DNR MESA HOLDINGS L P
SC 13D/A, 1997-09-15
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 Schedule 13D/A


          Under the Securities Exchange Act of 1934 (Amendment No. 1)*


                       PIONEER NATURAL RESOURCES COMPANY
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                                   723787107
                                 (CUSIP Number)

                                Kenneth A. Hersh
                          777 Main Street, Suite 2700
                            Fort Worth, Texas 76102
                                 (817) 820-6600
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                               September 3, 1997
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. [ ]

NOTE: Six copies of this statement, including all exhibits, should be filed
with the Commission. See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of the cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).




<PAGE>   2
                                 SCHEDULE 13D

CUSIP NO. 723787107                                        PAGE    OF   PAGES



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      DNR-MESA HOLDINGS, L.P.

- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       
                                                                        (a) [ ]
                                                                        (b) [ ]

- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    SOURCE OF FUNDS*

                                                                OO (SEE ITEM 3)

- --------------------------------------------------------------------------------
 5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
      ITEMS 2(d) or 2(e)                                                    [ ]



- --------------------------------------------------------------------------------
 6    CITIZENSHIP OR PLACE OF ORGANIZATION

      DNR-MESA HOLDINGS, L.P. IS A LIMITED PARTNERSHIP FORMED UNDER THE LAWS OF
      THE STATE OF TEXAS.
      
- --------------------------------------------------------------------------------
                               7     SOLE VOTING POWER

          NUMBER OF                  11,370,165(1)

           SHARES              -------------------------------------------------
                               8     SHARED VOTING POWER                        
        BENEFICIALLY           
                                     0
          OWNED BY                                 
                               ------------------------------------------------
            EACH               9     SOLE DISPOSITIVE POWER
                    
          REPORTING                  11,370,165(1)

           PERSON              ------------------------------------------------
                               10    SHARED DISPOSITIVE POWER                  
            WITH    
                                     0

- ------------------------------------------------------------------------------- 
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      11,370,165
              
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                            [ ]



- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      15.46%(2)
              
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      PN
              
- --------------------------------------------------------------------------------




- ---------------

(1)  As exercised through its sole general partner, Rainwater, Inc., a Texas
     corporation.

(2)  Based on the 73,555,501 shares of Common Stock outstanding, as reported in
     the Issuer's 8-K filed in August 1997.


                     *SEE INSTRUCTION BEFORE FILLING OUT!
        INCLUDED BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
       (INCLUDING EXHIBITS) OF THE SCHEDULE, AND SIGNATURE ATTESTATION.
<PAGE>   3




      The Schedule 13D filed by the Reporting Person with the Securities and
Exchange Commission on August 18, 1997, is hereby amended as follows:

ITEM 1.     SECURITY AND ISSUER.

      No modification.

ITEM 2.     IDENTITY AND BACKGROUND.

      No modification.

ITEM 3.     SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

      No modification.

ITEM 4.     PURPOSE OF TRANSACTION.

      No modification.

ITEM 5.     INTEREST IN SECURITIES OF THE ISSUER.

      No modification.

ITEM 6.     CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
            RESPECT TO THE SECURITIES OF THE ISSUER.

      The Partnership, the Issuer, Chauvco Resources Ltd. ("Chauvco"), Scott D.
Sheffield and I. Jon Brumley have entered into a Shareholders Agreement dated
as of September 3, 1997 (the "Shareholders Agreement") under which the
Partnership has agreed to vote its shares of Common Stock in favor of a
proposed plan of arrangement pursuant to which the Issuer will acquire the
outstanding shares of Chauvco in exchange for shares of the Issuer's common
stock or exchangeable shares of a newly created Canadian subsidiary of the
Issuer. The Shareholders Agreement also provides that the Partnership will not
vote for any change in a majority of the persons who constitute the board of
directors of the Issuer, any change in the present capitalization of the
Issuer, any amendment to the articles or bylaws of the Issuer, or any other
material change in the Issuer's corporate structure or business. The
Shareholders Agreement restricts dispositions of the common stock owned by the
Partnership prior to the termination of the agreement. The Shareholders
Agreement and all obligations of the Partnership thereunder will terminate on
the earlier of the consummation of the proposed arrangement or the termination
of the plan of arrangement. See Exhibit 10.4 attached hereto for a complete
copy of the Shareholders Agreement.

ITEM 7.     MATERIAL TO BE FILED AS EXHIBITS.

      Exhibit 10.4 - Shareholders Agreement dated September 3, 1997 among the
Partnership, the Issuer, Chauvco Resources Ltd., Scott D. Sheffield and I. Jon
Brumley.




<PAGE>   4

                                   SIGNATURES


      After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.



Date:  September 10, 1997         DNR-MESA HOLDINGS, L.P.

                                  By: Rainwater, Inc., its Sole General Partner



                                  By:  /s/  KENNETH A HERSH
                                     ------------------------------------------
                                     Kenneth A. Hersh, Vice President



<PAGE>   5


                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
NUMBER              DESCRIPTION
- -------             -----------
<S>                 <C>
Exhibit 10.4 -      Shareholders Agreement dated September 3, 1997 among the
                    Partnership, the Issuer, Chauvco Resources Ltd., Scott D.
                    Sheffield and I. Jon Brumley.
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 10.4



                             SHAREHOLDERS AGREEMENT

         THIS SHAREHOLDERS AGREEMENT, dated as of September 3, 1997 (this
"Agreement"), is made and entered into by and among PIONEER NATURAL RESOURCES
COMPANY, a Delaware corporation ("US Co"), Chauvco Resources Ltd., an Alberta
Corporation ("Chauvco") and DNR - MESA Holdings, L.P., SCOTT D. SHEFFIELD and
I. JON BRUMLEY (collectively, the "Shareholders").

                                   WITNESSETH

         WHEREAS, concurrently herewith, US Co and Chauvco are entering into a
Combination Agreement (as such agreement may hereafter be amended from time to
time, the "Combination Agreement"), providing for the arrangement (the
"Arrangement") as contemplated by the Combination Agreement, capitalized terms
used and not defined herein have the respective meanings ascribed to them in
the Combination Agreement; and

         WHEREAS, as an inducement and a condition to entering into the
Combination Agreement, Chauvco has required that each Shareholder agrees, and
each Shareholder has agreed, to enter into this Agreement;

         NOW, THEREFORE in consideration of the foregoing and the
representations, warranties, covenants and agreements contained herein and the
benefits to be received  by the parties under the terms of the Combination
Agreement, the parties hereto, intending to be legally bound, hereby agree as
follows:

1.       DEFINITIONS

         For purposes of this Agreement:

         (a)     "Affiliate" of any Person means another Person that directly
                 or indirectly, through one or more intermediaries, controls,
                 is controlled by, or is under common control with, such first
                 Person.

         (b)     "Beneficially Own" or "Beneficial Ownership" with respect to
                 any securities shall mean having "beneficial ownership" of
                 such securities (as determined pursuant to Rule 13d-3 under
                 the Securities Exchange Act of 1934 (the "Exchange Act"))
                 including pursuant to any agreement, arrangement or
                 understanding, whether or not in writing and Beneficial Owner
                 has a corresponding meaning.  Without duplicative counting of
                 the same securities by the same holder, securities
                 Beneficially Owned by a Person shall include securities
                 Beneficially Owned by all other Persons (who are Affiliates of
                 such Person excluding officers and directors of US Co) who
                 together with such Person would constitute a "group" within
                 the meaning of Section 13(d)(3) of the Exchange Act and in any
                 event with respect to the Shareholders shall include Shares
                 held of record by any of the Shareholders'
<PAGE>   2
                 spouses and children.

         (c)     "Person" shall mean an individual, corporation, limited
                 liability company, partnership, joint venture, association, 
                 trust or unincorporated organization.

         (d)     "Shares" shall mean shares of US Co Common Stock.

         (e)     "Shareholder's Shares" shall mean all Shares held of record or
                 Beneficially Owned by such Shareholder, whether currently
                 issued or hereafter acquired except by way of option exercise
                 where such Shares are sold within 10 days of exercise.

         (f)     "Termination Date" shall mean the date that the Combination
                 Agreement has been terminated.

2.       PROVISIONS CONCERNING COMMON STOCK

         From and after the date of this Agreement and ending as of the first
to occur of the Effective Time or the Termination Date, at any meeting of the
holders of Shares, however called, or in any other circumstance upon which the
vote, consent or other approval of holders of Shares is sought, each
Shareholder shall vote (or cause to be voted) such Shareholder's issued and
outstanding Shareholders' Shares (and each class thereof), (i) in favor of the
Arrangement and the other transactions contemplated thereby, the execution and
delivery by US Co of the Combination Agreement and the approval of the terms
thereof and each of the other actions contemplated by the Combination Agreement
and this Agreement and any actions required in furtherance thereof and hereof;
(ii) against any action or agreement that would result in a breach in any
material respect of any covenant, representation or warranty or any other
material obligation or agreement of US Co under the Combination Agreement or
this Agreement; and (iii) against the following actions (other than the
Arrangement and the transactions contemplated by the Combination Agreement): to
the extent that such are intended to, or could reasonably be expected to,
impede,  interfere with, delay, postpone, or materially adversely affect the
Arrangement or the transactions contemplated by the Combination Agreement or
this Agreement (A) any change in a majority of the persons who constitute the
board of directors of US Co; (B) any change in the present capitalization of US
Co or any amendment of US Co's Articles or Bylaws; or (C) any other a material
change in US Co's corporate structure or business.  In addition to the other
covenants and agreements of the Shareholders provided for elsewhere in this
Agreement, during the above-described period no Shareholder shall enter into
any agreement or understanding with any Person the effect of which would be
inconsistent with or violate the provisions and agreements contained in this
Section 2.  Nothing herein shall in any way restrict or limit any Shareholder
from taking any action in his capacity as a director or officer of US Co to
fulfill his duties and fiduciary obligations as a director or officer of US Co.





                                       2
<PAGE>   3
3.       COVENANTS, REPRESENTATIONS AND WARRANTIES OF THE SHAREHOLDERS

         (a)     Each Shareholder hereby severally represents, warrants and
                 covenants to Chauvco, with respect to himself and his
                 Shareholder Shares only, as follows:

                 (i)      Ownership.  Each Shareholder is either (A) the record
                          and Beneficial Owner of, or (B) the Beneficial Owner
                          but not the record holder of, the number of issued
                          and outstanding Shares set forth with respect to such
                          Shareholder on Schedule A hereto.  As of the date of
                          this Agreement, the Shares set forth on Schedule A
                          hereto constitute all of the issued and outstanding
                          Shares owned of record or Beneficially Owned by such
                          Shareholder.  Except as otherwise set forth in
                          Schedule A, such Shareholder has sole power of
                          disposition, sole power of conversion, sole power to
                          demand appraisal rights and sole power to agree to
                          all of the matters set forth in this Agreement, in
                          each case with respect to all of the Shares
                          attributable to such Shareholder set forth on
                          Schedule A hereto, with no material limitations,
                          qualifications or restrictions on such rights,
                          subject to applicable securities laws and the terms
                          of this Agreement.

                 (ii)     Power Binding Agreement.  Each Shareholder has the
                          legal capacity, power and authority to enter into and
                          perform all of such Shareholder's obligations under
                          this Agreement.  This Agreement has been duly and
                          validly executed and delivered by such Shareholder
                          and constitutes a valid and binding agreement of such
                          Shareholder, enforceable against such Shareholder in
                          accordance with its terms.  There are no
                          beneficiaries or holders of a voting trust
                          certificate or other interest of any trust of which
                          such Shareholder is a trustee whose consent is
                          required for the execution and delivery of this
                          Agreement or the consummation by such Shareholder of
                          the transactions contemplated hereby.  If such
                          Shareholder is married and such Shareholder's Shares
                          constitute community property, this Agreement has
                          been duly authorized, executed and delivered by, and
                          constitutes a valid and binding agreement of, such
                          Shareholder's spouse, enforceable against such person
                          in accordance with its terms.

                 (iii)    No Conflicts.  Other than filings that may be
                          required under the Exchange Act and such other
                          consents as are described in the Combination
                          Agreement no filing with, and no permit,
                          authorization, consent or approval of, any state or
                          federal public body or authority is necessary for the
                          execution of this Agreement by such Shareholder and
                          the consummation by such Shareholder of the
                          transactions contemplated hereby, except where the
                          failure to obtain such consent, permit,
                          authorization, approval or filing would not interfere
                          with such Shareholder's ability to perform its
                          obligations hereunder, and none of the execution and
                          delivery of this





                                       3
<PAGE>   4
                          Agreement by such Shareholder, the consummation by
                          such Shareholder of the transactions contemplated
                          hereby or compliance by such Shareholder with any of
                          the provisions hereof shall (A) result in a violation
                          or breach of, or constitute (with or without notice
                          or lapse of time or both) a default (or give rise to
                          any third party right of termination, cancellation,
                          material modification or acceleration) under any of
                          the terms, conditions or provisions of any note,
                          bond, mortgage, indenture, license, contract,
                          commitment, arrangement, understanding, agreement or
                          other instrument or obligation of any kind to which
                          such Shareholder is a party or by which such
                          Shareholder or any of its properties or assets may be
                          bound, or (B) violate any order, writ, injunction,
                          decree, judgment, order, statute, rule or regulation
                          applicable to such Shareholder or any of its
                          properties or assets, in each such case except to the
                          extent that any conflict, breach, default or
                          violation would not interfere with the ability of
                          such Shareholder to perform, the obligations
                          hereunder.

                 (iv)     No Encumbrances.  Except as required by Section 2, at
                          all times during the term hereof, all of such
                          Shareholder's Shares will be held by such
                          Shareholder, Affiliates of such Shareholder, or by
                          nominees or custodians for the benefit of such
                          Shareholder, free and clear of all liens, claims,
                          security interests, proxies, voting trusts or
                          agreement, understandings or arrangements or any
                          other liens, claims, understanding or arrangements
                          that do not limit or impair such Shareholder's
                          ability to perform its obligations under this
                          Agreement.

                 (v)      Restriction on Transfer, Proxies and
                          Non-Interference.  From and after the date of this
                          Agreement and ending as of the first to occur of the
                          Effective Time or the Termination Date, no
                          Shareholders shall, and each Shareholder shall cause
                          each of its Affiliates who Beneficially Owns any of
                          the Shareholder's Shares of such Shareholder not to,
                          directly or indirectly without the consent of
                          Chauvco: (A) offer for sale, sell, transfer, tender,
                          pledge, encumber, assign or otherwise dispose of, or
                          enter into any contract, option or other arrangement
                          or understanding with respect to or consent to the
                          offer for sale, sale, transfer, tender, pledge,
                          encumbrance, assignment or other disposition of, any
                          or all of the Shareholders' Shares of such
                          Shareholder, or any interest therein, (B) grant any
                          proxies or powers of attorney, deposit any
                          Shareholders' Shares of such Shareholder into a
                          voting trust or enter into a voting agreement with
                          respect to any Shareholders' Shares of such
                          Shareholder, (C) enter into any agreement or
                          arrangement providing for any of the actions
                          described in clause (A) or (B) above or (D) take any
                          action that could reasonably be expected to have
                          effect of preventing or disabling any Shareholder
                          from performing such Shareholder's obligations under
                          this Agreement.





                                       4
<PAGE>   5
                 (vi)     Further Assurance.  From time to time, at Chauvco's
                          reasonable request and without further consideration,
                          each Shareholder shall execute and deliver such
                          additional documents as may be necessary or desirable
                          to consummate and make effective, in the most
                          expeditious manner practicable, the transactions
                          contemplated by this Agreement.

         (b)     US Co hereby represents and warrants to Chauvco that the Board
                 of Directors of US Co has approved the terms of this Agreement
                 and the transactions contemplated herein in such a manner as
                 to satisfy the corporate laws of Delaware applicable to US Co.

4.       STOP TRANSFER

         From and after the date of this Agreement and ending as of the first
to occur of the Effective Time or the Termination Date, no Shareholder will
request that US Co register (and US Co agrees not to register) the transfer
(book- entry or otherwise) of any certificate or uncertificated interest
representing any of the Shareholders' Shares of such Shareholder, except as
contemplated by Section 3(a)(v) hereof or as otherwise contemplated hereby.

5.       RECAPITALIZATION

         In the event of a stock dividend or distribution, or any change in the
Shares (or any class thereof) by reason of any split-up, recapitalization,
combination, exchange of shares or the like, the term "Shares" shall include,
without limitation, all such stock dividends and distributions and any shares
or other securities into which or for which any or all of the Shares (or any
class thereof) may be changed or exchanged as may be appropriate to reflect
such event.

6.       MISCELLANEOUS

         (a)     Entire Agreement.  This Agreement and the Combination
                 Agreement constitute the entire agreement between the parties
                 with respect to the subject matter hereof and supersedes all
                 other prior agreements and understandings, both written and
                 oral, between the parties with respect to the subject matter
                 hereof.

         (b)     Amendments, Waivers, Etc.  This Agreement may not be amended,
                 changed, supplemented, waived or otherwise modified or
                 terminated, except upon the execution and delivery of a
                 written agreement executed by the parties hereto; provided
                 that all of the provisions of this Agreement other than
                 Sections 3(b), 4 and this Section 6(b) may be amended without
                 the consent of US Co.

         (c)     Notices.  All notices, requests, claims, demands and other
                 communications hereunder shall be in writing and shall be
                 given (and shall be deemed to have been duly received if so
                 given) by hand delivery or telecopy, or by mail (registered or





                                       5
<PAGE>   6
                 certified mail, postage prepaid, return receipt requested) or
                 by any courier service, such as Federal Express, providing
                 proof of delivery.  All communications hereunder shall be
                 delivered to the respective parties at the following addresses
                 or the addresses set forth on the signature pages hereto:

         If to
         US Co or the
         Shareholders             c/o Pioneer Natural Resources Company
                                  1400 Williams Square West
                                  5205 N. O'Connor Blvd.
                                  Irving, Texas 75039
                                  Attn.:  General Counsel
                                  Telecopy: (972) 402-7028

                                                   and

         copy to:                          Vinson & Elkins L.L.P.
                                           3700 Trammell Crow Center
                                           2001 Ross Avenue
                                           Dallas, Texas 75201-2975

                                                   and

                                           DNR - MESA Holdings L.P.
                                           777 Main Street
                                           2700 Fort Worth, Texas 76102
                                           Attn.:  Ken Hersh
                                           Telecopy: (817) 820-6650

         If to Chauvco:                    Chauvco Resources Ltd.
                                           2900, 255 - 5th Avenue S.W.
                                           Calgary, Alberta
                                           T2P 3G6
                                           Attn.:  President
                                           Telecopy: (403) 269-9497

                                                   and

         copy to:                          Bennett Jones Verchere
                                           4500, 855-2 Street S.W.
                                           Calgary, Alberta T2P 4K7
                                           Attn.:  Martin A. Lambert
                                           Telecopy: (403) 265-7219





                                       6
<PAGE>   7

or to such other address as the person to whom notice is given may have
previously furnished to the others in writing in the manner set forth above.

         (d)     Severability.  Whenever possible, each provision or portion of
                 any provision of this Agreement will be interpreted in such
                 manner as to be effective and valid under applicable law but
                 if any provision or portion of any provision of this Agreement
                 is held to be invalid, illegal or unenforceable in any respect
                 under any applicable law or rule in any jurisdiction, such
                 invalidity, illegality or unenforceability will not affect any
                 other provision or portion of any provision in such
                 jurisdiction, and this Agreement will be reformed, construed
                 and enforced in such jurisdiction as if such invalid, illegal
                 or unenforceable provision or portion of any provision had
                 never been contained herein.

         (e)     Specific Performance.  Each of the parties hereto recognizes
                 and acknowledges that a breach by any Shareholder of any
                 covenants or agreements contained in this Agreement will cause
                 Chauvco to sustain damages for which it would not have an
                 adequate remedy at law for money damages, and therefore each
                 of the parties hereto agrees that in the event of  any such
                 breach Chauvco shall be entitled to the remedy of specific
                 performance of such covenants and agreements and injunctive
                 and other equitable relief in addition to any other remedy to
                 which it may be entitled, at law or in equity.

         (f)     Remedies Cumulative.  All rights, powers and remedies provided
                 under this Agreement or otherwise available in respect hereof
                 at law or in equity shall be cumulative and not alternative,
                 and the exercise of any thereof by any party shall not
                 preclude the simultaneous or later exercise of any other such
                 right, power or remedy by such party.

         (g)     No Waiver.  The failure of any party hereto to exercise any
                 right, power or remedy provided under this Agreement or
                 otherwise available in respect hereof at law or in equity, or
                 to insist upon compliance by any other party hereto with its
                 obligations hereunder, and any custom or practice of the
                 parties at variance with the terms hereof, shall not
                 constitute a waiver by such party of its right to exercise any
                 such or other right, power or remedy or to demand such
                 compliance.

         (h)     No Third Party Beneficiaries.  This Agreement is not intended
                 to be for the benefit of, and shall not be enforceable by, any
                 person or entity who or which is not a party hereto; provided
                 that, in the event of any of the Shareholder's deaths, the
                 benefits and obligations of such Shareholder hereunder shall
                 inure to his successors and heirs.

         (i)     Governing Law.  This Agreement shall be governed and construed
                 in accordance





                                       7
<PAGE>   8
                 with the laws of Delaware.

         (i)     Jurisdiction.  Each party hereby irrevocably submits to the
                 exclusive jurisdiction of Alberta in any action, suit or
                 proceeding arising in connection with this Agreement, and
                 agrees that any such action, suit or proceeding shall be
                 brought only in such court (and waives any objection based on
                 forum non conveniens or any other objection to venue therein);
                 provided, however, that such consent to jurisdiction is solely
                 for the purpose referred to in this paragraph and shall not be
                 deemed to be a general submission to the jurisdiction of
                 Alberta other than for such purposes.

         (k)     Descriptive Headings.  The descriptive headings used herein
                 are inserted for convenience of reference only and are not
                 intended to be part of or to affect the meaning or
                 interpretation of this Agreement.

         (l)     Counterparts.  This Agreement may be executed in counterparts,
                 each of which shall be deemed to be an original, but all of
                 which, taken together, shall constitute one and the same
                 Agreement.  This Agreement shall not be effective as to any
                 party hereto until such time as this Agreement or a
                 counterpart thereof has been executed and delivered by such
                 party hereto.

7.       TERMINATION

         This Agreement shall terminate without any further action on the part
of any party hereto upon the earlier to occur of the Effective Time or the
Termination Date.  Upon such termination, this Agreement shall forthwith become
void and of no further force or effect.





                                       8
<PAGE>   9
         IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed on this 3rd day of September, 1997.

                                       PIONEER NATURAL                         
                                       RESOURCES COMPANY                       
                                                                               
                                                                               
                                       Per:                                    
                                               --------------------------------
                                                                               
                                                                               
                                       Per:                                    
                                               --------------------------------
                                                                               
                                                                               
                                       CHAUVCO RESOURCES, LTD.                 
                                                                               
                                                                               
                                       Per:                                    
                                               --------------------------------
                                                                               
                                                                               
                                       Per:                                    
                                               --------------------------------
                                                                               
                                                                               
                                       DNR - MESA HOLDINGS L.P. BY ITS         
                                       SOLE GENERAL PARTNER RAINWATER INC.     
                                                                               
                                                                               
                                       Per:                                    
                                               --------------------------------
                                               Ken Hersh, Vice-President       
                                                                               
                                                                               
                                                                               
                                                                               
- ------------------------------         ----------------------------------------
WITNESS                                SCOTT D. SHEFFIELD                      
                                                                               
                                                                               
                                                                               
                                                                               
- ------------------------------         ----------------------------------------
WITNESS                                I. JON BRUMLEY                          
                                   
                                   
                                   
                                   

                                       9


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