is determined in favor
of the respective holder.

         1.07     BANKS means the lenders who are parties to the Bank Credit
Agreement.





                                       2
<PAGE>   3
         1.08     BANK CLAIMS means the Claims of the Banks and the Agent Bank
against any of the Debtors pursuant to or arising under the Bank Credit
Agreement and any Subsidiary Guaranty thereon, including any Claim for
principal, unpaid interest and any related fees, charges or attorneys' fees
payable in accordance with the instruments evidencing and governing the Bank
Claims, and any liens and security interests granted to secure repayment of or
relating to the foregoing.

         1.09     BANK CREDIT AGREEMENT means the Amendment and Restatement of
Amendment, Restatement and Consolidation of Credit Agreement, dated August 6,
1993, as amended, between Presidio, Presidio Exploration, the Banks and each
other bank which is a signatory thereto or a successor or assign thereof and
the Agent Bank.

         1.10     BANKRUPTCY CODE means the Bankruptcy Code, Title 11, United
States Code, as amended.  

         1.11     BANKRUPTCY COURT means the United States Bankruptcy Court for
the District of Delaware, or such other court that exercises jurisdiction over
the Chapter 11 Cases. 

         1.12     BANKRUPTCY EVENT shall have the meaning set forth in the
Exchange Agreement.  

         1.13     BANKRUPTCY RULES means the Federal Rules of Bankruptcy 
Procedure, as amended, promulgated under 28 U.S.C. Section  2075, and the 
local rules of the Bankruptcy Court as applicable to the Chapter 11 Cases.  

         1.14     BUSINESS DAY means any day except Saturday, Sunday or any 
other day on which commercial banks in Wilmington, Delaware are required or 
authorized by law to be closed for business. 

         1.15     CASH means cash or cash equivalents in immediately available 
funds. 

         1.16     CASH CONSIDERATION shall have the meaning set forth in the 
Exchange Agreement. 

         1.17     CHAPTER 11 CASES means the cases filed by the respective 
Debtors under Chapter 11 of the Bankruptcy Code. 

         1.18     CLAIM or CLAIMS means, as to each Debtor: (i) any right to 
payment from the respective Debtors, whether or not such right is reduced 
to judgment, liquidated, unliquidated, fixed, contingent, matured, unmatured, 
disputed, undisputed, legal, equitable, secured or unsecured; or (ii)
any right to an equitable remedy for breach of performance if such breach gives
rise to a right of payment from the respective Debtors, whether or not such
right to an equitable remedy is reduced to judgment, fixed, contingent,
matured, unmatured, disputed, undisputed, secured or unsecured, and including,
without limitation, any Claim for attorneys' fees, other professional fees, or
court costs incurred in connection with collection thereof or in connection
with the Chapter 11 Cases.





                                       3
<PAGE>   4
         1.19    CLAIMS BAR DATE means the date the Bankruptcy Court sets as
the date by which all proofs of Claims must be filed.

         1.20    CLASS A COMMON STOCK, when used in connection with Presidio
Common Stock, means the Class A common stock, $.10 par value per share, issued
by Presidio.

         1.21    CLASS B COMMON STOCK, when used in connection with Presidio
Common Stock, means the Class B Common Stock, $.10 par value per share, issued
by Presidio.

         1.22    CLOSING shall have the meaning set forth in the Exchange
Agreement.

         1.23    CLOSING DATE shall have the meaning set forth in the Exchange
Agreement.

         1.24    CONFIRMATION DATE shall have the meaning set forth in the
Exchange Agreement. 

         1.25    CONFIRMATION HEARING means the hearing conducted by the 
Bankruptcy Court to consider confirmation of the Plan.

         1.26    CONFIRMATION ORDER shall have the meaning set forth in the
Exchange Agreement.  

         1.27    DGCL means the General Corporation Law of the State of 
Delaware, as amended from time to time.  

         1.28    DEBT OBLIGATIONS means the Senior Secured Note Claims, Senior
GIN Claims and Subordinated Debenture Claims, together with all Claims arising
directly or indirectly under the instruments governing same, and any guaranty
or Subsidiary Guaranty of any such Claims. 

         1.29    DEBTORS OR DEBTOR(S), means, individually or collectively as
the context requires, Presidio, Presidio Exploration, Palisade Oil, Presidio
West, or each of them. 

         1.30    DESIGNATED CONTRACTS shall have the meaning set forth in the
Exchange Agreement.  

         1.31    DESIGNATED CONTRACT ORDER means a Final Order of the Bankruptcy
Court (which may be the Confirmation Order) authorizing the assumption by the
applicable Debtor under Sections 365 or 1123(b)(2) of the Bankruptcy Code of
the Designated Contracts, which order shall provide that (i) the occurrence of
a Bankruptcy Event and (ii) the insolvency or financial condition of any Debtor
prior to the Effective Date shall not constitute a basis for the removal of any
Debtor as operator under any Designated Contract. 

         1.32    DISCLOSURE STATEMENT shall have the meaning set forth in the 
Exchange Agreement.  

         1.33    DISPUTED CLAIM means any Claim (i) listed on the Schedules 
as unliquidated, disputed or contingent or (ii) as to which the respective 
Debtor, Tom Brown or any other party in





                                       4
<PAGE>   5
interest has interposed a timely objection or request for estimation in
accordance with the Bankruptcy Code and the Bankruptcy Rules, which objection
or request for estimation has not been withdrawn or determined by Final Order.

         1.34    DISPUTED EQUITY INTEREST means any Equity Interest as to which
the respective Debtor, Tom Brown or any other party in interest has interposed
a timely objection or request for estimation in accordance with the Bankruptcy
Code and the Bankruptcy Rules, which objection or request for estimation has
not been withdrawn or determined by Final Order.

         1.35    DISTRIBUTEE means a holder of a Bank Claim, Debt Obligation or
Presidio Common Stock.  

         1.36    EFFECTIVE DATE means the Closing Date.

         1.37    EQUITY INTEREST means any equity interest in Presidio, which
shall include any common stock, preferred stock, and any security which is 
exercisable for or convertible into shares of common stock or preferred 
stock of Presidio.

         1.38    ESTATE means, as to each Debtor, the estate created for such
Debtor in its Chapter 11 Case pursuant to Section 541 of the Bankruptcy Code.

         1.39    EXCHANGE AGENT means either (i) such person or entity as may
be designated in and pursuant to the Exchange Agreement, or (ii) in the absence
of such designation, or if such person or entity as designated has ceased to be
the Exchange Agent and no other person or entity has been designated, a person
designated by Tom Brown and Presidio and approved by the Bankruptcy Court in
the Confirmation Order.

         1.40    EXCHANGE AGREEMENT means that Exchange Agreement dated August
5, 1996 by and among the Debtors and Tom Brown, and all Schedules and Exhibits
attached thereto, a copy of which is attached to the Plan as Exhibit "A", and
as such Exchange Agreement may be amended from time to time.

         1.41    EXCHANGE COMMON STOCK shall have the meaning set forth in the
Exchange Agreement; provided, however, that solely for the purposes of
computing the amount of Exchange Common Stock to be distributed to holders of
Allowed Class 5 Claims under section 5.03 of the Plan, the term Exchange Common
Stock shall mean the amount of shares that would exist, without regard to any
adjustments or reductions to the Aggregate Common Share Value and the amount of
Exchange Common Stock that may be made, (i) under the Exchange Agreement in
respect of the shares of Tom Brown Common Stock which otherwise would be
distributable to Tom Brown in respect of its Class 5 Claims and (ii) pursuant
to Section 5.09 of the Plan.

        1.42    EXCHANGE CONSIDERATION shall have the meaning set forth in the
Exchange Agreement.





                                       5
<PAGE>   6
        1.43    EXISTING PLANS shall have the meaning set forth in the Exchange
Agreement.  

        1.44    FEE CLAIM means a claim for compensation and reimbursement of
expenses pursuant to Sections 327, 328, 330, 331, 503(b) and 1103 of the
Bankruptcy Code for services rendered or expenses incurred prior to the
Effective Date.  

        1.45    FINAL ORDER shall have the meaning set forth in the Exchange
Agreement.  

        1.46    GENERAL UNSECURED CLAIM means (i) a Claim for goods, materials
or services provided to the respective Debtor or rendered to such Debtor in the
ordinary course of business prior to the commencement of its Chapter 11 Case,
(ii) damage Claims arising from the rejection, if any, of executory contracts
or unexpired leases pursuant to a Final Order of the Bankruptcy Court or the
Plan, (iii) Litigation Claims, and (iv) any Miscellaneous Unsecured Claims. 
Without limiting the foregoing, (x) in the case of damages for the rejection of
an unexpired lease, General Unsecured Claim shall mean the Allowed Claim as
determined by operation of subsections 502(b)(6) and 502(g) of the Bankruptcy
Code, and (y) in the case of any unsecured claim for reimbursement or
contribution of an entity which is liable with the respective Debtor or has
secured the claim of a creditor, General Unsecured Claim shall mean the Allowed
Claim as determined by operation of Section 502(e) of the Bankruptcy Code.
General Unsecured Claim shall not include any Administrative Expense Claim,
Priority Tax Claim, Priority Claim, Bank Claim, Senior Secured Note Claim,
Miscellaneous Secured Claim, Intercompany Claim, Senior GIN Claim, Subordinated
GIN Claim, Indemnity Claim, or Subordinated Debenture Claim.

        1.47    INTERCOMPANY CLAIM means any Claim by one or more of the
Debtors against any other of the Debtors, whether based upon an account (as
reflected in one or more intercompany book entries), or as otherwise recorded,
evidenced, or held.

        1.48    INDEMNITY CLAIM means any Claim relating to or arising from the
obligations of any Debtor to indemnify, hold harmless, or reimburse the past or
present directors, officers, and any former directors and officers of any of
the Debtors, whether or not such service terminated prior to the Petition Date
or extended beyond the Petition Date, against any obligation pursuant to,
related to, or arising under their respective articles of incorporation,
certificates of incorporation, or bylaws (whether in their form as of the
Petition Date or as amended on or before the Effective Date), by any other
contract of employment or other agreement, or pursuant to state laws or any
agreements, or any combination of the foregoing, and including, without
limitation, all such obligations as may arise or which may have arisen on,
before, or in connection with the Effective Date and the Closing.

        1.49    LITIGATION CLAIMS means the Claims against the Debtors listed
in Schedule 5.5 of the Exchange Agreement. 

        1.50    MISCELLANEOUS SECURED CLAIM means a Claim, to the extent of the
value, as determined by the Bankruptcy Court pursuant to subsection 506(a) of
the Bankruptcy Code, of any interest in property of the Estate securing such
Claim, including, without limitation, Claims secured





                                       6
<PAGE>   7
by mortgages or trust deeds of real property, mechanics' or materialmen's
liens, artisans' liens or security deposits, or by miscellaneous personal
property such as office furniture, telephone systems, copiers and mailing
equipment, including any Claim for principal, unpaid interest thereon, and any
related fees, charges or attorneys' fees (including those incurred before the
Petition Date in accordance with the instruments evidencing and governing such
obligations and those incurred from and after the Petition Date as may be
allowed pursuant to section 506(b) of the Bankruptcy Code), and any liens or
security interests granted to secure the foregoing.  Miscellaneous Secured
Claims shall not include any Bank Claim or Senior Secured Note Claim.

         1.51    MISCELLANEOUS UNSECURED CLAIMS means an unsecured claim not
entitled to priority under Section 507(a) of the Bankruptcy Code that is not an
Administrative Claim, Priority Tax Claim, Priority Claim, Bank Claim, Senior
Secured Note Claim, Miscellaneous Secured Claim, Senior GIN Claim, Subordinated
GIN Claim, Indemnity Claim, or Subordinated Debenture Claim and which is not
included in clauses (i), (ii), or (iii) of Section 1.46 in the definition of
General Unsecured Claims.  Without limiting the foregoing, in the case of an
unsecured claim for reimbursement or contribution of any entity which is liable
with the respective Debtor or has secured the claim of a creditor,
Miscellaneous Unsecured Claim shall mean the Allowed Claim as determined by
operation of Section 502(e) of the Bankruptcy Code.

         1.52    NEW D&O INSURANCE means the policies of directors and officers
liability insurance identified in the Exchange Agreement, including those
policies, endorsements, or riders to be obtained pursuant to the Exchange
Agreement.

         1.53    PALISADE OIL means Palisade Oil, Inc., a Colorado corporation,
a wholly-owned subsidiary of Presidio.  

         1.54    PETITION DATE or PETITION DATES means the respective dates on
which each Debtor, respectively, files or has filed its petition for relief
commencing its Chapter 11 Case; provided, however, that in the case of Presidio
West only, Petition Date means March 15, 1996.

         1.55    PLAN means this plan of reorganization, as it may be amended,
modified or supplemented from time to time in accordance herewith, the Exchange
Agreement, the Bankruptcy Code and the Bankruptcy Rules.

         1.56    PRESIDIO means Presidio Oil Company, a Delaware corporation,
at all times before, during and after the filing of the Chapter 11 Cases.

         1.57    PRESIDIO COMMON STOCK means all outstanding shares of Class A
Common Stock and all outstanding shares of Class B Common Stock in each case
determined as of the Record Date.

         1.58    PRESIDIO COMMON STOCK CASH CONSIDERATION shall have the
meaning set forth in the Exchange Agreement.





                                       7
<PAGE>   8
         1.59    PRESIDIO EXPLORATION means Presidio Exploration, Inc., a
Colorado corporation, a wholly-owned subsidiary of Presidio.

         1.60    PRESIDIO STOCK OPTIONS means any and all options or other
rights arising under any stock option plan of Presidio in effect as of the
Petition Date and which remain unexercised as of the Confirmation Date.

         1.61    PRESIDIO WARRANTS means any and all warrants or other rights
arising under any warrant agreement of Presidio in effect as of the Petition
Date and which remain unexercised as of the Confirmation Date.

         1.62    PRESIDIO WEST means Presidio West Virginia, Inc., a Delaware
corporation, a wholly-owned subsidiary of Presidio Exploration.

         1.63    PRIORITY CLAIM means a Claim for an amount entitled to
priority under subsection 507(a) of the Bankruptcy Code, other than an
Administrative Expense Claim or a Priority Tax Claim.

         1.64    PRIORITY TAX CLAIM means a Claim entitled to priority under
subsection 507(a)(8) of the Bankruptcy Code.

         1.65    PRO RATA SHARE means, with respect to any distribution of
property to a class under the Plan, proportionate sharing pursuant to which the
ratio of the amount of property distributed on account of an Allowed Claim or
Allowed Equity Interest in Presidio Common Stock to the amount of such Allowed
Claim or Allowed Equity Interest is the same as the ratio of the total amount
of property distributed to such class to the total amount of all Allowed Claims
or Allowed Equity Interests in such class.

         1.66    PROPOSED AMENDMENTS means the proposed amendments to the
articles or certificate of incorporation of each Debtor, which shall be
effective from and after the Effective Date, and which shall be substantially
in the form set forth in an Appendix to the Disclosure Statement or as
otherwise filed with the Bankruptcy Court prior to the Confirmation Hearing.

         1.67    RECORD DATE means, in accordance with Bankruptcy Rule 3018(a),
the date upon which the Bankruptcy Court's order approving the Disclosure
Statement is or has been entered, which date shall thereafter govern the
eligibility of any holder to vote either to accept or reject the Plan.

         1.68    REMAINING EXCHANGE COMMON STOCK means the number of shares of
Exchange Common Stock remaining after (i) deducting the amount of distributions
to be made to holders of Allowed Class 5 Claims pursuant to Section 5.03 of the
Plan and (ii) the reduction to the Aggregate Common Share Value and the amount
of Exchange Common Stock in the amount (A) which would





                                       8
<PAGE>   9
otherwise be distributable to Tom Brown in respect of its Class 5 Claims and
(B) that is made pursuant to clause (iii) of Section 5.09 of the Plan.

         1.69    REORGANIZED DEBTOR(S) means, individually or collectively, as
the context requires, the Debtors on and after the Effective Date.

         1.70    REORGANIZED PRESIDIO means Presidio on and after the Effective
Date.

         1.71    SCHEDULES means the schedules of assets and liabilities and
the statement of financial affairs filed by the respective Debtor as required
by Section 521 of the Bankruptcy Code and the Bankruptcy Rules.

         1.72    SENIOR GAS INDEXED NOTES means the $100,000,000 original
principal amount of Senior Gas Indexed Notes due 2002 issued under the Senior
GIN Indenture and any Claim arising thereunder or relating thereto.

         1.73    SENIOR GIN CLAIM means a Claim against any of the Debtors
arising under or relating to the Senior Gas Indexed Notes or the Senior GIN
Indenture, including, without limitation, (x) any Claim for principal, unpaid
interest thereon, and any related fees, charges or attorneys' fees incurred
before the Petition Date, and any liens granted to secure the foregoing and (y)
a Claim against any Debtor for any guaranty, including any applicable
Subsidiary Guaranty, of the Senior Gas Indexed Notes and any liens or security
interests granted to secure the foregoing or relating thereto.

         1.74    SENIOR GIN INDENTURE means the Indenture, dated as of August
6, 1993, among Presidio, various of its subsidiaries and U.S. Trust Company of
New York, as Indenture Trustee, relating to the Senior Gas Indexed Notes.

         1.75    SENIOR SECURED NOTES means the $75,000,000 original principal
amount of 11.5% Senior Secured Notes due 2000 issued under the Senior Secured
Note Indenture and any Claim arising thereunder or relating thereto.

         1.76    SENIOR SECURED NOTE CLAIM means a Claim against any of the
Debtors arising under or relating to the Senior Secured Notes or the Senior
Secured Note Indenture, including, without limitation, (x) any Claim for
principal, unpaid interest thereon, and any related fees, charges or attorneys'
fees, and any liens granted to secure the foregoing and (y) any Claim against a
Debtor for any guaranty, including any applicable Subsidiary Guaranty, of the
Senior Secured Notes and any liens or security interests granted to secure the
foregoing or relating thereto.

         1.77    SENIOR SECURED NOTE INDENTURE means the Indenture, dated as of
August 6, 1993, among Presidio, various of its subsidiaries and U.S. Trust
Company of New York, as Indenture Trustee, relating to the Senior Secured
Notes.





                                       9
<PAGE>   10
         1.78    SUBORDINATED DEBENTURES means the $50,000,000 original
principal amount of 9% Convertible Subordinated Debentures due 2015 issued
under the Subordinated Debenture Indenture and any Claim arising thereunder or
relating thereto.

         1.79    SUBORDINATED DEBENTURE CLAIM means a Claim against any of the
Debtors arising under or relating to the Subordinated Debentures or the
Subordinated Debenture Indenture, including (x) any Claim for principal, unpaid
interest thereon, and any related fees, charges or attorneys' fees, and any
liens granted to secure the foregoing and (y) a Claim against any Debtor for
any guaranty, including any applicable Subsidiary Guaranty, of the Subordinated
Debentures, including any liens or security interests granted to secure the
foregoing or relating thereto.

         1.80    SUBORDINATED DEBENTURE INDENTURE means the Indenture, dated as
of February 14, 1990, among Presidio and the Bank of Montreal Trust Company, as
Indenture Trustee, relating to the Subordinated Debentures.

         1.81    SUBORDINATED GAS INDEXED NOTES means the $100,000,000 original
principal amount of Senior Subordinated Gas Indexed Notes due 1999 issued under
the Subordinated GIN Indenture and any Claim arising thereunder or relating
thereto.

         1.82    SUBORDINATED GIN CONVENIENCE CLAIM means a Claim against any
of the Debtors arising under or relating to the Senior Subordinated Gas Indexed
Notes or the Subordinated GIN Indenture, including, without limitation, (x) any
Claim for principal, unpaid interest thereon, and any related fees, charges or
attorneys' fees, and any liens granted to secure the foregoing and (y) a Claim
against any Debtor for any guaranty, including any applicable Subsidiary
Guaranty, of the Subordinated Gas Indexed Notes and any liens or security
interests granted to secure the foregoing or relating thereto.

         1.83    SUBORDINATED GIN INDENTURE means the Indenture, dated as of
February 16, 1989, among Presidio, various of its subsidiaries and U.S. Trust
Company of New York, as Indenture Trustee, relating to the Subordinated Gas
Indexed Notes.

         1.84    SUBSIDIARY GUARANTY means any guaranty or other agreement
whereby any Debtor is, has become, or may be liable with, or has secured or may
secure a Claim against any other Debtor, including, without limitation, any
guaranty of collection, payment, or performance.

         1.85    TOM BROWN means Tom Brown, Inc., a Delaware corporation.

         1.86    TOM BROWN COMMON STOCK shall have the meaning set forth in the
Exchange Agreement.
                                            





                                       10
<PAGE>   11
                                   ARTICLE II

                        CLASSES OF CLAIMS AND INTERESTS

         2.01    The Plan constitutes a separate plan of reorganization for
each Debtor, and each class of Claims and Equity Interests identified below
constitutes a separate class for each Debtor unless otherwise indicated.  All
Claims and Equity Interests, except Administrative Expense Claims and Priority
Tax Claims, are placed in the following classes for each of the Debtors.  The
following are the respective classes of Claims against and Equity Interests in
the respective Debtors, without any substantive consolidation of the Debtors.
Joint references to classes of more than one Debtor herein are for convenience
and ease of reference only, and do not indicate the assumption of liabilities
of any of the Debtors by any of the other Debtors.

         (a)     Class 1 -- Priority Claims.
         (b)     Class 2 -- Bank Claims.
         (c)     Class 3 -- Senior Secured Note Claims.
         (d)     Class 4 -- Miscellaneous Secured Claims.
         (e)     Class 5 -- Senior GIN Claims.
         (f)     Class 6 -- General Unsecured Claims.
         (g)     Class 7 -- Subordinated GIN Convenience Claims.
         (h)     Class 8 -- Indemnity Claims.
         (i)     Class 9 -- Subordinated Debenture Claims.
         (j)     Class 10 -- Intercompany Claims.
         (k)     Class 11 -- Intercompany Equity Interests.
         (l)     Class 12 -- Presidio Common Stock.
         (m)     Class 13 -- Presidio Stock Options.
         (n)     Class 14 -- Presidio Warrants.





                                       11
<PAGE>   12
                                  ARTICLE III

                        TREATMENT OF UNCLASSIFIED CLAIMS

         3.01    UNCLASSIFIED CLAIMS.  In accordance with subsection 1123(a)(1)
of the Bankruptcy Code, Administrative Expense Claims and Priority Tax Claims
are not classified herein.

         3.02    ADMINISTRATIVE EXPENSE CLAIMS GENERALLY.  Subject to the
Administrative Bar Date and except as otherwise provided herein, unless
otherwise agreed by the holder of an Administrative Expense Claim and the
applicable Debtor, each holder of an Allowed Administrative Expense Claim will
receive, in full satisfaction of its Claim, Cash equal to the amount of such
Administrative Expense Claim on the later of fifteen (15) Days after the
Effective Date or the date such Claim is due and payable by its terms or, if
such Administrative Expense Claim does not become an Allowed Claim as of the
Effective Date, thirty (30) Business Days after the date the order allowing
such Claim becomes a Final Order.

         3.03    STATUTORY FEES.  On or before the Effective Date, all fees
payable pursuant to section 1930 of title 28, United States Code, will be paid
in Cash.

         3.04    ADMINISTRATIVE EXPENSE CLAIMS FOR GOODS, MATERIALS AND
SERVICES INCURRED IN THE ORDINARY COURSE OF BUSINESS.  Administrative Expense
Claims based on liabilities incurred by one or more of the Debtors for goods,
materials, and services delivered, obtained, or received in the ordinary course
of business (which includes, without limitation, such expenses as they relate
to the ordinary course of drilling, operation or maintenance of any oil or gas
well, property or prospect and in carrying out such Debtor's general and
administrative operations) will be assumed and paid by the applicable Debtor
pursuant to the terms and conditions of the particular transaction giving rise
to such Administrative Expense Claims, and, unless the Bankruptcy Court orders
otherwise, holders of Administrative Expense Claims based on liabilities
incurred by one or more of the Debtors for goods, materials, and services
delivered, obtained, or received in the ordinary course of business (which
includes, without limitation, such expenses as they relate to the ordinary
course of drilling, operation or maintenance of any oil or gas well, property
or prospect and in carrying out such Debtor's general and administrative
operations) will not be required to file or serve a request for payment of such
Claim, and will not be subject to the Administrative Bar Date referenced in
Section 3.05(a) of the Plan.

         3.05    BAR DATES FOR ADMINISTRATIVE EXPENSE CLAIMS.

         (a)     GENERAL BAR DATE PROVISIONS.  Holders of Administrative
Expense Claims that are required to file and serve a request for payment of
such Claims and that do not file and serve a request by the applicable
Administrative Bar Date will be forever barred from asserting such Claims
against the Debtors, as reorganized, or their respective property; and





                                       12
<PAGE>   13
         (b)     PROCEDURES AND LIMITATIONS APPLICABLE TO FEE CLAIMS.  (i)  At
least ten days prior to the actual commencement of the Confirmation Hearing,
entities intending to assert and request payment of Fee Claims shall file with
the Bankruptcy Court a written estimate of the maximum amount of compensation
and reimbursement of expenses to be requested for the period through the
Effective Date.  Unless the Bankruptcy Court orders otherwise, and subject to
subsection (iii) below, such estimates shall thereafter establish the maximum
amounts which may thereafter be Allowed with respect to such entity, and any
Fee Claims for which such a written maximum estimate is not timely filed shall
be forever barred.  (ii) Subject to the immediately foregoing subsection (i),
entities asserting and requesting payment of Fee Claims must file and serve on
Presidio, Tom Brown, and their respective counsel, and on such other entities
who are designated by the Bankruptcy Rules, the Confirmation Order, or by other
order of the Bankruptcy Court a fee application within the later of fifteen
(15) Business Days after the Effective Date and twenty (20) Business Days after
the entry of the Confirmation Order or such other date as the Bankruptcy Court
may fix after motion and a hearing, and any and all objections to any such fee
applications shall be filed within ten (10) Business Days after such filing
deadline.  The Bankruptcy Court shall retain jurisdiction to determine all such
fee applications and Fee Claims.  (iii) In any event, unless the Debtors and
Tom Brown agree otherwise, the maximum amount of Allowed Fee Claims shall be
determined prior to Closing.

         3.06    PAYMENT OF PRIORITY TAX CLAIM.  (a)  Pursuant to subsection
1129(a)(9)(C) of the Bankruptcy Code, unless otherwise agreed by the holder of
a Priority Tax Claim and the applicable Debtor or Reorganized Debtor, each
holder of a Priority Tax Claim will receive, in full satisfaction of its
Allowed Priority Tax Claim, deferred Cash payments over a period not exceeding
six years from the date of assessment of such Allowed Priority Tax Claim.
Payments will be made in equal annual installments of principal, plus simple
interest accruing from the Effective Date at seven percent (7%) per annum on
the unpaid portion of each Allowed Priority Tax Claim (or upon such other terms
determined by the Bankruptcy Court to provide the holders of Allowed Priority
Tax Claims with deferred cash payments having a value, as of the Effective
Date, equal to such Claim).  Unless otherwise agreed by the holder of such
Claim and the applicable Debtor or Reorganized Debtor, the first payment will
be payable one year after the Effective Date or, if the Allowed Priority Tax
Claim is not Allowed within one year after the Effective Date, a date which is
not later than thirty (30) days after the date on which an order allowing such
Claim becomes a Final Order;

         (b)     Notwithstanding anything to the contrary in Section 3.06(a) of
the Plan, the Reorganized Debtors may pay any Allowed Priority Tax Claim, or
any remaining balance of such Claim, in full, at any time on or after the
Effective Date, without premium or penalty.





                                       13
<PAGE>   14
                                   ARTICLE IV

                        IDENTIFICATION AND TREATMENT OF
                        CLASSES NOT IMPAIRED UNDER PLAN

         The following treatment shall be provided for the enumerated classes
of the respective Debtors, without any substantive consolidation of the
Debtors.  Joint references to classes of more than one Debtor herein are for
convenience and ease of reference only, and do not indicate the assumption of
liabilities of any of the Debtors by any other Debtor.  The treatment and the
consideration received by holders of allowed Claims or Equity Interests
pursuant to this Article IV shall be in full satisfaction, release and
discharge of such holders' Claims against each of the Debtors and any other
Claims, obligations, rights, causes of action and liabilities which such holder
may be entitled to assert against any of the Debtors, whether known or unknown,
foreseen or unforeseen, then existing or thereafter arising or based in whole
or in part upon any act, omission or other occurrence taking place on or prior
to the Effective Date.

         4.01    CLASS 1 - PRIORITY CLAIMS.  Unless otherwise agreed, each
Priority Claim that becomes an Allowed Claim against any of the Debtors shall,
at the applicable Reorganized Debtor's sole option, either (a) be paid the
Allowed amount of such Priority Claim in full, in Cash, by the Debtor or
Debtors obligated on such Claim on or promptly after the later of the Effective
Date and the date such Claim becomes an Allowed Claim; or (b) be paid or
performed in accordance with the terms and conditions of each agreement
relating thereto in the ordinary course of such Reorganized Debtor's business.

         4.02    CLASS 4 - MISCELLANEOUS SECURED CLAIMS.  Unless otherwise
agreed, each holder of an Allowed Miscellaneous Secured Claim shall be treated,
at the sole option of the respective Reorganized Debtor obligated thereon,
notwithstanding any contractual provision or applicable law that entitles the
holder of such Claim to demand or receive accelerated payment of such Claim
after the occurrence of a default, in one of the following three ways: (i) the
applicable Debtor will, on or promptly after the Effective Date, (A) cure any
such default that occurred before or after the Petition Date, other than a
default of a kind specified in subsection 365(b)(2) of the Bankruptcy Code, (B)
reinstate the maturity of such Claim as such maturity existed before such
default, (C) compensate the holder of such Claim for any damages incurred as a
result of any reasonable reliance by such holder on such contractual provision
or such applicable law and (D) execute a written undertaking in favor of such
holder, whereby the respective Debtor assumes such Claim and, except as
permitted in clauses (A), (B) and (C) hereof, does not otherwise alter the
legal, equitable or contractual rights of such holder with respect to such
Claim; (ii) the respective Reorganized Debtor will, on or promptly after the
Effective Date, pay Cash equal to such holder's Allowed Claim; or (iii) the
respective Debtor will, on or promptly after the Effective Date, distribute to
the holder of the Claim the property securing such Claim.





                                       14
<PAGE>   15
         4.03    CLASS 6 - GENERAL UNSECURED CLAIMS.  Each General Unsecured
Claim that becomes an Allowed Claim shall be assumed by, and become a liability
of, the Reorganized Debtor obligated on such Allowed Claim and shall (a) be
paid in full by the Debtor or Debtors obligated on such Claim on or promptly
after the later of the Effective Date and, if such Claim is a Disputed Claim,
the date such Claim becomes an Allowed Claim or, (b) if such Claim is not due
and payable by the Effective Date, be paid or performed in accordance with the
terms and conditions of each agreement relating thereto in the ordinary course
of such Reorganized Debtor's business; provided, that no payment shall be made
on a date later than that required in the Exchange Agreement.

         4.04    CLASS 7 - SUBORDINATED GIN CONVENIENCE CLAIMS.  Allowed
Subordinated GIN Convenience Claims will, on or promptly after the Effective
Date, be paid in full in Cash so that such Claims are deemed redeemed in
accordance with the terms of the Subordinated GIN Indenture.  On the Effective
Date, the Subordinated Gas Indexed Notes and any Subsidiary Guaranty thereon
shall be canceled, and the Debtors shall each be relieved of any further
obligations thereunder.

         4.05    CLASS 10 - INTERCOMPANY CLAIMS.  Intercompany Claims are not
impaired.

         4.06    CLASS 11 - INTERCOMPANY EQUITY INTERESTS.  Intercompany Equity
Interests are not impaired.

                                  ARTICLE V

                       IDENTIFICATION AND TREATMENT OF
                         CLASSES IMPAIRED UNDER PLAN

         Article V is proposed solely by the Debtors and not by Tom Brown.  The
following treatment shall be provided for the enumerated Classes of the
respective Debtors, without any substantive consolidation of the other Debtors.
Joint references to more than one Debtor herein are for convenience and ease of
reference only, and do not indicate the assumption of liabilities of any of the
Debtors by any other Debtor.  The treatment and the consideration received by
the holders of Allowed Claims or Equity Interests pursuant to this Article V
shall be in full satisfaction, release and discharge of such holders' Claims
against each and all of the Debtors, any other Claims, obligations, rights,
causes of action, liabilities, or interests (including Equity Interests) which
such holder may be entitled to assert against or with respect to any of the
Debtors, whether known or unknown, foreseen or unforeseen, then existing or
thereafter arising, whether based in whole or in part upon any act, omission or
other occurrence taking place or accruing on or prior to the Effective Date.

         5.01    CLASS 2 - BANK CLAIMS.  In full satisfaction, discharge and
release of the Bank Claims, the Agent Bank, on behalf of the Banks, shall
receive from the Exchange Agent on or promptly after the Effective Date, Cash
equal to the Allowed Bank Claim; provided, however, that any letters of credit
issued under or in connection with the Bank Claims shall be substituted in
accordance with Section 4.26 of the Exchange Agreement; and, further provided,
however, that the Allowed Bank Claim shall include post-petition interest
computed at the contractual non-default rate





                                       15
<PAGE>   16
contained in the Bank Credit Agreement but in any event shall not include (x)
interest on any outstanding letters of credit which have not been drawn upon by
the beneficiaries thereof and (y) post-petition interest computed in excess of
the contractual non-default rate contained in the Bank Credit Agreement.  On
the Effective Date, but in any event contemporaneously with and not before the
payments to the Agent Bank contemplated in this Section, the Bank Claims, all
Subsidiary Guaranties thereon and all liens and security interests which secure
repayment of the Bank Claims or the Subsidiary Guarantees shall be transferred
absolutely and unconditionally to Tom Brown in accordance with the Exchange
Agreement and Section 8.05 of the Plan.  Subject to the limitations of Section
5.09(b)(iii) of the Plan, the Agent Bank, on behalf of the Banks, may also
receive on or promptly after the Effective Date the additional increment of
Exchange Consideration specified therein, but distribution of this additional
consideration need not be contemporaneous with and may occur after the transfer
of liens, security interests and Subsidiary Guarantees to Tom Brown.

         5.02    CLASS 3 - SENIOR SECURED NOTE CLAIMS.  In full satisfaction,
discharge and release of all Claims against each of the Debtors, each holder of
Allowed Claims in Class 3 shall receive from the Exchange Agent on or promptly
after the Effective Date, the sum of $1,050.40 for each $1,000 principal amount
of Senior Secured Notes.  On the Effective Date, the Senior Secured Notes, all
Subsidiary Guaranties thereon and all liens and security interests arising
thereunder which secure repayment of the Senior Secured Claims shall be
transferred absolutely and unconditionally to Tom Brown in accordance with the
Exchange Agreement and Section 8.05 of the Plan.  Subject to the limitations of
Section 5.09(b) of the Plan, Class 3 may also receive on or promptly after the
Effective Date the additional increment of Exchange Consideration specified
therein.

         5.03    CLASS 5 - SENIOR GIN CLAIMS.  In full satisfaction, discharge
and release of all Claims against each of the Debtors, each holder of an
Allowed Senior GIN Claim shall receive from the Exchange Agent on or promptly
after the Effective Date (i) in the event that Class 5 accepts the Plan, its
Pro Rata Share of 83% of the Exchange Common Stock, or (ii) in the event that
Class 5 rejects the Plan, its Pro Rata Share of 78.85% of the Exchange Common
Stock.  No distributions of Exchange Common Stock will be made to Tom Brown on
account of its Class 5 Claims, and, after making the above calculation of the
allocation of Exchange Common Stock contemplated by this Section 5.03, the
amount of Exchange Common Stock and Aggregate Common Share Value will be
reduced by such amounts otherwise allocable or distributable to Tom Brown's
Class 5 Claims.  On the Effective Date, the Senior Gas Indexed Notes and all
Subsidiary Guaranties thereon shall be transferred absolutely and
unconditionally to Tom Brown in accordance with the Exchange Agreement and
Section 8.05 of the Plan.  Subject to the limitations of Section 5.09(b)(i)
and (ii) of the Plan, Class 5 may also receive on or promptly after the
Effective Date the additional increment of Exchange Consideration specified
therein.

         5.04    CLASS 8 - INDEMNITY CLAIMS.  Indemnity Claims shall receive no
distributions under the Plan and shall be discharged against each of the
Debtors, except that, pursuant to Section 4.15 of the Exchange Agreement, Tom
Brown shall use its reasonable efforts to obtain and maintain or cause the
Reorganized Debtors to obtain and maintain in effect the New D&O Insurance.





                                       16
<PAGE>   17
         5.05    CLASS 9 - SUBORDINATED DEBENTURE CLAIMS.  In full
satisfaction, discharge and release of all Claims against each of the Debtors,
each holder of an Allowed Subordinated Debenture Claim shall receive (i) in the
event that Classes 5 and 9 accept the Plan, from the Exchange Agent, on or
promptly after the Effective Date, its Pro Rata Share of 83.25% of the
Remaining Exchange Common Stock or (ii) in the event that either of Classes 5
or 9 rejects the Plan, no distributions. On the Effective Date, all outstanding
Subordinated Debentures and Subsidiary Guaranties thereof shall be transferred
absolutely and unconditionally to Tom Brown in accordance with the Exchange
Agreement and Section 8.05 of the Plan.  Subject to the limitations of Section
5.09(b)(i) of the Plan, Class 9 may also receive on or promptly after the
Effective Date the additional increment of Exchange Consideration specified
therein.

         5.06    CLASS 12 - PRESIDIO COMMON STOCK.  In full satisfaction,
discharge, release of all Presidio Common Stock, each holder of an Allowed
Equity Interest in Presidio Common Stock shall receive (i) in the event that
each of Classes 5, 9 and 12 accepts the Plan, from the Exchange Agent, on or
promptly after the Effective Date, its Pro Rata Share of (x) 16.75% of the
Remaining Exchange Common Stock and (y) the Presidio Common Stock Cash
Consideration or (ii) if any of Classes 5, 9 or 12 rejects the Plan, no
distributions.  On the Effective Date, all certificates evidencing Presidio
Common Stock shall be transferred absolutely and unconditionally to Tom Brown
in accordance with the Exchange Agreement and Section 8.05 of the Plan.

         5.07    CLASS 13 -- PRESIDIO STOCK OPTIONS.  Holders of Presidio Stock
Options shall receive and retain nothing under the Plan, and are deemed to
reject the Plan.  From and after entry of the Confirmation Order, holders of
Presidio Stock Options may not exercise such Presidio Stock Options in any
manner, and all instruments evidencing such Presidio Stock Options shall, upon
the Effective Date, be canceled and thereafter deemed null and void.

         5.08    CLASS 14 -- PRESIDIO WARRANTS.  Holders of Presidio Warrants
shall receive and retain nothing under the Plan, and are deemed to reject the
Plan.  From and after entry of the Confirmation Order, holders of Presidio
Warrants may not exercise such Presidio Warrants in any manner, and all
instruments evidencing such Presidio Warrants shall, upon the Effective Date,
be canceled and thereafter deemed null and void.

         5.09    REALLOCATION OF AND REDUCTION IN AGGREGATE COMMON SHARE VALUE
AND NUMBER OF SHARES OF EXCHANGE COMMON STOCK ISSUED.  (a) If: (i) any of
Class 5, Class 9, or Class 12 rejects the Plan, then Class 12 shall receive no
distributions under the Plan; (ii) either Class 5 or Class 9 rejects the Plan,
then Class 9 shall receive no distributions under the Plan; and, (iii) Class 5
rejects the Plan, then Class 5 shall receive the distribution provided for in
Clause (ii) of Section 5.03 of the Plan.

         (b)  If (i) Class 12 rejects the Plan but the Plan is accepted by
Classes 5 and 9, then the Exchange Consideration that otherwise would have been
distributed to Class 12 had it accepted the Plan shall be reallocated to
Classes 3, 5, and 9 ratably, according to the ratio of the Exchange
Consideration which would otherwise have been distributed to each of Classes 3,
5 and 9 compared





                                       17
<PAGE>   18
to the total amount of the Exchange Consideration which would otherwise have
been distributed to Classes 3, 5, and 9, and distributed Pro Rata as additional
Exchange Consideration within each of Classes 3, 5, and 9; (ii) Class 9 rejects
the Plan but the Plan is accepted by Class 5 (and without regard to whether
Class 12 votes to accept or reject the Plan), then the Exchange Consideration
that otherwise would have been distributed to Classes 9 and 12 had each such
Class accepted the Plan shall be reallocated to Classes 3 and 5 ratably,
according to the ratio of the Exchange Consideration which would otherwise have
been distributed to each of Classes 3 and 5 compared to the total amount of the
Exchange Consideration which would otherwise have been distributed to Classes 3
and 5, and distributed Pro Rata as additional Exchange Consideration within
each of Classes 3 and 5; and (iii) Class 5 rejects the Plan (and without regard
to whether Classes 9 or 12 vote to accept or reject the Plan), then the
Exchange Consideration that otherwise would have been distributable to Classes
5 (as if Clause (i) of Section 5.03 of the Plan were applicable and less the
Exchange Consideration actually distributable to Class 5 by operation of Clause
(ii) of Section 5.03 of the Plan), 9, and 12 had each such Class accepted the
Plan shall be reallocated to and distributed as additional Exchange
Consideration in the following order of priority:

         FIRST, Pro Rata within Class 3 unless and until each Allowed Claim in
         Class 3 is paid in full with interest in accordance with the terms of
         the Senior Secured Notes without reference to any limitation on
         payment otherwise applicable pursuant to Section 5.02 of the Plan;

         SECOND, Pro Rata within Class 2 until each Allowed Claim in Class 2 is
         paid in full with interest in accordance with the terms of the Bank
         Credit Agreement and without reference to any limitation on payment
         otherwise applicable pursuant to Section 5.01 of the Plan; and

         THIRD, Pro Rata within Class 5 until each Allowed Claim in Class 5 is
         paid in full with interest in accordance with the terms of the Senior
         Gas Indexed Notes without reference to any limitation on payment
         otherwise applicable pursuant to Section 5.03 of the Plan.

                                   ARTICLE VI

                        ACCEPTANCE OR REJECTION OF PLAN

         6.01    VOTING CLASSES.  Each holder of an Allowed Claim in Classes 2,
3, 5, 8 and 9 or an Allowed Equity Interest in Class 12, respectively, shall be
entitled to vote to accept or reject the Plan as to all Debtors.

         6.02    DEEMED ACCEPTANCE OF PLAN.  Classes 1, 4, 6, 7, 10 and 11
respectively, are unimpaired under the Plan and, therefore are also
conclusively presumed to accept the Plan as to all Debtors.

         6.03    DEEMED REJECTION OF PLAN.  Classes 13 and 14 shall receive and
retain nothing under the Plan and, accordingly, are deemed to reject the Plan.
Confirmation of the Plan as to such Classes shall be pursuant to subsection
1129(b)(2)(C)(ii) of the Bankruptcy Code.  In the event that Classes





                                       18
<PAGE>   19
9 or 12 receive and retain no distributions by virtue of a rejection of the
Plan by Classes 5, 9, or 12, then Classes 9 or 12, respectively, will also be
deemed to reject the Plan.  
        
         6.04    NONCONSENSUAL CONFIRMATION.  The Debtors and Tom Brown reserve
the right to request that the Bankruptcy Court confirm the Plan in accordance
with subsection 1129(b) of the Bankruptcy Code as to any impaired Class
notwithstanding the actual or deemed rejection by such impaired classes, in
addition to Classes 13 and 14.  In the event that Classes 9 or 12 receive and
retain no distributions by virtue of a rejection of the Plan by Classes 5, 9,
or 12, or if Class 5 receives a reduced distribution by virtue of a rejection
of the Plan by Class 5, the Debtors and Tom Brown also reserve the right to
request confirmation of the Plan in accordance with subsection 1129(b) of the
Bankruptcy Code as to Classes, 5, 9, or 12, respectively, and as appropriate.

         6.05    ONE VOTE PER HOLDER.  If a holder of a Claim holds more than
one Claim in any one class, all Claims of such holder in such class shall be
aggregated and deemed to be one Claim for purposes of determining the number of
Claims and claimants voting for or against the Plan.

                                  ARTICLE VII

         PROCEDURES FOR DISTRIBUTIONS AND TREATMENT OF DISPUTED CLAIMS

         7.01    EXCHANGE CONSIDERATION AND THE EXCHANGE FUND.  (a) PAYMENT ON
CLOSING.  At the Closing, Tom Brown shall pay or issue (in accordance with
Section 2.4 of the Exchange Agreement) the Exchange Consideration.

         (b)     DEPOSIT OF EXCHANGE CONSIDERATION.  At the Closing, Tom Brown
shall deposit with the Exchange Agent, the Exchange Consideration, including
certificates representing the Exchange Common Stock.  The Cash Consideration
shall be tendered and paid to the Exchange Agent in immediately available
funds.  The Exchange Agent shall hold and distribute the Exchange Consideration
in accordance with the Plan.

         (c)     DELIVERY TO REORGANIZED PRESIDIO.  Any portion of the Exchange
Consideration held by the Exchange Agent that is not distributed pursuant to
the Plan within ninety (90) days after the Closing Date shall, upon Reorganized
Presidio's request, be delivered to Reorganized Presidio.  Thereafter, a
Distributee shall look only to the Reorganized Presidio for distribution of
that portion and amount of the Exchange Consideration (including any dividends
or distributions made in respect of Exchange Common Stock but excluding
interest on such amount) that such Distributee is entitled to receive pursuant
to the Plan.





                                       19
<PAGE>   20
         7.02    PROCEDURES FOR THE EXCHANGE AND SURRENDER OF INSTRUMENTS.

         (a)     DEBT INSTRUMENTS.  No distribution shall be made to or on
behalf of a holder of a Claim in Classes 2, 3, 5, 7, or 9 under the Plan unless
and until such holder, in accordance with written instructions to such holder
from Presidio, shall have surrendered to the Exchange Agent, as may be
applicable, the promissory notes and any other instruments representing such
holder's Allowed Bank Claims in the case of Class 2 Claims, all certificates
and any other instruments representing such holder's Allowed Senior Secured
Note Claims in the case of Class 3 Claims, all certificates and any other
instruments representing such holder's Allowed Senior GIN Claims in the case of
Class 5 Claims, all certificates and other instruments representing such
holder's Allowed Subordinated GIN Convenience Claims in the case of Class 7
Claims, and all certificates and other instruments representing such holder's
Allowed Subordinated Debenture Claims in the case of Class 9 Claims;

         (b)     PRESIDIO COMMON STOCK.  Distributions, if any, to be made to
or on behalf of a holder of a Class 12 Equity Interest under the Plan shall not
be made unless and until such holder, in accordance with written instructions
to such holder from Presidio, shall have surrendered to the Exchange Agent all
certificates and other instruments representing its Presidio Common Stock
certificate;

         (c)     LOST OR STOLEN INSTRUMENTS.  Any holder of a Claim or Equity
Interest in Classes 2, 3, 5, 7, 9 or 12 whose instruments or certificates
evidencing such Claims or Equity Interests have been lost, stolen, mutilated,
or destroyed shall, in lieu of surrendering such instruments, deliver to the
Exchange Agent (i) evidence satisfactory to Presidio and the Exchange Agent of
the loss, theft, mutilation, or destruction of such instruments or certificates
and (ii) such security or indemnity as may be reasonably required by Presidio
and the Exchange Agent to hold Presidio and the Exchange Agent harmless with
respect thereto; and,

         (d)     LIMITATION PERIOD FOR THE SURRENDER OF INSTRUMENTS.  Any
holder of a Claim or Equity Interest in Classes 2, 3, 5, 7, 9 or 12 that has
not satisfied the applicable requirements of this Section 7.02 of the Plan
within two (2) years after the Effective Date shall receive no distribution on
account of such Claims or Equity Interests, and shall be forever barred from
asserting such Claim or Equity Interest.  To the extent permitted by applicable
law, any Exchange Consideration which has not been distributed from and after
the second anniversary of the Effective Date (other than Exchange Consideration
reserved in connection with disputed Claims or Equity Interests) shall become
the property of Reorganized Presidio, free and clear of any Claims or Equity
Interests.

         7.03    CASH DISTRIBUTIONS UNDER PLAN.

         (a)     IN GENERAL.  Any cash distributions to Classes 2, 3, 7, and 12
provided for herein, or to Classes 5 or 9 if and to the extent provided in
Section 5.09(b), if applicable, shall be made by the Exchange Agent from the
Exchange Consideration.  All cash distributions to other Classes shall





                                       20
<PAGE>   21
be made by the respective Reorganized Debtors obligated thereon from their
respective cash balances and operations; provided, however, that the Debtors
and the Reorganized Debtors will be entitled to transfer funds between and
among themselves as they determine to be necessary or appropriate to enable
each Reorganized Debtor to satisfy its obligations under the Plan.

         (b)     TIMING.  Except as otherwise provided (and subject to the
provisions herein relating to the surrender and exchange of instruments), the
Exchange Agent or the respective Debtors, as the case may be, shall make all
distributions of cash and property pursuant to the Plan on or within fifteen
(15) Business Days (x) after the Effective Date or (y) in the case of Disputed
Claims or Disputed Equity Interests, after a Claim or Equity Interest becomes
an Allowed Claim or Allowed Equity Interest.

         (c)     INVESTMENT IN CASH.  Cash held by the Exchange Agent or
otherwise held by the Debtors for distribution hereunder shall be invested by
the Exchange Agent in United States Treasury Bills, interest-bearing
certificates of deposit, interest-bearing savings accounts and investments
permitted by Section 345 of the Bankruptcy Code.

         (d)     MANNER OF PAYMENT UNDER PLAN.  Any payment of Cash made by the
Exchange Agent or Debtors, respectively, pursuant to the Plan may be made
either by check drawn on a domestic bank or by wire transfer from a domestic
bank, at the option of the Exchange Agent or Debtors, respectively.

         (e)     FRACTIONAL DOLLARS/SHARES.  No fractional shares of the
Exchange Common Stock shall be issued to a Distributee.  The Exchange Agent
shall, on behalf of all Distributees otherwise entitled to receive fractional
shares of Exchange Common Stock, promptly following the Closing, aggregate such
fractional shares of Exchange Common Stock and sell the resulting whole shares
of Exchange Common Stock for the account of such Distributees, and such
Distributees shall be entitled to receive their allocable portion of the net
proceeds of the sale thereof.

         (f)     DE MINIMIS DISTRIBUTIONS.  Except for distributions pursuant
to Sections 5.06 or 7.03(e) of the Plan, no cash payment of less than $5.00
shall be made by the Exchange Agent or the Debtors, respectively, to any holder
of a Claim unless a request therefor is made in writing to the party, including
the Exchange Agent or Debtors, respectively, responsible hereunder for making
such payment.

         7.04    RESERVE OF CASH FOR DISPUTED ADMINISTRATIVE EXPENSE CLAIMS,
PRIORITY TAX CLAIMS, PRIORITY CLAIMS, MISCELLANEOUS SECURED CLAIMS, AND GENERAL
UNSECURED CLAIMS.  In the sole discretion of each Reorganized Debtor, such
Reorganized Debtor may segregate from its available cash an amount of cash
equal to such Debtor's estimate of its disputed Administrative Expense Claims,
Priority Tax Claims, Priority Claims, Miscellaneous Secured Claims, and General
Unsecured Claims allegedly owed by such Debtor.  Cash, if any, so segregated
shall be held in interest bearing accounts for the benefit of holders of such
Disputed Claims pending determination of their entitlement thereto.  Such
Reorganized Debtor shall have the right to seek an order of the





                                       21
<PAGE>   22
Bankruptcy Court, after notice and a hearing, estimating or limiting the amount
of any Disputed Claim for purposes of such discretionary reserves.

         7.05    DISTRIBUTION OF SEGREGATED CASH FUND.  Cash segregated
pursuant to Section 7.04 hereof shall be distributed by the respective
Reorganized Debtor to the holder of a disputed Administrative Expense Claim,
Priority Tax Claim, Priority Claim, Miscellaneous Secured Claim or General
Unsecured Claim, respectively, when, and to the extent that, (i) such Disputed
Claim becomes an Allowed Claim pursuant to a Final Order or (ii) the respective
Debtor otherwise compromises and settles any such Disputed Claim subject to the
approval of the Bankruptcy Court.  Such distribution shall be made to the
holder of such Claim in accordance with the terms of the Plan to the extent
such Disputed Claim becomes an Allowed Claim.  To the extent that such a
Disputed Claim ultimately becomes an Allowed Claim in an amount less than the
amount of the Disputed Claim, the resulting surplus shall be released to the
respective Debtor for its unrestricted use.

         7.06    ACCRUED DISTRIBUTIONS ON ACCOUNT OF ALLOWED CLAIMS AND ALLOWED
EQUITY INTERESTS.  The holder of an Allowed Claim or Allowed Equity Interest in
Classes 5, 9 and 12, and in Classes 2 and 3 if and to the extent provided in
Section 5.09(b), if applicable, otherwise entitled to a distribution under the
Plan shall be entitled to receive dividends and other distributions with
respect to the Exchange Common Stock to be distributed to such Distributee
pursuant to the Plan upon such holder's compliance with the requirements of
Section 7.02(a) or (b) of the Plan, as applicable.

         7.07    VOTING OF EXCHANGE COMMON STOCK BY HOLDERS OF ALLOWED CLAIMS
AND ALLOWED EQUITY INTERESTS.  Prior to full compliance by a holder of an
Allowed Claim or Allowed Equity Interest in Classes 5, 9 or 12, or in Classes 2
and 3 if and to the extent provided in Section 5.09(b), if applicable, with the
exchange and surrender requirements set forth in Section 7.02(a) or (b) of the
Plan, as applicable, and the actual distribution by the Exchange Agent to such
holder of any shares of Exchange Common Stock to such holder in accordance with
the Plan, such holder shall have no right to vote such shares of Exchange
Common Stock or to direct or request the Exchange Agent, Reorganized Presidio,
or any other person to vote or to refrain from voting such shares.

         7.08    RESOLUTION OF DISPUTED CLAIMS.  The Debtors, Tom Brown, or
Reorganized Presidio, as the case may be, shall determine whether any Claim is
disputed.  After such determination, the respective Debtor, Tom Brown, or
Reorganized Presidio shall file an objection to each such Disputed Claim and
shall serve a copy of the objection on the holder thereof as soon as
practicable.  Unless otherwise provided by the Plan or ordered by the
Bankruptcy Court, all objections by any Debtor, Tom Brown, Reorganized
Presidio, or any other party in interest to any Claims must be filed and served
upon the holders of such Claims (and upon counsel for the Debtors and Tom Brown
if filed by another party in interest) on or before 180 days after the
Effective Date.





                                       22
<PAGE>   23
                                  ARTICLE VIII

                          MEANS FOR EXECUTION OF PLAN

         8.01     GENERAL.  Subject to the provisions of the Plan and the
Exchange Agreement, on the Effective Date, Tom Brown shall be the holder of one
hundred percent (100%) of the then-issued and outstanding stock of Reorganized
Presidio.  The Bank Claims and the Debt Obligations shall be discharged.

         8.02     CORPORATE ACTION.  (a)  Upon entry of the Confirmation Order,
all actions reasonably required in and by virtue of the Exchange Agreement and
the Plan, including, without limitation, the items expressly enumerated in
either the Exchange Agreement or in the Plan, shall be authorized and approved
in all respects and will occur and be effective without further action,
authorization, or approval by the Debtors, any of the Debtors' shareholders,
officers, or directors, or, except as enumerated herein or in the Bankruptcy
Code, by the Bankruptcy Court.

         (b)     On or before the Effective Date, or as soon thereafter as is
practicable, Presidio shall file with the Secretary of State of the State of
Delaware in accordance with section 303 of the DGCL the Proposed Amendment that
shall, among other things, prohibit each Debtor from creating, designating,
authorizing or causing to be issued any class or series of nonvoting stock.  On
the Effective Date, the Proposed Amendments to the articles or certificate of
incorporation of each Debtor shall automatically become effective, and all
other matters provided under the Plan involving the corporate structure of any
of the Debtors or Reorganized Presidio, or corporate action by any of these,
shall be deemed to have occurred and shall be in effect from and after the
Effective Date pursuant to section 303 of the DGCL without any requirement of
further action by the stockholders, the directors of Reorganized Presidio, or
Reorganized Presidio.

         (c)     On and after the Confirmation Date, the appropriate officers
of each of the Debtors are authorized and directed to execute and deliver, in
the name and on behalf of each Debtor, all agreements, documents and
instruments contemplated by the Plan and the Disclosure Statement.

         (d)     The Exchange Agreement; the adoption of new or amended and
restated certificates or articles of incorporation and by-laws or regulations
or similar constituent documents for the Reorganized Debtors; the initial
selection of directors and officers for the Reorganized Debtors; the
distribution of cash pursuant to the Exchange Agreement; the issuance and
distribution of Exchange Common Stock pursuant to the Exchange Agreement; the
grant of mortgages, deeds of trust, liens and other security interests; the
adoption, execution, delivery and implementation of all contracts, leases,
instruments, releases, indentures and other agreements or documents related to
any of the foregoing; the adoption, execution and implementation of employment,
retirement and indemnification agreements, incentive compensation programs,
retirement income plans, welfare benefit plans and other employee plans and
related agreements; and the other matters provided for under the Plan or the
Exchange Agreement involving the corporate structure of any Debtor or
Reorganized Debtor or corporate action to be taken by or required of any Debtor
or Reorganized





                                       23
<PAGE>   24
Debtor will occur and be effective as provided herein and/or in the Exchange
Agreement, and will be authorized and approved in all respects and for all
purposes without any requirement of further action by stockholders or directors
of any of the Debtors or the Reorganized Debtors.

         (e)     In the event that, notwithstanding Article II of the Exchange
Agreement and Section 8.05 of the Plan, the Presidio Common Stock held by Class
12 is canceled (rather than transferred to Tom Brown as contemplated by Section
8.05 of the Plan), upon the Effective Date, 1000 shares of Presidio Common
Stock will then be transferred to Tom Brown upon the Effective Date and upon
Tom Brown paying $100 to Presidio in cash.

         8.03    STATUS OF TOM BROWN, INC.  Tom Brown shall be deemed an
affiliate or successor to the Debtors for the purposes of subsections 1125(e)
and 1145(a) of the Bankruptcy Code incident to the issuance and distribution of
the Exchange Common Stock and any shares of Tom Brown Common Stock issued
pursuant to Section 4.22 of the Exchange Agreement, and not to be an
underwriter thereof for any purpose.  However, Tom Brown shall have no
obligation to the Debtors except as specified in the Exchange Agreement and
does not otherwise assume any liabilities of any of the Debtors.  No holder of
any Claim or Equity Interest in or against any of the Debtors (other than
Presidio and Tom Brown or as otherwise provided in Sections 4.15, 4.22, 4.24,
4.25, and 10.06 of the Exchange Agreement) shall have any standing to enforce
the Exchange Agreement or to seek any remedy thereunder whatsoever.

         8.04    IMPLEMENTATION OF THE EXCHANGE AGREEMENT.  From and after the
Confirmation Date, the Debtors shall take all actions contemplated in the
Exchange Agreement in anticipation of and in preparation for Closing and shall
take all actions as and when contemplated in the Exchange Agreement to
implement the Exchange Agreement.

         8.05    ASSIGNMENT TO TOM BROWN OF BANK CLAIMS, GUARANTIES OF THE BANK
CLAIMS, SENIOR SECURED NOTES, SENIOR GAS INDEXED NOTES, SUBORDINATED GAS
INDEXED NOTES, SUBORDINATED DEBENTURES, SUBSIDIARY GUARANTIES THEREOF, PRESIDIO
COMMON STOCK, PRESIDIO STOCK OPTIONS, AND PRESIDIO WARRANTS, AND CANCELLATION
OF CERTAIN OTHER AGREEMENTS.  On the Effective Date, except to the extent
already owned by Tom Brown or canceled pursuant to the Plan of Reorganization,
all of (a) the Bank Claims, (b) the Debt Obligations and (c) the Presidio
Common Stock shall be transferred absolutely and unconditionally to Tom Brown
in exchange for that portion and amount of the Exchange Consideration (if any)
allocated to the existing holders of such Claims and Equity Interests as are
Allowed Claims or Allowed Equity Interests, pursuant to the Plan.  Upon
delivery of the Exchange Consideration to the Exchange Agent as provided in
Section 2.4 of the Exchange Agreement, Tom Brown shall be deemed the sole
equity holder, and the sole holder of the Bank Claims (subject to the
provisions of Section 5.01 of the Plan requiring contemporaneous payment to the
Agent Bank) and Debt Obligations, and Presidio's obligations to the holders of
the (a) Bank Claims, (b) the Debt Obligations and (c) the Presidio Common Stock
under the Plan shall be deemed to be satisfied in full and discharged.  As of
the Closing Date, the Presidio Stock Options and Presidio Warrants shall be
canceled pursuant to the Plan.  Tom Brown, as the sole stockholder of Presidio,
shall, immediately following the Exchange described in Section





                                       24
<PAGE>   25
2.1 of the Exchange Agreement, contribute to Presidio all of the Bank Claims
and Debt Obligations.  No additional shares of Presidio capital stock shall be
issued to Tom Brown in exchange therefor.  The Bank Claims and Debt Obligations
shall thereupon be canceled, terminated, and discharged.

         8.06    EXECUTORY CONTRACTS AND UNEXPIRED LEASES GENERALLY.

                 (a)      On the Effective Date, to the extent permitted by
applicable law and subject to Section 8.07 hereof, all executory contracts and
unexpired leases of the respective Debtors will be assumed in accordance with
the provisions of Section 365 of the Bankruptcy Code concurrently with and by
virtue of entry of the Confirmation Order (or at the option of Tom Brown, by
separate order(s) at such time) other than (i) any and all executory contracts
and unexpired leases which are the subject of separate motions filed pursuant
to Section 365 of the Bankruptcy Code by any of the Debtors prior to the
Confirmation Date, and (ii) any and all executory contracts and unexpired
leases rejected prior to entry of the Confirmation Order.

                 (b)      All proofs of claim evidencing any Claims arising out
of the rejection of contracts or leases at or concurrently with entry of the
Confirmation Order under subsection (a) of this Section 8.06 must be filed with
the Bankruptcy Court within thirty (30) days after the Confirmation Date or be
forever barred.  Any Claims arising out of a contract or lease rejected after
the Confirmation Date shall be filed within thirty (30) days of entry of the
order permitting such rejection unless a different bar date is established in
such order.

         8.07    DESIGNATED CONTRACTS.  On or before the Effective Date, the
Designated Contracts shall be assumed by the applicable Debtors pursuant to
Section 365 of the Bankruptcy Code in accordance with the provisions of the
Designated Contract Order.

         8.08    EXEMPTION FROM CERTAIN TRANSFER TAXES.  The designated
officers of each Debtor or Reorganized Debtor or such other persons as the
Bankruptcy Court may designate will be authorized to execute, deliver, file or
record such contracts, instruments, releases, indentures and other agreements
or documents and take such actions as may be necessary or appropriate to
effectuate and implement the provisions of the Plan.  The Secretary or any
Assistant Secretary of each Debtor or Reorganized Debtor or such other persons
as the Bankruptcy Court may designate will be authorized, pursuant to
subsection 1146(c) of the Bankruptcy Code, to certify or attest to any of the
foregoing actions.  Neither (a) the issuance, transfer or exchange of the
Exchange Common Stock; (b) the creation of any mortgage, deed of trust or other
security interest; (c) the making or assignment of any lease or sublease; nor
(d) the making or delivery of any deed or other instrument of transfer under,
in furtherance of, or in connection with, the Plan, will be subject to any
stamp tax, real estate transfer tax or similar tax.

         8.09    RESIGNATION OF DEBTORS' DIRECTORS AND OFFICERS AND ELECTION OF
NEW DIRECTORS AND OFFICERS.  The directors and officers of each of the Debtors
immediately prior to the Effective Date shall resign as of the Closing Date,
and shall thereupon be replaced by designees of Tom Brown who shall be
identified at or prior to the conclusion of the Confirmation Hearing.





                                       25
<PAGE>   26
         8.10    EFFECT OF TERMINATION OF THE EXCHANGE AGREEMENT PRIOR TO
CLOSING.  If the Exchange Agreement is terminated after the Confirmation Date
but prior to Closing, (a) any cancellation of instruments otherwise effected by
any provision of this Plan shall be rendered null and void, (b) any instruments
surrendered by or on behalf of the previous holders thereof pursuant to any
provision of this Plan shall be returned to the party who surrendered same, and
the rights and privileges of the holders thereof shall be reinstated subject to
the Chapter 11 Cases of the Debtors, (c) the automatic stay shall be
reinstated, (d) the Confirmation Order shall, upon request of the Debtors, be
vacated so that another plan of reorganization may be subsequently confirmed
and, in the event of such termination and vacatur, (i) each of the Debtors
shall continue in their Chapter 11 Cases as debtors-in-possession as if the
Confirmation Order had not been entered, (ii) any unexpired lease or executory
contract assumed or rejected solely by virtue of entry of the Confirmation
Order (and not assumed or rejected by a separate order or by operation of law)
shall be treated as if it had neither been assumed nor rejected and shall
remain subject to rejection, assumption, and assignment, (iii) the Debtors'
corporate structure shall be restored as it existed immediately prior to entry
of the Confirmation Order, and (iv) all rights, privileges, powers, and duties
incident to the Chapter 11 Cases shall be restored to the Debtors as if the
Plan had not been confirmed.

         8.11    SUBORDINATION.  The provisions of the Plan, including, without
limitation, the distribution provisions hereof, take into account the relative
priority of the Claims and Equity Interests in each class in connection with
any contractual subordination provisions relating thereto, together with other
factors such as concessions or tentative concessions by one or more of the
classes entitled to assert subordination rights, the costs of an extended
bankruptcy proceeding, and the costs of a contested confirmation proceeding.
Accordingly, except as to Classes 9 and 12 if Classes 5, 9, or 12 shall have
rejected the Plan (so that receipt of a distribution by Classes 9 or 12 is
eliminated), the distributions to the holders of any Claim or Equity Interest
in Presidio Common Stock shall not be subject to levy, garnishment, attachment
or other legal process by any holder of any other Claim or Equity Interest or
class of Claims or Equity Interests by reason of claimed contractual
subordination rights, and on the Effective Date, all holders of impaired Claims
and impaired Equity Interests will be deemed to have waived any and all
contractual subordination rights which they may have with respect to such
distributions.  In such case, the Confirmation Order shall permanently enjoin,
as of the Effective Date, all holders of impaired Claims and impaired Equity
Interests from enforcing or attempting to enforce any such rights with respect
to the distributions under the Plan to the holders of any other Claim or Equity
Interest.

         8.12    RETIREE AND OTHER BENEFITS.  Pursuant to subsection
1129(a)(13) of the Bankruptcy Code, each Debtor will continue to pay retiree
benefits (as that term is defined in Section 1114 of the Bankruptcy Code) on
which it is obligated at the level established pursuant to subsection (e)(1)(B)
or (g) of Section 1114, at any time prior to confirmation of the Plan, for the
duration of the period such Debtor, as the case may be, has obligated itself to
provide such benefits.  All obligations of any Debtor with respect to the
Existing Plans shall be performed in accordance with the Exchange Agreement and
to the extent not required thereunder to be so performed at the Closing all
such obligations shall be treated as Miscellaneous Unsecured Claims.





                                       26
<PAGE>   27
         8.13    NO SUBSTANTIVE CONSOLIDATION.  The Debtors are not
substantively consolidated in or by virtue of the Plan.  Except as otherwise
expressly provided herein, no Debtor is assuming the pre-Effective Date
obligations of any other Debtor.  Joint references to or groupings of classes
of more than one Debtor in any article, section, subsection, or paragraph of
the Plan are for convenience and ease of reference only, and do not indicate
the assumption of liabilities of any of the Debtors by any of the other
Debtors.

                                   ARTICLE IX

                              CONDITIONS PRECEDENT

         9.01    CONDITIONS PRECEDENT TO ENTRY OF THE CONFIRMATION ORDER.  The
Confirmation Order shall not be entered by the Bankruptcy Court:

                 (a)      unless the Bankruptcy Court shall have entered the
Administrative Bar Date Order in accordance with Section 3.05 of the Plan; or,

                 (b)      if Tom Brown has previously exercised its right to
terminate the Exchange  Agreement pursuant to Section 9.1(b) or (c) of the
Exchange Agreement.

         9.02    CONDITIONS PRECEDENT TO THE EFFECTIVE DATE.  The Plan shall
not become effective and the Closing Date shall not occur unless all conditions
precedent to the obligations of the Debtors and Tom Brown pursuant to Article
VIII (Conditions to Closing) of the Exchange Agreement have been satisfied or
duly waived in accordance with the provisions of the Exchange Agreement.

                                   ARTICLE X

                        EFFECT OF PLAN CONFIRMATION,
                          DISCHARGE INJUNCTION AND
                            SUBORDINATION RIGHTS

         10.01   DISCHARGE OF THE DEBTORS.  Except as otherwise expressly
provided in the Plan, confirmation of the Plan shall (i) bind all holders of
Claims and Equity Interests, whether or not they accept the Plan, and (ii)
discharge each Debtor from any Claim and any "debt" (as that term is defined in
subsection 101(12) of the Bankruptcy Code) incurred before the Confirmation
Date, together with any obligation under any Subsidiary Guaranty, and each
Debtor's liability in respect of each of the foregoing shall be extinguished
completely, including, without limitation, any liability of a kind which is
disallowed pursuant to the Bankruptcy Code, including subsections 502(b)(6),
502(g) and 502(e) thereof.  In addition, except as otherwise provided in the
Plan, confirmation of the Plan pursuant to the Confirmation Order shall act as
a discharge, effective as of the Confirmation Date, as to each holder of a
Claim or Equity Interest in respect of any direct or indirect right or Claim or
Equity Interest such holder had or may have had against or in any of the
Debtors that arose at any time prior to the Effective Date.





                                       27
<PAGE>   28
         10.02   REVESTING.  On the Confirmation Date, each of the Debtors will
be revested with all of the property of its respective Estate, free and clear
of all claims, liens, encumbrances, charges and other interests of holders of
Claims and Equity Interests except as otherwise provided in the Plan, and may
thereupon operate its business free of any restrictions imposed by the
Bankruptcy Code or by the Bankruptcy Court.

         10.03   POST-CONFIRMATION RELEASES AND INJUNCTIONS GENERALLY.  Holders
of Claims and Equity Interests will be deemed to forever release, waive and
discharge, and to be enjoined from asserting, to the fullest extent permitted
under applicable law, all claims (as defined in subsection 101(5) of the
Bankruptcy Code), demands, debts, rights, causes of action, and liabilities in
connection with or related to the Exchange Agreement, the Chapter 11 Cases, the
Debtors, or the Plan, whether such claims are liquidated or unliquidated, fixed
or contingent, matured or unmatured, known or unknown, foreseen or unforeseen,
then existing or thereafter arising, that are based in whole or in part on any
act, omission, or other occurrence taking place on or prior to the Effective
Date and that may be asserted by or on behalf of such parties against the
Debtors, the Reorganized Debtors, Tom Brown, or their respective agents,
advisors, attorneys and representatives (including current and former
directors, officers, employees, members and professionals) acting in such
capacity.

         10.04   POST-CONFIRMATION INJUNCTION WITH RESPECT TO OIL AND GAS
ASSETS.  From and after the Effective Date, each and every owner or holder of a
working interest, royalty interest, overriding royalty interest, production
payment or other interest in any well or pool of wells for which any Debtor
serves or served as lessee or operator, as the case may be, and any partner,
limited partner, or joint venturer with any Debtor in any well, pool of wells,
or oil, gas or mineral estate, shall, as of the Petition Date(s) and
thereafter, and in accordance with the Designated Contract Order, be
permanently enjoined from asserting or taking any action to assert, directly or
indirectly, that (i) the occurrence of a Bankruptcy Event and (ii) the
insolvency or financial condition of any Debtor prior to the Effective Date
constitutes a basis for removal of any Debtor as operator under any Designated
Contract.

         10.05   FAILURE OF COURT TO EXERCISE JURISDICTION.  If the Bankruptcy
Court abstains from exercising or declines to exercise jurisdiction, or is
otherwise without jurisdiction over any matter arising out of the Chapter 11
Case(s), including the matters set forth in this Article X, this Article X
shall not prohibit or limit the exercise of jurisdiction by any other court
having competent jurisdiction with respect to such matter.

         10.06   TERM OF INJUNCTIONS OR STAYS.  Unless otherwise provided, all
injunctions or stays provided for in the Chapter 11 Case(s) pursuant to
sections 105 or 362 of the Bankruptcy Code or otherwise and in effect on the
Confirmation Date shall remain in full force and effect until the Closing Date.

         10.07   DEEMED RELEASE OF CLAIMS BY THE DEBTORS AND BY THIRD-PARTIES
AGAINST OFFICERS AND DIRECTORS.  (a)  All claims for liability which the
Debtors may otherwise have been entitled to





                                       28
<PAGE>   29
assert, whether in their capacities as corporations or as debtors in possession
by operation of the Bankruptcy Code, against the present directors and officers
and any former directors or officers that were directors or officers of one or
more of the Debtors on or before the Petition Date, pertaining to any
obligations, actions, or omissions which may have arisen or occurred prior to
the Effective Date, or as may arise or which may have arisen on, before, or in
connection with the Effective Date and Closing, shall be deemed released upon
the occurrence of the Effective Date, without the need for the execution of any
further agreement or release, and such release shall be binding upon any party
who may otherwise have asserted such claims derivatively.

         (b)     On the Effective Date, each holder of a Claim or Equity
Interest shall be deemed to release any claim for liability which such holder
may otherwise have been entitled to assert against the Debtors' present and
former directors or officers that were directors or officers of one or more of
the Debtors on or before the Petition Date, pertaining to any obligations,
actions, or omissions which may have arisen or occurred prior to the Effective
Date or as may arise or which may have arisen on, before, or in connection with
the Effective Date and Closing, without the need for the execution of any
further agreement or release, unless such holder shall have affirmatively
opted, in the appropriate space provided in the official ballot approved by the
Bankruptcy Court for accepting or rejecting the Plan, not to grant such release
(and thereby elects instead to retain its rights against such non-debtor
directors and officers).  All brokers and intermediaries who receive ballots
from any holder of public debt and who submit summary ballots based thereon
shall be required to maintain any and all ballots wherein the holder has opted
not to grant such release for a period of three (3) years following the
Effective Date.

                                   ARTICLE XI

                           RETENTION OF JURISDICTION

         11.01   Notwithstanding entry of the Confirmation Order or the
Effective Date having occurred, the Bankruptcy Court will retain jurisdiction:

         (a)     to determine the allowed amount of Disputed Claims;

         (b)     to determine the allowed amount of any Miscellaneous Secured
Claims and the extent of any liens asserted in connection therewith;

         (c)     to determine Fee Claims and requests for payment of Claims
entitled to priority under subsection 507(a)(1) of the Bankruptcy Code,
including compensation of and reimbursement of expenses of parties entitled
thereto;
         (d)     to resolve controversies and disputes regarding the
interpretation and implementation of this Plan;





                                       29
<PAGE>   30
         (e)     to enter orders in aid of this Plan, including, without
limitation, appropriate orders (which may include contempt or other sanctions)
to protect Reorganized Debtor(s);

         (f)     to modify this Plan or to remedy any apparent defect or
omission in this Plan; 

         (g)     to determine any and all applications, claims, adversary
proceedings and contested matters pending on the Confirmation Date or timely
filed pursuant to the Bankruptcy Code, this Plan, or an order of the Bankruptcy
Court; 

         (h)     to allow, disallow, estimate, liquidate or determine any Claim
or Fee Claim and to enter or enforce any order requiring the filing of any such
Claim or Fee Claim before a particular date;

         (i)     to determine any and all pending applications for the
assumption or rejection of executory contracts or unexpired leases, or for the
assignment of assumed executory contracts and unexpired leases, and to hear
determine and liquidate, any Claims arising therefrom;

         (j)     to recover all assets and property of the Debtors' Estates
pursuant to sections 542, 543, 544, 545, 547, 548, 549, 550, 551 or 553 of the
Bankruptcy Code;

         (k)     to enter a final decree closing the Chapter 11 Case(s); and

         (l)     to determine such other matters that may arise in connection
with the Chapter 11 Case (s), this Plan or the Confirmation Order.

                                  ARTICLE XII

                            MISCELLANEOUS PROVISIONS

         12.01   SUBSTANTIAL CONSUMMATION.  Substantial consummation, for
purposes of Section 1127 of the Bankruptcy Code, shall occur concurrently with
the completion of Closing.

         12.02   NO LIABILITY FOR UNCLAIMED OR ESCHEATED DISTRIBUTIONS.  None
of the Debtors, Tom Brown, the Exchange Agent, or any other person shall be
liable to any Distributee or holder of any other Claim or Equity Interest for
any amount properly delivered to any public official pursuant to any applicable
abandoned property, escheat, or similar law.  Any amounts remaining unclaimed
for a period of two (2) years following the Closing (or such earlier date
immediately prior to the time at which such amounts would otherwise escheat to
or become property of any governmental entity) shall, to the extent permitted
by applicable law, become the property of the Reorganized Debtors, free and
clear of any Claims or Equity Interests of any such Distributee or of any
holder of any other Claim or Equity Interest or their successors, assigns, or
personal representatives previously entitled thereto.





                                       30
<PAGE>   31
         12.03   MODIFICATION OF PLAN.  Subject to the limitations set forth in
the Bankruptcy Code and the Exchange Agreement, the Plan may be amended or
modified (a) upon the mutual consent of Tom Brown and the Debtors or, (b) in
the event the Exchange Agreement is terminated in accordance with its terms, by
the Debtors.

         12.04   WITHDRAWAL OF PLAN.  In the event the Exchange Agreement is
terminated in accordance with its terms, the Debtors reserve the right, at any
time prior to entry of the Confirmation Order, to revoke or withdraw the Plan.

         12.05   NOTICES.  From and after the Effective Date, all notices which
are required or may be given pursuant to the Plan or the Exchange Agreement
shall be sufficient in all respects if given in writing and delivered
personally, by telecopy or by registered or certified mail, postage prepaid, as
follows:

         IF TO PRESIDIO OR ANY OTHER DEBTOR:

                 c/o Presidio Exploration, Inc.
                 5613 DTC Parkway, Suite 750
                 P.O. Box 6525
                 Englewood, Colorado 80155-6525
                 Attention:  President
                 Telephone:  (303) 773-0100
                 Fax:        (303) 850-1111

         IF TO TOM BROWN:

                 Tom Brown, Inc.
                 508 West Wall, Suite 500
                 Midland, Texas 79702
                 Attention:  Donald L. Evans
                 Telephone:  (915) 682-9715
                 Fax:        (915) 683-9327

All notices shall be deemed to have been duly given at the time of receipt by
the party to which such notice is addressed.

         12.06   COMMITTEES.  The appointment of all statutory committees shall
terminate on the Effective Date except as provided in the Confirmation Order.

         12.07   CONSTRUCTION.  In the event of any conflict between the terms
of the Plan and the Disclosure Statement, the terms of the Plan shall control.





                                       31
<PAGE>   32
         12.08   WITHHOLDING AND REPORTING REQUIREMENTS.  In connection with
the Plan and all instruments issued in connection herewith and distributions
hereunder, Reorganized Presidio shall comply with all withholding and reporting
requirements imposed by any federal, state, local or foreign taxing authority
and all distributions hereunder shall be subject to such withholding and
reporting requirements.

         12.09   BINDING EFFECT.  This Plan shall be binding upon and inure to
the benefit of each Debtor, Tom Brown, the holders of Claims, the holders of
Equity Interests, other parties enumerated herein, all other parties in
interest, and their respective successors and assigns.

         12.10   GOVERNING LAW.  THE EXCHANGE AGREEMENT, THOSE PROVISIONS OF
THIS PLAN WHICH ARE SUBJECT TO STATE LAW, AND THE LEGAL RELATIONS BETWEEN THE
PARTIES TO THE EXCHANGE AGREEMENT AND





                                       32
<PAGE>   33
UNDER THIS PLAN SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF TEXAS WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS
OTHERWISE APPLICABLE TO SUCH DETERMINATIONS.

Dated:  Wilmington, Delaware
        August 5, 1996
                                        PRESIDIO OIL COMPANY


                                        By:
                                           ------------------------------------
                                           Its:

                                        - and -

                                        PRESIDIO EXPLORATION, INC.


                                        By:------------------------------------
                                           
                                           Its:

                                        - and -

                                        PALISADE OIL, INC.


                                        By:
                                           ------------------------------------
                                           Its:

                                        - and -

                                        PRESIDIO WEST VIRGINIA, INC.


                                        By:
                                           ------------------------------------
                                           Its:

                                        - and -

                                        TOM BROWN, INC.


                                        By:
                                           ------------------------------------
                                           Its:





                                       33
<PAGE>   34
================================================================================




                               EXCHANGE AGREEMENT



                                  BY AND AMONG



                             PRESIDIO OIL COMPANY,

                          PRESIDIO EXPLORATION, INC.,

                         PRESIDIO WEST VIRGINIA, INC.,

                              PALISADE OIL, INC.,

                                      AND

                                TOM BROWN, INC.





                              Dated August 5, 1996



================================================================================
<PAGE>   35
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                     Page
         <S>     <C>                                                                                                   <C>
                                                        ARTICLE I

                                                       DEFINITIONS
                                                       -----------

         1.1     Defined Terms  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                                                                                                                        -
         1.2     References and Titles  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                                                                                                                       --

                                                        ARTICLE II

                                                       THE EXCHANGE
                                                       ------------

         2.1     Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                                                                                                                       --
         2.2     Directors and Officers of the Presidio Parties . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.3     Exchange Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.4     Exchange Fund  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.5     Tom Brown Distributions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.6     No Further Ownership Rights in Presidio Securities . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.7     No Fractional Shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                                       --
         2.9     No Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --
         2.10    Lost, Stolen, or Destroyed Certificates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --
         2.11    Merger Alternative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --

                                                       ARTICLE III

                                             CLOSING AND PRE-CLOSING ACTIONS
                                             -------------------------------

         3.1     Time and Place of Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --
         3.2     Adjustment to Common Share Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                                                                                                                       --

                                                        ARTICLE IV

                                                        COVENANTS
                                                        ---------

         4.1     Access to Assets, Personnel, and Information . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                                                                                                                       --
         4.2     Confidentiality Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                                                                                                                       --
         4.3     Indemnity Regarding Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
         4.4     Tom Brown to Vote for Plan of Reorganization . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
         4.5     Petition Under the Bankruptcy Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
         4.6     Preparation of Disclosure Statement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                                                                                                                       --
         4.7     Disclosure Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
                                                                                                                       --
         4.8     Solicitation of Presidio Securityholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
                                                                                                                       --
</TABLE>





                                      -i-
<PAGE>   36
                          TABLE OF CONTENTS, CONTINUED

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
         <S>     <C>                                                                                                   <C>
         4.9     Cooperation; Notification of Certain Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
         4.10    Listing Application  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
         4.11    Third Party Consents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
         4.12    Agreements of Affiliates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
         4.13    Amendment to Plan  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                                                                                                                       --
         4.14    Costs and Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                                                                                                                       --
         4.15    New D&O Insurance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                                                                                                                       --
         4.16    Information Kept Confidential  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                                                                                                                       --
         4.17    Pre-Closing Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                                                                                                                       --
         4.18    Public Announcements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                                                                                                                       --
         4.19    Conduct of Presidio's Business Pending Closing . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
                                                                                                                       --
         4.20    No Solicitation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                                                                                                                       --
         4.21    Employees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                                                       --
         4.22    Severance Plan and Agreements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                                                       --
         4.23    Presidio ESOP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
         4.24    Presidio 401K  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
         4.25    Other Plans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
         4.26    Letters of Credit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
         4.27    Certain Tom Brown Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --

                                                        ARTICLE V

                                        REPRESENTATIONS AND WARRANTIES OF PRESIDIO
                                        ------------------------------------------

         5.1     Disclaimers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
                                                                                                                       --
         5.2     Existence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                                                                                                                       --
         5.3     Authorization and Enforceability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                                                                                                                       --
         5.4     No Violations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                                                                                                                       --
         5.5     Claims and Litigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
         5.6     Consents and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
         5.7     Presidio SEC Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
         5.8     Taxes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
         5.9     Employee Benefit Plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                                                                                                                       --
         5.10    Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
         5.11    Capital Structure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
         5.12    No Undisclosed Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
         5.13    Absence of Certain Changes or Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
         5.14    Governmental Regulation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                                                                                                                       --
         5.15    Labor Matters  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                                                                                                                       --
         5.16    Accounts Receivable  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                                                                                                                       --
         5.17    Intangible Property  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
</TABLE>





                                      -ii-
<PAGE>   37
                          TABLE OF CONTENTS, CONTINUED

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
         <S>     <C>                                                                                                   <C>
         5.18    Presidio's Title . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
         5.19    Reserve Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
         5.20    Oil and Gas Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
         5.21    Environmental Matters  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                                                                                                                       --
         5.22    Brokers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
         5.23    Compliance with Law; Governmental Authorizations . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
         5.24    Insurance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
         5.25    Contracts, Agreements, Commitments and Other Matters . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
         5.26    Fairness Opinion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
                                                                                                                       --

                                                        ARTICLE VI

                                       REPRESENTATIONS AND WARRANTIES OF TOM BROWN
                                       -------------------------------------------

         6.1     Existence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.2     Authorization and Enforceability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.3     No Violations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.4     Consents and Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.5     Tom Brown SEC Documents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.6     Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
                                                                                                                       --
         6.7     Capital Structure  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
         6.8     Claims and Litigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
         6.9     Financing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
                                                                                                                       --

                                                       ARTICLE VII

                                         NATURE OF REPRESENTATIONS AND WARRANTIES
                                         ----------------------------------------

         7.1     Limited Recourse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
                                                                                                                       --
         7.2     Nonsurvival of Representations, Warranties, Covenants, and Agreements  . . . . . . . . . . . . . . .  45
                                                                                                                       --

                                                       ARTICLE VIII

                                                  CONDITIONS TO CLOSING
                                                  ---------------------

         8.1     Conditions Precedent to the Obligations of Presidio  . . . . . . . . . . . . . . . . . . . . . . . .  45
                                                                                                                       --
         8.2     Conditions Precedent to the Obligations of Tom Brown . . . . . . . . . . . . . . . . . . . . . . . .  46
                                                                                                                       --
</TABLE>





                                     -iii-
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                          TABLE OF CONTENTS, CONTINUED

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
         <S>                                                                                                           <C>
                                                        ARTICLE IX

                                                       TERMINATION
                                                       -----------

         9.1     Termination Rights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
                                                                                                                       --
         9.2     Payment of Termination Expenses and Fee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                                                                                                                       --
         9.3     Effect of Termination  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                                                                                                                       --

                                                        ARTICLE X

                                                      MISCELLANEOUS
                                                      -------------

         10.1    Counterparts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                                                                                                                       --
         10.2    Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
                                                                                                                       --
         10.3    Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
                                                                                                                       --
         10.4    Captions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
                                                                                                                       --
         10.5    Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
                                                                                                                       --
         10.6    Entire Agreement; Third Party Beneficiaries  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
                                                                                                                       --
         10.7    Amendment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
                                                                                                                       --
         10.8    Exhibits and Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
                                                                                                                       --
         10.9    Severability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
                                                                                                                       --

                                                     LIST OF EXHIBITS

         Exhibit A        --      Leases
         Exhibit B        --      Wells
         Exhibit C        --      Form of Plan of Reorganization
         Exhibit D        --      Form of Disclosure Statement
         Exhibit E        --      Form of Affiliate Letter
</TABLE>





                                      -iv-
<PAGE>   39
                             LIST OF DEFINED TERMS

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
<S>                                                                                                                    <C>
1933 Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                                                                                                                        -
1934 Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                                                                                                                        -
401k Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
Acreage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                                                                                                                        -
Affiliate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
                                                                                                                        -
affiliates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
Aggregate Common Share Value  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Aggregate Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Allocated Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Alternative Transaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                                                                                                                       --
Bank Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Bankruptcy Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Bankruptcy Court  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Bankruptcy Event  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
Bar Date Order  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                                                                                                                       --
Cash Consideration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
CERCLA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
CERCLIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
                                                                                                                        -
Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --
Closing Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                                                                                                                       --
Code  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Common Share Value  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Confidentiality Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Confirmation Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Confirmation Order  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Contract  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
Debt Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Defensible Title  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Designated Contracts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Directors and Officers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Disclosure Statement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Distributee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Employee Benefit Plans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                                                                                                                       --
Environmental Laws  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Environmental Material  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
Environmental Response Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
ERISA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
ESOP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
Exchange Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
Exchange Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
</TABLE>





                                      -v-
<PAGE>   40
                            DEFINED TERMS, CONTINUED

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
<S>                                                                                                                    <C>
Exchange Consideration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
Existing Plans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
                                                                                                                        -
Final Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
GAAP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Governmental Authority  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Hart Scott Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
Initial Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
Knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Leases  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
                                                                                                                        -
Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
Lien  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Major Assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Material Contracts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
Merger  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                                                                       --
NASDAQ  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
New D&O Insurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
                                                                                                                       --
NRI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Oil and Gas Assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
                                                                                                                        -
Palisade Oil  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
                                                                                                                        -
Permitted Claims  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
                                                                                                                        -
Permitted Encumbrances  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
                                                                                                                        -
person  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Plan of Reorganization  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Plan Proponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Presidio  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Presidio Class A Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Presidio Class B Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Presidio Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
                                                                                                                       --
Presidio Common Stock Cash Consideration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Exploration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Options or Warrants  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
Presidio Parties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Representative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio SEC Documents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Presidio Securityholders  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
                                                                                                                       --
Presidio Tax Affiliates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
Presidio West Virginia  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Released Claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                                                                                                                       --
</TABLE>





                                      -vi-
<PAGE>   41
                            DEFINED TERMS, CONTINUED

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
<S>                                                                                                                    <C>
Releasing Parties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
                                                                                                                       --
Reorganization Cases  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
                                                                                                                       --
Reserve Report  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
Schedule and Exhibit Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
                                                                                                                       --
SEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
SEC Case  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Senior Gas Indexed Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Senior Gas Indexed Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Senior Secured Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Senior Secured Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Severance Plan and Agreements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                                                       --
Subordinated Gas Indexed Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Subordinated Gas Indexed Notes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Tax Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Termination Expenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                                                                                                                       --
Termination Fee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
                                                                                                                       --
Third Party Consent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
                                                                                                                       --
Tom Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Tom Brown Common Stock  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
                                                                                                                       --
Tom Brown Financial Statements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                                                                                                                       --
Tom Brown SEC Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                                                                                                                       --
Tom Brown Trading Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
                                                                                                                       --
US Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
                                                                                                                        -
Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
                                                                                                                        -
WI  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
</TABLE>





                                     -vii-
<PAGE>   42
                               LIST OF SCHEDULES

<TABLE>
<CAPTION>
                                                                                                                     PAGE
                                                                                                                     ----
<S>                                                                                                                    <C>
Schedule 5.25.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
                                                                                                                        -
Schedule 4.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
                                                                                                                        -
Schedule 4.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
                                                                                                                       --
Schedule 4.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                                                                                                                       --
Schedule 4.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                                                       --
Schedule 4.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                                                       --
Schedule 4.26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                                                       --
Schedule 5.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                                                                                                                       --
Schedule 5.12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
                                                                                                                       --
Schedule 5.5  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
Schedule 5.5  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
                                                                                                                       --
Schedule 5.8  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
                                                                                                                       --
Schedule 5.8  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
                                                                                                                       --
Schedule 5.9  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
                                                                                                                       --
Schedule 5.9  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
Schedule 5.11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
Schedule 5.11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                                                       --
Schedule 5.11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
Schedule 5.12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
Schedule 5.13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
                                                                                                                       --
Schedule 5.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                                                                                                                       --
Schedule 5.16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
                                                                                                                       --
Schedule 5.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
Schedule 5.19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
Schedule 5.20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
                                                                                                                       --
Schedule 5.21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
                                                                                                                       --
Schedule 5.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
Schedule 5.23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
Schedule 5.24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
Schedule 5.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
                                                                                                                       --
Schedule 5.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
                                                                                                                       --
Schedule 5.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
                                                                                                                       --
Schedule 5.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
                                                                                                                       --
Schedule 5.25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
                                                                                                                       --
Schedule 6.7  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
Schedule 6.7  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
Schedule 6.7  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
Schedule 6.8  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
                                                                                                                       --
</TABLE>





                                     -viii-
<PAGE>   43
                               EXCHANGE AGREEMENT


         This Exchange Agreement dated August 5, 1996, is entered into by and
among Presidio Oil Company, a Delaware corporation, Presidio Exploration, Inc.,
a Colorado corporation, Presidio West Virginia, Inc., a Delaware corporation,
Palisade Oil, Inc., a Colorado corporation, and Tom Brown, Inc., a Delaware
corporation.

                                   RECITALS:

         A.      The boards of directors of Presidio and Tom Brown have each
determined that it is in the best interests of their respective constituencies
for Tom Brown to acquire Presidio upon the terms and subject to the conditions
set forth in this Agreement.

         B.      Presidio and Tom Brown desire to make certain representations,
warranties, covenants, and agreements in connection with such acquisition and
also to prescribe various conditions to such acquisition.

         Now, therefore, for and in consideration of the mutual covenants and
agreements set forth in this Agreement and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
the parties to this Agreement hereby agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

         1.1     Defined Terms.  The following terms, as used herein, have the
following meanings:

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

         "1934 Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations thereunder.

         "Acreage" means the Leases set forth on Appendix A-1 to Exhibit A
attached hereto.

         "Affiliate" of a person means any person which, directly or
indirectly, controls, is controlled by, or is under common control with, such
person.  The term "control" including, with correlative meaning, the terms
"controlled by" and "under common control with" as used with respect to any
person, means the possession, directly or indirectly, of the power to direct or
cause the direction of the management and policies of such person, whether
through the ownership of voting securities, by contract or otherwise.





                                      -1-
<PAGE>   44
         "Aggregate Common Share Value" means a dollar amount equal to the
difference between the Aggregate Consideration and the Cash Consideration, as
adjusted pursuant to Section 5.09 of the Plan of Reorganization.

         "Aggregate Consideration" means $183,000,000 except as such may be
adjusted pursuant to Section 5.09 of the Plan of Reorganization.

         "Agreement" means this Exchange Agreement and all Schedules and
Exhibits attached hereto.

         "Allocated Value" means (a) the net present value allocated to the
interest of the Presidio Parties in and to each Oil and Gas Asset that is
separately valued on the Reserve Report or (b) the amounts set forth on
Appendix A-1 to Exhibit A in respect of the Leases comprising the Acreage.

         "Alternative Transaction" has the meaning set forth in Section
4.20(a).

         "Bank Obligations" means the obligations of Presidio and its
Affiliates pursuant to the Amendment and Restatement of Amendment, Restatement
and Consolidation of Credit Agreement dated August 6, 1993, as amended, between
Presidio, Presidio Exploration, each bank which is a signatory thereto or
successor or assign thereof and The Chase Manhattan Bank, N.A., as agent.

         "Bankruptcy Code" means Title 11 of the United States Code, as amended
from time to time.

         "Bankruptcy Court" means the Bankruptcy Court presiding over the
Presidio Parties' Chapter 11 cases.

         "Bankruptcy Event" has the meaning set forth in Section 4.5(a).

         "Bar Date Order" has the meaning set forth in Section 4.5(d).

         "Cash Consideration" means a cash payment in an amount equal to the
sum of (a) the Presidio Common Stock Cash Consideration, plus (b) the excess of
(i) the sum of (x) $100,193,267, plus (y) the amount of accrued and unpaid
interest on the Bank Obligations allowed by an order of the Bankruptcy Court,
over (ii) all amounts, if any, paid by a Presidio Party in respect of the Bank
Obligations (other than interest paid in respect thereof) or the Senior Secured
Notes from the date of this Agreement through and including the Closing.

         "CERCLA" means the Comprehensive Environmental Response, Compensation
and Liability Act of 1980, as amended.

         "CERCLIS" means the Comprehensive Environmental Response, Compensation
and Liability Information System List.

         "Closing" has the meaning set forth in Section 3.1(a).





                                      -2-
<PAGE>   45
         "Closing Date" has the meaning set forth in Section 3.1(b).

         "Code" means the Internal Revenue Code of 1986, as amended from time
to time.

         "Common Share Value" means a value per share of Tom Brown Common Stock
equal to $16.50, as adjusted pursuant to Section 3.2.

         "Confidentiality Agreement" means that certain letter agreement dated
August 15, 1995 between Tom Brown and Presidio, as amended by letters dated
October 30, 1995 and November 10, 1995 and as such may be hereafter amended.

         "Confirmation Date" means the date upon which the Confirmation Order
is entered.

         "Confirmation Order" means the order of the Bankruptcy Court
confirming the Plan of Reorganization pursuant to Sections 1129 and 1141 of the
Bankruptcy Code.

         "Contract" has the meaning set forth in Section 5.4.

         "Debt Obligations" means the obligations of Presidio pursuant to the
following:

                 (a)      Indenture dated as of August 6, 1993 among Presidio,
         various of its subsidiaries and U.S. Trust Company of New York ("US
         Trust") relating to $75,000,000 original aggregate principal amount of
         11.5% Senior Secured Notes due 2000 (the "Senior Secured Notes");

                 (b)      Indenture dated as of August 6, 1993 among Presidio,
         various of its subsidiaries and US Trust relating to $100,000,000
         original aggregate principal amount of Senior Gas Indexed Notes due
         2002 (the "Senior Gas Indexed Notes");

                 (c)      Indenture dated as of February 16, 1989 among
         Presidio, various of its subsidiaries and US Trust, as amended,
         relating to $100,000,000 original aggregate principal amount of Senior
         Subordinated Gas Indexed Notes due 1999 (the "Subordinated Gas Indexed
         Notes"); and

                 (d)      Indenture dated as of February 14, 1990 among
         Presidio and Bank of Montreal Trust Company relating to $50,000,000
         original aggregate principal amount of 9% Convertible Subordinated
         Debentures Due 2015.

         "Defensible Title" with respect to the Major Assets means that title
of a Presidio Party which, subject to Permitted Encumbrances:

                 (a)      is deducible of record (either from the records of
         the applicable county clerk and recorder or, in the case of federal
         leases, from the records of the applicable office of the Bureau of
         Land Management, or in the case of Indian leases, from the applicable
         offices of the Bureau of Indian Affairs, or in the case of state
         leases, from





                                      -3-
<PAGE>   46
         the records of the applicable state land office, or from some
         combination of the foregoing official records), and is free from
         reasonable doubt such that a prudent person with knowledge of all the
         facts and their legal bearing would be willing to accept the same;

                 (b)      entitles a Presidio Party to receive not less than
         the net revenue interest (indicated by the letters "NRI") set forth in
         Exhibit B attached hereto of all oil, gas and associated liquid and
         gaseous hydrocarbons produced, saved and marketed from each of the
         Major Assets throughout the life of such Major Asset, provided, that
         the provisions of this clause (b) shall not be applicable to the
         Leases comprising the Acreage;

                 (c)      obligates a Presidio Party to bear costs and expenses
         relating to the maintenance, development, and operation of each of the
         Major Assets in an amount not greater than the working interest
         (indicated by the letters "WI") set forth in Exhibit B attached hereto
         throughout the life of such Major Asset except to the extent such
         increase in working interest is accompanied by a proportionate
         increase in the net revenue interest attributable to such Major Asset,
         provided, that the provisions of this clause (c) shall not be
         applicable to the Leases comprising the Acreage; and

                 (d)      is free and clear of Liens.

         "Designated Contracts" shall mean each of the operating agreements set
forth on Schedule 5.25.

         "Directors and Officers"shall have the meaning given such terms in the
New D&O Insurance.

         "Disclosure Statement" means the disclosure statement in the form
attached hereto as Exhibit D as such may be amended or supplemented after the
date of this Agreement, together with such other solicitation materials that
may be jointly prepared by the Plan Proponents and filed by Presidio pursuant
to Section 1125 of the Bankruptcy Code in connection with the Plan of
Reorganization.

         "Distributee" means a person who is a holder of Bank Obligations, Debt
Obligations or Presidio Common Stock.

         "Employee Benefit Plans" has the meaning set forth in Section 5.9(a).

         "Environmental Laws" means any and all applicable laws (including, but
not limited to, CERCLA and corresponding state or local acts), statutes,
ordinances, rules, regulations, policies, guidelines, consents, approvals,
licenses, judgments, memoranda of understanding, orders, judicial decrees, or
administrative decrees, treaties, permit conditions, or injunctions of any
Governmental Authority or court of competent jurisdiction pertaining to the
protection of the environment.





                                      -4-
<PAGE>   47
         "Environmental Material" means (a) any hazardous substance, as defined
by CERCLA, (b) any "hazardous waste," as defined by the Resource Conservation
and Recovery Act, as amended through the date of this Agreement, (c) any
hazardous, dangerous, or toxic chemical, material, waste, or substance, within
the meaning of and regulated by any Environmental Law, (d) any material
emitting radiation in excess of ordinary background conditions, including any
naturally occurring radioactive material, and any source, special, or byproduct
material as defined in 42 U.S.C. Section 2011 et seq. and any amendments or
authorizations thereof, (e) any asbestos-containing materials in any form or
condition, or (f) any polychlorinated biphenyls in any form or condition.

         "Environmental Response Action" means any remedial action, removal
action, remedial investigation and feasibility study, site characterization,
Natural Resource Damage Matters, Brownfield Agreements, or other investigations
whatsoever relating to the presence or suspected presence of Environmental
Materials on or originating from operations of Presidio.  The term
Environmental Response Action shall not include customary well plugging,
abandonment, and drill site restoration requirements.

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time.

         "ESOP" has the meaning set forth in Section 4.23.

         "Exchange" means the transactions contemplated in Section 2.1.

         "Exchange Agent" means a person appointed by Tom Brown and Presidio to
serve as Exchange Agent hereunder or absent such appointment a person appointed
pursuant to the Plan of Reorganization.

         "Exchange Common Stock" means a number of shares of Tom Brown Common
Stock (or other securities as may be required under Section 3.2) obtained by
dividing (a) the Aggregate Common Share Value by (b) the Common Share Value,
less the number of shares of Tom Brown Common Stock to which Tom Brown
otherwise would have been entitled pursuant to Section 2.1 in respect of its
ownership of Senior Gas Indexed Notes or any other Presidio Securities it may
acquire hereafter.  As of the date of this Agreement, the Exchange Common Stock
is initially established hereunder at 5,003,438 shares of Tom Brown Common
Stock (with such number of shares being calculated without any reduction
thereof in respect of the shares of Tom Brown Common Stock to which Tom Brown
otherwise would be entitled to receive in respect of its ownership of Senior
Gas Indexed Notes).

         "Exchange Consideration" means the Cash Consideration and the Exchange
Common Stock and shall also include the net proceeds received from the sale of
fractional shares of Exchange Common Stock pursuant to Section 2.7.

         "Existing Plans" means the Employee Benefit Plans and the Severance
Plan and Agreements.





                                      -5-
<PAGE>   48
         "Final Order" means an order or judgment of the Bankruptcy Court which
shall not have been reversed, stayed, modified, or amended and as to which (a)
the time to appeal from or to seek review, rehearing or certiorari shall have
expired and (b) no appeal or petition for review, rehearing, or certiorari is
pending or if appealed shall have been affirmed, or the appeal dismissed by the
highest court to which such order was appealed, or if review, rehearing or
certiorari was sought, such review, rehearing, or certiorari has been denied
and no further hearing, appeal or petition for review, rehearing, or certiorari
can be taken or granted or as to which any right to appeal or to seek a review,
rehearing, or certiorari has been waived.

         "401k Plan" has the meaning set forth in Section 4.24.

         "GAAP" means those generally accepted accounting principles and
practices that are recognized as such by the Financial Accounting Standards
Board (or any generally recognized successor).

         "Governmental Authority" means any federal, state, local, foreign
government, or political subdivision thereof, exercising competent
jurisdiction.

         "Hart Scott Act" has the meaning set forth in Section 4.9.

         "Initial Order" has the meaning set forth in Section 4.5(c).

         "Knowledge" means actual knowledge as of the date of this Agreement of
each of the officers and employees named in Schedule 4.22 and for the purposes
of Section 5.21, the term Knowledge shall also include the actual knowledge as
of the date of this Agreement of Brant Gimmeson.

         "Leases" has the meaning set forth in the definition of Oil and Gas
Assets.

         "Liabilities" has the meaning set forth in Section 5.12.

         "Lien" means any mortgage, pledge, hypothecation, security interest,
encumbrance, charge or lien (statutory or otherwise) or assignment, deposit
arrangement or other preferential arrangement in respect of an interest in
property intended to secure, support or otherwise assure payment of an
obligation (including any conditional sale or other title retention agreement
and any lease having substantially the same economic effects as any of the
foregoing).

         "Major Assets" means (a) each Oil and Gas Asset that is separately
valued on the Reserve Report as having an Allocated Value individually in
excess of $50,000 and (b) the Acreage.

         "Material Contracts" has the meaning set forth in Section 5.25.

         "Merger" has the meaning set forth in Section 2.11.

         "NASDAQ" means the Nasdaq National Market of The Nasdaq Stock Market.





                                      -6-
<PAGE>   49
         "New D&O Insurance" has the meaning set forth in Section 4.15(a).

         "Oil and Gas Assets" means the following:

                 (a)      All right, title, and interest of the Presidio
         Parties in and to (i) all oil and gas leases, all oil, gas and mineral
         leases or other similar leases, mineral interests, fee estates,
         production payments, net profits interests, carried interests,
         royalties, and overriding royalties and all lands subject thereto,
         whether producing or non-producing (the "Leases"), including the
         leases, mineral interests, overriding royalties and royalties set
         forth on Exhibit A attached hereto, and any other oil, gas or other
         mineral interests of any type of a Presidio Party wherever situated
         and including any and all right, title and interest of a Presidio
         Party in and to the oil, gas and other hydrocarbons in, on or under
         any of the foregoing, and (ii) all oil and gas wells and injection and
         disposal wells located on any of the foregoing, or used or useful in
         connection therewith, or on lands pooled or unitized therewith (the
         "Wells"), including the wells set forth on Exhibit B attached hereto;

                 (b)      All right, title, and interest of the Presidio
         Parties in, to and under or derived from all presently existing or
         proposed unitization, pooling and communitization agreements,
         declarations and orders, and the properties covered and the units
         created or to be created thereby (including all units formed or to be
         formed under orders, regulations, rules or other official actions of
         any federal, state or other governmental agency having jurisdiction)
         to the extent that they relate to or affect the Leases or the Wells;

                 (c)      All right, title, and interest of the Presidio
         Parties in, to and under or derived from all presently existing and
         effective oil, gas liquids, condensate, casinghead gas and gas sales,
         purchase, marketing, exchange, gathering, transportation and
         processing contracts, operating agreements, farmout agreements,
         exploration agreements, option agreements, joint venture agreements,
         partnership agreements, settlement agreements and all other agreements
         and instruments to the extent that they relate to the Leases or the
         Wells;

                 (d)      All right, title, and interest of the Presidio
         Parties in or to all personal property, fixtures, equipment,
         improvements and other personal property, whether real, personal or
         mixed (including well equipment, casing, tubing, tanks, pumping units,
         rods, tank batteries, natural gas, crude oil, condensate or products
         placed into storage or into pipelines, buildings, pumps, motors,
         machinery, injection facilities, disposal facilities, field separators
         and liquid extractors, compressors, pipelines, gathering and flow
         lines, roads, field treating facilities, field offices and office
         furnishings related thereto, field office leases, storage yards and
         off-site inventories, equipment leases, vehicles, trailers, operating
         supplies, inventories and all other appurtenances thereunto
         belonging), and in and to all easements, permits, licenses,
         servitudes, rights-of-way, surface leases and other surface rights to
         the extent any of the foregoing is now being used or proposed to be
         used in connection with the exploration, development, operation or
         maintenance of the Leases or Wells or now being used or proposed to be
         used in connection with the producing, treating, processing, storing,
         gathering, transporting or marketing of oil and gas attributable to
         such properties or interests





                                      -7-
<PAGE>   50
         and other hydrocarbons and products in association therewith, and all
         contract rights (including rights under leases to third parties)
         related to any of the foregoing; and

                 (e)      All right, title, and interest of the Presidio
         Parties in and to all oil, gas, and other minerals owned by a Presidio
         Party or any interests credited to the account of a Presidio Party
         pursuant to any production imbalances or balancing agreements relating
         to any interests owned by a Presidio Party in the Leases or the Wells
         or otherwise arising by virtue of the fact that a Presidio Party may
         not have taken or marketed its full share of oil, gas or other
         minerals attributable to its ownership in the Leases or the Wells
         prior to the Closing Date.

         "Palisade Oil" means Palisade Oil, Inc., a Colorado corporation.

         "Permitted Claims" means any Liens, Liabilities, claims, or causes of
action arising from any defect adversely affecting a Presidio Party's title to
any Oil and Gas Asset, which defect arises from or is attributable to any
facts, events, or circumstances in existence on or before June 19, 1996.  The
term Permitted Claims shall also include all Title Defects in existence on or
before June 19, 1996.

         "Permitted Encumbrances" means:

                 (a)      Lessors' royalties, overriding royalties,
         reversionary interests and similar burdens as of the date of this
         Agreement to the extent that (i) they burden the Leases comprising the
         Acreage, or (ii) they do not prevent the Presidio Parties from
         receiving the proceeds of production from each of the Major Assets
         attributable to the net revenue interests reflected in Exhibit B;

                 (b)      preferential rights to purchase;

                 (c)      Third Party Consents with respect to which on or
         before the Closing a waiver, consent or a judicial order or
         determination is obtained as contemplated in Section 4.11;

                 (d)      Liens for Taxes not yet delinquent or, if delinquent,
         that are being contested in good faith in the normal course of
         business;

                 (e)      Materialman's, mechanic's, repairman's, employee's,
         contractor's, operator's, and other similar Liens or charges arising
         in the ordinary course of business (i) if they have not been filed
         pursuant to law, (ii) if so filed, they have not yet become due and
         payable or payment is being withheld as provided by law, or (iii) if
         their validity is being contested in good faith by appropriate action;

                 (f)      All rights to consent by, required notices to,
         filings with, or other actions by Governmental Authorities in
         connection with the sale or conveyance of oil and





                                      -8-
<PAGE>   51
         gas leases or interests therein if they are customarily obtained
         subsequent to the sale or conveyance;

                 (g)      Conventional rights of reassignment upon the
         surrender or expiration of any Lease;

                 (h)      Easements, rights-of-way, servitudes, permits,
         surface leases, and other rights in respect of surface operations;

                 (i)      All other Liens, charges, contracts, agreements, 
         instruments, obligations, defects, and irregularities affecting
         the Leases or Wells which taken individually or together (i) do not
         interfere materially with the operation, value or use of any of the Oil
         and Gas Assets, (ii) do not prevent a Presidio Party from receiving the
         proceeds of production from any of the Major Assets attributable to the
         net revenue interests reflected in Exhibit B or the ownership interests
         of the Presidio Parties in the Acreage, as may be applicable, (iii) do
         not adversely affect the net revenue interest of a Presidio Party as
         reflected in Exhibit B or the ownership interests of the Presidio
         Parties in the Acreage, as may be applicable, with respect to its share
         of the oil and gas produced from any such Major Asset, or (iv) do not
         increase the portion of the costs and expenses that a Presidio Party is
         obligated to pay above the working interests reflected in Exhibit B or
         the ownership interests of the Presidio Parties in the Acreage, as may
         be applicable; such Liens, charges, contracts, agreements, instruments,
         obligations, defects, and irregularities include the following:
        
                          (A)     those created by the terms and conditions of
                 division orders, sales contracts, and other existing contracts
                 burdening the Oil and Gas Assets, including any and all terms
                 and conditions affecting or relating to production imbalances;

                          (B)     those which have not prevented the receipt of
                 production proceeds by a Presidio Party or its predecessors in
                 title without suspense by a production purchaser and as to
                 which no challenge to title has been raised on the basis of
                 such defect, so long as it can reasonably be concluded either
                 that such challenge is highly unlikely or that such challenge
                 would be unsuccessful by reason of statutes of limitation,
                 waiver, estoppel, or other defenses;

                          (C)     those described by an attorney's title
                 opinion as advisory or waivable as a matter of business
                 judgment; or

                          (D)     those in the nature of customary defects
                 expected to be encountered in the area involved and
                 customarily acceptable to prudent operators and interest
                 owners in that area, including defects that have been cured by
                 possession under applicable statutes of limitation, defects in
                 the early chain of title such as failure to recite marital
                 status in documents, omission of heirship or succession
                 proceedings, lack of survey and failure to record releases of
                 liens, production payments, or mortgages that have expired of
                 their own terms or which through the





                                      -9-
<PAGE>   52
                 passage of time or statute are no longer enforceable or other
                 defects that either as a practical matter have not resulted or
                 are not likely to result in a material claim or are considered
                 waivable under local bar association-approved title standards
                 or customary title practices in the area;

                 (j)      All rights reserved to or vested in any Governmental
         Authority to control or regulate any of the Leases or Wells in any
         manner, and all applicable laws, rules, and orders of governmental
         authorities;

                 (k)      Any Title Defects, Liens or other defects affecting
         the Oil and Gas Assets which are to be discharged at or prior to
         Closing pursuant to the Plan of Reorganization;

                 (l)      Permitted Claims; and

                 (m)      The Liens securing the Bank Obligations and certain
         Debt Obligations which are discharged at or prior to Closing pursuant
         to the Plan of Reorganization.

         "person" means an individual, a corporation, a partnership, an
association, a trust, an estate or other entity or organization, including a
government or political subdivision or an agency or instrumentality thereof.

         "Plan Documents" means all documents and exhibits that aid in
effecting the Plan of Reorganization.

         "Plan of Reorganization" means the plan of reorganization in the form
attached hereto as Exhibit C as such may be amended after the date of this
Agreement, which is to be proposed by the Plan Proponents and filed by the
Presidio Parties in accordance with the Bankruptcy Code as a part of the
Reorganization Cases of the Presidio Parties and which upon confirmation
implements the transactions contemplated by this Agreement.

         "Plan Proponents" means the Presidio Parties and Tom Brown as the
joint plan proponents of the Plan of Reorganization.

         "Presidio" means Presidio Oil Company, a Delaware corporation.

         "Presidio Class A Common Stock" means the Class A Common Stock of
Presidio, par value $.10 per share.

         "Presidio Class B Common Stock" means the Class B Common Stock of
Presidio, par value $.10 per share.

         "Presidio Common Stock" means the Presidio Class A Common Stock and
the Presidio Class B Common Stock.





                                      -10-
<PAGE>   53
         "Presidio Common Stock Cash Consideration" means a cash payment to be
made pursuant to the Plan of Reorganization in an amount of $250,000 to the
holders of the Presidio Common Stock, as adjusted pursuant to Section 5.09 of
the Plan of Reorganization.

         "Presidio Exploration" means Presidio Exploration, Inc., a Colorado
corporation.

         "Presidio Financial Statements" means the audited and unaudited
consolidated financial statements of Presidio and its consolidated subsidiaries
(including the related notes) included (or incorporated by reference) in
Presidio's Annual Report on Form 10-K for the year ended December 31, 1995.

         "Presidio Options or Warrants" has the meaning set forth in Section
5.11(b).

         "Presidio Parties" means Presidio, Presidio Exploration, Presidio West
Virginia, and Palisade Oil.

         "Presidio Representative" means any director, officer, employee,
agent, advisor (including legal, accounting, and financial advisors), or other
representative of a Presidio Party.

         "Presidio SEC Documents" means each report, schedule, registration
statement and definitive proxy statement filed by Presidio with the SEC since
January 1, 1995 and prior to the date of this Agreement.

         "Presidio Security" means the Presidio Common Stock, the promissory
notes evidencing the Bank Obligations, the Debt Obligations and the Presidio
Options or Warrants.

         "Presidio Securityholders" has the meaning set forth in Section
4.6(a).

         "Presidio Tax Affiliates" has the meaning set forth in Section 5.8(a).

         "Presidio West Virginia" means Presidio West Virginia, Inc., a
Delaware corporation.

         "Released Claims" has the meaning set forth in Section 8.2(i).

         "Releasing Parties" has the meaning set forth in Section 8.2(i).

         "Reorganization Cases" has the meaning set forth in Section 4.5(a).

         "Reserve Report" means the engineering report prepared by Presidio
based on an SEC Case as of December 31, 1995 and reviewed by Huddleston & Co.,
Inc. on behalf of Presidio concerning certain of the Oil and Gas Assets.

         "Schedule and Exhibit Volume" means the volume containing the
Schedules and Exhibits A and B to this Agreement to which has been attached a
cover page executed by the parties hereto for identification with this
Agreement.





                                      -11-
<PAGE>   54
         "SEC" means the Securities and Exchange Commission.

         "SEC Case" means the present value of estimated future net revenues
from oil and gas properties discounted at ten percent (10%) before taxes and
determined in all material respects in accordance with the rules and
regulations of the SEC using prices and costs in effect on the valuation date.

         "Senior Gas Indexed Notes" has the meaning set forth in the definition
of Debt Obligations.

         "Senior Secured Notes" has the meaning set forth in the definition of
Debt Obligations.

         "Severance Plan and Agreements" has the meaning set forth in Section
4.22.

         "Subordinated Gas Indexed Notes" has the meaning set forth in the
definition of Debt Obligations.

         "Tax Returns" means all federal and all material state, local, and
foreign returns, claims for refund, declarations, reports, estimates,
information returns and statements required to be filed with respect to any
Taxes.

         "Taxes" means taxes of any kind, levies, or other like assessments,
customs, duties, imposts, charges, or fees, including income, gross receipts,
ad valorem, value added, excise, stamp, environmental (including taxes under
Code Section 59A), alternative or add-on minimum, real or personal property,
asset, sales, use, license, payroll, transaction, capital, net worth and
franchise taxes, estimated taxes, withholding, employment, social security,
workers compensation, utility, severance, production, unemployment
compensation, occupation, premium, windfall profits, transfer and gains taxes,
or other governmental taxes imposed or payable to the United States or any
state, local, or foreign governmental subdivision or agency thereof, and in
each instance such term shall include any interest, penalties, or additions to
tax attributable to any such Tax, including penalties for the failure to file
any Tax Return or report.

         "Termination Expenses" has the meaning set forth in Section 9.2(b).

         "Termination Fee" has the meaning set forth in Section 9.2(a).

         "Third Party Consent" has the meaning set forth in Section 4.11.

         "Title Defects" means any defect adversely affecting any Major Asset
which causes a Presidio Party not to have Defensible Title to such Major Asset.

         "Tom Brown" means Tom Brown, Inc., a Delaware corporation.

         "Tom Brown Common Stock" means the common stock of Tom Brown, par
value $.10 per share.





                                      -12-
<PAGE>   55
         "Tom Brown Financial Statements" means the audited and unaudited
consolidated financial statements of Tom Brown and its consolidated
subsidiaries (including the related notes) included (or incorporated by
reference) in Tom Brown's Annual Report on Form 10-K for the year ended
December 31, 1995.

         "Tom Brown SEC Documents" means each report, schedule, registration
statement, and definitive proxy statement filed by Tom Brown with the SEC since
January 1, 1995 and prior to the date of this Agreement.

         "Tom Brown Trading Value" means the average of the closing sales
prices of the Tom Brown Common Stock on the NASDAQ (as reported by The Wall
Street Journal or, if not reported thereby, by another authoritative source)
over the twenty (20) trading days immediately preceding the date that is five
trading days prior to the Confirmation Date.

         "Wells" has the meaning set forth in the definition of Oil and Gas
Assets.

         1.2     References and Titles.  All references in this Agreement to
Exhibits, Schedules, Articles, Sections, subsections, and other subdivisions
refer to the corresponding Exhibits, Schedules, Articles, Sections,
subsections, and other subdivisions of this Agreement unless expressly provided
otherwise.  Each of the Schedules referenced in this Agreement together with
Exhibits A and B are contained in the Schedule Volume.  Titles appearing at the
beginning of any Articles, Sections, subsections, or other subdivisions of this
Agreement are for convenience only, do not constitute any part of such
Articles, Sections, subsections, or other subdivisions, and shall be
disregarded in construing the language contained therein.  The words "this
Agreement," "herein," "hereby," "hereunder," and "hereof," and words of similar
import, refer to this Agreement as a whole and not to any particular
subdivision unless expressly so limited.  The words "this Section" and "this
subsection," and words of similar import, refer only to the Sections or
subsections hereof in which such words occur.  The word "or" is not exclusive,
and the word "including" (in its various forms) means "including without
limitation."  Pronouns in masculine, feminine, or neuter genders shall be
construed to state and include any other gender, and words, terms, and titles
(including terms defined herein) in the singular form shall be construed to
include the plural and vice versa, unless the context otherwise expressly
requires.

                                   ARTICLE II

                                  THE EXCHANGE

         2.1     Exchange.  Pursuant to this Agreement and the Plan of
Reorganization as confirmed by the Bankruptcy Court, on the Closing Date,
except to the extent already owned by Tom Brown or cancelled pursuant to the
Plan of Reorganization, all of (a) the Bank Obligations, (b) the Debt
Obligations and (c) the Presidio Common Stock shall be transferred absolutely
and unconditionally to Tom Brown in exchange for that portion and amount of the
Exchange Consideration (if any) allocated to the existing holders of such
claims and interests pursuant to the Plan of Reorganization.  No Exchange
Consideration shall be issued or paid to Tom Brown in respect of its ownership
of (i) Senior Gas Indexed Notes or (ii) any other Presidio Securities which it
may acquire hereafter to





                                      -13-
<PAGE>   56
the extent it would be entitled to receive Exchange Common Stock in exchange
therefor.  Upon delivery of the Exchange Consideration to the Exchange Agent as
provided in Section 2.4 hereof, Tom Brown shall be deemed the sole equity
holder, and the sole holder of the Bank Obligations and Debt Obligations of
Presidio, and Presidio's obligations to the holders of the (a) Bank
Obligations, (b) the Debt Obligations and (c) the Presidio Common Stock under
the Plan of Reorganization shall be deemed to be satisfied in full and
discharged.  As of the Closing Date, the Presidio Options and Warrants shall be
cancelled pursuant to the Plan of Reorganization.  Tom Brown, as the sole
equity owner of Presidio, shall, immediately following the Exchange described
in this Section 2.1, contribute to Presidio all of the Bank Obligations and
Debt Obligations.  No additional shares of Presidio capital stock shall be
issued to Tom Brown in exchange therefor.  The Bank Obligations and Debt
Obligations shall thereupon be cancelled, terminated, and discharged.

         2.2     Directors and Officers of the Presidio Parties.  The directors
and officers of each of the Presidio Parties shall resign as of the Closing.

         2.3     Exchange Consideration.  At the Closing, Tom Brown shall pay
or issue (in accordance with Section 2.4 hereof) the Exchange Consideration.

         2.4     Exchange Fund.  At the Closing, Tom Brown shall deposit with
the Exchange Agent, for the benefit of each of the Distributees, the Exchange
Consideration including certificates representing the Exchange Common Stock.
The Cash Consideration shall be tendered and paid to the Exchange Agent in
immediately available funds.  The Exchange Agent will distribute to the
Distributees the Exchange Consideration (together with any interest earned
thereon) in accordance with the Plan of Reorganization.  The Exchange Agent
shall receive and hold all dividends or other distributions paid or distributed
with respect to the Exchange Common Stock held by it for the account of the
Distributees entitled thereto.

         2.5     Tom Brown Distributions.  A Distributee shall be entitled to
receive dividends and other distributions with respect to the Exchange Common
Stock to which such Distributee is entitled pursuant to the Plan of
Reorganization.

         2.6     No Further Ownership Rights in Presidio Securities.  Except
for the contribution to be made by Tom Brown pursuant to Section 2.1, if, after
the Closing, a certificate representing a Presidio Security registered in the
name of a Distributee (other than Tom Brown) is presented to Presidio or the
Exchange Agent for any reason, it shall be cancelled and exchanged for that
portion and amount, if any, of the Exchange Consideration allocated thereto
pursuant to the Plan of Reorganization.

         2.7     No Fractional Shares.  No fractional shares of the Exchange
Common Stock shall be issued to a Distributee.  The Exchange Agent shall, on
behalf of all Distributees otherwise entitled to receive fractional shares of
Exchange Common Stock, promptly following the Closing, aggregate such
fractional shares of Exchange Common Stock and sell the resulting whole shares
of Exchange Common Stock for the account of such Distributees, and such
Distributees shall be entitled to receive their allocable portion of the net
proceeds of the sale thereof.





                                      -14-
<PAGE>   57
         2.8     Termination of Exchange Fund.  Any portion of the Exchange
Consideration held by the Exchange Agent that is not distributed pursuant to
the Plan of Reorganization within ninety (90) days after the Closing shall,
upon Presidio's request, be delivered to Tom Brown.  Thereafter, a Distributee
shall look only to Presidio for distribution of that portion and amount of the
Exchange Consideration (including any dividends or distributions made in
respect of Exchange Common Stock) that such Distributee is entitled to receive
pursuant to the Plan of Reorganization.  Such amounts shall bear no interest.

         2.9     No Liability.  None of Presidio, Tom Brown, the Exchange
Agent, or any other person shall be liable to any Distributee for any amount
properly delivered to any public official pursuant to any applicable abandoned
property, escheat, or similar law.  Any amounts remaining unclaimed by a
Distributee for a period of two years following the Closing (or such earlier
date immediately prior to the time at which such amounts would otherwise
escheat to or become the property of any governmental entity) shall, to the
extent permitted by applicable law, become the property of Tom Brown free and
clear of any claims or interest of any such Distributee or his successors,
assigns, or personal representative previously entitled thereto.

         2.10    Lost, Stolen, or Destroyed Certificates.  If any certificate
representing a Presidio Security shall have been lost, stolen, or destroyed,
upon the making of an affidavit of that fact by the Distributee claiming such
certificate to be lost, stolen, or destroyed and, if required by Tom Brown, the
issuance by such Distributee of such reasonable indemnity as Tom Brown may
require against any claim that may be made against it with respect to such
certificate, the Exchange Agent or Tom Brown, as applicable, shall issue in
exchange for such lost, stolen, or destroyed certificate that portion and
amount of the Exchange Consideration allocated to such Presidio Security in
accordance with the Plan of Reorganization.

         2.11    Merger Alternative.  If Tom Brown shall determine that the
transaction described in this Article II will not have the legal effects
described in the third sentence of Section 2.1, then the Exchange shall be
recast as a merger to be effected under the laws of the State of Delaware (the
"Merger"), pursuant to which a subsidiary of Tom Brown shall be merged with and
into Presidio, with Presidio to be the surviving corporation and a wholly-owned
subsidiary of Tom Brown.  In such event, this Agreement shall constitute an
Agreement and Plan of Merger and the parties shall prepare and file all such
documents (including any Certificate of Merger) necessary to effect the Merger.


                                  ARTICLE III

                        CLOSING AND PRE-CLOSING ACTIONS

         3.1     Time and Place of Closing.

                 (a)      Consummation of the Exchange as contemplated by this
         Agreement (the "Closing"), shall, unless otherwise agreed to in
         writing by Tom Brown and Presidio, take place at the offices of
         Andrews & Kurth L.L.P., located at 425 Lexington Avenue, New York, New
         York 10017 at 10:00 a.m., New York City time, on the fifth business
         day





                                      -15-
<PAGE>   58
         following the date that the conditions specified in Article VIII have 
         been satisfied, unless another time, date and place is agreed to by 
         the parties.

                 (b)      The date on which the Closing occurs is herein
         referred to as the "Closing Date".

         3.2     Adjustment to Common Share Value.  If at any time or from time
to time after the date of this Agreement and on or before the Closing Date, Tom
Brown shall (a) pay a dividend in Tom Brown Common Stock or make a distribution
in Tom Brown Common Stock (or in securities convertible into Tom Brown Common
Stock), (b) subdivide the outstanding Tom Brown Common Stock, (c) combine the
outstanding Tom Brown Common Stock into a smaller number of shares of Tom Brown
Common Stock, or (d) issue any shares of its capital stock or other securities
by reclassification of the Tom Brown Common Stock, then the Common Share Value
(or if necessary the securities comprising the Exchange Common Stock) in effect
at the time of the record date for such dividend or distribution or as of the
effective date of such subdivision, combination, or reclassification shall be
proportionately adjusted so that the aggregate number and kind of shares of
Exchange Common Stock shall be the aggregate number and kind of shares of Tom
Brown Common Stock or other securities of Tom Brown which, if the Exchange
Common Stock had been outstanding immediately prior to such time, the Exchange
Common Stock would represent by virtue of such dividend, distribution,
subdivision, combination or reclassification.

                                   ARTICLE IV

                                   COVENANTS

         4.1     Access to Assets, Personnel, and Information.  From the date
of this Agreement until the Closing, Presidio shall afford to Tom Brown and its
representatives, at Tom Brown's sole risk and expense, full access to any of
the assets, books, records (including files, Tax Returns, and accountants'
workpapers), contracts, employees, representatives, and agents (including
attorneys, accountants, and independent engineers) and facilities (including
office facilities) of the Presidio Parties, during normal business hours and
provided that such access does not unreasonably interfere with the ongoing
business or operations of any of the Presidio Parties.  Presidio shall upon
request furnish promptly to Tom Brown (at Tom Brown's expense) a copy of any
file, book, record, contract, or other written information concerning a
Presidio Party (or any of their respective assets) that is within the
possession or control of a Presidio Party.  During such period, Presidio will
make available to a reasonable number of Tom Brown representatives adequate
office space and facilities at the principal office facility of Presidio in
Denver, Colorado.

         4.2     Confidentiality Obligations.  Notwithstanding anything in this
Article IV to the contrary, Presidio shall not be obligated under the terms of
this Article IV to disclose to Tom Brown or its representatives, or grant Tom
Brown or its representatives access to, information that is within Presidio's
possession or control but subject to a valid and binding confidentiality
agreement with a third party without first obtaining the consent of such third
party, and Presidio, to the extent reasonably requested by Tom Brown, will use
its reasonable efforts to obtain any such consent.





                                      -16-
<PAGE>   59
          4.3      Indemnity Regarding Access.   Tom Brown agrees to indemnify,
defend, and hold harmless each Presidio Party, their respective directors,
officers, employees, agents, and representatives from and against any and all
claims, liabilities, losses, costs, and expenses (including court costs,
expenses of litigation and reasonable attorneys' fees) in connection with
personal injuries to personnel of Tom Brown or its representatives, including
death or property damage arising out of or relating to the access to the
business, property, and records afforded to Tom Brown.

         4.4     Tom Brown to Vote for Plan of Reorganization.  Tom Brown shall
vote, or shall cause to be voted, all Presidio Securities beneficially owned by
Tom Brown or any Affiliate thereof in favor of the Plan of Reorganization.

         4.5     Petition Under the Bankruptcy Code.

                 (a)      Each of the Presidio Parties (other than Presidio
West Virginia) shall, on or before August 1, 1996, commence their respective
Chapter 11 cases (together with Presidio West Virginia's pending Chapter 11
case, collectively, the "Reorganization Cases").  If prior to the voluntary
commencement of the Reorganization Cases by the Presidio Parties (other than
Presidio West Virginia) there should be commenced an involuntary case against
Presidio or Presidio Exploration, and such Presidio Party consents to the entry
of an order for relief in such involuntary case, then each of the Presidio
Parties that are not subject to the involuntary case shall promptly commence a
Reorganization Case.  Each of the foregoing voluntary filings or consents by
the Presidio Parties (other than Presidio West Virginia) is hereinafter
referred to as a "Bankruptcy Event".

                 (b)      Upon the occurrence of a Bankruptcy Event, the
Presidio Parties will file, or will cause to be filed, all pleadings, requests,
and other items and information required to be filed with the Bankruptcy Court
in a form reasonably acceptable to Tom Brown.  The Presidio Parties will use
their reasonable efforts to file the Plan of Reorganization and a Disclosure
Statement by no later than thirty (30) days following the occurrence of a
Bankruptcy Event.  The Presidio Parties hereto shall use their reasonable
efforts to cause the Bankruptcy Court to confirm the Plan of Reorganization and
approve the Disclosure Statement and approve, authorize, and order assumption
of this Agreement and all other agreements contemplated by, or related to, this
Agreement.

                 (c)      Not later than three (3) business days after the
occurrence of a Bankruptcy Event, Presidio shall file a motion in form and
substance reasonably acceptable to Tom Brown and seek a prompt hearing thereon
before the Bankruptcy Court for an order reasonably satisfactory in form and
substance to Tom Brown approving the provisions of Section 9.2 of this
Agreement (the "Initial Order").

                 (d)      Not later than three (3) business days after the
occurrence of a Bankruptcy Event, Presidio shall file a motion in form and
substance reasonably acceptable to Tom Brown and seek a prompt hearing thereon
before the Bankruptcy Court for an order establishing a claims bar date setting
the last date for filing prepetition claims and administration claims (in each
case, other than claims in respect of trade obligations for services,
materials, or goods incurred or arising in the ordinary course of business, the
Bank Obligations, the Debt Obligations, or the Presidio Securities),





                                      -17-
<PAGE>   60
including claims described in Section 510(b) of the Bankruptcy Code, which date
shall not be less than twenty (20) days prior to the Confirmation Date (the
"Bar Date Order").

                 (e)      The parties acknowledge that Presidio West Virginia
currently has its Reorganization Case pending and that notwithstanding the
execution and delivery of this Agreement by Presidio West Virginia or any
provision contained herein to the contrary, this Agreement shall not be
effective as to Presidio West Virginia until such time as the Bankruptcy Court
shall have entered an order authorizing Presidio West Virginia to execute and
deliver this Agreement.  After the date of this Agreement, Presidio shall cause
Presidio West Virginia to promptly seek entry of an order of the Bankruptcy
Court in Presidio West Virginia's Reorganization Case approving Presidio West
Virginia's execution and delivery of this Agreement.

         4.6     Preparation of Disclosure Statement.

                 (a)      Prior to the date of this Agreement, the parties
         hereto have prepared the Disclosure Statement in a form necessary to
         obtain lawful and enforceable acceptances or rejections of the Plan of
         Reorganization from the appropriate impaired classes of creditors and
         equity securityholders (the "Presidio Securityholders") and to
         implement and to obtain a Final Order confirming the Plan of
         Reorganization and to cause the issuance and distribution of the
         Exchange Common Stock in accordance with the Plan of Reorganization to
         be effected in compliance with all applicable provisions of the
         Bankruptcy Code, the 1933 Act, the 1934 Act, and any other federal or
         state law relating to the transactions contemplated by this Agreement.

                 (b)      The solicitation of acceptances or rejections of the
         Plan of Reorganization shall be conducted in accordance with the
         requirements of Chapter 11 of the Bankruptcy Code (including Sections
         1125 and 1145 thereof), the attendant bankruptcy rules of practice,
         and those federal or state securities laws which are not preempted or
         rendered moot by the applicability of the Bankruptcy Code and
         attendant bankruptcy rules of practice.

                 (c)      The parties heretofore have furnished and will
         continue to furnish to each other such information with respect to
         themselves, their respective associates and Affiliates and their
         respective assets and businesses (including such separate financial
         information of or relating to each party hereto) as shall be required
         for the Disclosure Statement and all additional filings as required by
         the Bankruptcy Code, the 1933 Act, the 1934 Act, state securities
         laws, the rules and regulations under such laws, and the rules and
         regulations of any applicable securities exchanges.  All information
         that may be hereafter included in the Disclosure Statement and such
         additional filings, as applicable, relating to Tom Brown shall be
         approved by Tom Brown and all information that may be hereafter
         included in the Disclosure Statement and such additional filings, as
         applicable, relating to the Presidio Parties shall be approved by
         Presidio.





                                      -18-
<PAGE>   61
         4.7      Disclosure Statement.

                 (a)      Presidio hereby covenants and agrees with Tom Brown
         that the Disclosure Statement (at the time it is first mailed to the
         Presidio Securityholders and at the Closing) will not contain an
         untrue statement of a material fact or omit to state a material fact
         required to be stated therein or necessary in order to make the
         statements therein in light of the circumstances under which they are
         made, not misleading (provided, however, that this clause shall only
         apply to information contained in the Disclosure Statement that was
         supplied by Presidio specifically for inclusion therein).  If, at any
         time prior to the Closing, any event with respect to Presidio, or with
         respect to other information supplied by Presidio specifically for
         inclusion in the Disclosure Statement occurs and such event is
         required by the Bankruptcy Code to be described in an amendment or
         supplement to the Disclosure Statement, then Presidio shall promptly
         notify Tom Brown of such occurrence and the parties shall cooperate
         with each other in the preparation and filing and obtaining Bankruptcy
         Court approval of such amendment or supplement, and, after obtaining
         Bankruptcy Court approval thereof, its dissemination.

                 (b)      Tom Brown hereby covenants and agrees with Presidio
         that the Disclosure Statement (at the time it is first mailed to the
         Presidio Securityholders, and at the Closing) will not contain an
         untrue statement of a material fact or omit to state a material fact
         required to be stated therein or necessary in order to make the
         statements therein, in light of the circumstances under which they are
         made, not misleading (provided, however, that this clause shall only
         apply to information contained in the Disclosure Statement that was
         supplied by Tom Brown specifically for inclusion therein).  If, at any
         time prior to the Closing, any event with respect to Tom Brown, or
         with respect to other information supplied by Tom Brown specifically
         for inclusion in the Disclosure Statement occurs and such event is
         required by the Bankruptcy Code to be described in an amendment or
         supplement to the Disclosure Statement, then Tom Brown shall promptly
         notify Presidio of such occurrence and the parties shall cooperate
         with each other in the preparation and filing and obtaining Bankruptcy
         Court approval of such amendment or supplement, and, after obtaining
         Bankruptcy Court approval thereof, its dissemination.

                 (c)      No amendment or supplement to the Disclosure
         Statement will be filed or otherwise disseminated to the Presidio
         Securityholders without the approval of both Tom Brown and Presidio.

         4.8     Solicitation of Presidio Securityholders.  Presidio will use
its good faith efforts to cause to be solicited from the Presidio
Securityholders their acceptance of the Plan of Reorganization, and except as
the board of directors of Presidio may otherwise determine appropriate in order
to properly discharge its fiduciary duties, Presidio will recommend acceptance
of the Plan of Reorganization to the Presidio Securityholders; provided,
however, that no solicitation of the Presidio Securityholders with respect to
the Plan of Reorganization shall be made until:

                 (a)      The Bankruptcy Court has entered an order determining
         and finding that (i) the Disclosure Statement complies with the
         provisions of Section 1125 of the Bankruptcy





                                      -19-
<PAGE>   62
         Code, (ii) the solicitation of the Presidio Securityholders with
         respect to their approval of the Plan of Reorganization may be made by
         means of the Disclosure Statement pursuant to Section 1125 of the
         Bankruptcy Code, and (iii) each of Tom Brown and Presidio will be
         afforded the protection granted by Section 1125(e) of the Bankruptcy
         Code with respect to such solicitation; and

                 (b)      The written opinion of Presidio's investment bankers
         or financial advisors referred to in Section 5.18 shall have been
         reconfirmed and shall not have been withdrawn or revised in any
         material respect.

         4.9     Cooperation; Notification of Certain Changes.  The parties
hereto will cooperate and use their reasonable efforts to (a) obtain (and will
prepare all registrations, filings, applications, requests, and notices
required to obtain) all permits, approvals, and consents of governmental bodies
or third parties which may be necessary to consummate the transactions
contemplated by this Agreement, including but not limited to all filings
required under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended from time to time (the "Hart Scott Act"), and the rules and regulations
promulgated thereunder and (b) to cure existing title defects.  The parties
hereto will otherwise cooperate and provide each other with such assistance as
may reasonably be required to perform or satisfy all covenants and conditions
required to be performed or satisfied hereunder.  Each party will promptly
notify the other parties hereto of any event of which they obtain knowledge
which has or might reasonably be expected to have a material adverse effect on
their respective businesses or which, if known on the date of this Agreement,
would have been required to be disclosed pursuant to this Agreement.

         4.10    Listing Application.  On or before the date of filing of the
Disclosure Statement, Tom Brown will file a listing application with NASDAQ for
the approval of the listing thereon of the Exchange Common Stock.

         4.11    Third Party Consents.  Promptly after the commencement of a
case under the Bankruptcy Code as contemplated herein, Presidio will use its
reasonable efforts to obtain each Third Party Consent, or if not otherwise
obtained, to file, or cause to be filed, all pleadings, requests, and other
items and information required to be filed with, the Bankruptcy Court (to the
extent applicable), seeking to obtain a Final Order or determination from the
Bankruptcy Court establishing that such Third Party Consent is not applicable
to or necessary in connection with the transactions contemplated by this
Agreement.  As used in this Agreement, "Third Party Consent" means any
third-party consents relating to the Oil and Gas Assets that would be required
in respect of the transactions contemplated by this Agreement.

         4.12    Agreements of Affiliates.  At least thirty (30) days prior to
the Closing Date, Presidio shall cause to be prepared (and updated from time to
time as may be necessary) and delivered to Tom Brown a list identifying all
persons who, at that time, may be deemed to be "affiliates" of Presidio as that
term is used in paragraph (a) of Section 1145 of the Bankruptcy Code and
paragraphs (c) and (d) of Rule 145 under the 1933 Act.  Presidio shall use its
reasonable efforts to cause each person who is identified as an affiliate of
Presidio in such list to execute and deliver to Tom Brown, on or prior to the
Closing Date, a written agreement, in the form attached hereto as Exhibit E.
Tom Brown





                                      -20-
<PAGE>   63
shall be entitled to place legends as specified in such agreements on the
certificates representing any Exchange Common Stock to be distributed to such
persons in the Exchange.

         4.13    Amendment to Plan.  Without the prior consent of Tom Brown,
which shall not be unreasonably withheld, no Presidio Party shall amend the
terms and provisions of the Plan of Reorganization.

         4.14    Costs and Expenses.  Except as set forth in Section 9.2(b),
each party to this Agreement will be responsible for and will pay all costs,
fees, and expenses incurred by such party in connection with the preparation,
negotiation, and execution of this Agreement, the Plan of Reorganization, the
Disclosure Statement and all other documents and instruments contemplated
herein, including:

                 (a)      all fees, costs, and expenses of its counsel,
         engineers, accountants, financial advisors, and others engaged by such
         party; and

                 (b)      all fees, costs and expenses incurred by such party
         in connection with filings made by it relating to the transactions
         contemplated by this Agreement under the Hart Scott Act, the 1933 Act,
         the 1934 Act, the Bankruptcy Code, or any other federal or state laws,
         rules, and regulations.

         4.15    New D&O Insurance.

                 (a)      At the Closing, Tom Brown shall take all reasonable
         actions necessary to acquire or to cause (which shall include the
         payment of the required premium in the amount described in the policy
         attached to the letter identified below to the extent not previously
         paid) Presidio to acquire for the benefit of each of the Directors and
         Officers the policy of directors and officers liability insurance in
         the form attached to that certain letter of even date herewith from
         Presidio to Tom Brown and identified therein as being provided
         pursuant to this Section 4.15 (the "New D&O Insurance").  For the time
         period commencing as of the Closing Date and ending as of the sixth
         anniversary of the Closing Date, Tom Brown shall take all reasonable
         actions required by the terms of the New D&O Insurance policy
         necessary to keep in full force and effect the New D&O Insurance.

                 (b)      From and after the Closing neither Tom Brown nor any
         Presidio Party shall take any action to modify any provision contained
         in the certificate of incorporation or bylaws of any Presidio Party or
         any contract or agreement which exculpates, limits, or restricts the
         liability of any of the Directors and Officers to any Presidio Party;
         any Presidio Securityholder or any other person arising out of or
         pertaining to acts or omissions, by such person in his capacity as a
         director, officer, employee or agent of a Presidio Party.

                 (c)      On or before the Closing, Presidio shall (i) use its
         reasonable efforts to obtain waivers and releases effective as of the
         Closing, in form and substance reasonably satisfactory to Tom Brown,
         of all rights to indemnity which may exist in favor of any officers or
         directors of any of the Presidio Parties (and from any other persons
         who may be





                                      -21-
<PAGE>   64
         entitled to indemnity from any of the Presidio Parties) under the
         respective charters, by-laws or agreements of any of the Presidio
         Parties or under applicable law or (ii) obtain a Final Order of the
         Bankruptcy Court which discharges all such obligations of indemnity.

                 (d)      From and after the Closing, Tom Brown shall use its
         best efforts or shall take all actions necessary to cause Presidio to
         use its best efforts to give each Director and Officer notice (within
         five (5) business days) of the assertion or threatened (in writing)
         assertion of any claims, actions, suits, or proceedings that name or
         threaten (in writing) to name any Director or Officer as a party or
         which relates to acts or omissions by any such person in his capacity
         as a director, officer, employee or agent of a Presidio Party.

                 (e)      The provisions of this Section 4.15 are intended to
         be for the benefit of, and shall be enforceable by, the parties hereto
         and each of the Directors and Officers and their respective heirs and
         representatives.

         4.16    Information Kept Confidential.  Except as otherwise
contemplated in this Agreement, Tom Brown shall hold in strict confidence all
aspects of the transactions contemplated by this Agreement and all information
and data concerning the Oil and Gas Assets which has been obtained from
Presidio in connection with the transactions contemplated by this Agreement in
accordance with the terms and provisions of the Confidentiality Agreement,
which Confidentiality Agreement is hereby ratified and adopted by the parties
hereto and incorporated by reference herein.

         4.17    Pre-Closing Action.   Presidio and Tom Brown shall use all
reasonable efforts to cause all of the conditions precedent to the consummation
of the transactions contemplated by this Agreement applicable to each of them
to be met as promptly as possible and to take all such other actions as may be
reasonably necessary to effect the consummation of the transactions
contemplated by this Agreement.

         4.18    Public Announcements.   Each party hereto shall consult with
the other party hereto prior to any public announcement by such party regarding
the existence of this Agreement, the contents hereof or the transactions
contemplated hereby; provided, however, the foregoing shall not restrict
disclosures by Tom Brown or Presidio made in order to comply with applicable
securities or other laws or made in order to comply with judicial decrees or
orders or existing loan or other agreements binding such party (or its
Affiliates), as determined in such party's discretion.

         4.19    Conduct of Presidio's Business Pending Closing.  Except as
otherwise contemplated by this Agreement, Presidio covenants and agrees with
Tom Brown that, from the date of this Agreement until the Closing, each
Presidio Party will conduct its business only in the ordinary and usual course
consistent with past practices.  Notwithstanding the preceding sentence,
Presidio covenants and agrees with Tom Brown that, except as otherwise
contemplated in this Agreement or the Plan of Reorganization, from the date of
this Agreement until the Closing, without the prior written consent of Tom
Brown:

                 (a)      No Presidio Party will engage in any type of business
         in which it is not engaged as of the date of this Agreement;





                                      -22-
<PAGE>   65
                 (b)      No Presidio Party will (i) amend its certificate or
         articles of incorporation or bylaws, (ii) split, combine, or
         reclassify any of its outstanding capital stock or other securities or
         make any other changes in its capital structure, (iii) except for
         dividends or distributions made to another Presidio Party, declare,
         set aside, or pay any dividends or other distributions (whether
         payable in cash, property, or securities) with respect to its capital
         stock, (iv) issue, sell, or agree to issue or sell any securities,
         including its capital stock, any rights, options, or warrants to
         acquire its capital stock, or securities convertible into or
         exchangeable or exercisable for its capital stock (other than shares
         of Presidio Common Stock issued pursuant to the exercise of any
         Presidio Options or Warrants), (v) purchase, cancel, retire, redeem,
         or otherwise acquire any of its outstanding capital stock or other
         securities, (vi) merge or consolidate with, or transfer all or
         substantially all of its assets to, another corporation or other
         business entity, (vii) liquidate, wind-up, or dissolve (or suffer any
         liquidation or dissolution), or (viii) enter into any contract,
         agreement, commitment, or arrangement with respect to any of the
         foregoing;

                 (c)      Except as set forth in Schedule 4.19, no Presidio
         Party will (i) acquire any corporation, partnership, or other business
         entity or any interest therein (other than interests in joint
         ventures, joint operation or ownership arrangements, or tax
         partnerships acquired in the ordinary course of business), (ii) sell,
         lease or sublease, transfer, or otherwise dispose of or mortgage,
         pledge, or otherwise encumber or grant any rights or interests with
         respect to any Oil and Gas Assets that, individually or in the
         aggregate, were assigned a value in the Reserve Report of $100,000 or
         more or any other assets that, individually or in the aggregate, have
         a value at the time of such sale, lease, sublease, transfer, or
         disposition of $100,000 or more (except that this clause shall not
         apply to the sale of severed oil, gas and other minerals produced and
         sold in the ordinary course of business or the expenditure of the
         Presidio Parties' cash and cash items in the ordinary course of
         business), (iii) farm-out any Oil and Gas Assets or interest therein,
         (iv) sell, transfer, or otherwise dispose of or mortgage, pledge, or
         otherwise encumber any securities of any other person, (v) enter into
         any agreement requiring a payment or expenditure thereunder by a
         Presidio Party in excess of $100,000 and not terminable by a Presidio
         Party upon notice of thirty (30) days or less and without penalty or
         other obligation, (vi) enter into any transaction (x) pursuant to
         which a Presidio Party will make a payment or incur an expenditure in
         excess of $100,000 or (y) not in the ordinary course of business and
         not contemplated by this Agreement, (vii) agree with any person to
         limit or otherwise restrict in any manner the ability of a Presidio
         Party to compete or otherwise conduct its business, or (viii) enter
         into any contract, agreement, commitment, or arrangement with respect
         to any of the foregoing;

                 (d)      No Presidio Party shall make any payments in respect
         of the Debt Obligations; provided, however, that the Presidio Parties
         may make interest payments accruing on the Subordinated Gas Indexed
         Notes not to exceed $8,000 per quarter;

                 (e)      No Presidio Party will (i) except for loans extended
         by another Presidio Party, incur any additional indebtedness for
         borrowed money or any other obligation or liability (other than
         interest accruing on existing indebtedness and liabilities incurred in
         the ordinary course of business and consistent with past practices),
         (ii) assume, endorse (other than





                                      -23-
<PAGE>   66
         endorsements of negotiable instruments in the ordinary course of
         business), guarantee, or otherwise become liable or responsible
         (whether directly, contingently, or otherwise) for the liabilities or
         obligations of any person not a Presidio Party, (iii) make any
         material loans, advances or capital contributions to, or investments
         in any person (other than loans or advances in the ordinary course of
         business and consistent with past practices, advances for business
         expenses made to officers and employees of such Presidio Party,
         short-term investments made pursuant to customary cash management
         systems of such Presidio Party in the ordinary course and consistent
         with past practices and loans, advances, capital contributions to, or
         investments in, another Presidio Party) or (iv) enter into any
         contract, agreement, commitment, or arrangement with respect to any of
         the foregoing;

                 (f)      Each Presidio Party will operate, maintain, and
         otherwise deal with the Oil and Gas Assets in accordance with good and
         prudent oil and gas field practices (including the making of all
         appropriate repairs, renewals, and replacements of equipment
         associated therewith) and in material compliance with all applicable
         oil and gas leases and other contracts or agreements and all
         applicable laws, rules, and regulations;

                 (g)      No Presidio Party will pay or incur drilling or other
         capital expenditures in excess of $100,000 with respect to any well
         (other than in accordance with the expenditures listed in Schedule
         4.19 or, under emergency circumstances, expenditures necessary for the
         preservation or protection of a Presidio Party's assets or the
         preservation or protection of the public safety or health);

                 (h)      No Presidio Party shall voluntarily resign, transfer
         or otherwise relinquish any right it has as of the date of this
         Agreement, as operator of any of the Oil and Gas Assets;

                 (i)      No Presidio Party will (i) enter into, or otherwise
         become liable or obligated under or pursuant to (x) any employee
         benefit, pension, or other plan (whether or nor subject to ERISA), (y)
         any stock option, stock purchase, incentive, or deferred compensation
         plans or arrangements or fringe benefit plan, or (z) any consulting,
         employment, severance, termination, or similar agreement with any
         person, except for the Existing Plans, (ii) hire any key employee,
         (iii) grant, or otherwise become liable for or obligated to pay, any
         severance or termination payments, bonuses, or increases in
         compensation or benefits to, or forgive any indebtedness of, any
         director, officer, employee, or consultant (other than payments,
         bonuses or increases in compensation or benefits or forgiveness of
         indebtedness that are required by the terms of the Existing Plans as
         in effect as of the date of this Agreement), or (iv) enter into any
         contract, agreement, commitment, or arrangement to do any of the
         foregoing;

                 (j)      Presidio will keep and maintain accurate consolidated
         books, records, and accounts in accordance with GAAP;

                 (k)      Each Presidio Party, as appropriate, will (i) pay all
         Taxes, assessments, and other governmental charges imposed upon any of
         its assets or with respect to its franchises, business, income, or
         assets before any penalty or interest accrues thereon, (ii) pay all
         claims (including claims for labor, services, materials, and supplies)
         that have become due and





                                      -24-
<PAGE>   67
         payable and which by law have or may become a Lien upon any of its
         assets prior to the time when any penalty or fine shall be incurred
         with respect thereto or any such Lien shall be imposed thereon, and
         (iii) comply in all material respects with the requirements of all
         applicable laws, rules, regulations, and orders of any Governmental
         Authority (provided, however, that a Presidio Party may contest the
         imposition of any Taxes, assessments, and other governmental charges,
         any such claim, or the requirements of any applicable law, rule,
         regulation, or order if done so in good faith by appropriate
         proceedings and if adequate reserves are established in accordance
         with GAAP or as may be determined as sufficient by Presidio's board of
         directors);

                 (l)      Each Presidio Party will use its reasonable efforts
         to maintain in full force and effect the policies or binders of
         insurance currently maintained by it and shall promptly notify Tom
         Brown if any are not so maintained;

                 (m)      Each Presidio Party will use its reasonable efforts
         to preserve intact its assets and business organization and to
         preserve the goodwill of those having business relationships with it;
         provided, however, that a Presidio Party shall not be required to make
         any payments (other than as may be contractually committed and due) or
         enter into or amend any contractual arrangements to satisfy the
         foregoing obligation; and

                 (n)      Each Presidio Party will at all times preserve and
         keep in full force and effect its corporate existence and rights and
         franchises material to its performance under this Agreement.

         4.20    No Solicitation.

                 (a)      From and after the date of this Agreement, no
         Presidio Party will (and each Presidio Party will use its reasonable
         efforts to cause the Presidio Representatives not to), directly or
         indirectly, make, solicit, initiate, engage or participate in
         discussions or negotiations with or provide information to, any person
         (other than Tom Brown or any of its representatives) or enter into any
         agreement or agreement in principle, or announce any intention to do
         any of the foregoing, with respect to any offer or proposal to acquire
         all or any part of the outstanding capital securities of any Presidio
         Party or all or any material portion of the assets or business of a
         Presidio Party, whether by merger, purchase of assets, tender offer,
         exchange offer, business combination, sale of substantial assets, sale
         of securities, liquidation, dissolution, or otherwise (an "Alternative
         Transaction"), other than the transactions contemplated by this
         Agreement.

                 (b)      Promptly following the execution of this Agreement,
         each Presidio Party will (and will cause the Presidio Representatives
         to) terminate any existing activities, discussions, or negotiations
         with third parties (other than Tom Brown) with respect to any possible
         Alternative Transaction.

                 (c)      Notwithstanding the provisions of Section 4.20(a) and
         Section 4.20(b), (i) a Presidio Party and the Presidio Representatives
         may furnish information to and negotiate and





                                      -25-
<PAGE>   68
         have discussions with any person who has made an unsolicited bona fide
         proposal in regard to an Alternative Transaction if the board of
         directors of Presidio determines, after consultation with its outside
         legal counsel, that the failure to furnish such information to or
         negotiate or have discussions with such person conflicts with the
         proper discharge of their fiduciary duties and (ii) the board of
         directors of Presidio shall not be prohibited from taking and publicly
         disclosing a position with respect to an Alternative Transaction if
         required to do so pursuant to Rule 14d-9 and Rule 14e-2 under the 1934
         Act or from making such disclosure which, in the judgment of the board
         of directors of Presidio, may be required under applicable law.
         Presidio will promptly notify Tom Brown in the event of any
         discussion, negotiation, proposal or offer of the type referred to
         above or any decision to furnish information or take any other action
         referred to in this Section 4.20(c).

         4.21    Employees.  Within sixty (60) days of the date of this
Agreement, Tom Brown shall provide Presidio with a list of the employees of the
Presidio Parties who as of that date, Tom Brown intends not to be employed
after the Closing by either Tom Brown, Presidio, or an Affiliate thereof,
together with the proposed date that each such employee's employment will be
terminated.  From and after such date, Tom Brown shall use its reasonable
efforts to provide Presidio with one or more supplements to such list and, at
least thirty (30) days prior to the Closing, Tom Brown shall use its reasonable
efforts to provide Presidio with a final supplement to such list.  The
provisions of this Section 4.21 are not intended to create and shall not be
construed as creating any right in favor of any such employee of the Presidio
Parties, including any continuing right of employment on the part of any
employee who is not named on such list or supplement thereto.

         4.22    Severance Plan and Agreements.  Tom Brown shall take all
actions necessary to cause (which, if necessary, shall include making
additional capital contributions to Presidio consisting of cash or shares of
Tom Brown Common Stock, as appropriate) Presidio to pay at the Closing to all
employees who are either named in the list or any supplement thereto to be
provided pursuant to Section 4.21 or whose employment is otherwise terminated
at Closing, all amounts which such employees would be due (at or within thirty
(30) days of the time of their termination of employment) under the Severance
Plan and Key Employee Severance Agreements set forth in Schedule 4.22,
including all amendments and modifications thereto (collectively, the
"Severance Plan and Agreements").  From and after the Closing, Tom Brown shall
take all actions necessary to cause (which, if necessary, shall include making
additional capital contributions to Presidio consisting of cash or shares of
Tom Brown Common Stock, as appropriate) Presidio to assume and make all other
payments, and to assume and provide all benefits, required to be paid or
provided to the employees and officers of the Presidio Parties in accordance
with the provisions of the Severance Plan and Agreements.  Tom Brown hereby
acknowledges that the obligations under the Key Employee Severance Agreements
set forth in Schedule 4.22 include the obligation arising under Section 2
thereof to provide the rights and benefits described in Section 3 thereof to
any such employee whose employment is terminated at any time within two years
following the Closing Date.  Tom Brown shall take all actions necessary to
cause Presidio to not amend or modify the terms and provisions of the Severance
Plan and Agreements without the prior consent of the beneficiaries or
beneficiary, as applicable, of such Severance Plan and Agreements.  Tom Brown
shall take all actions necessary to cause (which, if necessary, shall include
making additional cash capital contributions to Presidio) Presidio to provide
insurance coverage for the time period required under





                                      -26-
<PAGE>   69
the Severance Plan and Agreements, under one or more insurance plans providing
substantially comparable benefits to those provided under Presidio's current
insurance plans and at no employee cost, to all employees of Presidio who are
entitled to such benefits under the Severance Plan and Agreements.  Nothing in
this Section 4.22 shall be construed to limit the right of any employee to any
benefits under the Consolidated Omnibus Budget Reconciliation Act of 1985, as
amended.

         4.23    Presidio ESOP.  Prior to the Closing, Presidio shall terminate
the Employee Stock Ownership Plan of Presidio Oil Company (the "ESOP"), cause
all current participants in the ESOP to become 100% vested in their accounts
under the ESOP, and file an application for a favorable determination letter
with the Internal Revenue Service that the termination of the ESOP does not
adversely affect the qualification of the ESOP.  At the Closing, Presidio shall
cause the ESOP accounts (then consisting of Exchange Common Stock) to be
distributed to the participants and beneficiaries pursuant to the terms of the
ESOP.

         4.24    Presidio 401K.  Subsequent to the Closing, Tom Brown may cause
Presidio to terminate the Presidio Oil Company 401k Plan (the "401k Plan") or
merge the 401k Plan into another qualified plan of Tom Brown.  From and after
the Closing, Tom Brown shall take all actions necessary to cause Presidio to
cause each employee of a Presidio Party who is not employed by Tom Brown or an
Affiliate thereof after the Closing or any such employee who is employed by Tom
Brown or an Affiliate thereof after the Closing but whose employment is
subsequently terminated to receive a distribution of all benefits under the
401k Plan of such person as soon after such termination of employment as is
administratively possible.

         4.25    Other Plans.  Except to the extent already provided in Section
4.22, at the Closing, Tom Brown shall take all actions necessary to cause
(which, if necessary, shall include making additional cash contributions to
Presidio) Presidio to pay at the Closing to the employees and officers of the
Presidio Parties all amounts which such employees and officers would be due (at
or within thirty (30) days of the time of their termination of employment) in
accordance with the provisions of the Employee Benefit Plans.  Except to the
extent already provided in Sections 4.22, 4.23 and 4.24, from and after the
Closing, Tom Brown shall take all actions necessary to cause (which, if
necessary, shall include making additional cash capital contributions to
Presidio) Presidio to assume and make all vested payments, and provide all
benefits, required to be paid or provided to the employees and officers of the
Presidio Parties in accordance with the provisions of the Employee Benefit
Plans.

         4.26    Letters of Credit.  At the Closing, Tom Brown shall or shall
cause Presidio to have issued by a commercial bank or banks a substitute letter
of credit for each of the letters of credit set forth in Schedule 4.26 in form
and substance acceptable to each of the beneficiaries of each such letter of
credit.

         4.27    Certain Tom Brown Transactions.  Except as otherwise
contemplated by this Agreement, Tom Brown covenants and agrees with Presidio
that, from the date of this Agreement until the Closing, Tom Brown and its
Affiliates who are controlled by it will, taken as a whole, remain primarily
engaged in the businesses relating to the exploration and production of oil,
gas and other minerals and the treatment, processing, storage, transportation
and marketing of oil, gas and





                                      -27-
<PAGE>   70
other minerals.  Prior to the Exchange and until the Closing or termination of
this Agreement, Tom Brown shall not and it shall not allow any Affiliate
thereof to directly or indirectly sell, transfer, or otherwise dispose of
(except to an Affiliate) any Presidio Securities beneficially owned as of the
date of this Agreement by Tom Brown or any Affiliate thereof or any Presidio
Securities hereafter acquired by Tom Brown or any Affiliate thereof.

                                   ARTICLE V

                   REPRESENTATIONS AND WARRANTIES OF PRESIDIO

         5.1     Disclaimers.

                 (a)      Prior to the execution of this Agreement, Tom Brown
         has been afforded the opportunity to inspect the Oil and Gas Assets
         and to examine the records of Presidio at Presidio's offices with
         respect to the Oil and Gas Assets, and has been afforded access to all
         information in Presidio's possession with respect to the Oil and Gas
         Assets.  TOM BROWN ACKNOWLEDGES THAT, EXCEPT AS EXPRESSLY PROVIDED IN
         THIS ARTICLE V, PRESIDIO, ITS OFFICERS, DIRECTORS, EMPLOYEES,
         REPRESENTATIVES AND AGENTS HAVE MADE NO, AND PRESIDIO HEREBY EXPRESSLY
         DISCLAIMS ANY, REPRESENTATIONS OR WARRANTIES AS TO THE ACCURACY OR
         COMPLETENESS OF SUCH INFORMATION, AS TO A PRESIDIO PARTY'S TITLE TO
         THE OIL AND GAS ASSETS, OR AS TO ANY OTHER INFORMATION, DATA OR OTHER
         MATERIALS (WRITTEN OR ORAL) FURNISHED TO TOM BROWN BY OR ON BEHALF OF
         PRESIDIO (INCLUDING THE EXISTENCE OR EXTENT OF OIL, GAS OR OTHER
         MINERAL RESERVES, THE RECOVERABILITY OF OR THE COST OF RECOVERING ANY
         SUCH RESERVES, THE VALUE OF SUCH RESERVES, ANY PRODUCTION PRICING
         ASSUMPTIONS, PRESENT OR PAST PRODUCTION RATES, COMPLIANCE WITH LEASE
         TERMS, THE CONDITION OF ANY WELL, AND THE ABILITY TO SELL OIL OR GAS
         PRODUCTION AFTER CLOSING).

                 (b)      PRESIDIO EXPRESSLY DISCLAIMS ANY WARRANTY AS TO THE
         CONDITION OF ANY PERSONAL PROPERTY, FIXTURES AND ITEMS OF MOVABLE
         PROPERTY COMPRISING ANY PART OF THE OIL AND GAS ASSETS INCLUDING (i)
         ANY IMPLIED OR EXPRESS WARRANTY OF MERCHANTABILITY, (ii) ANY IMPLIED
         OR EXPRESS WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, (iii) ANY
         IMPLIED OR EXPRESS WARRANTY OF CONFORMITY TO MODELS OR SAMPLES OF
         MATERIALS, (iv) ANY RIGHTS OF TOM BROWN UNDER APPLICABLE STATUTES TO
         CLAIM DIMINUTION OF CONSIDERATION, AND (v) ANY CLAIM BY TOM BROWN FOR
         DAMAGES BECAUSE OF DEFECTS, WHETHER KNOWN OR UNKNOWN, IT BEING
         EXPRESSLY UNDERSTOOD BY TOM BROWN THAT THE PERSONAL PROPERTY, FIXTURES
         AND ITEMS ARE TO BE ACCEPTED AS IS, WHERE IS, WITH ALL FAULTS, AND IN
         THEIR PRESENT CONDITION AND STATE OF REPAIR AND THAT TOM BROWN HAS
         MADE OR CAUSED TO BE MADE SUCH INSPECTIONS AS TOM BROWN DEEMS
         APPROPRIATE.





                                      -28-
<PAGE>   71
                 (c)      NOTWITHSTANDING ANY PROVISIONS CONTAINED HEREIN TO
         THE CONTRARY, NO REPRESENTATION AND WARRANTY CONTAINED IN THIS ARTICLE
         V MAY BE BREACHED BY REASON OF ANY PERMITTED CLAIM.

                 (d)      All information and data set forth in each of the
         separately numbered Schedules hereto shall be deemed by this reference
         to be set forth in all such other Schedules delivered pursuant to this
         Agreement; provided, that the information and data set forth in
         Schedule 5.25 shall not be deemed pursuant to this Section 5.1(d) to
         be set forth in Schedule 5.12.  Except as otherwise provided in this
         Section 5.1(d), it is the intent of the parties that once particular
         information and data is disclosed in a Schedule hereto, that the same
         information and data need not be contained in another Schedule hereto.

                 (e)      Subject to this Section 5.1, and the information and
         data disclosed on any Schedule hereto, Presidio hereby makes the
         representations and warranties contained in the remaining Sections of
         this Article V.

         5.2     Existence.  Each of Presidio Exploration and Palisade Oil is a
corporation duly organized, validly existing, and in good standing under the
laws of the State of Colorado and each of Presidio and Presidio West Virginia
is a corporation duly organized, validly existing, and in good standing under
the laws of the State of Delaware.  Each Presidio Party is duly qualified to do
business as a foreign corporation in the state(s) where the character of the
properties owned or leased by such Presidio Party or the nature of its
activities make such qualification necessary.  Each of the Presidio Parties has
full corporate power and authority to own its properties and assets and to
carry on its business as now being conducted.

         5.3     Authorization and Enforceability.  Each Presidio Party has the
corporate power and authority to enter into and, subject to the requisite
approval of the Bankruptcy Court and the Presidio Securityholders and the
issuance of the Confirmation Order, perform this Agreement and the transactions
contemplated by this Agreement.  The execution, delivery, and performance of
this Agreement, and the transactions contemplated hereby, have been duly and
validly authorized by all necessary corporate action on the part of each
Presidio Party except for the requisite approval of the Presidio
Securityholders.  This Agreement constitutes the valid and binding obligation
of Presidio enforceable in accordance with its terms.

         5.4     No Violations.  Subject to the requisite approval of the
Presidio Securityholders and the issuance of the Confirmation Order, the
execution, delivery and performance of this Agreement by each Presidio Party
and the consummation of the transactions contemplated by this Agreement, will
not (a) violate, conflict with or result in a breach of any provision of the
certificates of incorporation or bylaws of any Presidio Party, (b) violate,
conflict with or result in a breach of any provisions of, or constitute a
default (or an event which, with notice or lapse of time or both, would
constitute a default) under, or result in the creation of any Lien upon any of
the assets of any Presidio Party under, any contract, agreement, note, bond,
mortgage, indenture, deed of trust, license, franchise, permit, lease, plan,
instrument or other document ("Contract") binding on any Presidio Party, (c)
violate any judgment, injunction, order, ruling, or decree applicable to any
Presidio Party





                                      -29-
<PAGE>   72
as a party in interest, or the assets of any Presidio Party, or (d) violate any
law, rule, or regulation applicable to any Presidio Party or relating to its
assets.

         5.5     Claims and Litigation.  Except for the claims, actions, suits,
or proceedings expressly set forth in the Presidio SEC Documents or in Schedule
5.5, there are no claims, actions, suits, or proceedings pending (including
claims described in Section 510(b) of the Bankruptcy Code and new claims
asserted or new actions arising after the date of this Agreement that form a
part of suits or proceedings set forth in Schedule 5.5), or to the Knowledge of
Presidio, threatened against a Presidio Party.

         5.6     Consents and Approvals.  No consent, approval, order, or
authorization of, registration, declaration, or filing with, or permit (other
than filings required under the 1933 Act, the 1934 Act, the Hart Scott Act and
filings required by and the approval of the Bankruptcy Court) from any
Governmental Authority is required by or with respect to the Presidio Parties
in connection with the execution and delivery of this Agreement by the Presidio
Parties or the consummation by the Presidio Parties of the transactions
contemplated hereby, except for the approval of the Presidio Securityholders
and those otherwise expressly contemplated herein.

         5.7     Presidio SEC Documents.  Presidio has made available to Tom
Brown a true and complete copy of the Presidio SEC Documents, which are all the
documents (other than preliminary material) that Presidio was required to file
with the SEC since January 1, 1995.  As of their respective dates, the Presidio
SEC Documents complied in all material respects with the requirements of the
1933 Act or the 1934 Act, as the case may be, and the rules and regulations of
the SEC promulgated thereunder applicable to such Presidio SEC Documents, and
none of the Presidio SEC Documents contained any untrue statement of a material
fact or omitted to state a 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.

         5.8     Taxes.

                 (a)      Each Presidio Party and any affiliated, combined, or
         unitary group of which any such corporation is or was a member
         ("Presidio Tax Affiliates") has timely filed all Tax Returns that are
         required to be filed by it.  All such Tax Returns were correct and
         complete in all material respects.

                 (b)      Each Presidio Party and each Presidio Tax Affiliate
         has timely paid all Taxes that are due and payable (except for Taxes
         that are being contested in good faith by appropriate proceedings as
         of the date of this Agreement and for which reserves, which are
         adequate under GAAP, have been established in the Presidio Financial
         Statements).

                 (c)      Each Presidio Party and each Presidio Tax Affiliate
         has complied in all material respects with all applicable laws, rules,
         and regulations relating to the withholding and payment of Taxes and
         has in all material respects timely withheld and paid to the proper
         governmental authorities all amounts required to have been withheld
         and paid in connection





                                      -30-
<PAGE>   73
         with amounts paid or owing to any employee, independent contractor,
         creditor, or stockholder.

                 (d)      Except as set forth in Schedule 5.8, (i) no audits or
         other administrative or court proceedings are currently pending
         against a Presidio Party with regard to any Taxes for which a Presidio
         Party could be liable, (ii) no dispute or claim concerning any Taxes
         for which a Presidio Party could be liable either (A) has been claimed
         or raised by any taxing authority in writing or (B) is known by the
         directors and officers (and employees responsible for Tax matters) of
         a Presidio Party, (iii) with respect to each Presidio Party, there are
         no pending requests for rulings from any taxing authority with respect
         to any Taxes, (iv) with respect to each Presidio Party, there are no
         proposed reassessments by any taxing authority of any of the assets of
         a Presidio Party, (v) with respect to each Presidio Party, there are
         no agreements in effect to extend the time to file any material Tax
         Return or to extend or waive the period of limitations for the
         assessment or collection of any Taxes for which a Presidio Party may
         be liable, and (vi) to the Knowledge of each Presidio Party, no claim
         has been made by any taxing authority in a jurisdiction where a
         Presidio Party does not file Tax Returns that it is or may be subject
         to taxation by that jurisdiction.

                 (e)      Except as set forth in Schedule 5.8, none of the
         Presidio Parties has made any payments, is obligated to make any
         payments or is a party to any agreement that under certain
         circumstances could obligate it to make any payments that will not be
         deductible under Code Section 280G.

                 (f)      Each of the Presidio Parties has disclosed on its
         federal income Tax Returns all positions taken therein that could give
         rise to a substantial understatement of federal income Tax within the
         meaning of Code Section 6662.

                 (g)      No Presidio Party (i) is a party to any Tax
         allocation or sharing agreement with any member of an Affiliated Group
         filing a consolidated federal income Tax Return with such Presidio
         Party, (ii) has been a member of an Affiliated Group filing a
         consolidated federal income Tax Return other than the group of which
         Presidio is the parent or (iii) has liability for the federal income
         taxes of any Person under Treas. Reg.  Section 1.1502-6, as a
         transferee or successor, by contract, or otherwise.

                 (h)      Prior to the Closing, no material election with
         respect to future Taxes will be made after the date of this Agreement
         without the written consent of Tom Brown.

                 (i)      The Presidio Parties have not filed a consent
         pursuant to the collapsible corporation provisions of Section 341(f)
         of the Code (or any corresponding provisions of state, local, or
         foreign income tax law) or agreed to have Section 341(f)(2) of the
         Code (or any corresponding provision of state, local, or foreign
         income tax law) apply to any disposition of any asset owned by it.





                                      -31-
<PAGE>   74
                 (j)      None of the Major Assets is property that the
         Presidio Parties are required to treat as being owned by any other
         person pursuant to the "safe harbor lease" provisions of former
         Section 168(f)(8) of the Code.

                 (k)      None of the Major Assets directly or indirectly
         secures any debt the interest on which is tax- exempt under Section
         103(a) of the Code.

                 (l)      None of the Major Assets is "tax-exempt use property"
         within the meaning of Section 168(h) of the Code.

                 (m)      No Presidio Party has agreed to make nor to the
         Knowledge of any of the Presidio Parties is it required to make any
         adjustment under Section 481(a) of the Code by reason of a change in
         accounting method or otherwise.

                 (n)      The Presidio Parties have not participated in and
         will not participate in any international boycott within the meaning
         of Section 999 of the Code.

                 (o)      The Presidio Parties are not and have not been a
         United States real property holding corporation as defined in Section
         897(c)(2) of the Code during the applicable period specified in
         Section 897(c)(1)(A)(ii) of the Code.

                 (p)      The Presidio Parties do not have and have not had a
         permanent establishment in any foreign country, as defined in any
         applicable tax treaty or convention between the United States and such
         foreign country.

                 (q)      The Presidio Parties have not made or will not make a
         consent dividend election under Section 565 of the Code.

         5.9     Employee Benefit Plans.

                 (a)      Notwithstanding any other provision of this Agreement
         to the contrary, this Section 5.9 contains the exclusive
         representations and warranties of Presidio with respect to matters
         governed by ERISA.  Except for the Severance Plan and Agreements,
         Schedule 5.9 sets forth a complete and accurate list of all "employee
         benefit plans," as defined in Section 3(3) of ERISA, and any other
         material employee compensation or benefit arrangement, including
         severance pay, sick leave, vacation pay, salary continuation for
         disability, consulting, or other compensation agreements, retirement,
         supplemental executive retirement agreements, deferred compensation,
         bonus, long-term incentive, stock option, stock purchase,
         hospitalization, medical insurance, dental insurance, life insurance,
         and educational assistance programs maintained by a Presidio Party or
         to which a Presidio Party is obligated to contribute, or with respect
         to which any Presidio Party has any liability, and each employment
         related agreement under which a Presidio Party is obligated (the
         "Employee Benefit Plans").  Except for the Employee Benefit Plans and
         the Severance Plan and Agreements, no Presidio Party maintains or has
         any obligation under any other compensation





                                      -32-
<PAGE>   75
         based or related arrangement.  Copies of each Employee Benefit Plan
         have been furnished to Tom Brown.

                 (b)      There is no material violation of ERISA with respect
         to any of the Employee Benefit Plans.

                 (c)      The Employee Benefit Plans have been maintained, in
         all material respects, in accordance with their terms and with all
         applicable federal and state law, each Employee Benefit Plan intended
         to be qualified under Section 401(a) of the Code is so qualified, and
         no Presidio Party nor any "party in interest" or "disqualified person"
         with respect to the Employee Benefit Plans has engaged in any
         "prohibited transaction" within the meaning of Section 4975 of the
         Code or Section 406 of ERISA for which there is no exemption.

                 (d)      No Employee Benefit Plan is subject to Title IV of
         ERISA and no Presidio Party has any obligation, including any
         contingent liability, to contribute to a "multiemployer plan" within
         the meaning of Section 3(37) of ERISA.

                 (e)      Except as set forth in Schedule 5.9, no Presidio
         Party has any liability under any group health plan with respect to
         any current or former employees beyond their termination of
         employment, other than as required by Section 4980B of the Code or
         pursuant to the Severance Plan and Agreements.

         5.10    Financial Statements.  The Presidio Financial Statements were
prepared in accordance with GAAP applied on a consistent basis during the
periods involved (except as may be indicated in the notes thereto or, in the
case of unaudited statements, as permitted by Rule 10-01 of Regulation S-X of
the SEC) and fairly present in accordance with applicable requirements of GAAP
(subject, in the case of the unaudited statements, to normal, recurring
adjustments, none or which will be material) the consolidated financial
position of Presidio and its consolidated subsidiaries as of their respective
dates and the consolidated results of operations and the consolidated cash
flows of Presidio and its consolidated subsidiaries for the periods presented
therein.

         5.11    Capital Structure.

                 (a)      As of the date of this Agreement, the authorized
         capital stock of each Presidio Party is as set forth in Schedule 5.11.

                 (b)      As of the close of business on June 30, 1996, there
         were issued and outstanding (i) 25,318,085 shares of Presidio Class A
         Common Stock and 3,216,585 shares of Presidio Class B Common Stock and
         (ii) options and warrants relating to 1,268,000 shares of Presidio
         Class A Common Stock and 1,025,981 shares of Presidio Class B Common
         Stock as set forth in Schedule 5.11 (the "Presidio Options or
         Warrants").  Except as set forth in this Section 5.11(b) or as
         otherwise disclosed in the Presidio SEC Documents, there are
         outstanding as of the date of this Agreement (i) no shares of capital
         stock or other equity securities of Presidio, (ii) no securities of
         Presidio or any other person convertible into or exchangeable or
         exercisable for shares of capital stock or other equity securities of
         Presidio,





                                      -33-
<PAGE>   76
         and (iii) no subscriptions, options, warrants, calls, rights
         (including preemptive rights), commitments, understandings, or
         agreements to which Presidio is a party or by which it is bound
         obligating Presidio to issue, deliver, sell, purchase, redeem, or
         acquire shares of capital stock or other equity securities of Presidio
         (or securities convertible into or exchangeable or exercisable for
         shares of capital stock or other equity securities of Presidio) or
         obligating Presidio to grant, extend, or enter into any such
         subscription, option, warrant, call, right, commitment, understanding,
         or agreement.

                 (c)      All outstanding shares of Presidio Common Stock are
         validly issued, fully paid, and nonassessable and not subject to any
         preemptive right.

                 (d)      Presidio directly or indirectly owns all outstanding
         shares of capital stock and other equity securities of each of the
         other Presidio Parties, free and clear of all liens, claims, and
         options of any nature (except for Permitted Encumbrances set forth in
         clause (m) of the definition thereof).  Except as set forth in
         Schedule 5.11, there are outstanding as of the date of this Agreement
         (i) no securities of a Presidio Party, or any other person convertible
         into or exchangeable or exercisable for shares of capital stock or
         other equity securities of a Presidio Party and (ii) no subscriptions,
         options, warrants, calls, rights (including preemptive rights),
         commitments, understandings, or agreements to which either a Presidio
         Party is a party or by which it is bound obligating a Presidio Party
         to issue, deliver, sell, purchase, redeem, or acquire shares of
         capital stock or other equity securities of a Presidio Party or
         securities convertible into or exchangeable or exercisable for shares
         of capital stock or other equity securities of a Presidio Party or
         obligating a Presidio Party to grant, extend, or enter into any such
         subscription, option, warrant, call, right, commitment, understanding,
         or agreement.

         5.12    No Undisclosed Liabilities.  No Presidio Party has any direct
or indirect liabilities, indebtedness, obligations, expenses, claims (including
claims as defined in Section 101(5) of the Bankruptcy Code, and disputed
claims, obligations or liens as defined in Section 101(37) of the Bankruptcy
Code), deficiencies, guarantees or endorsements of or by any person (other than
endorsements of notes, bills and checks presented to banks for collection or
deposit in the ordinary course of business) of any kind whatsoever, whether
accrued, contingent, absolute, determined, determinable, or otherwise
("Liabilities"), other than (a) Liabilities reflected in the Presidio Financial
Statements in accordance with GAAP or disclosed in the Presidio SEC Documents,
(b) Liabilities incurred in the ordinary course of business subsequent to
December 31, 1995, (c) Liabilities arising under or otherwise disclosed in this
Agreement (except for disclosures made pursuant to Section 5.25), (d)
Liabilities set forth in Schedule 5.12, (e) Liabilities that have been
reimbursed or paid under insurance coverage maintained by the Presidio Parties
or any other person or as to which an insurance company or other insuring
entity has acknowledged its obligation to reimburse or pay such Liabilities,
and (f) Liabilities arising from any agreement, fact, event, or action that is
the subject matter of any other representation and warranty contained in this
Article V (other than Section 5.25).

         5.13    Absence of Certain Changes or Events.  Except as otherwise set
forth in either Schedule 5.13, or the Presidio SEC Documents, or as
contemplated by this Agreement, since





                                      -34-
<PAGE>   77
December 31, 1995, the Presidio Parties have used all reasonable efforts to
preserve and retain the business, employees, properties, suppliers, and
goodwill of the Presidio Parties and have operated their respective operations
and conducted business generally only in the ordinary and usual course
consistent with past practice, and no Presidio Party has done any of the
following:

                 (a)      Discharged or satisfied any Lien or paid any
         obligation or liability, absolute or contingent, other than current
         liabilities incurred and paid in the ordinary course of business and
         consistent with past practices;

                 (b)      Except for transactions between the Presidio Parties,
         paid or declared any dividends or distributions, purchased, redeemed,
         acquired, or retired any indebtedness, stock, or other securities from
         its stockholders or other securityholders, made any loans or advances
         or guaranteed any loans or advances to any person, or otherwise
         incurred any liabilities (other than current liabilities incurred in
         the ordinary course of business and consistent with past practices);

                 (c)      Except for Permitted Encumbrances and Permitted
         Claims, suffered or permitted any Lien to arise or be granted or
         created against or upon any of its assets;

                 (d)      Cancelled, waived, or released any rights or claims
         against, or indebtedness owed by, third parties;

                 (e)      Amended its certificate or articles of incorporation
         or by-laws;

                 (f)      Made or permitted any amendment, supplement,
         modification, or termination of any material agreement;

                 (g)      Paid or made any agreement to pay any bonuses,
         severance or termination payment to any employee or consultant;

                 (h)      (i) Sold, leased or subleased, transferred, or
         otherwise disposed of or mortgaged, pledged, or otherwise encumbered
         or granted any rights or interests with respect to any Oil and Gas
         Assets that, individually or in the aggregate, were assigned a value
         in the Reserve Report of $100,000 or more or any other assets that,
         individually or in the aggregate, have a value at the time of such
         sale, lease, sublease, transfer, or disposition of $100,000 or more
         (except that this clause shall not apply to the sale of severed oil,
         gas and other minerals produced and sold in the ordinary course of
         business or the expenditure of the Presidio Parties' cash and cash
         items in the ordinary course of business), (ii) farmed-out any Oil and
         Gas Assets or interest therein, (iii) sold, transferred, or otherwise
         disposed of or mortgaged, pledged, or otherwise encumbered any
         securities of any other person, (iv) made any material loans,
         advances, or capital contributions to, or investments in, any person
         (other than loans or advances in the ordinary course of business and
         consistent with past practices or loans, advances or capital
         contributions to, or investments in, another Presidio Party), (v)
         entered into any agreement requiring a payment or expenditure
         thereunder by a Presidio Party in excess of $100,000 and not
         terminable upon notice of thirty (30) days or less and without





                                      -35-
<PAGE>   78
         penalty or other obligation (other than agreements entered into in the
         ordinary course of business and consistent with past practices), (vi)
         entered into any transaction (x) pursuant to which a Presidio Party
         will make a payment or incur an expenditure in excess of $100,000 or
         (y) which is not in the ordinary course of business and not
         contemplated by this Agreement, (vii) other than areas of mutual
         interest commonly set forth in operating agreements, agreed with any
         person to limit or otherwise restrict in any manner the ability of a
         Presidio Party to compete or otherwise conduct its business, or (viii)
         entered into any contract, agreement, commitment, or arrangement with
         respect to any of the foregoing;

                 (i)      Made any investment in or contribution, payment, or
         advance to any person (other than investments, contributions,
         payments, or advances made in the ordinary course of business and
         consistent with past practices);

                 (j)      (i) entered into or amended any material employment,
         compensation or severance agreements, (ii) changed or established any
         new bonuses, (iii) increased the level of compensation or benefits,
         including under any Employee Benefit Plans, of any officer, director,
         or other executive personnel or any consultant, (iv) established,
         entered into or amended in any material respect any pension, employee
         benefit or health plans or any other plans, policies, programs,
         practices, or arrangements relating to employee benefits or
         compensation other than to maintain compliance with any applicable law
         or regulation or (v) paid any bonuses to any officer, director, or
         other executive personnel or any consultant; provided, however,
         Presidio shall terminate its Employee Stock Ownership Plan as provided
         in Section 4.23; or

                 (k)      Made any change in any of the accounting principles
         followed by it or the method of applying such principles other than in
         accordance with GAAP.

         5.14    Governmental Regulation.  No Presidio Party is subject to
regulation under the Public Utility Holding Company Act of 1935 or the
Investment Company Act of 1940.

         5.15    Labor Matters.

                 (a)      No employees of a Presidio Party are represented by
         any labor organization.  To the Knowledge of Presidio, there are no
         organizing activities involving a Presidio Party pending with any
         labor organization or group of employees of a Presidio Party.

                 (b)      Except as set forth in Schedule 5.15, each Presidio
         Party is in material compliance with all laws, rules, regulations, and
         orders relating to the employment of labor, including all such laws,
         rules, regulations, and orders relating to wages, hours, collective
         bargaining, discrimination, civil rights, safety and health, workers'
         compensation, and the collection and payment of withholding or Social
         Security Taxes and similar Taxes.

         5.16    Accounts Receivable.  Except as otherwise set forth in
Schedule 5.16, all of the accounts, notes, and loans receivable that have been
recorded on the Presidio Financial Statements are bona fide and represent
accounts, notes, and loans receivable validly due for goods sold or





                                      -36-
<PAGE>   79
services rendered and are reasonably expected to be collected in full within
ninety (90) days after the applicable invoice or note maturity date (other than
to the extent of the allowance or reserve for uncollectible accounts, notes,
and loan receivables contained in the Presidio Financial Statements).  Except
for Permitted Encumbrances set forth in clause (m) of the definition thereof,
all of such accounts, notes, and loans receivable are free and clear of any and
all Liens.  None of the obligors on such accounts, notes, or loans receivable
has given notice to a Presidio Party that it will or may refuse to pay the full
amount or any portion thereof.

         5.17    Intangible Property.  There are no material trademarks, trade
names, patents, service marks, brand marks, brand names, computer programs,
databases, industrial designs, copyrights, or other intangible property that
are necessary for the operation, or continued operation, of the business of a
Presidio Party or the ownership and operation, or continued ownership and
operation, of any of their assets, for which such Presidio Party does not hold
valid and continuing authority and consent in connection with the use thereof.

         5.18    Presidio's Title.  The Presidio Parties have Defensible Title 
to the Major Assets.

         5.19    Reserve Report.  The historical production and operating cost
data in respect of the Wells provided in the lease operating statements and
historical oil and gas price information provided in the data room were true
and correct in all material respects.  To the Knowledge of Presidio, the
Reserve Report was prepared in accordance with generally accepted engineering
and evaluation principles and is true and correct as of such date in all
respects to the extent applicable to the business of the Presidio Parties.
Except as set forth in Schedule 5.19, to the Knowledge of Presidio, no fact or
circumstance has occurred since the date of the Reserve Report that results in
any material adverse change, determined in the aggregate and after
consideration of all favorable changes, in the reserves of Presidio as set
forth in the Reserve Report, other than  changes attributable to normal
depletion by subsequent production, general economic conditions in the oil and
gas industry or subsequent drilling, reworking or recompletion activities.
Except as set forth in Schedule 5.19, in all respects, the net revenue
interests and the working interests of the Presidio Parties shown on Exhibit B
hereto are the same net revenue interests and working interests used in the
preparation of the Reserve Report, and the information contained in Exhibit B
regarding payout and similar events that cause adjustments to said net revenue
interests and working interests is the information used in the preparation of
the Reserve Report.  OTHER THAN AS EXPRESSLY SET FORTH ABOVE IN THIS SECTION
5.19, PRESIDIO MAKES NO WARRANTY AND HEREBY DISCLAIMS ANY WARRANTY THAT THE
RESERVE ESTIMATES, CASH FLOW ESTIMATES, PRICE ESTIMATES, OR PRODUCTION OR FLOW
RATE ESTIMATES CONTAINED IN THE RESERVE REPORT OR IN ANY SUPPLEMENT THERETO OR
UPDATE THEREOF ARE IN ANY WAY COMPLETE, ACCURATE OR NOT MISLEADING, THE SAME
BEING PREDICTIONS AS TO FUTURE EVENTS WHICH ARE INHERENTLY SUBJECT TO
INCOMPLETENESS AND INACCURACY.

         5.20    Oil and Gas Operations.  Except as otherwise set forth in
Schedule 5.20:

                 (a)      None of the Wells has been overproduced such that it
         is subject or liable to being shut-in or to any other overproduction
         penalty;





                                      -37-
<PAGE>   80
                 (b)      There have been no changes proposed in the production
         allowables for any Wells;

                 (c)      All Wells have been drilled and (if completed)
         completed, operated, and produced in accordance with good oil and gas
         field practices and in compliance in all material respects with
         applicable oil and gas leases and applicable laws, rules, and
         regulations except where permit applications or requests for
         exceptions are pending;

                 (d)      Proceeds from the sale of oil, gas and other minerals
         produced from the Oil and Gas Assets are being received by the
         applicable Presidio Party in a timely manner and are not being held in
         suspense for any reason, except for (i) amounts held in suspense as of
         the date of this Agreement that individually or in the aggregate are
         not in excess of $100,000, (ii) amounts held in suspense in the
         ordinary course of business after the date of this Agreement, and
         (iii) amounts held in suspense after the date of this Agreement
         because of the occurrence of a Bankruptcy Event or because of concerns
         regarding the financial condition of a Presidio Party;

                 (e)      Except as may be required under any "non-consent"
         penalty, none of the Leases or Wells is subject to any production
         payment or prepayment arrangement arising under any contract for the
         purchase or sale of oil, gas or other minerals to deliver, or to
         suffer the delivery of, any oil, gas or other minerals at some future
         time without then or thereafter receiving full payment therefor;

                 (f)      No person has any call upon, option to purchase or
         similar right to obtain oil, gas or other hydrocarbons production from
         the Oil and Gas Assets other than rights contained in existing
         production sales contracts, call contracts, farmouts, assignments or
         similar contracts;

                 (g)      None of the Presidio Parties are obligated to deliver
         a material quantity of gas to any pipeline or other party as make-up
         for any net under-deliveries of gas from the Oil and Gas Assets for
         transportation, nor is any Presidio Party liable for any material
         scheduling or imbalance penalties or charges imposed by any pipeline
         or other party for transportation of gas produced from any of the Oil
         and Gas Assets;

                 (h)      Subject to Permitted Encumbrances, each of the
         Presidio Parties has the necessary easements and rights-of-way to
         install, maintain, and operate the gathering systems that are owned by
         such Presidio Party as of the date of this Agreement;

                 (i)      As of June 30, 1996, none of the Presidio Parties is
         obligated to deliver any quantity of gas or make any payment by virtue
         of any common law, statutory or contractual balancing arrangement with
         respect to the Oil and Gas Assets; and

                 (j)      Except for monies properly held in suspense, paid
         into escrow, or paid to a Governmental Authority in accordance with
         applicable laws, all royalties, shut-in royalties and similar payments
         payable in connection with the Oil and Gas Assets have been timely





                                      -38-
<PAGE>   81
         paid and in the correct amount.  All delay rental payments payable in
         connection with the Leases have been timely paid and in the correct
         amount, except to the extent that a Presidio Party has determined, in
         the ordinary course of business, not to make such payment.

         5.21    Environmental Matters.  Notwithstanding any other provision of
this Agreement to the contrary, this Section 5.21 contains the exclusive
representations and warranties of Presidio with respect to "Environmental
Matters." Except as set forth in Schedule 5.21:

                 (a)      Each Presidio Party has conducted its business and
         operated its assets, and is conducting its business and operating its
         assets, in material compliance with all applicable Environmental Laws;

                 (b)      To the Knowledge of Presidio, no Presidio Party and
         none of the operations or assets of any Presidio Party are the subject
         of any pending investigation or inquiry by any governmental authority
         evaluating whether any material Environmental Response Action is
         needed to respond to a release of any Environmental Material or to the
         improper storage, generation, transportation, treatment, or disposal
         of any Environmental Material;

                 (c)      No Presidio Party has filed any notice under federal,
         state, or local law indicating that a Presidio Party is responsible
         for the improper release into the environment or the improper storage,
         generation, transportation, treatment, or disposal of any
         Environmental Material;

                 (d)      No Presidio Party has received any claim, complaint,
         notice, inquiry, or request for information, which remains unresolved,
         with respect to any alleged violation of any applicable Environmental
         Law or regarding potential liability under any applicable
         Environmental Law or under any common law theories relating to
         operations or conditions of any facilities or property owned, leased,
         or operated by a Presidio Party;

                 (e)      To the Knowledge of Presidio, no property now or
         previously owned, leased, or operated by a Presidio Party is listed on
         the National Priorities List pursuant to CERCLA or on the CERCLIS or
         on any other similar federal or state list as a site requiring an
         Environmental Response Action;

                 (f)      To the Knowledge of Presidio, there are no sites,
         locations, or operations at which a Presidio Party is now required to
         undertake any material Environmental Response Action under any
         applicable Environmental Law;

                 (g)      To the Knowledge of Presidio, all underground and
         aboveground storage tanks and solid waste disposal facilities owned or
         operated by a Presidio Party are used and operated in material
         compliance with applicable Environmental Laws;

                 (h)      To the Knowledge of Presidio, there are no existing
         financial assurances given by any Presidio Party under any
         Environmental Law that would require monetary funding by a Presidio
         Party after the date of Closing; and





                                      -39-
<PAGE>   82
                 (i)      To the Knowledge of Presidio, there are no claims,
         complaints, notices, inquiries, requests for information, or
         Environmental Response Actions for which the Presidio Parties may be
         responsible that relate to properties, assets, or entities previously
         owned by the Presidio Parties.

         5.22    Brokers.  Except as set forth in Schedule 5.22, no broker,
finder, investment banker, or other similar person is or will be, in connection
with the transactions contemplated by this Agreement, entitled to any
brokerage, finder's, or other similar fee or compensation based on any
arrangement or agreement made by or on behalf of a Presidio Party.

         5.23    Compliance with Law; Governmental Authorizations.  Except as
set forth in Schedule 5.23, the Presidio Parties are not in violation of any
order, injunction, judgment, ruling, law, or regulation of any Governmental
Authority applicable to the property or business of the Presidio Parties.  The
licenses, permits, and other governmental authorizations held by the Presidio
Parties are valid and sufficient for the conduct of the Presidio Parties'
businesses as currently conducted.

         5.24    Insurance.  Schedule 5.24 lists all material insurance
policies covering the Oil and Gas Assets, employees and operations of the
Presidio Parties as of the date of this Agreement.  Such policies are in full
force and effect and except for the bankruptcy proceeding contemplated herein,
to the Knowledge of Presidio, as of the date of this Agreement, there does not
exist any event that, with the giving of notice or the lapse of time, or both,
would constitute a default by a Presidio Party under any such policies.

         5.25    Contracts, Agreements, Commitments and Other Matters.

                 (a)      Schedule 5.25 is a true, correct, and complete list
         of all of the following described items (whether written or oral),
         including all amendments thereto, existing as of the date of this
         Agreement to which any Presidio Party is a party ("Material
         Contracts"):

                          (i)     any note, agreement, mortgage, indenture,
                 security agreement, and other instruments relating to the
                 borrowing of money or evidence of credit for the deferred
                 purchase price of property, or the direct or indirect
                 guarantee by a Presidio Party of any such indebtedness or
                 deferred purchase price in excess of $50,000, in each case
                 other than the Bank Obligations and the Debt Obligations;

                          (ii)    any lease of real property and material
                 personal property providing for annual payments by a Presidio
                 Party under any such lease or group of related leases in
                 excess of $25,000, other than the Oil and Gas Assets;

                          (iii)   any partnership agreement requiring a
                 Presidio Party to make capital contributions or expenditures
                 at an annual rate in excess of $100,000;

                          (iv)    any management, employment, and consulting
                 agreement or other contract for personal services that is not
                 terminable on not more than one month's notice without
                 penalty, in each case other than the Severance Plan and
                 Agreements;





                                      -40-
<PAGE>   83
                          (v)     any agreement providing for severance pay,
                 collective bargaining agreements, labor contracts, or labor or
                 personnel policies, in each case other than the Employee
                 Benefit Plans and the Severance Plan and Agreements;

                          (vi)    any surety, performance and maintenance bond
                 in excess of $50,000;

                          (vii)   any agreement or commitment requiring a
                 Presidio Party to make capital expenditures in excess of
                 $100,000 for any single project, other than customary
                 operating agreements;

                          (viii)  any plan, contract, or arrangement providing
                 for bonuses, pensions, deferred compensation, retirement plan
                 payments, profit sharing, incentive pay, or for any other
                 employee benefit plan, in each case other than the Employee
                 Benefit Plans and the Severance Plan and Agreements;

                          (ix)    other than as set forth in Schedule 5.22, any
                 brokerage or finder's agreement obligating a Presidio Party to
                 make a payment thereunder in excess of $50,000;

                          (x)     any noncompetition agreement (other than
                 areas of mutual interest commonly set forth in operating
                 agreements) that restricts the right of any Presidio Party to
                 engage in any place in any line of business;

                          (xi)    any contract, commitment, or agreement
                 between any of the Presidio Parties or between any  Presidio
                 Party and any Affiliate thereof involving a payment thereunder
                 in excess of $100,000, in each case other than the Bank
                 Obligations, the Debt Obligations, the Employee Benefit Plans
                 and Severance Plan and Agreements;

                          (xii)   any contract (x) for the sale of oil or other
                 liquid hydrocarbons produced or to be produced from the Oil
                 and Gas Assets that is not terminable by a Presidio Party
                 thereto or its respective successor without penalty on no more
                 than ninety (90) days' notice or (y) for the sale of gas
                 produced or to be produced from the Oil and Gas Assets that
                 has a term exceeding six (6) months;

                          (xiii)  any advance payment agreement or any oil and
                 gas balancing agreement, or any other similar agreements,
                 under which a Presidio Party has a net obligation, as of the
                 most recent date available, which shall be no more than ninety
                 (90) days prior to the date of this Agreement, in excess of
                 $50,000 in cash or market value in oil or gas;

                          (xiv)   other than the Bank Obligations and the Debt
                 Obligations, any contract or agreement relating to the Oil and
                 Gas Assets under which a Presidio Party has outstanding
                 indebtedness, obligations or liability for borrowed money, or
                 liability for the deferred purchase price of property,
                 excluding normal trade payables due in





                                      -41-
<PAGE>   84
                 less than ninety (90) days, or has the obligation to incur any
                 such indebtedness, obligation or liability;

                          (xv)    any contract, commitment, or agreement that
                 involves commodity or interest rate swaps, floors, caps,
                 collars, futures, options, or other similar transactions; and

                          (xvi)   any contract, commitment or agreement that
                 involves the disposition of any assets of any Presidio Party
                 having a value of $50,000 or more not entered into in the
                 ordinary course of business consistent with past practice.

                 (b)      Presidio has provided Tom Brown with access to true,
         correct and complete copies of all written Material Contracts and has
         provided Tom Brown with accurate descriptions of all oral Material
         Contracts.

                 (c)      Except with respect to past due accounts payable or
         outstanding indebtedness to the suppliers disclosed in Schedule 5.25
         and as such may be affected by the Reorganization Cases, to the
         Knowledge of Presidio, as of the date of this Agreement, the Presidio
         Parties' relationships are generally satisfactory with their
         respective suppliers who are material to the conducting of their
         respective businesses.

                 (d)      Other than as set forth in Schedule 5.25, as of the
         date of this Agreement, the Presidio Parties do not have outstanding
         any powers of attorney with any person who is not as of the date of
         this Agreement an employee of a Presidio Party, including powers of
         attorney with respect to representation before Governmental Agencies,
         customers, agents, and brokers or given in connection with
         qualification to conduct business in any jurisdiction.

                 (e)      Except as set forth in Schedule 5.25  and as such may
         be affected by the Reorganization Cases, each of the Material
         Contracts to which a Presidio Party is a signatory thereto has been
         duly executed by the applicable Presidio Party thereto and is in full
         force and effect and to the Knowledge of Presidio, as of the date of
         this Agreement, except in respect of the Bank Obligations and the Debt
         Obligations, no Presidio Party is in breach of any such Material
         Contract.

         5.26    Fairness Opinion.  Presidio has received a written opinion
from Jefferies & Company, Inc., a financial advisor to Presidio, to the effect
that the Exchange Consideration to be received pursuant to the Plan of
Reorganization is fair to the Presidio Securityholders, in the aggregate, from
a financial point of view and as of the date of this Agreement such opinion has
not been withdrawn, revoked, or modified.





                                      -42-
<PAGE>   85
                                   ARTICLE VI

                  REPRESENTATIONS AND WARRANTIES OF TOM BROWN

         Tom Brown represents and warrants to Presidio the following:

         6.1     Existence.  Tom Brown is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware, and is
duly qualified to do business as a foreign corporation in the states where the
properties owned or leased by it or the nature of its activities make such
qualification necessary.

         6.2     Authorization and Enforceability.   Tom Brown has the
corporate power to enter into and perform this Agreement and the transactions
contemplated by this Agreement, including the necessary corporate power
regarding the issuance and payment of the Exchange Consideration as
contemplated herein.  The execution, delivery and performance of this
Agreement, and the transactions contemplated hereby, have been duly and validly
authorized by all necessary corporate action on the part of Tom Brown.  This
Agreement constitutes the valid and binding obligations of Tom Brown,
enforceable in accordance with its terms.

         6.3     No Violations.  The execution, delivery and performance of
this Agreement by Tom Brown, and the transactions contemplated by this
Agreement, will not violate (a) any provision of the certificate of
incorporation or bylaws of Tom Brown, (b) any material agreement or instrument
to which Tom Brown is a party or by which Tom Brown or any of its properties
are bound, (c) any judgment, order, ruling, or decree applicable to Tom Brown
as a party in interest, or (d) any law, rule, or regulation applicable to Tom
Brown.

         6.4     Consents and Approvals.  No consent, approval, order, or
authorization of, registration, declaration, or filing with, or permit (other
than any filings required under the 1933 Act, the 1934 Act or the Hart Scott
Act) from any Governmental Authority is required other than Bankruptcy Court
approval by or with respect to Tom Brown in connection with the execution and
delivery of this Agreement by Tom Brown or the consummation by Tom Brown of the
transactions contemplated hereby, except for those expressly contemplated
herein.

         6.5     Tom Brown SEC Documents.  Tom Brown has made available to
Presidio a true and complete copy of the Tom Brown SEC Documents, which are all
the documents (other than preliminary material) that Tom Brown was required to
file with the SEC since January 1, 1995.  As of their respective dates, the Tom
Brown SEC Documents complied in all material respects with the requirements of
the 1933 Act or the 1934 Act, as the case may be, and the rules and regulations
of the SEC promulgated thereunder applicable to such Tom Brown SEC Documents,
and none of the Tom Brown SEC Documents contained any untrue statement of a
material fact or omitted to state a 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.

         6.6     Financial Statements.  The Tom Brown Financial Statements were
prepared in accordance with GAAP applied on a consistent basis during the
periods involved (except as may be





                                      -43-
<PAGE>   86
indicated in the notes thereto or, in the case of unaudited statements, as
permitted by Rule 10-01 of Regulation S-X of the SEC) and fairly present in
accordance with applicable requirements of GAAP (subject, in the case of the
unaudited statements, to normal, recurring adjustments, none of which will be
material) the consolidated financial position of Tom Brown and its consolidated
subsidiaries as of their respective dates and the consolidated results of
operations and the consolidated cash flows of Tom Brown and its consolidated
subsidiaries for the periods presented therein.

         6.7     Capital Structure.

                 (a)      The authorized capital stock of Tom Brown is as set 
         forth in Schedule 6.7.

                 (b)      At the close of business on June 30, 1996, (i) there
         were issued and outstanding 21,124,694 shares of Tom Brown Common
         Stock and (ii) no shares of Tom Brown Common Stock were held by Tom
         Brown as treasury stock.  Except as set forth in this Section 6.7(b)
         or as otherwise disclosed in the Tom Brown SEC Documents or set forth
         in Schedule 6.7, and except for 1,000,000 issued and outstanding
         shares of preferred stock of Tom Brown and options to acquire shares
         of common stock of Tom Brown issued to officers, directors and
         employees of Tom Brown or its subsidiaries (covering not more than
         1,924,800 shares of Tom Brown Common Stock), there are outstanding as
         of the date of this Agreement (i) no shares of capital stock or other
         equity securities of Tom Brown, (ii) no securities of Tom Brown or any
         other person convertible into or exchangeable or exercisable for
         shares of capital stock or other equity securities of Tom Brown, and
         (iii) no subscriptions, options, warrants, calls, or rights (including
         preemptive rights, commitments, understandings, or agreements) to
         which Tom Brown is a party or by which it is bound obligating Tom
         Brown to issue, deliver, sell, purchase, redeem, or acquire shares of
         capital stock or other equity securities of Tom Brown (or securities
         convertible into or exchangeable or exercisable for shares of capital
         stock or other equity securities of Tom Brown) or obligating Tom Brown
         to grant, extend, or enter into any such subscription, option,
         warrant, call, right, commitment, understanding, or agreement.

                 (c)      All outstanding shares of Tom Brown capital stock
         are, and (when issued) the Exchange Common Stock will be, validly
         issued, fully paid, and nonassessable and not subject to any
         preemptive right.

                 (d)      As of the date of this Agreement, there is no
         stockholder agreement, voting trust, or other agreement or
         understanding to which Tom Brown is a party or by which it is bound
         relating to the voting of any shares of the capital stock of Tom Brown
         except as set forth in Schedule 6.7.

         6.8     Claims and Litigation.   Except as set forth in the Tom Brown
SEC Documents or in Schedule 6.8, there is no suit, action, claim, or inquiry
by any person or entity or by any administrative agency or governmental body
and no legal, administrative or arbitration proceeding pending or, to Tom
Brown's knowledge, threatened against Tom Brown or any affiliate of Tom Brown
which has or will materially affect Tom Brown's ability to consummate the
transactions contemplated by this Agreement.





                                      -44-
<PAGE>   87
         6.9     Financing.  Tom Brown has, or has obtained commitments to
obtain, funds or other consideration, as required, sufficient to pay the Cash
Consideration in accordance with this Agreement.  True and complete copies of
such commitments have been furnished to Presidio.


                                  ARTICLE VII

                    NATURE OF REPRESENTATIONS AND WARRANTIES

         7.1     Limited Recourse.  If prior to the Closing, there is
discovered a breach of any of the representations and warranties contained in
Articles V and VI of this Agreement, then the only recourse that a party shall
have for such breach is an exercise of the rights provided in Article X.

         7.2     Nonsurvival of Representations, Warranties, Covenants, and
Agreements.  None of the representations, warranties, covenants, and agreements
contained in this Agreement or in any instrument delivered pursuant to this
Agreement shall survive the Closing, except for the agreements contained in
Sections 4.15, 4.22, 4.23, 4.24, and 4.25 and the agreements delivered pursuant
to Section 4.12.


                                  ARTICLE VIII

                             CONDITIONS TO CLOSING

         8.1     Conditions Precedent to the Obligations of Presidio.  The
obligations of Presidio to consummate the transactions contemplated by this
Agreement are subject to satisfaction at or prior to Closing of each of the
following conditions (any one or more of which may be waived in writing by
Presidio):

                 (a)      The Confirmation Order, in form and substance
         reasonably acceptable to Presidio, confirming the Plan of
         Reorganization shall have been entered by the Bankruptcy Court and the
         Confirmation Order shall have become a Final Order.

                 (b)      The Confirmation Order shall recognize and declare
         Tom Brown as a "successor" to Presidio pursuant to Sections 1125(e)
         and 1145(a)(1) of the Bankruptcy Code.

                 (c)      All Plan Documents and other applicable corporate
         documents necessary or appropriate to the implementation of the Plan
         of Reorganization shall have been executed, delivered, and where
         applicable, filed with the appropriate Governmental Authorities.

                 (d)      On the Closing Date, each of the representations and
         warranties of Tom Brown contained in this Agreement shall be true and
         correct in all material respects at and as of such time; and on the
         Closing Date Tom Brown shall deliver to Presidio a certificate to such
         effect signed by an authorized officer of Tom Brown, except that such
         certificate may





                                      -45-
<PAGE>   88
         state that the information provided therein is given to the best
         information, knowledge, and belief of the authorized representative
         signing the same.

                 (e)      Each of the obligations of Tom Brown to be performed
         on or before the Closing Date pursuant to the terms of this Agreement
         shall have been duly performed in all material respects on the Closing
         Date; and on the Closing Date Tom Brown shall have delivered to
         Presidio a certificate to such effect signed by an authorized officer
         of Tom Brown, except that such certificate may state that the
         information provided therein is given to the best information,
         knowledge, and belief of the authorized representative signing the
         same.

                 (f)      The necessary and material consents and approvals of
         all Governmental Authorities and others shall have been obtained and
         remain in effect, and all required waiting periods under the Hart
         Scott Act and the rules and regulations promulgated thereunder
         relating to this Agreement and the transactions contemplated hereby
         shall have expired.

                 (g)      No Governmental Authority shall have issued an
         injunction, order, decree, or ruling or taken any other action
         restraining or preventing the consummation of the transactions
         contemplated hereby that shall not have been vacated, withdrawn,
         cancelled, or otherwise voided.

                 (h)      The Exchange Common Stock shall have been authorized
         for listing on NASDAQ, subject only to official notice of issuance.

                 (i)      The written opinion of Presidio's financial advisors
         referred to in Section 5.26 shall have been reconfirmed in writing as
         of the Closing Date as if given as of such date and shall not have
         been withdrawn or revoked or modified in any material respect.

                 (j)      The New D&O Insurance shall be in full force and 
         effect.

         8.2     Conditions Precedent to the Obligations of Tom Brown.  The
obligations of Tom Brown to consummate the transactions contemplated by this
Agreement are subject to satisfaction at or prior to Closing of the following
conditions (any one or more of which may be waived in writing by Tom Brown):

                 (a)      The Confirmation Order, in form and substance
         reasonably acceptable to Tom Brown, confirming the Plan of
         Reorganization shall have been entered by the Bankruptcy Court and the
         Confirmation Order shall have become a Final Order.

                 (b)      The Confirmation Order shall recognize and declare
         Tom Brown as a "successor" to Presidio pursuant to Sections 1125(e)
         and 1145(a)(1) of the Bankruptcy Code.

                 (c)      All Plan Documents and other applicable corporate
         documents necessary or appropriate to the implementation of the Plan
         of Reorganization shall have been executed, delivered, and where
         applicable, filed with the appropriate Governmental Authorities.





                                      -46-
<PAGE>   89
                 (d)      On the Closing Date, each of the representations and
         warranties of Presidio contained in this Agreement shall be true and
         correct in all material respects at and as of such time and each of
         the obligations of Presidio to be performed on or before the Closing
         Date pursuant to the terms of this Agreement shall have been duly
         performed in all material respects on the Closing Date, except to the
         extent that any such breach or failure to perform does not give rise
         to the right of Tom Brown to terminate this Agreement pursuant to
         clause (iii) of Section 9.1(c).  On the Closing Date Presidio shall
         have delivered to Tom Brown a certificate regarding such
         representations, warranties and obligations signed by an authorized
         representative of Presidio, except that such certificate may state
         that the information provided therein is given to the best
         information, knowledge, and belief of the authorized representative
         signing the same.

                 (e)      The necessary and material consents and approvals of
         all Governmental Authorities, the Presidio Securityholders (to the
         extent required under the Plan of Reorganization or applicable law)
         and others shall have been obtained and remain in effect, and all
         required waiting periods under the Hart Scott Act and the rules and
         regulations promulgated thereunder relating to this Agreement and the
         transactions contemplated hereby shall have expired.

                 (f)      No Governmental Authority shall have issued an
         injunction, order, decree, or ruling or taken any other action
         restraining or preventing the consummation of the transactions
         contemplated hereby, that shall not have been vacated, withdrawn,
         cancelled, or otherwise voided.

                 (g)      This Agreement and all other agreements and letter
         agreements contemplated under this Agreement or otherwise entered into
         between Tom Brown or any Affiliate of Tom Brown and Presidio or any
         Affiliate of Presidio in connection with the transactions contemplated
         by this Agreement shall have been assumed in their entirety and
         without modification thereto (except to the extent such modification
         shall have been consented to in writing by Tom Brown) pursuant to
         Section 365 or Section 1123(b)(2), as applicable, of the Bankruptcy
         Code on or before the Confirmation Date.

                 (h)      On the Closing Date, none of the Major Assets shall
         be subject to any Liens other than (i) Permitted Encumbrances and (ii)
         Liens arising through Tom Brown or as a result of Tom Brown's actions.

                 (i)      The Plan of Reorganization and the Confirmation Order
         shall provide that as of the Closing Date each of the Presidio Parties
         and their respective creditors and holders of equity interests (the
         "Releasing Parties") will be deemed to forever release, waive and
         discharge, and to be enjoined from asserting, to the fullest extent
         permitted under applicable law, all claims (as defined in Section
         101(5) of the Bankruptcy Code), demands, debts, rights, causes of
         action, and liabilities (collectively, the "Released Claims") in
         connection with or related to this Agreement, the Reorganization
         Cases, the Presidio Parties, or the Plan of Reorganization whether
         such Released Claims are liquidated or unliquidated, fixed or
         contingent, matured or unmatured, known or unknown, foreseen or
         unforeseen, then existing





                                      -47-
<PAGE>   90
         or thereafter arising, that are based in whole or in part on any act,
         omission, or other occurrence taking place on or prior to the Closing
         Date and that may be asserted by or on behalf of the Releasing Parties
         against Tom Brown or its respective agents, advisors, attorneys and
         representatives (including current and former directors, officers,
         employees, members and professionals) acting in such capacity.

                 (j)      Presidio shall, upon application or motion therefor
         filed with the Bankruptcy Court, have obtained a Final Order (which
         may be a part of the Confirmation Order) authorizing the assumption by
         the applicable Presidio Party under Section 365 or Section 1123(b)(2)
         of the Bankruptcy Code of the Designated Contracts and such Final
         Order shall provide (as contemplated in the Plan of Reorganization)
         that (i) the mere occurrence of a Bankruptcy Event (which for purposes
         of this Section 8.2(j) shall include Presidio West Virginia) and (ii)
         the insolvency or financial condition of a Presidio Party prior to the
         Closing, shall not constitute a basis for the removal of a Presidio
         Party as operator under any of the Designated Contracts.

                 (k)      The Bar Date Order, in a form and substance
         reasonably acceptable to Tom Brown, shall have been entered by the
         Bankruptcy Court and shall have become a Final Order.


                                   ARTICLE IX

                                  TERMINATION

         9.1     Termination Rights.  This Agreement may be terminated and the
Exchange may be abandoned at any time prior to the Closing (provided that the
right of Tom Brown to terminate pursuant to clause (iii) of Section 9.1(c)
shall not be exercisable by Tom Brown subsequent to the fifth day following the
date on which the Confirmation Order becomes a Final Order), whether before or
after the approval of the Exchange or Plan of Reorganization by the Presidio
Securityholders as follows:

                 (a)      By mutual written consent of Tom Brown and Presidio;

                 (b)      By either Tom Brown or Presidio if:

                          (i)     the Closing has not occurred on or before the
                 first anniversary of the commencement of Presidio's
                 Reorganization Case (provided, however, that the right to
                 terminate this Agreement pursuant to this clause (i) shall not
                 be available to any party whose breach of this Agreement has
                 been the cause of or resulted in the failure of the Closing to
                 occur on or before such date); or

                          (ii)    any Governmental Authority shall have issued
                 an injunction, order, decree, or ruling or taken any other
                 action restraining or preventing the





                                      -48-
<PAGE>   91
                 consummation of the transactions contemplated by this
                 Agreement and such order, decree, ruling, or other action
                 shall have become final and non-appealable;

                 (c)      By Tom Brown if:

                          (i)     the board of directors of Presidio shall fail
                 to recommend approval of the Exchange at the time the
                 Disclosure Statement is first mailed to the Presidio
                 Securityholders or if such recommendation of approval, if
                 made, is amended in a manner adverse to Tom Brown or withdrawn
                 thereafter or if Presidio elects not to consummate the
                 Exchange as a result of the condition set forth in Section
                 8.1(i) not having been satisfied;

                          (ii)    Presidio has notified Tom Brown that it is
                 prepared to enter into a binding agreement to effect an
                 Alternative Transaction described in Section 4.20(c);

                          (iii)   (x) there has been one or more breaches of
                 the representations and warranties made by Presidio in Article
                 V of this Agreement or a failure of Presidio to perform or
                 comply with one or more covenants or agreements contained in
                 this Agreement, (y) Tom Brown has given Presidio written
                 notice of the existence of each such breach or failure at
                 least ten (10) business days prior to the then scheduled
                 Confirmation Date and such breach or failure is not resolved
                 or cured on or before the Confirmation Date and (z) if the
                 Exchange were to be consummated without such breaches or
                 failures (individually or together with any other breaches or
                 failures) being so resolved or cured and, as a result thereof,
                 such breach or failure would cause Tom Brown to suffer or
                 sustain damages in an amount greater than $3,000,000, (for
                 purposes of this clause (iii), the amount of damages that
                 would be suffered or sustained by Tom Brown shall be
                 calculated (1) after taking into consideration and reducing
                 (to the extent that such have not previously been considered
                 in determining the existence of such breach or failure) such
                 damages for (A) amounts that have been reimbursed or paid
                 under insurance coverage maintained by the Presidio Parties or
                 any other person or amounts as to which an insurance company
                 or other insuring entity has acknowledged its obligation to
                 reimburse or pay and (B) the amount of any reserves
                 established in the Presidio Financial Statements for the
                 Liability or event giving rise to damages and (2) by netting
                 against the aggregate of all such damages (A) the amount by
                 which (I) the actual recovery (through the date of any such
                 determination of aggregate damages) of accounts receivable
                 reflected on the balance sheet forming a part of the Presidio
                 Financial Statements exceeds (II) the stated value of such
                 accounts receivable on such balance sheet, and (B) the amount
                 by which (I) any Liability reflected on such balance sheet
                 exceeds (II) the amount for which such Liability is liquidated
                 prior to the date of any such determination of aggregate
                 damages);

                          (iv)    INTENTIONALLY LEFT BLANK;





                                      -49-
<PAGE>   92
                          (v)     the Tom Brown Trading Value is more than 120%
                 of the Common Share Value; provided, however, Tom Brown shall
                 not have the right to terminate this Agreement pursuant to
                 this clause (v) if prior to the Closing Date Presidio elects
                 to reduce the number of shares of Exchange Common Stock to a
                 number of shares equal to the quotient obtained by dividing
                 (A) the Aggregate Common Share Value by (B) 120% of the Common
                 Share Value;

                          (vi)    the Initial Order (A) shall not have been
                 entered within fifteen (15) business days after the occurrence
                 of a Bankruptcy Event and (B) shall not have become a Final
                 Order within twenty-five (25) business days after a Bankruptcy
                 Event; or

                          (vii)   the Confirmation Order, in form and substance
                 reasonably acceptable to Tom Brown and confirming the Plan of
                 Reorganization, shall not have been entered by the Bankruptcy
                 Court on or before November 15, 1996 or the Confirmation Order
                 shall not have become a Final Order on or before December 13,
                 1996 (as either of such dates shall be extended by the number
                 of days, if any, that Presidio's solicitation of the
                 acceptance by the Presidio Securityholders of the Plan of
                 Reorganization may be delayed or extended by reason of (x) any
                 material change in or material events regarding Tom Brown and
                 which occur after the date of this Agreement and which are
                 required to be disclosed in the Disclosure Statement or in any
                 amendment or supplement to the Disclosure Statement or (y) the
                 providing of any additional disclosure concerning Tom Brown or
                 concerning the post-Closing business or financial condition of
                 any Presidio Party); provided, that Tom Brown shall not be
                 entitled to terminate this Agreement pursuant to this clause
                 (vii) unless Tom Brown has given Presidio prior written notice
                 of its intention to terminate this Agreement pursuant to this
                 clause (vii) within thirty (30) days after the above
                 applicable described date; or

                          (viii)  the Reorganization Cases shall not have been 
                 commenced on or before August 6, 1996.

                          (d)     By Presidio if:

                          (i)     there has been a breach of the
                 representations and warranties made by Tom Brown in Article VI
                 of this Agreement which is material to the financial condition
                 of Tom Brown or its ability to perform its obligations under
                 this Agreement or which adversely affects the benefits to be
                 received by Presidio under this Agreement at Closing or a
                 failure to perform or comply with any covenant or agreement
                 contained in this Agreement which adversely affects Presidio
                 or its ability to obtain the benefits contemplated by this
                 Agreement or which adversely affects the benefits to be
                 received by Presidio under this Agreement at Closing; provided
                 that Presidio shall not be entitled to terminate this
                 Agreement pursuant to this clause (i) unless (A) Presidio has
                 given Tom Brown written notice of the existence of such





                                      -50-
<PAGE>   93
                 breach or failure and (B) Tom Brown has not resolved or cured
                 such breach or failure within ten (10) days of such notice;

                          (ii)    Presidio has notified Tom Brown that Presidio
                 is prepared to enter into a binding definitive agreement to
                 effect an Alternative Transaction described in Section
                 4.20(c);

                          (iii)   the Tom Brown Trading Value is less than 80%
                 of the Common Share Value; provided, however, Presidio shall
                 not have the right to terminate this Agreement pursuant to
                 this clause (iii) if prior to the Closing Date Tom Brown
                 elects to increase the number of shares of Exchange Common
                 Stock to a number of shares equal to the quotient obtained by
                 dividing (A) the Aggregate Common Share Value by (B) 80% of
                 the Common Share Value; or

                          (iv)    Presidio has notified Tom Brown that the
                 board of directors of Presidio, in the exercise of their
                 fiduciary duties, has determined not to recommend or to
                 withdraw their prior recommendation of the Exchange to the
                 Presidio Securityholders or if Presidio elects not to
                 consummate the Exchange as a result of the condition set forth
                 in Section 8.1(i) not having been satisfied.

         9.2     Payment of Termination Expenses and Fee.

                 (a)      If this Agreement is terminated pursuant to either
         clause (i) or (ii) of Section 9.1(c) or clauses (ii) or (iv) of
         Section 9.1(d), then Presidio shall pay Tom Brown an amount equal to
         $6,000,000 (the "Termination Fee").

                 (b)      If this Agreement is terminated pursuant to either
         clauses (i), (ii), (iii) or (vi) of Section 9.1(c) or clauses (ii) or
         (iv) of Section 9.1(d), then Presidio shall pay Tom Brown an amount
         equal to the documented out-of-pocket costs and expenses (including
         attorneys', financial advisors', accountants', engineers' and other
         consultants' fees) incurred by Tom Brown from and after November 15,
         1995 (the "Termination Expenses") in connection with (x) the
         preparation, negotiation of the Plan of Reorganization, the Disclosure
         Statement and this Agreement, (y) the due diligence efforts of Tom
         Brown and their professionals and advisors in connection with the
         contemplated transactions and (z) the pursuit of the transactions
         contemplated hereby and thereby; provided, however, that the
         aggregated amount of Termination Expenses that Tom Brown shall be
         entitled to recoup herein shall not exceed $3,000,000.

                 (c)      Subject to the approval of the Bankruptcy Court, the
         Termination Expenses and Termination Fee shall constitute first
         priority administrative expenses of Presidio pursuant to section
         364(c)(1) of the Bankruptcy Code and shall be secured by a lien on
         property of the Presidio estate pursuant to section 364(c)(2) of the
         Bankruptcy Code and shall be paid upon the earlier of (i) the closing
         of the transactions contemplated by an accepted Alternative
         Transaction and (ii) entry of any order of the Bankruptcy Court
         directing payment by Presidio of such amounts.  From and after a
         termination by Presidio





                                      -51-
<PAGE>   94
         pursuant to Section 9.1(d)(ii) until payment in full of the
         Termination Fee and the Termination Expenses, interest shall accrue on
         any unpaid portion of the Termination Fee and the Termination Expenses
         at a rate per annum equal to the prime commercial lending rate
         announced from time to time by the Chase Manhattan Bank, N.A.

                 (d)      If the Initial Order has not been entered by the
         Bankruptcy Court as contemplated in Section 4.5(c), then Tom Brown
         shall be entitled to assert as liquidated damages the Termination Fee
         and the Termination Expenses as a claim under section 502 and/or
         503(b) of the Bankruptcy Code.

         9.3     Effect of Termination.   If this Agreement is terminated
pursuant to Section 9.1, this Agreement shall become void and of no further
force or effect (except for the provisions of Sections 4.14 and 9.2 which shall
continue in full force and effect).


                                   ARTICLE X

                                 MISCELLANEOUS

         10.1    Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original instrument, but all
such counterparts together shall constitute but one agreement.

         10.2    Notice.  All notices which are required or may be given
pursuant to this Agreement shall be sufficient in all respects if given in
writing and delivered personally, by telecopy or by registered or certified
mail, postage prepaid, as follows:

         IF TO PRESIDIO PARTIES:

                 Presidio Oil Company
                 5613 DTC Parkway, Suite 750
                 P.O. Box 6525
                 Englewood, Colorado 80155-6525
                 Attention: Robert L. Smith
                 Telephone:       (303) 773-0100
                 Fax:             (303) 850-1111





                                      -52-
<PAGE>   95
                 IF TO TOM BROWN:

                 Tom Brown, Inc.
                 508 West Wall, Suite 500
                 Midland, Texas 79702
                 Attention:       Donald L. Evans
                 Telephone:       (915) 682-9715
                 Fax:             (915) 683-9327

All notices shall be deemed to have been duly given at the time of receipt by
the party to which such notice is addressed.

         10.3    Governing Law.   THIS AGREEMENT AND THE LEGAL RELATIONS
BETWEEN THE PARTIES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF TEXAS WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS
OTHERWISE APPLICABLE TO SUCH DETERMINATIONS.

         10.4    Captions.  The captions in this Agreement are for convenience
only and shall not be considered a part of or affect the construction or
interpretation of any provision of this Agreement.

         10.5    Assignment.  No party shall assign all or any part of this
Agreement, nor shall any party assign or delegate any of its rights or duties
hereunder, without the prior written consent of the other party and any
assignment made without such consent shall be void.  Subject to the preceding
sentence, this Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns.

         10.6    Entire Agreement; Third Party Beneficiaries.  This Agreement
(together with the Confidentiality Agreement and the documents and instruments
delivered by the parties in connection with this Agreement) (a) constitutes the
entire agreement and supersedes all other prior agreements and understandings,
both written or oral, among the parties with respect to the subject matter
hereof and (b) except for Sections 4.15, 4.22, 4.24 and 4.25, is solely for the
benefit of the parties hereto and their respective successors, legal
representatives, and assigns and does not confer on any other person any rights
or remedies hereunder.  The provisions of Sections 4.15, 4.22, 4.24 and 4.25
are intended to be for the benefit of, and shall be enforceable by, the parties
hereto and each of the other parties who are beneficiaries of the rights and
obligations arising thereunder and their respective heirs and representatives.

         10.7    Amendment.

                 (a)      At any time prior to the Closing Date this Agreement
         may be amended or modified in any respect by the parties by an 
         agreement in writing executed in the same manner as this Agreement.





                                      -53-
<PAGE>   96
                 (b)      No supplement, modification, waiver or termination of
         this Agreement shall be binding unless executed in writing by the
         party to be bound thereby.

         10.8    Exhibits and Schedules.  All Exhibits and Schedules attached
to or referred to in this Agreement are incorporated into and made a part of
this Agreement.

         10.9    Severability.  Any term or provision of this Agreement that is
invalid or unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the remaining terms and provisions of this
Agreement or affecting the validity or enforceability of any of the terms or
provisions of this Agreement in any other jurisdiction.  If any provision of
this Agreement is so broad as to be unenforceable, such provision shall be
interpreted to be only so broad as is enforceable.





                                      -54-
<PAGE>   97
         IN WITNESS WHEREO, this Agreement has been signed by each of the
parties hereto, all as of the date above written.


<TABLE>
<S>                                                      <C>
                                                         PRESIDIO OIL COMPANY

                                                         By:                                                 
                                                            -------------------------------------------------
                                                         Name:                                               
                                                              -----------------------------------------------
                                                         Title:                                              
                                                               ----------------------------------------------


                                                         PRESIDIO EXPLORATION, INC.

                                                         By:                                                 
                                                            -------------------------------------------------
                                                         Name:                                               
                                                              -----------------------------------------------
                                                         Title:                                              
                                                         ----------------------------------------------
                                                         
                                                         PRESIDIO WEST VIRGINIA, INC.

                                                         By:                                                 
                                                            -------------------------------------------------
                                                         Name:                                               
                                                              -----------------------------------------------
                                                         Title:                                              
                                                               ----------------------------------------------

                                                         PALISADE OIL, INC.

                                                         By:                                                 
                                                            -------------------------------------------------
                                                         Name:                                               
                                                              -----------------------------------------------
                                                         Title:                                              
                                                               ----------------------------------------------

                                                         TOM BROWN, INC.

                                                         By:                                                 
                                                            -------------------------------------------------
                                                         Name:                                               
                                                              -----------------------------------------------
                                                         Title:                                              
                                                               ----------------------------------------------
</TABLE>





                                      -55-

<PAGE>   1

                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.


FIRST:  The name of the Corporation is Tom Brown, Inc.

SECOND:  The address of its registered office in the State of Delaware is 1209
Orange Street, in the City of Wilmington, County of New Castle 19801.  The name
of its registered agent at such address is The Corporation Trust Company.

THIRD:  The nature of the business of the Corporation and the objects and
purposes and business thereof proposed to be transacted, promoted or carried on
are as follows:

         To transact any and all lawful act or activity for which a corporation
         may be incorporated under the laws of the State of Delaware.

FOURTH:  The total number of shares of all classes that the Corporation shall
have authority to issue is 250,000,000, of which 50,000,000 shares shall be
Preferred Stock, par value $.10 per share, and 200,000,000 shares shall be
Common Stock, $.10 par value per share.  All of such shares shall, upon
issuance thereof, be fully paid and nonassessable.

         The designations, preferences, limitations and relative rights of the
shares of each class that the Corporation shall have authority to issue are as
follows:

         A.      Preferred Stock.  The Board of Directors is hereby expressly
                 vested with the authority to adopt a resolution or resolutions
                 providing for the issue of authorized but unissued shares of
                 Preferred Stock, which shares may be issued from time to time
                 in one or more series and in such amounts as may be determined
                 by the Board of Directors in such resolution or resolutions.
                 The designations, preferences, limitations or relative rights
                 of the Preferred Stock and the qualifications, limitations or
                 restrictions, if any, of such preferences and/or rights
                 (collectively, the "Series Terms") may vary between series in
                 any and all respects and shall be such as are stated and
                 expressed in a resolution or resolutions providing for the
                 creation or revision of such Series Terms set forth in a
                 Certificate of Designations (a "Preferred Stock Series
                 Resolution") adopted by the Board of Directors; provided that
                 all shares of any one series of Preferred Stock so designated
                 by the Board of Directors shall be identical in all respects
                 except that shares of any one series issued at different times
                 may differ as to the dates from which dividends thereon may be
                 cumulative.  The powers of the Board of Directors with respect
                 to the Series Terms of a particular series shall include, but
                 not be limited to, determination of the following:
<PAGE>   2

                 1.  The right to receive dividends, if any, and the rate,
                     dates, terms and other conditions on which such dividends 
                     shall be payable;
                     
                 2.  The nature of the dividend payable, if any, with respect 
                     to shares of such series as cumulative, noncumulative or 
                     partially cumulative;
                     
                 3.  The redemption rights of such series including the price 
                     at and the terms and conditions on which such shares may 
                     be redeemed;
                     
                 4.  The amount payable upon shares in the event of involuntary
                     liquidation;
                     
                 5.  The amount payable upon shares in the event of voluntary 
                     liquidation;
                     
                 6.  Sinking fund provisions for the redemption or purchase of 
                     shares;
                     
                 7.  The terms and conditions on which shares may be converted,
                     if the shares of any series are issued with the privilege 
                     of conversion;
                     
                 8.  Voting rights, if any; and
                     
                 9.  Repurchase obligations of the Corporation with respect to 
                     the shares of each series.

                 Any of the Series Terms, including voting rights, of any
                 series may be made dependent upon facts ascertainable outside
                 this Certificate of Incorporation and the Preferred Stock
                 Series Resolution, provided that the manner in which such
                 facts shall operate upon such Series Terms is clearly and
                 expressly set forth herein or in the Preferred Stock Series
                 Resolution.

                 Subject to the provisions of this Paragraph Fourth, shares of
                 one or more series of Preferred Stock may be authorized or
                 issued from time to time as shall be determined by and for
                 such consideration as shall be fixed by the Board of
                 Directors, in an aggregate amount not exceeding the total
                 number of shares of Preferred Stock authorized herein.  Except
                 in respect of Series Terms fixed by the Board of Directors as
                 permitted hereby, all shares of Preferred Stock shall be of
                 equal rank and shall be identical.

         B.     Common Stock.

                 1.  Dividends.  Subject to the provisions of any Preferred 
                     Stock Series Resolution, the Board of Directors may, in 
                     its discretion, out of funds
                     




                                       2
<PAGE>   3
                     legally available for the payment of dividends and at such
                     times and in such manner as determined by the Board of 
                     Directors, declare and pay dividends on the Common Stock 
                     of the Corporation.

                     No dividend (other than a dividend in capital stock
                     ranking on a parity with the Common Stock or cash in lieu
                     of fractional shares with respect to such stock dividend)
                     shall be declared or paid on any share or shares of any
                     class of stock or series thereof ranking on a parity with
                     the Common Stock in respect of payment of dividends for
                     any dividend period unless there shall have been declared,
                     for the same dividend period, like proportionate dividends
                     on all shares of Common Stock then outstanding.
        
                 2.  Liquidation.  In the event of any liquidation, dissolution
                     or winding up of the Corporation, whether voluntary or
                     involuntary, after payment or provision for payment of the
                     debts and other liabilities of the Corporation and after
                     payment of any preferential amount due to the holders of
                     any other class or series of stock, the holders of the
                     Common Stock shall be entitled to receive ratably any or
                     all assets remaining to be paid or distributed.
        
                 3.  Voting Rights.  Subject to any special voting rights set
                     forth in any Preferred Stock Series Resolution, the
                     holders of the Common Stock of the Corporation shall be
                     entitled at all meetings of shareholders to one vote for
                     each share of such stock held by them.
        
         C.      Prior, Parity or Junior Stock.  Whenever reference is made in
                 this Paragraph Fourth or in any Preferred Stock Series
                 Resolution to shares "ranking prior to" another class or
                 series of stock or "on a parity with" another class or series
                 of stock, such reference shall mean and include all other
                 shares of the Corporation in respect of which the rights of
                 the holders thereof as to the payment of dividends or as to
                 distributions in the event of a voluntary or involuntary
                 liquidation, dissolution or winding up of the affairs of the
                 Corporation are given preference over, or rank on an equality
                 with, as the case may be, the rights of the holders of such
                 other class or series of stock.  Whenever reference is made to
                 shares "ranking junior to" another class of stock, such
                 reference shall mean and include all shares of the Corporation
                 in respect of which the rights of the holders thereof as to
                 the payment of dividends and as to distributions in the event
                 of a voluntary or involuntary liquidation, dissolution or
                 winding up of the affairs of





                                       3
<PAGE>   4
                 the Corporation are junior and subordinate to the rights of the
                 holders of such class or series of stock.

                 Except as otherwise provided herein or in any Preferred Stock
                 Series Resolution, each series of Preferred Stock ranks on a
                 parity with each other series and each series ranks prior to
                 the Common Stock.  Common Stock ranks junior to the Preferred
                 Stock.

         D.      Liquidation.  For the purposes of Section (2) of Section B of
                 this Paragraph Fourth and for the purpose of the comparable
                 sections of any Preferred Stock Series Resolution, the merger
                 or consolidation of the Corporation into or with any other
                 corporation, or the merger of any other corporation into it,
                 or the sale, lease or conveyance of all or substantially all
                 the assets, property or business of the Corporation, shall not
                 be deemed to be a liquidation, dissolution or winding up of
                 the Corporation.

         E.      Reservation and Retirement of Shares.  The Corporation shall
                 at all times reserve and keep available, out of its authorized
                 but unissued shares of Common Stock or out of shares of Common
                 Stock held in its treasury, the full number of shares of
                 Common Stock into which all shares of any series of Preferred
                 Stock having conversion privileges from time to time
                 outstanding are convertible.

                 Unless otherwise provided in a Preferred Stock Series
                 Resolution with respect to a particular series of Preferred
                 Stock, all shares of Preferred Stock redeemed or acquired (as
                 a result of conversion or otherwise) shall be retired and
                 restored to the status of authorized but unissued shares.

         F.      Preemptive Rights.

                 1.  No holder of shares of Preferred Stock or Common Stock of 
                     the Corporation shall have any preemptive right to
                     purchase or subscribe for or receive any shares of any
                     class, or series thereof, of stock of the Corporation,
                     whether now or hereafter authorized, or any warrants,
                     options, bonds, debentures or other securities convertible
                     into, exchangeable for or carrying any right to purchase
                     any shares of any class, or series thereof, of stock; but
                     such additional shares of stock and such warrants,
                     options, bonds, debentures or other securities convertible
                     into, exchangeable for or carrying any right to purchase
                     any shares of any class, or series thereof, of stock may
                     be issued or disposed of by the Board of Directors to such
                     persons, and on such terms and for such lawful
        




                                       4
<PAGE>   5
                     consideration, as in its discretion it shall deem 
                     advisable.

                 2.  The stockholders of the Corporation shall have no
                     rights to acquire the shares of Common Stock of the
                     Corporation now held in the treasury of the Corporation or
                     any shares of Common Stock of the Corporation hereafter
                     acquired by the Corporation and held as treasury shares.
        
         G.      No Cumulative Voting.  Cumulative voting shall not be allowed
                 in the election of Directors or for any other purpose.

         H.      Repurchases of Capital Stock.  The Corporation may, without
                 shareholder approval, purchase, directly or indirectly, its
                 own shares to the extent permitted by the Delaware General
                 Corporation Law.

FIFTH:   The names and mailing address of the incorporators are:

<TABLE>
<CAPTION>
                 Name                               Address
                 ----                               -------
           <S>                                 <C>
           Thomas C. Brown                     500 Empire Plaza
                                               Midland, Texas 79701

           Donald L. Evans                     500 Empire Plaza
                                               Midland, Texas 79701
</TABLE>

SIXTH:  The name and mailing addresses of the persons who are to serve as
directors until the first annual meeting of stockholders or until their
successors are duly elected and qualified are:

<TABLE>
<CAPTION>
                      Name                               Address
                      ----                               -------
               <S>                         <C>
               Thomas C. Brown             500 Empire Plaza
                                           Midland, Texas 79701

               Donald L. Evans             500 Empire Plaza
                                           Midland, Texas 79701

               Joe G. Roper                5609 West Industrial
                                             Boulevard
                                           Midland, Texas 79701
</TABLE>

SEVENTH:  The Corporation is to have perpetual existence.

EIGHTH:  The Board of Directors shall have power to enact, alter, amend and
repeal bylaws not inconsistent with the laws of the State of Delaware and this
Certificate of Incorporation.

NINTH:  Limitation of Certain Liability of Directors.  A director of the
Corporation shall not be personally liable to the Corporation or its
stockholders for monetary damages for breach of





                                       5
<PAGE>   6
fiduciary duty as a director, except for liability (i) for any breach of the
director's duty of loyalty to the Corporation or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or
a knowing violation of law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit.  In addition to the circumstances in which a
director of the Corporation is not personally liable as set forth in the
preceding sentence, a director shall not be liable to the fullest extent
permitted by any amendment to the Delaware General Corporation law hereafter
enacted that further limits the liability of a director.

         Any repeal or modification of the foregoing paragraph by the
stockholders of the Corporation shall not adversely affect any right or
protection of a director of the Corporation with respect to any matter
occurring or any cause of action, suit or claim that, but for this Article
Ninth, would accrue or arise, prior to the time of such repeal or modification.

TENTH:  Indemnification and Insurance.

         A.      Right to Indemnification.  Each person who was or is made a
                 party or is threatened to be made a party to or is involved in
                 any action, suit or proceeding, whether civil, criminal,
                 administrative or investigative (hereinafter a "proceeding"),
                 by reason of the fact that he or she, or a person of whom he
                 or she is the legal representative, is or was a director or
                 officer, of the Corporation or is or was serving at the
                 request of the Corporation as a director, officer, employee or
                 agent of another corporation or of a partnership, joint
                 venture, trust or other enterprise, including service with
                 respect to employee benefit plans, whether the basis of such
                 proceeding is alleged action in an official capacity as a
                 director, officer, employee or agent or in any other capacity
                 while serving as a director, officer, employee or agent, shall
                 be indemnified and held harmless by the Corporation to the
                 fullest extent authorized by the Delaware General Corporation
                 Law, as the same exists or may hereafter be amended (but, in
                 the case of any such amendment, only to the extent that such
                 amendment permits the Corporation to provide broader
                 indemnification rights than said law permitted the Corporation
                 to provide prior to such amendment), against all expense,
                 liability and loss (including attorneys' fees, judgments,
                 fines, ERISA excise taxes or penalties and amounts paid or to
                 be paid in settlement) reasonably incurred or suffered by such
                 person in connection therewith and such indemnification shall
                 continue as to a person who has ceased to be a director,
                 officer, employee or agent and shall inure to the benefit of
                 his or her heirs, executors and administrators; provided,
                 however, that, except as provided in paragraph (b) hereof, the
                 Corporation shall





                                       6
<PAGE>   7
                 indemnify any such person seeking indemnification in
                 connection with a proceeding (or part thereof) initiated by
                 such person only if such proceeding (or part thereof) was
                 authorized by the board of directors of the Corporation.  The
                 right to indemnification conferred in this Section shall be a
                 contract right and shall include the right to be paid by the
                 Corporation the expenses incurred in defending any such
                 proceeding in advance of its final disposition; provided,
                 however, that, if the Delaware General Corporation Law
                 requires, the payment of such expenses incurred by a director
                 or officer in his or her capacity as a director of officer
                 (and not in any other capacity in which service was or is
                 rendered by such person while a director or officer,
                 including, without limitation, service to an employee benefit
                 plan) in advance of the final disposition of a proceeding,
                 shall be made only upon delivery to the Corporation of an
                 undertaking, by or on behalf of such director or officer, to
                 repay all amounts so advanced if it shall ultimately be
                 determined that such director or officer is not entitled to be
                 indemnified under this Paragraph A or otherwise.  The
                 Corporation may, by action of its Board of Directors, provide
                 indemnification to employees and agents of the Corporation
                 with the same scope and effect as the foregoing
                 indemnification of directors and officers.
        
         B.      Right of Claimant to Bring Suit.  If a claim under Paragraph A
                 of this Paragraph Tenth is not paid in full by the Corporation
                 within ninety days after a written claim has been received by
                 the Corporation, the claimant may at any time thereafter bring
                 suit against the Corporation to recover the unpaid amount of
                 the claim and, if successful in whole or in part, the claimant
                 shall be entitled to be paid also the expense of prosecuting
                 such claim.  It shall be a defense to any such action (other
                 than an action brought to enforce a claim for expenses
                 incurred in defending any proceeding in advance of its final
                 disposition where the required undertaking, if any is
                 required, has been tendered to the Corporation) that the
                 claimant has not met the standards of conduct which make it
                 permissible under the Delaware General Corporation Law for the
                 Corporation to indemnify the claimant for the amount claimed,
                 but the burden of proving such defense shall be on the
                 Corporation.  Neither the failure of the Corporation
                 (including its Board of Directors, independent legal counsel,
                 or its stockholders) to have made a determination prior to the
                 commencement of such action that indemnification of the
                 claimant is proper in the circumstances because he or she has
                 met the applicable standard of conduct set forth in the
                 Delaware General Corporation Law, nor an actual determination
                 by the Corporation (including its Board of Directors,
                 independent legal counsel, or its





                                       7
<PAGE>   8
                 stockholders) that the claimant has not met such applicable
                 standard or conduct, shall be a defense to the action or
                 create a presumption that the claimant has not met the
                 applicable standard of conduct.
        
          C.     Non-Exclusivity of Rights.  The right to indemnification and
                 the payment of expenses incurred in defending a  proceeding in
                 advance of its final disposition conferred in this Paragraph
                 shall not be exclusive of any other right which any person may
                 have or hereafter acquire under any statute, provision of the
                 Certificate of Incorporation, bylaw, agreement, vote of
                 stockholders or disinterested directors or otherwise.

          D.     Insurance.  The Corporation may maintain insurance, at its
                 expense, to protect itself and any director, officer, employee
                 or agent of the Corporation or another corporation,
                 partnership, joint venture, trust or other enterprise against
                 any such expense, liability  or loss, whether or not the
                 Corporation would have the power to indemnify such person
                 against such expense, liability or loss under the Delaware
                 General Corporation Law.

ELEVENTH:  The Corporation reserves the right to amend, alter, change or repeal
any provision contained in this Certificate of Incorporation, in the manner now
or hereafter prescribed by statute, and all rights conferred upon stockholders
herein are granted subject to this reservation.

         WE, THE UNDERSIGNED, being each of the incorporators hereinbefore
named, for the purpose of forming a corporation pursuant to the General
Corporation Law of the State of Delaware,  do make this certificate, hereby
declaring and certifying that this is our act and deed and the facts herein
stated are true, and accordingly, have hereunto set our hands this 25th day of
February, 1987.


                                        /s/ Thomas C. Brown
                                        ------------------------------
                                        Thomas C. Brown


                                        /s/ Donald L. Evans
                                        ------------------------------
                                        Donald L. Evans







                                       8
<PAGE>   9

                                TOM BROWN, INC.
                    CERTIFICATE OF DESIGNATIONS, PREFERENCES
                     AND RIGHTS OF SERIAL PREFERRED STOCK -
                       SERIES A NON-VOTING CONVERTIBLE 6%
                           CUMULATIVE PREFERRED STOCK


         The undersigned, President and Secretary, respectively, of Tom Brown,
Inc., a Delaware corporation (the "Company"), certify that pursuant to
authority granted to and vested in the Board of Directors of the Company by
provisions of the Certificate of Incorporation of the Company, the Board of
Directors has duly adopted the following resolutions creating a series of
serial preferred stock of the Company designated as the Series A Non-Voting
Convertible 6% Cumulative Preferred Stock:

         "RESOLVED, That the Board of Directors of Tom Brown, Inc.  (the
         "Company"), in the exercise of its best business judgment and
         intending to act in full compliance with the applicable provisions of
         the Company's Certificate of Incorporation and Bylaws and the
         provisions of the Delaware General Corporation Law, hereby establishes
         a series of Preferred Stock, par value $0.10 per share, of the Company
         designated as "Series A Non-Voting Convertible 6% Cumulative Preferred
         Stock" (the "Series A Shares"), and the number of Series A Shares
         which the Company is authorized to issue from time to time shall be
         22,000,000 and the designations, preferences, limitations, and
         relative rights, and qualifications, limitations and restrictions, of
         the Series A Shares shall be as follows:

         1.      Liquidation.  The Series A Shares shall be preferred as to
         assets over Junior Shares so that, in the event of the voluntary or
         involuntary liquidation, dissolution or winding up of the Company, the
         holders of the Series A Shares shall be entitled, in conjunction with
         any provision then being made for the holders of Parity Shares, if
         any, to have set apart for them or to be paid out of the assets of the
         Company, after payment or provision for payment of the debts and other
         liabilities of the Company and after provision for the holders of
         Senior Shares, if any, but before any distribution is made to or set
         apart for the holders of Junior Shares, an amount in cash equal to
         $1.1364 per Series A Share (as adjusted for any stock split, reverse
         stock split, stock dividend or similar event resulting in a change in
         the Series A Shares) (the "Liquidation Value"), together with all
         dividends accrued on such Series A Shares to the date of payment,
         irrespective of whether such dividends were earned, declared or
         legally available, and the holders of the Series A Shares shall not be
         entitled to any further payment in connection with the voluntary or
         involuntary liquidation, dissolution or winding up of the Company
<PAGE>   10
         except as expressly provided for in this resolution.  If, upon such
         liquidation, dissolution or winding up of the Company, the assets of
         the Company available for distribution to the holders of the Series A
         Shares and the holders of Parity Shares, if any, shall be insufficient
         to permit the distribution in full of the amounts receivable as
         aforesaid by the holders of the Series A Shares and the amounts
         receivable by the holders of Parity Shares, if any, then all such
         assets of the Company shall be distributed ratably among the holders
         of the Series A Shares and the holders of Parity Shares, if any, in
         proportion to the amounts that each would have been entitled to
         receive if such assets were sufficient to permit distribution in full
         as aforesaid.  Neither the consolidation or merger of the Company with
         or into any corporation or corporations, nor the sale, lease or
         transfer by the Company of all or any part of its assets, nor the
         reduction of the authorized or issued shares of the Company of any
         class, whether now or hereafter authorized, shall be deemed to be a
         liquidation, dissolution or winding up of the Company for the purposes
         of this Section 1.  Written notice of any voluntary or involuntary
         liquidation, dissolution or winding up of the Company, setting the
         payment date and the place where the amounts to be distributed shall
         be paid and containing a reference to the conversion option granted by
         Section 2 hereof, shall be given not less than thirty (30) days prior
         to the payment date stated therein to the holders of record of the
         Series A Shares at their respective addresses as the same shall appear
         on the stock ledger of the Company.

         2.      Conversion.

                 (a)  Subject to the terms and conditions of this Section 2,
         the Series A Shares shall be convertible, at any time and from time to
         time, at the option of the holder thereof, into Common Shares by
         surrender of the certificate or certificates for the Series A Shares
         to be so converted, duly endorsed, at the principal office of the
         Company (or at such other place or places as may be designated by the
         Company from time to time by notice sent to the holders of the Series
         A Shares at their respective addresses as the same shall appear on the
         stock ledger of the Company) or at the corporate trust office of any
         transfer agent for the Series A Shares at any time during normal
         business hours, together with notice that the holder elects to convert
         such Series A Shares, or a stated number of such shares, in accordance
         with the provisions of this Section 2.  Such notice shall also state
         the name or names (with addresses) in which the certificate or
         certificates for Common Shares shall





                                       2
<PAGE>   11
         be issued.  The number of Common Shares that any such holder shall
         receive in return for each Series A Share converted by such holder
         shall be computed by dividing (x) $1.1364 (as adjusted for any stock
         split, reverse stock split, stock dividend or similar event resulting
         in a change in the Series A Shares) by (y) the Conversion Price then
         in effect.

                 (b) As promptly as practicable after exercise by any holder of
         Series A Shares of such holder's option to convert Series A Shares
         pursuant to the provisions of this Section 2, the Company shall
         deliver or cause to be delivered to or upon the written order of such
         holder one or more certificates representing the number of Common
         Shares issuable upon such conversion, issued in such name or names as
         such holder may direct, together with, if the certificate or
         certificates surrendered evidence a greater number of Series A Shares
         than the number of Series A Shares to be converted, one or more
         certificates evidencing the Series A Shares not to be converted,
         issued in such name or names as such holder may direct, and
         accompanied by any cash in respect of any fractional interest in a
         Common Share issuable upon such conversion.  Each such conversion
         shall be deemed to have been made immediately prior to the close of
         business on the day the option to convert is exercised, and all rights
         of the converting holder as the holder of the Series A Shares
         surrendered for conversion shall cease at such time and the person or
         persons in whose name or names the certificate or certificates for the
         Common Shares issuable upon conversion are to be issued shall be
         treated for all purposes as having become the record holder or holders
         thereof at such time, except that, if the date of exercise of the
         conversion option is a date when the stock ledger of the Company is
         closed, such person or persons shall be deemed to have become the
         holder or holders of such shares at the close of business on the next
         succeeding date on which the stock ledger is open.

                 (c)  The initial Conversion Price shall be $0.2841.  The
         Conversion Price shall be subject to adjustment as follows:

                          A.  If the Company shall pay a dividend or make any
                 other distribution to all holders of the Common Shares payable
                 in Common Shares or shall subdivide its outstanding Common
                 Shares into a greater number of shares, the Conversion Price
                 in effect immediately prior thereto shall be proportionately
                 reduced, and if the Company shall combine its outstanding





                                       3
<PAGE>   12
                 Common Shares into a smaller number of shares, the Conversion
                 Price in effect immediately prior thereto shall be
                 proportionately increased. An adjustment made pursuant to this
                 subdivision A shall become effective as of the date the record
                 is taken for such dividend or distribution or such subdivision
                 or combination or, if no record is taken, the date as of which
                 the record holders of Common Shares entitled to such payment
                 or other distribution or to participate in such subdivision or
                 combination are determined.
        
                          B.  If on or after December 24, 1986, the Company
                 issues or sells, or in accordance with subdivision C below is
                 deemed to have issued or sold, any Common Shares (other than
                 (i) Common Shares issued or sold pursuant to the exercise of
                 options, warrants or rights outstanding as of December 24,
                 1986, (ii) by reason of the grant of options under the Tom
                 Brown, Inc. Incentive Stock Option Plan, to purchase up to a
                 total of 600,000 Common Shares (as adjusted pursuant to the
                 provisions of the plan designed to protect against dilution)
                 at a per share purchase price of not less than 100% of the
                 fair market value of a Common Share on the date of grant and
                 Common Shares issued or sold pursuant to the exercise of such
                 options, (iii) issuances or sales of Common Shares for which
                 an adjustment of the Conversion Price is made pursuant to
                 subdivision A above, or (iv) pursuant to transactions for
                 which appropriate provision is made pursuant to Section 2(d)
                 or 2(e) hereof) for a consideration per share less than the
                 Conversion Price or the Market Price, as the case may be, in
                 effect immediately prior to such time, then forthwith upon
                 such issuance or sale the Conversion Price shall be adjusted
                 to that Conversion Price determined by multiplying the
                 Conversion Price then in effect by a fraction (1) the
                 numerator of which shall be the number of Common Shares
                 outstanding immediately prior to the issuance or sale of such
                 additional Common Shares plus the number of Common Shares
                 which the aggregate consideration received by the Company for
                 the total number of Common Shares so issued or sold would
                 purchase at the Conversion Price or the Market Price, as the
                 case may be, in effect immediately before such





                                       4
<PAGE>   13
                 adjustment, and (2) the denominator of which shall be the
                 number of Common Shares outstanding immediately after the
                 issuance or sale of such Common Shares.
        
                          C.  For the purposes of determining the adjusted
                 Conversion Price under subdivision B above, the following
                 shall be applicable:

                                  (i) If on or after December 24, 1986, the
                          Company in any manner grants any right or option to
                          subscribe for or to purchase Common Shares or any
                          stock or other securities convertible into or
                          exchangeable for Common Shares (such rights or
                          options being herein called "Options" and such
                          convertible or exchangeable stock or securities being
                          herein called "Convertible Securities") and the
                          lowest price per share for which any one Common Share
                          is issuable upon the exercise of any such Option or
                          upon conversion or exchange of any such Convertible
                          Security is less than the Conversion Price or the
                          Market Price, as the case may be, in effect
                          immediately prior to the time of the granting of such
                          Option, then the Conversion Price shall be adjusted
                          as provided in subdivision B above on the basis that
                          the maximum number of Common Shares issuable upon the
                          exercise of all such Options and upon conversion or
                          exchange of all such Convertible Securities shall be
                          deemed to have been issued as of the date of such
                          grant and the aggregate consideration for such
                          maximum number of additional Common Shares shall be
                          deemed to be the minimum consideration received or
                          receivable by the Company (if any) upon the issuance
                          of such additional Common Shares on the exercise of
                          the Options or the conversion or exchange of the
                          Convertible Securities.  For the purposes of this
                          paragraph (i), the "lowest price per share for which
                          any one Common Share is issuable" shall be equal to
                          the sum of the lowest amounts of consideration (if
                          any) received or receivable by the Company with
                          respect to any one Common Share upon the granting of
                          the Option, upon the exercise of the Option, and upon





                                       5
<PAGE>   14
                          the conversion or exchange of the Convertible
                          Security.  No further adjustment of the Conversion
                          Price shall be made upon the actual issue of such
                          Common Shares or of such Convertible Securities upon
                          the exercise of such Option or upon the actual issue
                          of such Common Shares upon conversion or exchange of
                          such Convertible Securities.
        
                                  (ii) If on or after December 24, 1986, the
                          Company in any manner issues or sells any Convertible
                          Security and the lowest price per share for which any
                          one Common Share is issuable upon conversion or
                          exchange thereof is less than the Conversion Price or
                          the Market Price, as the case may be, in effect
                          immediately prior to the time of such issuance or
                          sale, then the Conversion Price shall be adjusted as
                          provided in subdivision B above on the basis that the
                          maximum number of Common Shares issuable upon
                          conversion or exchange of all such Convertible
                          Securities shall be deemed to have been issued as of
                          the date of such issue or sale and the aggregate
                          consideration for such maximum number of additional
                          Common Shares shall be deemed to be the minimum
                          consideration received or receivable by the Company
                          (if any) upon the issuance of such additional Common
                          Shares or the issuance or sale of such Convertible
                          Securities and the conversion or exchange thereof.
                          For the purposes of this paragraph (ii), the "lowest
                          price per share for which any one Common Share is
                          issuable" shall be equal to the sum of the lowest
                          amounts of consideration (if any) received or
                          receivable by the Company with respect to any one
                          Common Share upon the issuance or sale of such
                          Convertible Security and upon the conversion or
                          exchange of such Convertible Security.  No further
                          adjustment of the Conversion Price shall be made upon
                          the actual issue of such Common Shares upon
                          conversion or exchange of such Convertible Security,
                          and if any such issue or sale of such Convertible
                          Security is made upon exercise of any Options for
                          which adjustments of the





                                       6
<PAGE>   15
                          Conversion Price had been or are to be made pursuant
                          to other provisions of this subdivision C, no further
                          adjustment of the Conversion Price shall be made by
                          reason of such issue or sale.
        
                                  (iii) If the purchase price provided for in
                          any Option, the additional consideration (if any)
                          payable upon the issue, conversion or exchange of any
                          Convertible Security, or the rate at which any
                          Convertible Security is convertible into or
                          exchangeable for Common Shares changes at any time,
                          the Conversion Price in effect at the time of such
                          change shall be readjusted to the Conversion Price
                          that would have been in effect at such time had such
                          Option or Convertible Security originally provided
                          for such changed purchase price, changed additional
                          consideration or changed conversion rate, as the case
                          may be, at the time initially granted, issued or
                          sold; provided, however, that if such adjustment of
                          the Conversion Price shall result in an increase in
                          the Conversion Price then in effect, such adjustment
                          shall not be effective until thirty (30) days after
                          notice thereof has been given to all holders of the
                          Series A Shares at their respective addresses as the
                          same shall appear on the stock ledger of the Company.

                                  (iv) Upon the expiration of any Option or the
                          termination of any right to convert or exchange any
                          Convertible Security without the exercise of any such
                          Option or right, the Conversion Price then in effect
                          shall be adjusted to the Conversion Price that would
                          have been in effect at the time of such expiration or
                          termination had such Option or Convertible Security,
                          to the extent outstanding immediately prior to such
                          expiration or termination, never been issued;
                          provided, however, that if the Company shall
                          accelerate the expiration of any Option or the
                          termination of any right to convert or exchange any
                          Convertible Security, such adjustment shall not be
                          effective until thirty (30)





                                       7
<PAGE>   16
                          days after notice of such acceleration has been given
                          to all holders of the Series A Shares.
        
                                  (v) If any Common Share, Option or
                          Convertible Security is issued or sold or deemed to
                          have been issued or sold for cash, the consideration
                          received therefor shall be deemed to be the amount
                          received by the Company therefor, without deduction
                          therefrom of any expenses incurred or any
                          underwriting commissions or concessions paid or
                          allowed by the Company in connection therewith.
                          Except as provided below in this subdivision (v), in
                          case any Common Share, Option or Convertible Security
                          is issued or sold or deemed to have been issued or
                          sold for a consideration other than cash, the amount
                          of the consideration other than cash received by the
                          Company shall be the fair value of such
                          consideration, determined in good faith by the Board
                          of Directors of the Company, except where such
                          consideration consists of securities, in which case
                          the amount of consideration received by the Company
                          shall be the Market Price thereof as of the date of
                          receipt, but in each such case without deduction of
                          any expenses incurred or any underwriting commission
                          or concessions paid or allowed by the Company in
                          connection therewith.  In computing the Market Price
                          of a note or other obligation that is not listed on
                          any securities exchange or quoted in the NASDAQ
                          System or for which market quotations are not
                          otherwise readily available, the total consideration
                          to be received by the Company thereunder (including
                          interest) shall be discounted to present value at the
                          prime rate of interest of InterFirst Bank Dallas,
                          N.A., (or its successor in interest) in effect at the
                          time the note or obligation is deemed to have been
                          issued.  If any Common Share, Option or Convertible
                          Security is issued in connection with any merger in
                          which the Company is the surviving corporation, the
                          amount of consideration therefor will be deemed to be
                          the fair value, as determined in good





                                       8
<PAGE>   17
                          faith by the Board of Directors, of such portion of
                          the net assets and business of the nonsurviving
                          corporation as is attributable to such Common Share,
                          Option or Convertible Security, as the case may be. 
                          If any Common Share, Option or Convertible Security
                          is issued in payment or satisfaction of any dividend
                          upon any class of stock other than Common Shares, the
                          amount of consideration therefor will be deemed to be
                          equal to the amount of such dividend so paid or
                          satisfied.
        
                                  (vi) In case any Option is issued in
                          connection with the issue or sale of other securities
                          of the Company, together comprising one integrated
                          transaction in which no specific consideration is
                          allocated to such Option by the parties thereto, the
                          Option shall be deemed to have been granted for
                          consideration of $0.01.

                                  (vii) If the purchase price provided for in
                          any option, warrant or right referred to in clause
                          (i) or (ii) of the parenthetical in subdivision B
                          above shall change at any time (other than by reason
                          of the provisions designed to protect against
                          dilution), then such change shall be deemed the
                          issuance of a new Option as of the date of such
                          change for the purposes of said subdivision B.

                 (d) If the Company shall distribute (pursuant to a dividend or
         otherwise) to all holders of the Common Shares shares of its capital
         stock (other than Common Shares), evidences of indebtedness, assets or
         other property (excluding dividends payable in cash out of surplus
         (determined in accordance with generally accepted accounting
         principles, consistently applied)), or options, warrants or rights to
         subscribe for or to purchase securities of the Company or other
         property, then, in each such case, appropriate provision shall be made
         (without any adjustment of the Conversion Price) to ensure that the
         holder of each Series A Share then outstanding shall have the right to
         receive, upon conversion of such Series A Share, with respect to the
         Common Shares such holder shall receive upon conversion and in
         addition thereto and without payment of any consideration therefor,
         such capital stock, evidences of indebtedness, assets or other
         property, or such options,





                                       9
<PAGE>   18
         warrants or rights, that such holder would have received upon such
         distribution had such holder been the holder of record of the number
         of Common Shares into which such Series A Share could have been
         converted immediately prior to such distribution on the date on which
         the record was taken for such distribution, or, if no record was
         taken, the date as of which the record holders of Common Shares
         entitled to such distribution were determined.

                 (e) In case of (i) any reclassification or change of the
         outstanding Common Shares (other than a change in par value, or from
         par value to no par value, or from no par value to par value, or a
         change in the Common Shares as a result of a subdivision or
         combination for which an adjustment of the Conversion Price is made
         pursuant to subdivision A of Section 2(c), or (ii) any consolidation
         or merger of the Company or any Subsidiary with or into another
         entity, or (iii) any sale or conveyance to another corporation of the
         assets of the Company as an entirety or substantially as an entirety,
         as a result of which in any such case the holders of all the Common
         Shares are entitled to receive (either directly or upon subsequent
         liquidation pursuant to a plan of liquidation adopted in connection
         with such transaction) stock or other securities or property with
         respect to or in exchange for the Common Shares, then, in each such
         case, without any adjustment of the Conversion Price, effective as of
         the effective time of any such reclassification, change,
         consolidation, merger, sale or conveyance, as the case may be, the
         holder of each Series A Share then outstanding shall have the right to
         receive or acquire, upon conversion of such Series A Share, in lieu of
         or in addition to the Common Shares theretofore receivable upon such
         conversion, the kind and amount of shares of stock and other
         securities and property receivable upon such reclassification, change,
         consolidation, merger, sale or conveyance by a holder of the number of
         Common Shares into which such Series A Share could have been converted
         immediately prior to such reclassification, change, consolidation,
         merger, sale or conveyance.  The Company shall not effect any such
         consolidation, merger, sale or conveyance unless prior to or
         simultaneously with the consummation thereof the successor corporation
         (if other than the Company) resulting from such consolidation or
         merger or the entity purchasing such assets assumes by written
         instrument (in form reasonably satisfactory to the holders of a
         majority of the Series A Shares then outstanding) the obligation to
         deliver to each such holder such shares of stock or other securities
         or property as, in accordance with the foregoing provisions of this
         subsection (e), such holder may be entitled to





                                       10
<PAGE>   19
         receive or acquire.  In each such case, appropriate adjustments shall
         be made in the application of the provisions of this Section 2 with
         respect to the rights and interests thereafter of the holders of the
         Series A Shares, to the end that the provisions of this Section 2
         shall thereafter be applicable, as nearly as reasonably may be, to the
         stock or other securities or property thereafter deliverable in lieu
         of Common Shares upon the conversion of Series A Shares.  The
         provisions of this subsection (e) shall similarly apply to successive
         reclassifications, changes, consolidations, mergers, sales and
         conveyances.  If the occurrence of any one event shall give rise to an
         adjustment under both this subsection (e) and Section 2(d) hereof,
         then the terms of this subsection (e) shall control.

                 (f) If on or after December 24, 1986, the Company shall take
         any action affecting the Common Shares, other than an action described
         in subsections (c), (d) or (e) above, which, in the opinion of the
         Board of Directors of the Company, would have a material adverse
         effect upon the conversion option granted by this Section 2, the
         Conversion Price shall be adjusted in such manner and at such time as
         the Board may in good faith determine to be equitable in the
         circumstances.

                 (g) Except as otherwise provided in this Section 2, if an
         adjustment to the Conversion Price is required under more than one
         subsection or subdivision of this Section 2, then the Conversion Price
         shall be adjusted in the manner provided herein which will result in
         the greater reduction in the Conversion Price.

                 (h) Any determination as to fair value or as to whether any
         adjustment (including an adjustment of the Conversion Price) is
         required hereunder, or as to the amount of any such adjustment, if
         required, shall be binding upon the holders of the Series A Shares and
         the Company if made in good faith by the Board of Directors of the
         Company.

                 (i) Whenever the Conversion Price is adjusted as provided in
         this Section 2, then, in each such case, the Company shall notify the
         transfer agent, if any, for the Series A Shares and shall promptly
         give to the holders of the Series A Shares who are holders of record
         not more than fifteen (15) days before the date such notice is given,
         a notice stating (i) the event requiring the adjustment, (ii) the
         method by which the adjustment was calculated (including a description
         of the basis on which the Board of Directors of the Company made any
         determination hereunder), and (iii) the adjusted





                                       11
<PAGE>   20
         Conversion Price then and thereafter effective under this Section 2.
         An affidavit of the transfer agent for the Series A Shares or of the
         Secretary of the Company that any such notice has been given shall, in
         the absence of fraud, be prima facie evidence of the facts stated
         therein.

                 (j)  In case at any time:

                          (i) the Board of Directors of the Company shall
                 declare a dividend (or any other distribution) on the Common
                 Shares; or

                          (ii) the Board of Directors of the Company shall
                 authorize the granting to all holders of the Common Shares of
                 options, warrants or rights to subscribe for or to purchase
                 any shares of stock of any class or of any other options,
                 warrants or rights; or

                          (iii) the Board of Directors of the Company shall
                 authorize any reclassification of the Common Shares, any
                 consolidation or merger of the Company or any Subsidiary with
                 or into another corporation, or the sale or conveyance of all
                 or a substantial portion of the assets of the Company; or

                          (iv) the Board of Directors of the Company shall
                 authorize the voluntary liquidation, dissolution or winding up
                 of the Company;

         then the Company shall cause to be given to each holder of Series A
         Shares, as promptly as possible but in any event at least twenty (20)
         days (sixty (60) days in the case of any merger or consolidation to
         which the Company or any Subsidiary is a party or the sale or
         conveyance of all or a substantial portion of the Company's assets)
         prior to the applicable date hereinafter specified, a notice stating
         (1) the date on which a record is to be taken for the purposes of such
         dividend, distribution or granting of options, warrants or rights, or,
         if a record is not to be taken, the date as of which the holders of
         Common Shares of record to be entitled to such dividend, distribution
         or options, warrants or rights are to be determined, or (2) the date
         on which such reclassification, consolidation, merger, sale,
         conveyance, liquidation, dissolution or winding up is expected to
         become effective, the terms of such transaction, and the date as of
         which it is expected that holders of Common Shares of record shall be
         entitled to exchange their





                                       12
<PAGE>   21
         Common Shares for securities or other property deliverable upon such
         reclassification, consolidation, merger, sale, conveyance,
         liquidation, dissolution or winding up.  Failure to give any such
         notice or any defect therein shall not affect the validity of the
         proceedings referred to in clauses (i), (ii), (iii) and (iv) above.
         Nothing contained in this subsection (j) shall be deemed to adversely
         affect the rights of the holders of the Series A Shares, under the
         Delaware General Corporation Law or under the Certificate of
         Incorporation of the Company, to be given notice of, or to vote upon,
         a proposal to effect any transaction described in this subsection (j).

                 (k) No fractional Common Shares shall be issued upon the
         conversion of Series A Shares.  If more than one Series A Share shall
         be surrendered for conversion at one time by the same holder, the
         number of full Common Shares issuable upon conversion thereof shall be
         computed on the basis of the aggregate number of Series A Shares so
         surrendered.  If any fractional interest in a Common Share would,
         except for the provisions of this subsection (k), be deliverable upon
         the conversion of any Series A Share or Shares, the Company shall, in
         lieu of delivering the fractional share therefor, pay to the holder of
         such surrendered Series A Share or Shares an amount in cash (computed
         to the nearest cent) equal to such fractional interest multiplied by
         the Market Price of a Common Share as of the close of business on the
         date of conversion.

                 (l) The Company shall as promptly as practicable seek the
         approval of its shareholders to cause its Certificate of Incorporation
         to be amended to increase the number of authorized Common Shares to a
         number sufficient to permit the conversion of all outstanding Series A
         Shares from time to time as necessary under the circumstances.  Upon
         any issuance of Series A Shares, the Company shall reserve a number of
         Common Shares sufficient to permit conversion of all of such Series A
         Shares at such time; provided, however, that if and to the extent the
         number of authorized Common Shares is not then sufficient to permit
         conversion of all then issued Series A Shares, all then authorized but
         unissued Common Shares which are not otherwise reserved shall be
         reserved for purposes of permitting conversion of a portion of such
         Series A Shares and after approval by the Company's shareholders of an
         amendment to the Company's Certificate of Incorporation increasing the
         number of authorized Common Shares, the Company shall reserve such
         number of newly authorized Common Shares so as to permit, immediately
         following such approval, the conversion of all such Series A Shares,
         and thereafter the Company





                                       13
<PAGE>   22
         shall at all times have reserved and available out of its authorized
         but unissued Common Shares solely for the purpose of issue upon
         conversion of the Series A Shares, as provided in this Section 2, such
         number of Common Shares as shall from time to time be sufficient to
         permit the conversion of all outstanding Series A Shares.  Upon the
         issuance thereof upon conversion, all in accordance with the
         provisions of this Section 2, such Common Shares shall be validly
         issued, fully paid and nonassessable.  Series A Shares converted
         pursuant to this Section 2 shall be cancelled and shall not be
         reissued.  Upon any conversion, no adjustment shall be made for
         dividends on the Common Shares payable to holders of record of Common
         Shares on a date prior to the date of such conversion.

                 (m) The issuance of certificates for Common Shares shall be
         made without charge for any tax in respect of such issuance.  However,
         if any such certificate is to be issued in the name other than that of
         the holder of the converted Series A Shares, the Company shall not be
         required to issue or deliver any certificate or certificates unless
         (i) the holder has paid to the Company the amount of any tax that may
         be payable in respect of any transfer involved in such issuance or
         shall establish to the satisfaction of the Company that such tax has
         been paid and (ii) the certificate for the Series A Shares surrendered
         for conversion shall be duly endorsed or accompanied by a duly
         executed stock power.

                 (n) If the issuance of any Common Shares upon the conversion
         of Series A Shares requires approval of or by any securities exchange
         before such shares may be issued, and the Company determines to secure
         such approval, then the Company may suspend the conversion of all
         Series A Shares for the period during which it is endeavoring to
         secure such approval.

                 3.  Voting Rights.  The holders of the Series A Shares shall
         not have, and shall not be entitled to exercise, exercise, any voting
         rights with respect to the Series A Shares, except for such voting
         rights which such holders may be entitled to exercise as holders of a
         class or series of capital stock of the Company pursuant to, under or
         in accordance with specific provisions of the Delaware General
         Corporation Law.

                 4.       Dividends.

                 (a) The holders of the Series A Shares shall be entitled to
         receive out of funds legally available therefor, cumulative cash
         dividends at the rate of 6% per annum of the Liquidation Value per
         Series A Share





                                       14
<PAGE>   23
         ($1.1364, as adjusted for any stock split, reverse stock split, stock
         dividend or similar event resulting in a change in the Series A
         Shares) (the "Dividend Rate"), payable on June 30 of each year in
         which any Series A Shares shall be outstanding, commencing June 30,
         1987, to the holders of record of such Series A Shares on the
         respective dates fixed for such purpose by the Board of Directors of
         the Company in advance of payment of each dividend.  Dividends on each
         Series A Share shall be cumulative from the date of issue thereof.
         The first dividend payable with respect to any Series A Share shall be
         computed by multiplying the Dividend Rate by a fraction of which (i)
         the numerator shall be the number of days from the date of issue of
         such Series A Share through the date as of which such first dividend
         is payable, inclusive, and (ii) the denominator shall be 360.

                 (b) All other equity securities of the Company, including,
         without limitation, the Senior Shares, if any, and the Junior Shares,
         if any, shall rank junior to the Series A Shares in the payment of
         dividends.

                 (c) To the extent any dividend accrues on a Series A Share,
         and is not fully paid in the manner specified in Section 4(a) hereof,
         such dividend (or, if paid in part, the unpaid portion thereof) shall
         be added to the Liquidation Value of such Series A Share and shall
         remain a part of such Liquidation Value until such dividend (or unpaid
         portion thereof) is paid. In addition, any such unpaid dividend shall
         not result in an adjustment to the Conversion Price, and any such
         unpaid dividend shall no longer be payable to a holder of such Series
         A Share upon the effective date of the conversion thereof into Common
         Shares.

                 (d) If at any time the Company pays less than the total amount
         of dividends then accrued and payable with respect to the Series A
         Shares, such payment shall be distributed ratably among the holders of
         the Series A Shares based upon the aggregate Liquidation Value of the
         Series A Shares then held by each such holder.

                 (e) So long as any Series A Shares shall remain outstanding,
         no dividend whatsoever (other than a dividend payable in Common
         Shares) shall be declared or paid on any Junior Shares, nor shall any
         Junior Shares be redeemed or purchased by the Company or any
         Subsidiary thereof, nor shall any monies be paid to or made available
         for a sinking fund for the redemption or purchase of any Junior
         Shares, unless in each such instance full dividends on all outstanding
         Series A





                                       15
<PAGE>   24
         Shares for all past dividend periods and the dividend on all
         outstanding Series A Shares for the then current dividend period shall
         have been paid and sufficient funds set apart therefor.

         5.      Definitions.

                 (a) As used herein, the following terms shall have the
         meanings specified in the sections listed below:

<TABLE>
<CAPTION>
        Term                                               Section
        ----                                               -------
        <S>                                                <C>
        Company                                            Preamble

        Conversion Price                                   2(c)

        Convertible Securities                             2(c)C(i)

        Liquidation Value                                  1

        Options                                            2(c)C(i)

        Series A Shares                                    Preamble
</TABLE>

                 (b) As used herein, the following terms shall have the
         following meanings:

                 "Common Shares" shall mean and include the shares of Common
         Stock, par value $0.10 per share, of the Company as constituted on the
         date of the original issue of the Series A Shares and shall also
         include any class of shares of capital stock of the Company thereafter
         authorized that shall not be limited to a fixed sum or percentage in
         respect of the right of the holders thereof to receive dividends or to
         participate in the assets of the Company distributable to shareholders
         upon any liquidation, dissolution or winding up of the Company;
         provided, however, that the shares into which the Series A Shares
         shall be convertible pursuant to Section 2 hereof shall mean and
         include, and, as used in Section 2 hereof, the term "Common Shares"
         shall mean and include, only the Common Stock, par value $0.10 per
         share, of the Company as constituted on the date of the original issue
         of the Series A Shares or (i) in the case of any reclassification,
         change, consolidation, merger, sale or conveyance of the character
         referred to in Section 2(e) hereof, the shares or other securities or
         property deliverable in lieu thereof or (ii) in the case of any change
         or reclassification of the outstanding Common Shares issuable upon
         conversion of the Series A Shares as a result of a subdivision or
         combination or consisting of a change in par value, or from par value
         to no par value,





                                       16
<PAGE>   25
         or from no par value to par value, such Common Shares as so changed or
         reclassified.

                 "Junior Shares" shall mean (i) Common Shares and (ii) all
         those classes and series of preferred or special shares which, by the
         terms of the Certificate of Incorporation of the Company, shall be
         subordinate to the Series A Shares with respect to the right of the
         holders thereof to participate in the assets of the Company
         distributable to shareholders upon any liquidation, dissolution or
         winding up of the Company.

                 "Market Price" of any security shall mean the average of the
         closing prices of such security's sales on all securities exchanges on
         which such security may at the time be listed, or, if there have been
         no sales on any such exchange on any day, the average of the highest
         bid and lowest asked prices on all such exchanges at the end of such
         date, or, if on any day such security is not so listed, the average of
         the representative bid and asked prices quoted in the NASDAQ System as
         of 4:00 p.m., New York time, or, if on any day such security is not
         quoted in the NASDAQ System, the average of the high and low bid and
         asked prices on such day in the domestic over-the-counter market as
         reported by the National Quotation Bureau, Inc., or any similar
         successor organization, in each such case averaged over a period of 21
         days consisting of the day as of which "Market Price" is being
         determined and the 20 consecutive business days prior to such date.
         If at any time such security is not listed on any securities exchange
         or quoted in the NASDAQ System or the over-the-counter market, the
         "Market Price" of such security shall be the fair value thereof
         determined in good faith by the Board of Directors of the Company.

                 "Parity Shares" shall mean all those classes and series of
         preferred or special shares which, by the terms of the Certificate of
         Incorporation of the Company, shall be on a parity with the Series A
         Shares with respect to the right of the holders thereof to participate
         in the assets of the Company distributable to shareholders upon any
         liquidation, dissolution or winding up of the Company.

                 "Senior Shares" shall mean all those classes and series of
         preferred or special shares which, by the terms of the Certificate of
         Incorporation of the Company, shall be senior to the Series A Shares
         with respect to the right of the holders thereof to participate in the
         assets of the Company distributable to shareholders upon any
         liquidation, dissolution or winding up of the Company.





                                       17
<PAGE>   26
                 "Subsidiary" shall mean any entity of which shares of stock or
         other equity interests having at least a majority of the ordinary
         voting power in electing the board of directors or similar governing
         body are, at the time as of which any determination is being made,
         owned by the Company either directly or indirectly through one or more
         Subsidiaries.

         8.      Miscellaneous.

                 (a) If any other class or series of preferred or special
         shares of the Company, whether ranking prior to or on a parity with or
         junior to the Series A Shares as to dividends or assets, shall be
         created, nothing herein shall prevent the holders of any such other
         class or series of preferred or special shares from being given any
         designations, preferences, limitations or relative rights authorized
         by law and the Certificate of Incorporation of the Company, except as
         otherwise expressly provided herein with respect to the foregoing
         matters.

                 (b) All notices or other communications referred to herein,
         except as otherwise expressly provided, shall be hand delivered or
         given by registered or certified mail, return receipt requested,
         postage prepaid, and shall be deemed to have been given when so hand
         delivered or mailed.

         DATED this 8th day of April, 1987.



                                            /s/ Donald L. Evans
                                        -------------------------------
                                        Donald L. Evans, President


   /s/ James M. Alsup        
- - --------------------------------
James M. Alsup, Secretary








                                       18
<PAGE>   27

                             CERTIFICATE OF MERGER
                                    MERGING
                                TOM BROWN, INC.
                              A NEVADA CORPORATION
                                      INTO
                                TOM BROWN, INC.
                             A DELAWARE CORPORATION

             (Pursuant to Section 252 of the General Corporation
                        Law of the State of Delaware)


         Tom Brown, Inc., a corporation organized under the laws of the State
of Delaware, does hereby certify that:

         1.      The names and states of incorporation of each of the
constituent corporations are:

                  Name of Corporation                     State
                  -------------------                     -----

                     Tom Brown, Inc.                      Nevada

                     Tom Brown, Inc.                      Delaware

         2.      A Plan and Agreement of Merger has been approved, adopted,
certified, executed and acknowledged by each of the constituent corporations in
accordance with Section 252(c) of the General Corporation Law of the State of
Delaware.

         3.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         4.      The Certificate of Incorporation of Tom Brown, Inc., a
Delaware corporation, shall be the Certificate of Incorporation of the
surviving corporation.

         5.      The executed Plan and Agreement of Merger is on file at the
principal place of business of the surviving corporation as follows:

                                Tom Brown, Inc.
                                500 Empire Plaza
                              Midland, Texas 79701

         6.      A copy of the Plan and Agreement of Merger will be furnished
by the surviving corporation on request and without cost, to any stockholder of
any constituent corporation.

         7.      The authorized capital stock of Tom Brown Inc., Nevada, is
150,000,000 shares, of which 100,000,000 shares are common stock and 50,000,000
shares are preferred stock.

<PAGE>   28
         IN WITNESS WHEREOF, said Tom Brown, Inc., a Delaware corporation, has
caused this certificate to be signed by Donald L. Evans, its President, and
attested by James M. Alsup, its Secretary, this 9th day of April, 1987.



                                        By:  /s/ Donald L. Evans
                                           -----------------------------------
                                             Donald L. Evans, President





ATTEST:

   /s/ James M. Alsup         
- - ------------------------------     
James M. Alsup, Secretary




THE STATE OF TEXAS        )       
                          )       
COUNTY OF MIDLAND         )       

         This instrument was acknowledged before me on April 9, 1987, by Donald
L. Evans, President of Tom Brown, Inc., a Delaware corporation, on behalf of
said Corporation.


                                        /s/ Rita K. Turner
                                        ------------------------------------
                                        Name  Rita K. Turner
                                            --------------------------------
                                             Notary Public in and for
                                             the State of Texas

My Commission Expires:
      10/23/89                          
- - ------------------------



<PAGE>   29

                      CERTIFICATE OF OWNERSHIP AND MERGER
                                    MERGING
                              TBI MANAGEMENT, INC.
                                      INTO
                                TOM BROWN, INC.,
                             A DELAWARE CORPORATION

                        (Pursuant to Sections 253 of the
               General Corporation Law of the State of Delaware)

         TOM BROWN, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, does hereby
certify that:

         1.      Tom Brown, Inc. is the parent corporation of TBI Management,
Inc., a Texas corporation, and Tom Brown, Inc. owns 100% of the outstanding
shares of stock of TBI Management, Inc., and therefore is entitled to Merge TBI
Management, Inc. into Tom Brown, Inc. under the provisions of Section 253 of
the General Corporation Law of the State of Delaware.

         2.      The provision for making this Certificate of Ownership and
Merger is contained in the Tom Brown, Inc.  Unanimous Consent of Directors,
attached hereto as Exhibit "A".

         3.      The names and state of incorporation of each of the
constituent corporations are:

                 Name of Corporation                                State
                 -------------------                                -----

                 TBI Management, Inc.                               Texas

                 Tom Brown, Inc.                                    Delaware

         4.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         5.      The principal place of business of the surviving corporation
is:

                 Tom Brown, Inc.
                 500 Empire Plaza
                 Midland, Texas  79701
                 Attn:  Mr. Donald L. Evans

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Ownership and Merger to be signed on its behalf by its President and attested
by its Secretary this 25th day of April, 1988.


Attest:                                            TOM BROWN, INC.

/s/ James M. Alsup                       By:  /s/ Donald L. Evans
- - -------------------------                   ------------------------------
James M. Alsup, Secretary                Donald L. Evans, President
<PAGE>   30

                                   EXHIBIT A


                       SPECIAL MEETING UNANIMOUS CONSENT
                      OF THE DIRECTORS OF TOM BROWN, INC.
                       PURSUANT TO SECTION 141(f) OF THE
                           GENERAL CORPORATION LAW OF
                             THE STATE OF DELAWARE


         The undersigned, being all of the Directors of TOM BROWN, INC. (the
"Corporation"), and being entitled to vote upon the resolutions hereinafter set
forth, do hereby consent that the resolutions set forth below are deemed to be
adopted to the same extent and to have the same force and effect as if adopted
by unanimous consent in a formal meeting of the Board of Directors of the
Corporation duly called and held for the purpose of acting upon a proposal to
adopt such resolutions:

         "RESOLVED, That the Corporation shall merge with its 100% owned
         subsidiary corporation, TBI Management, Inc., a Texas corporation,
         pursuant to the provisions of Section 253 of the General Corporation
         Law of the State of Delaware and Articles 5.07B(2) and (3) and 5.16 of
         the Business Corporation Act of the State of Texas.

         "RESOLVED, That the officers of the Corporation shall be fully
         authorized to take any actions necessary to accomplish the merger
         between the Corporation and TBI Management, Inc.

         "RESOLVED, That the Corporation shall be the surviving corporation in
         such merger, and that TBI Management, Inc. shall cease to exist.

         "RESOLVED, That such merger shall be effective as of April 25, 1988."

         ADOPTED April 25, 1988.


                                          /s/ Thomas C. Brown
                                        -----------------------------------
                                        Thomas C. Brown, Director


                                          /s/ Donald L. Evans
                                        -----------------------------------
                                        Donald L. Evans, Director


                                          /s/ Edward W. LeBaron, Jr.
                                        -----------------------------------
                                        Edward W. LeBaron, Jr., Director


                                          /s/ Joe G. Roper
                                        -----------------------------------
                                        Joe G. Roper, Director

<PAGE>   31

                      CERTIFICATE OF OWNERSHIP AND MERGER
                                    MERGING
                            GENERAL RESOURCES, INC.
                                      INTO
                                TOM BROWN, INC.,
                             A DELAWARE CORPORATION

                        (Pursuant to Sections 253 of the
               General Corporation Law of the State of Delaware)

         TOM BROWN, INC., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, does hereby
certify that:

         1.      Tom Brown, Inc. is the parent corporation of General
Resources, Inc., a Texas corporation, and Tom Brown, Inc. owns 100% of the
outstanding shares of stock of General Resources, Inc., and therefore is
entitled to merge General Resources, Inc. into Tom Brown, Inc. under the
provisions of Section 253 of the General Corporation Law of the State of
Delaware.

         2.      The provision for making this Certificate of Ownership and
Merger is contained in the Tom Brown, Inc.  Unanimous Consent of Directors,
attached hereto as Exhibit A.

         3.      The names and state of incorporation of each of the
constituent corporations are:

                 Name of Corporation                                State
                 -------------------                                -----

                 General Resources, Inc.                            Texas

                 Tom Brown, Inc.                                    Delaware

         4.      The name of the surviving corporation is Tom Brown, Inc., a
Delaware corporation.

         5.      The principal place of business of the surviving corporation
is:

                 Tom Brown, Inc.
                 500 Empire Plaza
                 Midland, Texas  79701
                 Attn:  Mr. Donald L. Evans

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Ownership and Merger to be signed on its behalf by its President and attested
by its Secretary this 25th day of April, 1988.

Attest:                                            TOM BROWN, INC.


/s/ James M. Alsup                       By:  /s/ Donald L. Evans
- - -------------------------                   ----------------------------
James M. Alsup, Secretary                   Donald L. Evans, President
<PAGE>   32
                                   EXHIBIT A

                       SPECIAL MEETING UNANIMOUS CONSENT
                      OF THE DIRECTORS OF TOM BROWN, INC.
                       PURSUANT TO SECTION 141(f) OF THE
                           GENERAL CORPORATION LAW OF
                             THE STATE OF DELAWARE


         The undersigned, being all of the Directors of TOM BROWN, INC.  (the
"Corporation"), and being entitled to vote upon the resolutions hereinafter set
forth, do hereby consent that the resolutions set forth below are deemed to be
adopted to the same extent and to have the same force and effect as if adopted
by unanimous consent in a formal meeting of the Board of Directors of the
Corporation duly called and held for the purpose of acting upon a proposal to
adopt such resolutions:

         "RESOLVED,  That the Corporation shall merge with its 100% owned
         subsidiary corporation, General Resources, Inc., a Texas corporation,
         pursuant to the provisions of Section 253 of the General Corporation
         Law of the State of Delaware and Articles 5.07B(2) and (3) and 5.16 of
         the Business Corporation Act of the State of Texas.

         "RESOLVED, That the officers of the Corporation shall be fully
         authorized to take any actions necessary to accomplish the merger
         between the Corporation and General Resources, Inc.

         "RESOLVED, That the Corporation shall be the surviving corporation in
         such merger, and that General Resources, Inc. shall cease to exist.

         "RESOLVED, That such merger shall be effective as of April 25, 1988."

         ADOPTED April 25, 1988.


                                          /s/ Thomas C. Brown
                                        ------------------------------------
                                        Thomas C. Brown, Director


                                          /s/ Donald L. Evans
                                        ------------------------------------
                                        Donald L. Evans, Director


                                          /s/ Edward W. LeBaron, Jr.
                                        ------------------------------------
                                        Edward W. LeBaron, Jr., Director


                                          /s/ Joe G. Roper
                                        ------------------------------------
                                        Joe G. Roper, Director

<PAGE>   33

                        CERTIFICATE OF AMENDMENT TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.

         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation") does
hereby certify as follows:

         FIRST:  Pursuant to the provisions of the Delaware General Corporation
Law, the Board of Directors and the stockholders of the Corporation adopted an
amendment to the Certificate of Incorporation of the Corporation, which is set
forth in the following resolution in accordance with Section 242 of the
Delaware General Corporation Law, the purpose of which amendment is to effect a
one-for-twenty reverse stock split:

         "RESOLVED, That the Certificate of Incorporation of the Corporation be
         amended by changing Paragraph Fourth thereof, so that as amended, said
         Paragraph Fourth shall read as follows:

                 FOURTH:  The total number of shares of all classes that the
                 Corporation shall have authority to issue is 12,500,000, of
                 which 2,500,000 shares shall be Preferred Stock, par value
                 $.10 per share, and 10,000,000 shares shall be Common Stock,
                 $.10 par value per share.  All of such shares shall, upon
                 issuance thereof, be fully paid and non-assessable.

                 The designations, preferences, limitations and relative rights
                 of the shares of each class that the Corporation shall have
                 authority to issue are as follows:

                 A.       Preferred Stock.  The Board of Directors is hereby
                          expressly vested with the authority to adopt a
                          resolution or resolutions providing for the issue of
                          authorized but unissued shares of Preferred Stock,
                          which shares may be issued from time to time in one
                          or more series and in such amounts as may be
                          determined by the Board of Directors in such
                          resolution or resolutions.  The designations,
                          preferences, limitations or relative rights of the
                          Preferred Stock and the qualifications, limitations
                          or restrictions, if any, of such preferences and/or
                          rights (collectively, the "Series Terms") may vary
                          between series in any and all respects and shall be
                          such as are
<PAGE>   34
                          stated and expressed in a resolution or resolutions
                          providing for the creation or revision of such Series
                          Terms set forth in a Certificate of Designations (a
                          "Preferred Stock Series Resolution") adopted by the
                          Board of Directors; provided that all shares of any
                          one series of Preferred Stock so designated by the
                          Board of Directors shall be identical in all respects
                          except that shares of any one series issued at
                          different times may differ as to the dates from which
                          dividends thereon may be cumulative.  The powers of
                          the Board of Directors with respect to the Series
                          Terms of a particular series shall include, but not
                          be limited to, determination of the following:
        
                          1.  The right to receive dividends, if any, and
                              the rate, dates, terms and other conditions
                              on which such dividends shall be payable;
                              
                          2.  The nature of the dividend payable, if any,
                              with respect to shares of such series as
                              cumulative, non-cumulative or partially
                              cumulative;
                              
                          3.  The redemption rights of such series
                              including the price at and the terms and
                              conditions on which such shares may be
                              redeemed;
                              
                          4.  The amount payable upon shares in the event
                              of involuntary liquidation;
                              
                          5.  The amount payable upon shares in the event
                              of voluntary liquidation;
                              
                          6.  Sinking fund provisions for the redemption or
                              purchase of shares;
                              
                          7.  The terms and conditions on which shares may
                              be converted, if the shares of any series are
                              issued with the privilege of conversion;
                              
                          8.  Voting rights, if any; and





                                       2
<PAGE>   35
                          9.  Repurchase obligations of the Corporation
                              with respect to the shares of each series.

                          Any of the Series Terms, including voting rights, of
                          any series may be made dependent upon facts
                          ascertainable outside this Certificate of
                          Incorporation and the Preferred Stock Series
                          Resolution, provided that the manner in which such
                          facts shall operate upon such Series Terms is clearly
                          and expressly set forth herein or in the Preferred
                          Stock Series Resolution.

                          Subject to the provisions of this Paragraph Fourth,
                          shares of one or more series of Preferred Stock may
                          be authorized or issued from time to time as shall be
                          determined by and for such consideration as shall be
                          fixed by the Board of Directors, in an aggregate
                          amount not exceeding the total number of shares of
                          Preferred Stock authorized herein.  Except in respect
                          of Series Terms fixed by the Board of Directors as
                          permitted hereby, all shares of Preferred Stock shall
                          be of equal rank and shall be identical.

                 B.  Common Stock.

                          1.  Dividends.  Subject to the provisions of any
                              Preferred Stock Series Resolution, the Board
                              of Directors may, in its discretion, out of
                              funds legally available for the payment of
                              dividends and at such times and in such
                              manner as determined by the Board of
                              Directors, declare and pay dividends on the
                              Common Stock of the Corporation.
                              
                              No dividend (other than a dividend in capital
                              stock ranking on a parity with the Common
                              Stock or cash in lieu of fractional shares
                              with respect to such stock dividend) shall be
                              declared or paid on any share or shares of
                              any class of stock or series thereof ranking
                              on a
                              




                                       3
<PAGE>   36
                              parity with the Common Stock in respect of
                              payment of dividends for any dividend period
                              unless there shall have been declared, for the
                              same dividend period, like proportionate
                              dividends on all shares of Common Stock then
                              outstanding.
        
                          2.  Liquidation.  In the event of any
                              liquidation, dissolution or winding up of the
                              Corporation, whether voluntary or
                              involuntary, after payment or provision for
                              payment of the debts and other liabilities of
                              the Corporation and after payment of any
                              preferential amount due to the holders of any
                              other class or series of stock, the holders
                              of the Common Stock shall be entitled to
                              receive ratably any or all assets remaining
                              to be paid or distributed.
                              
                          3.  Voting Rights.  Subject to any special voting
                              rights set forth in any Preferred Stock
                              Series Resolution, the holders of the Common
                              Stock of the Corporation shall be entitled at
                              all meetings of shareholders to one vote for
                              each share of such stock held by them.

                 C.       Prior, Parity or Junior Stock.  Whenever reference is
                          made in this Paragraph Fourth or in any Preferred
                          Stock Series Resolution to shares "ranking prior to"
                          another class or series of stock or "on a parity
                          with" another class or series of stock, such
                          reference shall mean and include all other shares of
                          the Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends or as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are given preference
                          over, or rank on an equality with, as the case may
                          be, the rights of the holders of such other class or
                          series of stock.  Whenever reference is made to
                          shares "ranking junior to" another class of stock,
                          such





                                       4
<PAGE>   37
                          reference shall mean and include all shares of the
                          Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends and as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are junior and
                          subordinate to the rights of the holders of such
                          class or series of stock.
        
                          Except as otherwise provided herein or in any
                          Preferred Stock Series Resolution, each series of
                          Preferred Stock ranks on a parity with each other
                          series and each series ranks prior to the Common
                          Stock.  Common Stock ranks junior to the Preferred
                          Stock.

                 D.       Liquidation.  For the purposes of Section (2) of
                          Section B of this Paragraph Fourth and for the
                          purpose of the comparable sections of any Preferred
                          Stock Series Resolution, the merger or consolidation
                          of the Corporation into or with any other
                          corporation, or the merger of any other corporation
                          into it, or the sale, lease or conveyance of all or
                          substantially all the assets, property or business of
                          the Corporation, shall not be deemed to be a
                          liquidation, dissolution or winding up of the
                          Corporation.

                 E.       Reservation and Retirement of Shares.  The
                          Corporation shall at all times reserve and keep
                          available, out of its authorized but unissued shares
                          of Common Stock or out of shares of Common Stock held
                          in its treasury, the full number of shares of Common
                          Stock into which all shares of any series of
                          Preferred Stock having conversion privileges from
                          time to time outstanding are convertible.

                          Unless otherwise provided in a Preferred Stock Series
                          Resolution with respect to a particular series of
                          Preferred Stock, all shares of Preferred Stock
                          redeemed or acquired (as a result of conversion or
                          otherwise) shall be retired and restored to the
                          status of authorized but unissued shares.





                                       5
<PAGE>   38
                 F.       Preemptive Rights.

                          1.  No holder of shares of Preferred Stock or
                              Common Stock of the Corporation shall have
                              any preemptive right to purchase or subscribe
                              for or receive any shares of any class, or
                              series thereof, of stock of the Corporation,
                              whether now or hereafter authorized, or any
                              warrants, options, bonds, debentures or other
                              securities convertible into, exchangeable for
                              or carrying any right to purchase any shares
                              of any class, or series thereof, of stock;
                              but such additional shares of stock and such
                              warrants, options, bonds, debentures or other
                              securities convertible into, exchangeable for
                              or carrying any right to purchase any shares
                              of any class, or series thereof, of stock may
                              be issued or disposed of by the Board of
                              Directors to such persons, and on such terms
                              and for such lawful consideration, as in its
                              discretion it shall deem advisable.
                              
                          2.  The stockholders of the Corporation shall
                              have no rights to acquire the shares of
                              Common Stock of the Corporation now held in
                              the treasury of the Corporation or any shares
                              of Common Stock of the Corporation hereafter
                              acquired by the Corporation and held as
                              treasury shares.

                 G.       No Cumulative Voting.  Cumulative voting shall not be
                          allowed in the election of Directors or for any other
                          purpose.

                 H.       Repurchases of Capital Stock.  The Corporation may,
                          without shareholder approval, purchase, directly or
                          indirectly, its own shares to the extent permitted by
                          the Delaware General Corporation Law."

         SECOND:  Pursuant to the provisions of the Delaware General
Corporation Law, the Board of Directors and the stockholders of the Corporation
adopted an amendment to the Certificate of





                                       6
<PAGE>   39
Designations, Preferences and Rights of Serial Preferred Stock Series A
Non-Voting Convertible 6% Cumulative Preferred Stock filed April 9, 1987 with
the Delaware Secretary of State and authorizing the creation and issuance of an
aggregate of 22,000,000 shares of Series A Non-Voting Convertible 6% Cumulative
Preferred Stock, which is set forth in the following resolution in accordance
with Section 242 of the Delaware General Corporation Law, the purpose of which
amendment is to effect a one-for-twenty reverse stock split:

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible.6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be amended by changing the first paragraph of the
         resolution creating the series of serial preferred stock designated as
         the Series A Non-Voting Convertible 6% Cumulative Preferred Stock, so
         that as amended, said paragraph shall read as follows:

                          "RESOLVED, That the Board of Directors of Tom Brown,
                          Inc.  (the "Company"), in the exercise of its best
                          business judgment and intending to act in full
                          compliance with the applicable provisions of the
                          Company's Certificate of Incorporation and Bylaws and
                          the provisions of the Delaware General Corporation
                          Law, hereby establishes a series of Preferred Stock,
                          par value $0.10 per share, of the Company designated
                          as "Series A Non-Voting Convertible 6% Cumulative
                          Preferred Stock" (the "Series A Shares"), and the
                          number of Series A Shares which the Company is
                          authorized to issue from time to time shall be
                          1,100,000 and the designations, preferences,
                          limitations, and relative rights, and qualifications,
                          limitations and restrictions, of the Series A Shares
                          shall be as follows:"

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the numbered
         paragraph 1 thereof, so that as amended, said paragraph 1 shall read
         as follows:

                 1.  Liquidation.  The Series A Shares shall be preferred as to
                     assets over Junior Shares so that, in the event of the
                     voluntary or involuntary liquidation, dissolution or





                                       7
<PAGE>   40
                     winding up of the Company, the holders of the Series A
                     Shares shall be entitled, in conjunction with any
                     provision then being made for the holders of Parity
                     Shares, if any, to have set apart for them or to be paid
                     out of the assets of the Company, after payment or
                     provision for payment of the debts and other liabilities
                     of the Company and after provision for the holders of
                     Senior Shares, if any, but before any distribution is made
                     to or set apart for the holders of Junior Shares, an
                     amount in cash equal to $22.7280 per Series A Share (as
                     adjusted for any stock split, reverse stock split, stock
                     dividend or similar event resulting in a change in the
                     Series A Shares) (the "Liquidation Value"), together with
                     all dividends accrued on such Series A Shares to the date
                     of payment, irrespective of whether such dividends were
                     earned, declared or legally available, and the holders of
                     the Series A Shares shall not be entitled to any further
                     payment in connection with the voluntary or involuntary
                     liquidation, dissolution or winding up of the Company
                     except as expressly provided for in this resolution.  If,
                     upon such liquidation, dissolution or winding up of the
                     Company, the assets of the Company available for
                     distribution to the holders of the Series A Shares and the
                     holders of Parity Shares, if any, shall be insufficient to
                     permit the distribution in full of the amounts receivable
                     as aforesaid by the holders of the Series A Shares and the
                     amounts receivable by the holders of Parity Shares, if
                     any, then all such assets of the Company shall be
                     distributed ratably among the holders of the Series A
                     Shares and the holders of Parity Shares, if any, in
                     proportion to the amounts that each would have been
                     entitled to receive if such assets were sufficient to
                     permit distribution in full as aforesaid.  Neither the
                     consolidation or merger of the Company with or into any
                     corporation or corporations, nor the sale, lease or
                     transfer by the Company of all or any part of its assets,
                     nor the reduction of the authorized or  issued shares of
                     the Company of any class, whether now or hereafter
                     authorized, shall be deemed to be a liquidation,
                     dissolution or winding up of the Company for the purposes
                     of this Section 1.  Written notice of any voluntary or
                     involuntary
        




                                       8
<PAGE>   41
                     liquidation, dissolution or winding up of the Company,
                     setting the payment date and the place where the amounts
                     to be distributed shall be paid and containing a reference
                     to the conversion option granted by Section 2 hereof,
                     shall be given not less than thirty (30) days prior to the
                     payment date stated therein to the holders of record of
                     the Series A Shares at their respective addresses as the
                     same shall appear on the stock ledger of the Company."
        
         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the numbered
         paragraph 2(a) thereof, so that as amended, said paragraph 2(a) shall
         read as follows:

                 2.       Conversion.

                          (a)  Subject to the terms and conditions of this
                 Section 2, the Series A Shares shall be convertible, at any
                 time and from time to time, at the option of the holder
                 thereof, into Common Shares by surrender of the certificate or
                 certificates for the Series A Shares to be so converted, duly
                 endorsed, at the principal office of the Company (or at such
                 other place or places as may be designated by the Company from
                 time to time by notice sent to the holders of the Series A
                 Shares at their respective addresses as the same shall appear
                 on the stock ledger of the Company) or at the corporate trust
                 office of any transfer agent for the Series A Shares at any
                 time during normal business hours, together with notice that
                 the holder elects to convert such Series A Shares, or a stated
                 number of such shares, in accordance with the provisions of
                 this Section 2.  Such notice shall also state the name or
                 names (with addresses) in which the certificate or
                 certificates for Common Shares shall be issued.  The number of
                 Common Shares that any such holder shall receive in return for
                 each Series A Share converted by such holder shall be computed
                 by dividing (x) $22.7280 (as adjusted for any stock split,
                 reverse stock split, stock dividend or similar event





                                       9
<PAGE>   42
                 resulting in a change in the Series A Shares) by (y) the 
                 Conversion Price then in effect."

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be further amended by changing the first sentence of
         paragraph 2(c) thereof, so that as amended, said sentence shall read
         as follows:

                       2.(c) The initial Conversion Price shall be $5.6820."

         "RESOLVED, That the Certificate of Designations, Preferences and
         Rights of Serial Preferred Stock - Series A Non-Voting Convertible 6%
         Cumulative Preferred Stock filed with the Delaware Secretary of State
         on April 9, 1987, be amended by changing the numbered paragraph 4(a)
         thereof, so that as amended, said paragraph 4(a) shall read as
         follows:

                 4.       Dividends.

                          (a) The holders of the Series A Shares shall be
                 entitled to receive out of funds legally available therefor,
                 cumulative cash dividends at the rate of 6% per annum of the
                 Liquidation Value per Series A Share ($22.7280, as adjusted
                 for any stock split, reverse stock split, stock dividend or
                 similar event resulting in a change in the Series A Shares)
                 (the "Dividend Rate"), payable on June 30 of each year in
                 which any Series A Shares shall be outstanding, commencing
                 June 30, 1987, to the holders of record of such Series A
                 Shares on the respective dates fixed for such purpose by the
                 Board of Directors of the Company in advance of payment of
                 each dividend.  Dividends on each Series A Share shall be
                 cumulative from the date of issue thereof.  The first dividend
                 payable with respect to any Series A Share shall be computed
                 by multiplying the Dividend Rate by a fraction of which (i)
                 the numerator shall be the number of days from the date of
                 issue of such Series A Share through the date as of which such
                 first dividend is payable, inclusive, and (ii) the denominator
                 shall be 360."





                                       10
<PAGE>   43
         Upon the filing in the Office of the Secretary of State of Delaware of
this Certificate of Amendment, each twenty issued and outstanding shares of
common stock shall thereby and thereupon be combined into one share of common
stock and each twenty issued and outstanding shares of Series A Non-Voting
Convertible 6% Cumulative preferred stock shall thereupon be combined into one
share of Series A Non-Voting Convertible 6% Cumulative preferred stock.  Each
certificate that theretofore represented shares of common stock prior to the
filing of this Certificate of Amendment shall thereafter represent the number
of shares of common stock into which the shares of common stock represented by
such certificate shall be combined, and each certificate that theretofore
represented shares of Series A Non-Voting Convertible 6% Cumulative preferred
stock prior to the filing of this Certificate of Amendment shall thereafter
represent the number of shares of Series A Non-Voting Convertible 6% Cumulative
preferred stock into which the shares of Series A Non-Voting Convertible 6%
Cumulative preferred stock represented by such certificate shall be combined.
To the extent a shareholder holds a number of shares of common stock not evenly
divisible by twenty, such shareholder will receive cash for each fractional
interest resulting from such division.

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Amendment to be signed by Thomas C. Brown, its Chairman of the Board of
Directors, and attested by Regina Neill, its Assistant Secretary, this 7th day
of September, 1988.


                                        TOM BROWN, INC.


                                          /s/ Thomas C. Brown
                                        --------------------------------
                                        Thomas C. Brown, Chairman of
                                             the Board of Directors
ATTESTED:


  /s/ Regina Neill         
- - ----------------------------  
Regina Neill, Assistant
  Secretary



         The undersigned Chairman of the Board of Directors of Tom Brown, Inc.,
being duly sworn, does verify that the foregoing instrument represents the act
and deed of Tom Brown, Inc. and that the facts stated in such instrument are
true.


                                          /s/ Thomas C. Brown
                                        ----------------------------------
                                        Thomas C. Brown, Chairman of
                                        the Board of Directors





                                       11
<PAGE>   44



THE STATE OF TEXAS        )       
                          )       
COUNTY OF MIDLAND         )       


         Before me, the undersigned authority, on this day personally appeared
THOMAS C. BROWN and REGINA NEILL, Chairman of the Board of Directors and
Assistant Secretary, respectively, of Tom Brown, Inc., a corporation formed
under the laws of the State of Delaware, known to me to be the individuals
whose names are subscribed to the foregoing instrument, and acknowledged and
swore to me that they each executed the same for the purposes and consideration
therein expressed and as the act and deed of said corporation and that the
facts stated in the foregoing instrument are true.



         GIVEN UNDER MY HAND AND SEAL OF OFFICE this 7th day of September, 1988.


                                          /s/ Rita K. Turner
                                        --------------------------------
                                        Name  Rita K. Turner
                                            ---------------------------- 
                                            Notary Public in and for
                                             the State of Texas

Commission Expires:

  10/23/89          
- - --------------------









                                       12
<PAGE>   45

                        CERTIFICATE OF AMENDMENT TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.


         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation"), does
hereby certify as follows:

         Pursuant to the provisions of the Delaware General Corporation Law,
the Board of Directors and the stockholders of the Corporation adopted an
amendment to the Certificate of Incorporation of the Corporation, which is set
forth in the following resolution in accordance with Section 242 of the
Delaware General Corporation Law, the purpose of which amendment is to increase
the number of authorized shares of Common Stock:

         "RESOLVED, That the Certificate of Incorporation of the Corporation be
         amended by changing Paragraph Fourth thereof, so that as amended, said
         Paragraph Fourth shall read as follows:

                 FOURTH:  The total number of shares of all classes that the
                 Corporation shall have authority to issue is 22,500,000, of
                 which 2,500,000 shares shall be Preferred Stock, par value
                 $.10 per share, and 20,000,000 shares shall be Common Stock,
                 $.10 par value per share.  All of such shares shall, upon
                 issuance thereof, be fully paid and nonassessable.

                 The designations, preferences, limitations and relative rights
                 of the shares of each class that the Corporation shall have
                 authority to issue are as follows:

                 A.       Preferred Stock.  The Board of Directors is hereby
                          expressly vested with the authority to adopt a
                          resolution or resolutions providing for the issue of
                          authorized but unissued shares of Preferred Stock,
                          which shares may be issued from time to time in one
                          or more series and in such amounts as may be
                          determined by the Board of Directors in such
                          resolution or resolutions.  The designations,
                          preferences, limitations or relative rights of the
                          Preferred Stock and the qualifications, limitations
                          or restrictions, if any, of such preferences and/or
                          rights (collectively, the "Series Terms") may vary
                          between series in any
<PAGE>   46
                          and all respects and shall be such as are stated and
                          expressed in a resolution or resolutions providing
                          for the creation or revision of such Series Terms set
                          forth in a Certificate of Designations (a "Preferred
                          Stock Series Resolution") adopted by the Board of
                          Directors; provided that all shares of any one series
                          of Preferred Stock so designated by the Board of
                          Directors shall be identical in all respects except
                          that shares of any one series issued at different
                          times may differ as to the dates from which dividends
                          thereon may be cumulative.  The powers of the Board
                          of Directors with respect to the Series Terms of a
                          particular series shall include, but not be limited
                          to, determination of the following:
        
                          1.  The right to receive dividends, if any, and
                              the rate, dates, terms and other conditions
                              on which such dividends shall be payable;
                              
                          2.  The nature of the dividend payable, if any,
                              with respect to shares of such series as
                              cumulative, non-cumulative or partially
                              cumulative;
                              
                          3.  The redemption rights of such series
                              including the price at and the terms and
                              conditions on which such shares may be
                              redeemed;
                              
                          4.  The amount payable upon shares in the event
                              of involuntary liquidation;
                              
                          5.  The amount payable upon shares in the event
                              of voluntary liquidation;
                              
                          6.  Sinking fund provisions for the redemption or
                              purchase of shares;
                              
                          7.  The terms and conditions on which shares may
                              be converted, if the shares of any series are
                              issued with the privilege of conversion;
                              
                          8.  Voting rights, if any; and





                                       2
<PAGE>   47
                          9.  Repurchase obligations of the Corporation
                              with respect to the shares of each series.

                          Any of the Series Terms, including voting rights, of
                          any series may be made dependent upon facts
                          ascertainable outside this Certificate of
                          Incorporation and the Preferred Stock Series
                          Resolution, provided that the manner in which such
                          facts shall operate upon such Series Terms is clearly
                          and expressly set forth herein or in the Preferred
                          Stock Series Resolution.

                          Subject to the provisions of this Paragraph Fourth,
                          shares of one or more series of Preferred Stock may
                          be authorized or issued from time to time as shall be
                          determined by and for such consideration as shall be
                          fixed by the Board of Directors, in an aggregate
                          amount not exceeding the total number of shares of
                          Preferred Stock authorized herein.  Except in respect
                          of Series Terms fixed by the Board of Directors as
                          permitted hereby, all shares of Preferred Stock shall
                          be of equal rank and shall be identical.

                 B.       Common Stock.

                          1.  Dividends.  Subject to the provisions of any
                              Preferred Stock Series Resolution, the Board
                              of Directors may, in its discretion, out of
                              funds legally available for the payment of
                              dividends and at such times and in such
                              manner as determined by the Board of
                              Directors, declare and pay dividends on the
                              Common Stock of the Corporation.
                              
                              No dividend (other than a dividend in capital
                              stock ranking on a parity with the Common
                              Stock or cash in lieu of fractional shares
                              with respect to such stock dividend) shall be
                              declared or paid on any share or shares of
                              any class of stock or series thereof ranking
                              on a
                              




                                       3
<PAGE>   48
                              parity with the Common Stock in respect of
                              payment of dividends for any dividend period
                              unless there shall have been declared, for the
                              same dividend period, like proportionate
                              dividends on all shares of Common Stock then
                              outstanding.
        
                          2.  Liquidation.  In the event of any
                              liquidation, dissolution or winding up of the
                              Corporation, whether voluntary or
                              involuntary, after payment or provision for
                              payment of the debts and other liabilities of
                              the Corporation and after payment of any
                              preferential amount due to the holders of any
                              other class or series of stock, the holders
                              of the Common Stock shall be entitled to
                              receive ratably any or all assets remaining
                              to be paid or distributed.
                              
                          3.  Voting Rights.  Subject to any special voting
                              rights set forth in any Preferred Stock
                              Series Resolution, the holders of the Common
                              Stock of the Corporation shall be entitled at
                              all meetings of shareholders to one vote for
                              each share of such stock held by them.

                 C.       Prior, Parity or Junior Stock.  Whenever reference is
                          made in this Paragraph Fourth or in any Preferred
                          Stock Series Resolution to shares "ranking prior to"
                          another class or series of stock or "on a parity
                          with" another class or series of stock, such
                          reference shall mean and include all other shares of
                          the Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends or as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are given preference
                          over, or rank on an equality with, as the case may
                          be, the rights of the holders of such other class or
                          series of stock.  Whenever reference is made to
                          shares "ranking junior to" another class of stock,
                          such





                                       4
<PAGE>   49
                          reference shall mean and include all shares of the
                          Corporation in respect of which the rights of the
                          holders thereof as to the payment of dividends and as
                          to distributions in the event of a voluntary or
                          involuntary liquidation, dissolution or winding up of
                          the affairs of the Corporation are junior and
                          subordinate to the rights of the holders of such
                          class or series of stock.
        
                 D.       Liquidation.  For the purposes of Section (2) of
                          Section B of this Paragraph Fourth and for the
                          purpose of the comparable sections of any Preferred
                          Stock Series Resolution, the merger or consolidation
                          of the Corporation into or with any other
                          corporation, or the merger of any other corporation
                          into it, or the sale, lease or conveyance of all or
                          substantially all the assets, property or business of
                          the Corporation, shall not be deemed to be a
                          liquidation, dissolution or winding up of the
                          Corporation.

                 E.       Reservation and Retirement of Shares.  The
                          Corporation shall at all times reserve and keep
                          available, out of its authorized but unissued shares
                          of Common Stock or out of shares of Common Stock held
                          in its treasury, the full number of shares of Common
                          Stock into which all shares of any series of
                          Preferred Stock having conversion privileges from
                          time to time outstanding are convertible.

                          Unless otherwise provided in a Preferred Stock Series
                          Resolution with respect to a particular series of
                          Preferred Stock, all shares of Preferred Stock
                          redeemed or acquired (as a result of conversion or
                          otherwise) shall be retired and restored to the
                          status of authorized but unissued shares.

                 F.       Preemptive Rights.

                          1.  No holder of shares of Preferred Stock or
                              Common Stock of the Corporation shall have
                              any preemptive right to purchase or subscribe
                              for or receive any shares





                                       5
<PAGE>   50
                              of any class, or series thereof, of stock of the
                              Corporation, whether now or hereafter authorized,
                              or any warrants, options, bonds, debentures or
                              other securities convertible into, exchangeable
                              for or carrying any right to purchase any shares
                              of any class, or series thereof, of stock; but
                              such additional shares of stock and such
                              warrants, options, bonds, debentures or other
                              securities convertible into, exchangeable for or
                              carrying any right to purchase any shares of any
                              class, or series thereof, of stock may be issued
                              or disposed of by the Board of Directors to such
                              persons, and on such terms and for such lawful
                              consideration, as in its discretion it shall deem
                              advisable.
        
                          2.  The stockholders of the Corporation shall
                              have no rights to acquire the shares of
                              Common Stock of the Corporation now held in
                              the treasury of the Corporation or any shares
                              of Common Stock of the Corporation hereafter
                              acquired by the Corporation and held as
                              treasury shares.

                 G.       No Cumulative Voting.  Cumulative voting shall not be
                          allowed in the election of Directors or for any other
                          purpose.

                 H.       Repurchases of Capital Stock.  The Corporation may,
                          without shareholder approval, purchase, directly or
                          indirectly, its own shares to the extent permitted
                          by the Delaware General Corporation Law."





                                       6
<PAGE>   51
         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Amendment to be signed by Donald L. Evans, its Chairman of the Board of
Directors, and attested by Kim Harris, its Assistant Secretary, this 1st day of
June, 1990.

                                        TOM BROWN, INC.


                                        By: /s/ Donald L. Evans
                                           ---------------------------
                                        Donald L. Evans, Chairman
                                        of the Board of Directors
ATTESTED:

  /s/ Kim Harris       
- - ------------------------
Kim Harris, Assistant
  Secretary

         The undersigned Chairman of the Board of Directors of Tom Brown, Inc.,
being duly sworn, does verify that the foregoing instrument represents the act
and deed of Tom Brown, Inc. and that the facts stated in such instrument are
true.


                                         /s/ Donald L. Evans
                                        ---------------------------------
                                        Donald L. Evans, Chairman of
                                          the Board of Directors

STATE OF TEXAS            )       
                          )       
COUNTY OF MIDLAND         )       

         Before me, the undersigned authority, on this day personally appeared
DONALD L. EVANS and KIM HARRIS, Chairman of the Board of Directors and
Assistant Secretary, respectively, of Tom Brown, Inc., a corporation formed
under the laws of the State of Delaware, known to me to be the individuals
whose names are subscribed to the foregoing instrument, and acknowledged and
swore to me that they each executed the same for the purposes and consideration
therein expressed and as the act and deed of said corporation and that the
facts stated in the foregoing instrument are true.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE this 1st day of June, 1990.

My Commission Expires:
                                        /s/ Carolyn Vannoy
                                        --------------------------------
10/27/92                                Name:  Carolyn Vannoy
- - ----------------------                  ---------------------------
                                             Notary Public in and for
                                                the State of Texas






                                       7
<PAGE>   52

                          CERTIFICATE OF DESIGNATION,
                             RIGHTS AND PREFERENCES
                                       of
                    SERIES B PREFERRED STOCK, $.10 PAR VALUE
                                       of
                                TOM BROWN, INC.


         Tom Brown, Inc., a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, DOES HEREBY
CERTIFY:

         That at a meeting of the Board of Directors of Tom Brown, Inc. the
following resolution, creating a series of three hundred thousand (300,000)
shares of Preferred Stock, designated as Series B Preferred Stock, was duly
adopted pursuant to the authority granted to and vested in the Board of
Directors of this corporation in accordance with the provisions of its
Certificate of Incorporation, as amended:

                 RESOLVED, that a series of Preferred Stock, $.10 par value, of
         the corporation be, and it hereby is, created and that the designation
         and amount thereof and the preferences and relative, participating,
         optional and other special rights, and the qualifications, limitations
         and restrictions thereof (in addition to the provisions set forth in
         the Certificate of Incorporation, as amended, of the corporation,
         which are applicable to the Preferred Stock of all classes and series)
         are as follows:

                 I.       Designation and Amount.  The shares of such series
         shall be designated as the "Series B Preferred Stock" (the "Series B
         Preferred Stock") and the number of shares constituting such series
         shall be three hundred thousand (300,000).  Such number of shares may
         be increased or decreased by resolution of the Board of Directors;
         provided, that no decrease shall reduce the number of shares of Series
         B Preferred Stock to a number less than that of the shares then
         outstanding plus the number of shares issuable upon exercise of
         outstanding rights, options or warrants or upon conversion of
         outstanding securities issued by the corporation.

                 II.      Dividends and Distributions.

                          (A)     Subject to the prior and superior rights of
                 the holders of any shares of any series of Preferred Stock
                 ranking prior and superior to the shares of Series B Preferred
                 Stock with respect to dividends, the holders of shares of
                 Series B Preferred Stock, in preference to the holders of
                 common stock, $.10 par value, of the corporation (the "Common
                 Stock") and of any other stock ranking junior (as to
                 dividends) to Series B Preferred Stock, shall be entitled to
                 receive, when, as and if declared by the Board of Directors
                 out of funds legally available for the purpose, cumulative
                 quarterly dividends payable in
<PAGE>   53
                 cash or in kind, as hereinafter provided, on the last day of
                 March, June, September and December in each year (each such
                 date being referred to herein as a "Quarterly Dividend Payment
                 Date"), commencing on the first Quarterly Dividend Payment
                 Date after the first issuance of a share or fraction of a
                 share of Series B Preferred Stock, in an amount per share
                 (rounded to the nearest cent) equal to the greater of (a)
                 $1.00 (payable in cash) or (b) subject to the provision for
                 adjustment hereinafter set forth, 100 times the aggregate per
                 share amount (payable in cash) of all cash dividends, and 100
                 times the aggregate per share amount (payable in kind) of all
                 non cash dividends or other distributions, other than a
                 dividend payable in shares of Common Stock (by
                 reclassification or otherwise), declared on the Common Stock
                 since the immediately preceding Quarterly Dividend Payment
                 Date or, with respect to the first Quarterly Dividend Payment
                 Date, since the first issuance of any share or fraction of a
                 share of Series B Preferred Stock.  If the corporation shall
                 at any time declare or pay any dividend on Common Stock
                 payable in shares of Common Stock or effect a subdivision or
                 combination of the outstanding shares of Common Stock (by
                 reclassification or otherwise), into a greater or lesser
                 number of shares of Common Stock, then in each such case the
                 amount to which holders of Series B Preferred Stock were
                 entitled immediately prior to such event under clause (b) of
                 the preceding sentence shall be adjusted by multiplying such
                 amount by a fraction the numerator of which is the number of
                 shares of Common Stock outstanding immediately after such
                 event and the denominator of which is the number of shares of
                 Common Stock that was outstanding immediately prior to such
                 event.
        
                          (B)     The Corporation shall declare a dividend or
                 distribution on the Series B Preferred Stock as provided in
                 paragraph (A) of this Section immediately after it declares a
                 dividend or distribution on the Common Stock (other than a
                 dividend payable in shares of Common Stock); provided that, if
                 no dividend or distribution shall have been declared on the
                 Common Stock during the period between any Quarterly Dividend
                 Payment Date and the next subsequent Quarterly Dividend
                 Payment Date, a dividend of $1.00 per share on the Series B
                 Preferred Stock shall nevertheless accrue and be cumulative on
                 the outstanding shares of Series B Preferred Stock as provided
                 in paragraph (C) of this Section.

                          (C)     Dividends shall begin to accrue and be
                 cumulative on outstanding shares of Series B Preferred Stock
                 from the Quarterly Dividend Payment Date next preceding the
                 date of issue of such shares of Series B Preferred Stock,
                 unless the date of issue of such shares is





                                       2
<PAGE>   54
                 prior to the record date for the first Quarterly Dividend
                 Payment Date, in which case dividends on such shares shall
                 begin to accrue from the date of issue of such shares, or
                 unless the date of issue is a Quarterly Dividend Payment Date
                 or is a date after the record date for the determination of
                 holders of shares of Series B Preferred Stock entitled to
                 receive a quarterly dividend and before such Quarterly
                 Dividend Payment Date, in either of which events such
                 dividends shall begin to accrue and be cumulative from such
                 Quarterly Dividend Payment Date.  Accrued but unpaid dividends
                 shall not bear interest. Dividends paid on the shares of
                 Series B Preferred Stock in an amount less than the total
                 amount of such dividends at the time accrued and payable on
                 such shares shall be allocated pro rata on a share by share
                 basis among all such shares at the time outstanding.  The
                 Board of Directors may fix a record date for the determination
                 of holders of shares of Series B Preferred Stock entitled to
                 receive a payment of a dividend or distribution declared
                 thereon, which record date shall be not more than 60 days
                 prior to the date fixed for the payment thereof.
        
                 III.     Voting Rights.  The holders of shares of Series B
         Preferred Stock shall have the following voting rights:

                          (A)     Subject to the provision for adjustment
                 hereinafter set forth, each share of Series B Preferred Stock
                 shall entitle the holder thereof to 100 votes on all matters
                 submitted to a vote of the share-holders of the corporation.
                 If the corporation shall at any time declare or pay any
                 dividend on Common Stock payable in shares of Common Stock, or
                 effect a subdivision or combination of the outstanding shares
                 of Common Stock (by reclassification or otherwise) into a
                 greater or lesser number of shares of Common Stock, then in
                 each such case the number of votes per share to which holders
                 of shares of Series B Preferred Stock were entitled
                 immediately prior to such event shall be adjusted by
                 multiplying such number by a fraction the numerator of which
                 is the number of shares of Common Stock outstanding
                 immediately after such event and the denominator of which is
                 the number of shares of Common Stock that were outstanding
                 immediately prior to such event.

                          (B)     Except as otherwise provided in the
                 Certificate of Incorporation or by law, the holders of shares
                 of Series B Preferred Stock and the holders of shares of
                 Common Stock shall vote together as one class on all matters
                 submitted to a vote of shareholders of the corporation.





                                       3
<PAGE>   55
                 IV.      Certain Restrictions.

                          (A)     Whenever quarterly dividends or other
                 dividends or distributions payable on the Series B Preferred
                 Stock as provided in Section II are in arrears, thereafter and
                 until all accrued and unpaid dividends and distributions,
                 whether or not declared, on shares of Series B Preferred Stock
                 outstanding shall have been paid in full, the corporation
                 shall not:

                                  (i)      declare or pay dividends on, make
                          any other distributions on, or redeem or purchase or
                          otherwise acquire for consideration any shares of
                          stock ranking junior (as to dividends) to the Series
                          B Preferred Stock;

                                  (ii)     declare or pay dividends on or make
                          any other distributions on any shares of stock
                          ranking on a parity (as to dividends) with the Series
                          B Preferred Stock, except dividends paid ratably on
                          the Series B Preferred Stock and all such parity
                          stock on which dividends are payable or in arrears in
                          proportion to the total amounts to which the holders
                          of all such shares are then entitled; or

                                  (iii)    purchase or otherwise acquire for
                          consideration any shares of Series B Preferred Stock,
                          or any shares of stock ranking on a parity (as to
                          dividends) with the Series B Preferred Stock, except
                          in accordance with a purchase offer made in writing
                          or by publication (as determined by the Board of
                          Directors) to all holders of such shares upon such
                          terms as the Board of Directors, after consideration
                          of the respective annual dividend rates and other
                          relative rights and preferences of the respective
                          series and classes, shall determine in good faith
                          will result in fair and equitable treatment among the
                          respective series or classes.

                          (B)     The corporation shall not permit any
                 subsidiary of the corporation to purchase or otherwise acquire
                 for consideration any shares of stock of the corporation
                 unless the corporation could, under paragraph (A) of this
                 Section IV, purchase or otherwise acquire such shares at such
                 time and in such manner.





                                       4
<PAGE>   56
                 V.       Reacquired Shares.  Any shares of Series B Preferred
         Stock purchased or otherwise acquired by the corporation in any manner
         whatsoever shall be retired and cancelled promptly after the
         acquisition thereof.  All such shares shall upon their cancellation
         become authorized but unissued shares of Preferred Stock and may be
         reissued as part of a series of Preferred Stock to be created by
         resolution or resolutions of the Board of Directors, subject to the
         conditions and restrictions on issuance set forth herein.

                 VI.      Liquidation, Dissolution or Winding Up.  Upon any
         liquidation, dissolution or winding up of the corporation, no
         distribution shall be made (1) to the holders of shares of stock
         ranking junior (as to amounts payable upon liquidation, dissolution or
         winding up) to the Series B Preferred Stock unless, prior thereto, the
         holders of Series B Preferred Stock shall have received an amount per
         share (rounded to the nearest cent) equal to the greater of (a)
         $100.00 per share, or (b) an amount per share, subject to the
         provision for adjustment hereinafter set forth, equal to 100 times the
         aggregate amount to be distributed per share to holders of Common
         Stock, plus, in either case, an amount equal to accrued and unpaid
         dividends and distributions thereon, whether or not declared, to the
         date of such payment, or (2) to the holders of stock ranking on a
         parity (as to amounts payable or upon liquidation, dissolution or
         winding up) with the Series B Preferred Stock and all other such
         parity stock in proportion to the total amounts to which the holders
         of all such shares are entitled upon such liquidation, dissolution or
         winding up.  If the corporation shall at any time declare or pay any
         dividend on Common Stock payable in shares of Common Stock, or effect
         a subdivision or combination of the outstanding shares of Common Stock
         (by reclassification or otherwise) into a greater or lesser number of
         shares of Common Stock, then in each such case the aggregate amount to
         which holders of shares of Series B Preferred Stock were entitled
         immediately prior to such event under the provision in clause (1)(b)
         of the preceding sentence shall be adjusted by multiplying such amount
         by a fraction the numerator of which is the number of shares of Common
         Stock outstanding immediately after such event and the denominator of
         which is the number of shares of Common Stock that were outstanding
         immediately prior to such event.

                 VII.     Consolidation, Merger, Etc.  If the corporation shall
         enter into any consolidation, merger, combination or other transaction
         in which the shares of Common Stock are exchanged for or changed into
         other stock or securities, cash or any other property, or any
         combination thereof, then in any such case the shares of Series B
         Preferred Stock shall at the same time be similarly exchanged or
         changed in an amount per share (subject to the provision for
         adjustment hereinafter set forth) equal to 100 times the aggregate
         amount of stock, securities, cash or any other property, or any
         combination thereof, into which or for which each share of Common
         Stock is





                                       5
<PAGE>   57
         changed or exchanged.  If the corporation shall at any time declare or
         pay any dividend on Common Stock payable in shares of Common Stock, or
         effect a subdivision or combination of the outstanding shares of
         Common Stock (by reclassification or otherwise) into a greater or
         lesser number of shares of Common Stock, then in each such case the
         amount set forth in the preceding sentence with respect to the
         exchange or change of shares of Series B Preferred Stock shall be
         adjusted by multiplying such amount by a fraction the numerator of
         which is the number of shares of Common Stock outstanding immediately
         after such event and the denominator of which is the number of shares
         of Common Stock that were outstanding immediately prior to such event.

                 VIII.    No Redemption.  The shares of Series B Preferred
         Stock shall not be redeemable.

                 IX.      Rank.  Except as otherwise provided in its
         Certificate of Incorporation, as amended, the corporation may
         authorize or create any series of Preferred Stock ranking prior to or
         on a parity with the Series B Preferred Stock as to dividends or as to
         distribution of assets upon liquidation, dissolution or winding up.

                 X.       Amendment.  The Certificate of Incorporation of the
         corporation shall not be amended in any manner which would materially
         alter or change the powers, preferences or special rights of the
         Series B Preferred Stock so as to affect them adversely without the
         affirmative vote of the holders of a majority of the outstanding
         shares of Series B Preferred Stock, voting together as a single class.

         The foregoing resolution was adopted by the Board of Directors of the
corporation, pursuant to the authority vested in it by the Certificate of
Incorporation of the corporation, at a meeting of the Board of Directors duly
held on the 1st day of March, 1991.

         IN WITNESS WHEREOF, this Certificate has been executed on behalf of
the corporation by its President and attested by its Secretary this 13th day of
March, 1991.

                                        TOM BROWN, INC.


                                        By:  /s/ Donald L. Evans
                                           -----------------------------------
                                                                     President

ATTEST:


  /s/ James M. Alsup          
- - --------------------------------
                       Secretary






                                       6
<PAGE>   58


                            CERTIFICATE OF AMENDMENT
                                     TO THE
                          CERTIFICATE OF INCORPORATION
                                       OF
                                TOM BROWN, INC.


         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation"), does
hereby certify as follows:

         Pursuant to the provisions of the Delaware General Corporation Law,
the Board of Directors and the stockholders of the Corporation adopted an
amendment to the Certificate of Incorporation of the Corporation, which is set
forth in the following resolution in accordance with Section 242 of the
Delaware General Corporation Law, the purpose of which amendment is to increase
the number of authorized shares of Common Stock:

         "RESOLVED, That the Certificate of Incorporation of the Corporation be
         amended by changing the first sentence of Article Fourth thereof, so
         that as amended, the first sentence of Article Fourth shall read as
         follows:

                 FOURTH:  The total number of shares of all classes that the
                 Corporation shall have authority to issue is 32,500,000, of
                 which 2,500,000 shares shall be Preferred Stock, par value
                 $.10 per share, and 30,000,000 shares shall be Common Stock,
                 $.10 par value per share.

         Except as specifically amended hereby, all other provisions of Article
Fourth shall remain in full force and effect.

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Amendment to be signed by Donald L. Evans, its Chairman of the Board of
Directors, and attested by Kim Harris, its Assistant Secretary, this 18th day
of May, 1994.


                                        TOM BROWN, INC.


                                        By: /s/ Donald L. Evans
                                           -----------------------------
                                            Donald L. Evans, Chairman of
                                              the Board of Directors

ATTESTED:


 /s/ Kim Harris             
- - -------------------------------   
Kim Harris, Assistant Secretary
<PAGE>   59



         The undersigned Chairman of the Board of Directors of Tom Brown, Inc.,
being duly sworn, does verify that the foregoing instrument represents the act
and deed of Tom Brown, Inc. and that the facts stated in such instrument are
true.


                                         /s/ Donald L. Evans
                                        -----------------------------------
                                        Donald L. Evans, Chairman of
                                           the Board of Directors

STATE OF TEXAS            )       
                          )       
COUNTY OF MIDLAND         )       

         Before me, the undersigned authority, on this day personally appeared
DONALD L. EVANS and KIM HARRIS, Chairman of the Board of Directors and
Assistant Secretary, respectively, of Tom Brown, Inc., a corporation formed
under the laws of the State of Delaware, known to me to be the individuals
whose names are subscribed to the foregoing instrument, and acknowledged and
swore to me that they each executed the same for the purposes and consideration
therein expressed and as the act and deed of said corporation and that the
facts stated in the foregoing instrument are true.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE this 18th day of May, 1994.


                                        /s/ Carolyn Vannoy
                                        ------------------------------
                                        Name:  Carolyn Vannoy
                                             -------------------------
                                             Notary Public in and for
                                                the State of Texas










                                       2
<PAGE>   60

                          CERTIFICATE OF AMENDMENT
                                   TO THE
                        CERTIFICATE OF INCORPORATION
                                     OF
                               TOM BROWN, INC.


         Tom Brown, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation"), does
hereby certify as follows:

         Pursuant to the provisions of the Delaware General Corporation Law,
the Board of Directors and the stockholders of the Corporation adopted an
amendment to the Certificate of Incorporation of the Corporation, which is set
forth in the following resolution in accordance with Section 242 of the
Delaware General Corporation Law, the purpose of which amendment is to increase
the number of authorized shares of Common Stock:

         "RESOLVED, That the Certificate of Incorporation of the Corporation be
         amended by changing the first sentence of Article Fourth thereof, so
         that as amended, the first sentence of Article Fourth shall read as
         follows:

                 FOURTH:  The total number of shares of all classes that the
                 Corporation shall have authority to issue is 42,500,000, of
                 which 2,500,000 shares shall be Preferred Stock, par value
                 $.10 per share, and 40,000,000 shares shall be Common Stock,
                 $.10 par value per share.

         Except as specifically amended hereby, all other provisions of Article
Fourth shall remain in full force and effect.

         IN WITNESS WHEREOF, Tom Brown, Inc. has caused this Certificate of
Amendment to be signed by Donald L. Evans, its Chairman of the Board of
Directors, and attested by Kim Harris, its Assistant Secretary, this 22nd day
of May, 1996.


                                        TOM BROWN, INC.


                                        By: /s/ DONALD L. EVANS
                                           -----------------------------
                                           Donald L. Evans, Chairman of
                                             the Board of Directors

ATTESTED:


  /s/ KIM HARRIS
- - -------------------------------
Kim Harris, Assistant Secretary
<PAGE>   61


         The undersigned Chairman of the Board of Directors of Tom Brown, Inc.,
being duly sworn, does verify that the foregoing instrument represents the act
and deed of Tom Brown, Inc. and that the facts stated in such instrument are
true.


                                        /s/ Donald L. Evans
                                        ------------------------------
                                        Donald L. Evans, Chairman of
                                           the Board of Directors

STATE OF TEXAS            )       
                          )       
COUNTY OF MIDLAND         )       

         Before me, the undersigned authority, on this day personally appeared
DONALD L. EVANS and KIM HARRIS, Chairman of the Board of Directors and
Assistant Secretary, respectively, of Tom Brown, Inc., a corporation formed
under the laws of the State of Delaware, known to me to be the individuals
whose names are subscribed to the foregoing instrument, and acknowledged and
swore to me that they each executed the same for the purposes and consideration
therein expressed and as the act and deed of said corporation and that the
facts stated in the foregoing instrument are true.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE this 22nd day of May, 1996.


                                        /s/ Carolyn Vannoy
                                        -------------------------------
                                        Name:  Carolyn Vannoy
                                             Notary Public in and for
                                                the State of Texas










                                       2

<PAGE>   1
                                                                  EXHIBIT NO. 11


                       COMPUTATION OF PER SHARE EARNINGS


<TABLE>
<CAPTION>
                                    Three Months ended              Six Months ended
                                          June 30,                       June 30,   
                                    ------------------              ----------------
                                    1996          1995              1996        1995
                                    ----          ----              ----        ----
  <S>                            <C>            <C>            <C>             <C>
  Primary

     Weighted average common
      shares outstanding         21,121,775     15,536,860      21,117,484      15,530,606
     Net effect of dilutive                                                    
      stock options,                                                           
       treasury stock method        683,559        596,962         611,957         664,842
                                 ----------     ----------      ----------      ----------
                                                                               
              Total common                                                     
                shares           21,805,334     16,133,822      21,729,441      16,195,448
                                 ==========     ==========      ==========      ==========
                                                                               
     Net income to common                                                      
      shareholders              $ 1,012,000    $   273,000     $ 1,882,000     $ 4,803,000
                                 ==========     ==========      ==========      ==========
                                                                               
     Primary earnings per                                                      
      common share              $    .05       $     .02       $    .09        $    .30   
                                 ==========      ==========     ==========      ==========
                                                                               
  Fully Diluted                                                                
                                                                               
     Weighted average common                                                   
      shares outstanding         21,121,775     15,536,860      21,117,484      15,530,606
     Net effect of dilutive                                                    
      stock options,                                                           
       treasury stock method        724,051        596,962         726,106         664,842
     Effect of convertible                                                     
      preferred stock             1,666,000           -          1,666,000           -    
                                 ----------     ----------      ----------      ----------
                                                                               
             Total common                                                     
             shares              23,511,826     16,133,822      23,509,590      16,195,448
                                 ==========     ==========      ==========      ==========
                                                                               
     Net income to common                                                      
       shareholders             $ 1,449,000    $   273,000     $ 2,679,000     $ 4,803,000
                                 ==========     ==========      ==========      ==========
                                                                               
     Fully diluted earnings                                                    
       per common share         $    .06        $    .02       $    .11        $    .30   
                                 ==========      ==========     ==========      ==========
</TABLE>                                                                       






<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               JUN-30-1996
<CASH>                                           6,837
<SECURITIES>                                         0
<RECEIVABLES>                                   12,005
<ALLOWANCES>                                        58
<INVENTORY>                                        440
<CURRENT-ASSETS>                                19,518
<PP&E>                                         246,249
<DEPRECIATION>                                 120,235
<TOTAL-ASSETS>                                 207,262
<CURRENT-LIABILITIES>                           12,316
<BONDS>                                              0
<COMMON>                                         2,112
                                0
                                        100
<OTHER-SE>                                     192,734
<TOTAL-LIABILITY-AND-EQUITY>                   207,262
<SALES>                                         16,757
<TOTAL-REVENUES>                                27,276
<CGS>                                           11,747
<TOTAL-COSTS>                                   23,211
<OTHER-EXPENSES>                                 2,774
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  4,065
<INCOME-TAX>                                     1,386
<INCOME-CONTINUING>                              1,882
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,882
<EPS-PRIMARY>                                      .09
<EPS-DILUTED>                                        0
        

</TABLE>


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