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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT


                       PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934


        Date of Report (Date of earliest event reported): APRIL 6, 1997


                                   MESA INC.
             (Exact name of registrant as specified in its charter)




          TEXAS                        1-10874                   75-2394500
(State or other jurisdiction    (Commission File Number)     (IRS Employer 
      of incorporation)                                      Identification No.)



      1400 WILLIAMS SQUARE WEST
     5205 NORTH O'CONNOR BOULEVARD
            IRVING, TEXAS                                      75039
(Address of principal executive offices)                     (Zip Code)




        Registrant's telephone number, including area code: 972/444-9001





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ITEM 5.  OTHER EVENTS

         On April 6, 1997, MESA Inc. ("Mesa") issued a press release (the
"Press Release") announcing that it and Parker & Parsley Petroleum Company, a
Delaware corporation ("Parker & Parsley"), had entered into an Agreement and
Plan of Merger ("Merger Agreement") to merge and create Pioneer Natural
Resources Company, a Delaware corporation. The consummation of the transactions
contemplated in the Merger Agreement is subject to the approval of the
shareholders of each of Mesa and Parker & Parsley. For additional information
regarding the transactions contemplated in the Merger Agreement, reference is
made to the Press Release, the Merger Agreement and certain other documents
entered into in connection with the Merger Agreement, copies of which are
attached hereto as exhibits and incorporated herein by reference.

         The following tables set forth certain summary pro forma condensed
consolidated financial, operating and reserve information of Mesa and Parker &
Parsley as of and for the year ended December 31, 1996.  Such information does
not give effect to the transactions contemplated in the Merger Agreement.  The
unaudited pro forma consolidated information of Mesa gives effect to the 1996
recapitalization of Mesa's balance sheet, the acquisition of all of the
outstanding equity of Greenhill Petroleum Corporation and additional borrowings
to finance such acquisition.  Such information should be read in conjunction
with Mesa's Current Report on Form 8-K dated February 7, 1997 and the
Consolidated Financial Statements of Mesa (and the related notes) included in
Mesa's Annual Report on Form 10-K for the year ended December 31, 1996.     
The unaudited pro forma consolidated information of Parker & Parsley gives
effect to (i) the sale of certain wholly-owned Australian subsidiaries to
Santos Ltd. in March 1996, (ii) the sale of Bridge Oil Timor Sea, Inc. to
Phillips Petroleum International Investment Company in June 1996 and (iii) the
aggregate effect of the sales of certain nonstrategic domestic oil and gas
properties, gas plants, contract rights and related assets sold during the
period from January 2, 1996 to December 31, 1996.  Such information should be
read in conjunction with Parker & Parsley's Form 8-K dated April 3, 1997 and
the Consolidated Financial Statements of Parker & Parsley (and the related
notes) included in Parker & Parsley's Annual Report on Form 10-K for the year
ended December 31, 1996.  




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                                     MESA
         SUMMARY PRO FORMA CONDENSED FINANCIAL OPERATING INFORMATION
                     (in thousands except per share data)
                                      




                                            
Revenues:
  Natural gas                                 $201,689  
  Natural gas liquids                           97,561
  Oil and condensate                            72,030
  Other                                         11,075
                                              --------
                                               382,355
                                              --------
Costs and expenses:
  Lease operating                               72,233
  Production and other taxes                    25,384
  Exploration charges                           12,772
  General and administrative                    31,743
  Depreciation, depletion and
  amortization                                 135,289
                                              --------
                                               277,421
                                              --------

Operating income                               104,934

Net interest expense                           (97,062)
Other income                                    24,626
                                              --------
Income from continuing operations
  before income taxes                           32,498
                                              --------
Income from continuing operations               32,498

Dividends on preferred stock                   (21,880)
                                              --------
Net income from continuing
  operations attributable to
  common                                      $ 10,618
                                              ========
Net income per
  common share                                   $0.16
                                                 =====

  Common shares                                 65,129
                                              ========


EBITDAEX(1)                                   $277,621
                                              ========



(1) EBITDAEX represents net income from continuing operations plus net
    interest expense, depreciation, depletion and amortization expense and
    exploration charges.  EBITDAEX is not presented as an indicator of
    operating performance or as a measure of liquidity.


                                             
BALANCE SHEET DATA

Cash and investments                           $    23,485
Total Assets                                     1,494,527
Long-term, debt, including current
  maturities                                     1,078,577
Stockholders' equity                               265,494

SUMMARY PRO FORMA RESERVE AND
  PRODUCTION DATA

ESTIMATED PROVED RESERVES:
  Natural gas (Bcf)                                1,079.6  
  Natural gas liquids(MMBbls)                         88.1  
  Oil and condensate (MMBbls)                         30.3  
                                                            
Present Value of future net cash                            
  flows, before income taxes,                               
  discounted at 10% (in millions)              $   2,135.9  
                                                            
PRODUCATION DATA:                                           
  Natural gas (Bcf)                                   90.0  
  Natural gas liquids (MMBbls)                         6.5  
  Oil and condensate (MMBbls)                          3.4  



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                                PARKER & PARSLEY
       SUMMARY PRO FORMA CONDENSED FINANCIAL AND OPERATING INFORMATION
                     (in thousands, except per share data)


                                     
                                         
 Revenues:                              
   Oil and gas                            $   374,560 
   Natural gas processing                      23,184 
   Interest and Other                          17,328 
                                          ----------- 
                                              415,072 
                                          ----------- 
 Costs and expenses:                    
   Oil and gas production                     101,545 
   Natural gas processing                      11,949  
   Depletion, depreciation and          
      amortization                            104,629  
   Exploration and abandonments                20,187 
   General and administrative                  26,631 
   Interest                                    40,720 
   Other                                        2,451 
                                          ----------- 
                                              308,112 
                                          ----------- 
 Income from continuing                 
   operations before income taxes             106,960 
                                        
 Income tax provision                         (37,400)
                                          ----------- 
                                        
 Income from continuing operations        $    69,560 
                                          =========== 
                                        
 Income from continuing operations      
   per share:    
      Primary                             $      2.16 
                                          =========== 
      Fully diluted                       $      1.81 
                                          =========== 

                                        
 WEIGHTED AVERAGE SHARES                
   OUTSTANDING:                         
      COMMON                                   35,734 
                                          =========== 

 EBITDA(a)                                $   272,496 
                                          =========== 

(a)      EBITDA represents income from continuing operations plus interest
         expense, income tax expense, exploration and abandonment charges, and
         depletion, depreciation and amortization expense.  EBITDA is not
         presented as an indicator of operating performance or as a measure of
         liquidity.

 BALANCE SHEET DATA                     
                                        
 Cash and investments                     $   18,711  
 Total assets                              1,199,865  
 Long-term debt, including current      
   maturities                                326,289  
 Preferred stock of subsidiary               188,820 
 Stockholders' equity                        530,296 

 SUMMARY PRO FORMA RESERVE AND         
   PRODUCTION DATA                      
 ESTIMATED PROVED RESERVES:             
   Natural gas (Bcf)                           829.4 
   Oil and condensate (MMBbls)                 163.9 
                                        
 Present value of future net cash       
   flows, before income taxes,          
   discounted at 10% (in millions)        $  2,345.4 
                                        
 PRODUCTION DATA:                       
   Natural gas (Bcf)                            70.7 
   Oil and condensate (MMBbls)                  10.7 





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        On Friday, April 4, 1997, MESA had outstanding 64,279,568, 61,651,163 
and 62,424,436 shares of common stock, Series A 8% Cumulative Convertible
Preferred Stock ("Series A Preferred Stock") and Series B 8% Cumulative
Convertible Preferred Stock ("Series B Preferred Stock"), respectively. The New
York Stock Exchange closing prices per share of MESA's common stock and Series
A Preferred Stock on such date were $5.75 and $7.25, respectively. MESA's
Series B Preferred Stock is not listed on an exchange. On the same date, Parker
& Parsley had 35,047,050 shares of common stock outstanding, and its New York
Stock Exchange closing price was $29.875 per share.

        The Current Report on Form 8-K includes forward-looking statements
within the meaning of Section 27A of the Securities Act of 1933 and Section 21E
of the Securities Exchange Act of 1934. Such forward-looking statements
include, without limitation, estimates with respect to reserves and production
levels. Although MESA and Parker & Parsley believe that the expectations
reflected in such forward-looking statements are reasonable, Mesa
can give no assurance that such expectations will prove to have been correct.
Forward-looking statements are qualified as may be provided in Mesa's and
Parker & Parsley's annual, quarterly and current reports and registration
statements filed with the Securities and Exchange Commission.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

(c)     Exhibits

        2.1        Agreement and Plan of Merger dated as of April 6,
                   1997 among MESA Inc., MESA Operating Co., MXP
                   Reincorporation Corp., and Parker & Parsley
                   Petroleum Company.
                
        2.2        Shareholders Agreement dated as of April 6, 1997 by
                   and between MESA Inc. and DNR-MESA Holdings, L.P.

        2.3        Letter Agreement dated April 6, 1997 between Parker
                   & Parsley Petroleum Company and DNR-MESA Holdings,
                   L.P.
                
        2.4        Shareholder Agreement dated as of April 6, 1997 by
                   and between Boone Pickens and Parker & Parsley
                   Petroleum Company.
                
         99        Press release issued on April 6, 1997 relating to
                   the Merger Agreement.





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                                   SIGNATURE

                 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 hereunto duly authorized.


                                        MESA INC.
                                        
                                        
                                        
                                        
Date: April 7, 1997                     By: /s/ STEPHEN K. GARDNER
                                            --------------------------------
                                            Stephen K. Gardner
                                            Senior Vice President and
                                            Chief Financial Officer





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                               INDEX TO EXHIBIT




      EXHIBITS                      TITLE
      --------                      -----

        2.1        Agreement and Plan of Merger dated as of April 6,
                   1997 among MESA Inc., MESA Operating Co., MXP
                   Reincorporation Corp., and Parker & Parsley
                   Petroleum Company
                
        2.2        Shareholders Agreement dated as of April 6, 1997 by
                   and between MESA Inc. and DNR-MESA Holdings, L.P.

        2.3        Letter Agreement dated April 6, 1997 between Parker
                   & Parsley Petroleum Company and DNR-MESA Holdings,
                   L.P.
                
        2.4        Shareholders Agreement dated as of April 6, 1997 by
                   and between Boone Pickens and Parker & Parsley
                   Petroleum Company.
                
         99        Press release issued on April 6, 1997 relating to
                   the Merger Agreement.