USX CORP
8-K, 1998-07-16
PETROLEUM REFINING
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<PAGE>
                                 UNITED STATES
                       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):
                                 July 13, 1998
 
                                USX Corporation
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                       <C>           <C>
        Delaware             1-5153        25-0996816
 -----------------------  ------------  -----------------
    (State or other       (Commission     (IRS Employer
    jurisdiction of       File Number)   Identification
     incorporation)                           No.)
 
   600 Grant Street, Pittsburgh, PA        15219-4776
 -------------------------------------  -----------------
   (Address of principal executive         (zip code)
               offices)
</TABLE>
 
                                 (412) 433-1121
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)
<PAGE>
ITEM 5. OTHER EVENTS
 
    On May 29, 1998, USX Corporation announced that its Marathon Oil Company
("Marathon") subsidiary had entered into an agreement to acquire Tarragon Oil
and Gas Limited ("Tarragon"), a Canadian corporation. A special meeting of
Tarragon securityholders is scheduled to be held on August 11, 1998, to request
securityholder approval of the proposed transaction whereby a Canadian
subsidiary of Marathon would acquire all of the issued and outstanding
securities of Tarragon. The board of directors of Tarragon has recommended that
securityholders vote to approve the transaction. The transaction is also subject
to approval by the Ontario Court (General Division), Ontario, Canada.
 
    On July 13, 1998, Tarragon mailed its Notice of Special Meeting, Notice of
Motion and Information Circular ("Tarragon Information Circular") relating to
the special meeting of securityholders. Financial information related to the
acquisition of Tarragon by Marathon is not required under the materiality
requirements of the applicable sections of the Securities Exchange Act of 1934
or the Securities Act of 1933. However, unaudited pro forma financial statements
of the USX-Marathon Group, USX Corporation and Tarragon were included as
Appendix M in the Tarragon Information Circular. A copy of Appendix M is filed
herewith as an exhibit for the benefit of U.S. investors and shareholders of USX
Corporation.
 
ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS
 
    (c) Exhibits
 
    99. Unaudited Pro Forma Financial Statements excerpted from the Tarragon
       Information Circular
 
                                   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.
 
<TABLE>
<S>        <C>
USX CORPORATION
 
By:        /s/ Kenneth L. Matheny
           -------------------------------------
           Kenneth L. Matheny
           Vice President and Comptroller
 
Dated:  July 16, 1998
</TABLE>

<PAGE>
EXHIBIT 99.
 
                                   APPENDIX M
                    UNAUDITED PRO FORMA FINANCIAL STATEMENTS
 
                                      M-1
<PAGE>
               INDEX TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                                    PAGE
                                                                                                                  ---------
<S>                                                                                                               <C>
EXPLANATORY NOTE................................................................................................  M-3
 
UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS OF MARATHON GROUP:
  Unaudited Pro Forma Combined Balance Sheet as of March 31, 1998...............................................  M-5
  Unaudited Pro Forma Combined Balance Sheet as of December 31, 1997............................................  M-6
  Unaudited Pro Forma Combined Statement of Operations for the three months ended
    March 31, 1998..............................................................................................  M-7
  Unaudited Pro Forma Combined Statement of Operations for the year ended December 31, 1997.....................  M-8
  Unaudited Pro Forma Balance Sheet as of December 31, 1997.....................................................  M-9
  Unaudited Pro Forma Statement of Operations for the year ended December 31, 1997..............................  M-10
 
UNAUDITED PRO FORMA COMBINED CONSOLIDATED FINANCIAL STATEMENTS OF USX CORPORATION:
  Unaudited Pro Forma Combined Consolidated Balance Sheet as of March 31, 1998..................................  M-11
  Unaudited Pro Forma Combined Consolidated Balance Sheet as of December 31, 1997...............................  M-12
  Unaudited Pro Forma Combined Consolidated Statement of Operations for the three months ended March 31, 1998...  M-13
  Unaudited Pro Forma Combined Consolidated Statement of Operations for the year ended December 31, 1997........  M-14
  Unaudited Pro Forma Consolidated Balance Sheet as of December 31, 1997........................................  M-15
  Unaudited Pro Forma Consolidated Statement of Operations for the year ended
    December 31, 1997...........................................................................................  M-16
 
UNAUDITED PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS OF TARRAGON OIL AND GAS, LTD.:
  Unaudited Pro Forma Consolidated Balance Sheet as of March 31, 1998...........................................  M-17
  Unaudited Pro Forma Consolidated Balance Sheet as of December 31, 1997........................................  M-18
  Unaudited Pro Forma Consolidated Statement of Operations for the three months ended March 31, 1998............  M-19
  Unaudited Pro Forma Consolidated Statement of Operations for the year ended
    December 31, 1997...........................................................................................  M-20
 
NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS...............................................................  M-21
</TABLE>
 
                                      M-2
<PAGE>
                                EXPLANATORY NOTE
 
    Unless otherwise defined herein, the capitalized terms used in this
explanatory note, the following unaudited pro forma financial statements and the
notes appended thereto are as defined in the Glossary of Terms to the
Information Circular. UNLESS OTHERWISE INDICATED, ALL AMOUNTS ARE REPORTED IN
U.S. DOLLARS.
 
    USX Corporation ("USX") is a diversified company which is principally
engaged in the energy business through its Marathon Group and in the steel
business through its U. S. Steel Group. USX has two classes of common stock,
USX-Marathon Group Common Stock ("Marathon Stock") and USX-U. S. Steel Group
Common Stock ("Steel Stock"). Each class of Common Stock is intended to provide
stockholders of that class with a separate security reflecting the performance
of the related group.
 
    The financial statements of the Marathon Group include the financial
position and results of operations for the businesses of Marathon Oil Company
("Marathon") and certain other subsidiaries of USX, and a portion of the
corporate assets and liabilities and related transactions which are not
separately identified with ongoing operating units of USX. The Marathon Group
financial statements are prepared using the amounts included in the USX
consolidated financial statements.
 
    Although the financial statements of the Marathon Group and the U. S. Steel
Group separately report the assets, liabilities (including contingent
liabilities) and stockholders' equity of USX attributed to each such group, such
attribution of assets, liabilities (including contingent liabilities) and
stockholders' equity among the Marathon Group and the U. S. Steel Group for the
purpose of preparing their respective financial statements does not affect legal
title to such assets or responsibility for such liabilities. Holders of Marathon
Stock and Steel Stock are holders of common stock of USX and continue to be
subject to all the risks associated with an investment in USX and all of its
businesses and liabilities. Financial impacts arising from one Group that affect
the overall cost of USX's capital could affect the results of operations and
financial condition of the other Group. In addition, net losses of either Group,
as well as dividends and distributions on any class of USX Common Stock or
series of preferred stock and repurchases of any class of USX Common Stock or
series of preferred stock at prices in excess of par or stated value, will
reduce the funds of USX legally available for payment of dividends on both
classes of Common Stock. Accordingly, the USX consolidated financial information
should be read in connection with the Marathon Group financial information.
 
    The unaudited pro forma combined financial statements of the Marathon Group
(pages M-5 through M-8) and USX (pages M-11 through M-14) have been prepared
assuming the Tarragon acquisition is accounted for as a purchase of Tarragon Oil
and Gas Limited ("Tarragon") by Marathon under U.S. GAAP. USX follows the
successful efforts method of accounting for oil and gas exploration and
development. Tarragon follows the full cost method of accounting for exploration
and development. Pro forma adjustments to conform the unaudited pro forma
consolidated financial statements of Tarragon to the successful efforts method,
as well as pro forma adjustments to conform Tarragon's unaudited pro forma
consolidated financial statements from Canadian GAAP to U.S. GAAP, are presented
in the unaudited pro forma combined financial statements of USX and the Marathon
Group. Additionally, under U.S. GAAP, the functional currency for Tarragon has
been assumed to be the U.S. dollar for financial statement reporting purposes.
 
    The unaudited pro forma financial statements of the Marathon Group (pages
M-9 and M-10) and USX (pages M-15 and M-16) for the periods presented have been
prepared by USX to give effect to the January 1, 1998 acquisition of Ashland
RM&T, as described in Note 1.
 
    The unaudited pro forma consolidated financial statements of Tarragon (pages
M-17 through M-20) for the periods presented have been prepared by Tarragon to
give effect to the April 15, 1998 acquisition of Unocal Canada as described in
Note 1. The historical consolidated financial statements of Tarragon, which are
incorporated by reference in this Information Circular, were prepared under
Canadian GAAP and in Canadian dollars. In the unaudited pro forma consolidated
financial statements of Tarragon, the historical consolidated financial
statements of Tarragon have been converted to U.S. dollars using the period end
exchange rate for the balance sheets and the average exchange rate for the
statements of operations for the respective periods. In addition, certain
reclassifications have been made to the historical consolidated financial
statements of Tarragon to conform with USX's financial statement presentation.
 
                                      M-3
<PAGE>
    The unaudited pro forma balance sheets as of March 31, 1998 and statements
of operations for the three months ended March 31, 1998 of USX and the Marathon
Group are based on the unaudited financial statements of USX and the Marathon
Group which include, in the opinion of USX management, all adjustments necessary
to present fairly the results for such periods. The unaudited pro forma balance
sheets as of December 31, 1997 and statements of operations for the year ended
December 31, 1997 of USX and the Marathon Group have been derived from, and
should be read in conjunction with, the audited financial statements of USX and
the Marathon Group and the related notes thereto included in this Information
Circular.
 
    The unaudited pro forma balance sheet as of March 31, 1998 and statement of
operations for the three months ended March 31, 1998 of Tarragon are based on
the unaudited financial statements of Tarragon which include, in the opinion of
Tarragon management, all adjustments necessary to present fairly the results for
such periods. The unaudited pro forma balance sheet as of December 31, 1997 and
statement of operations for the year ended December 31, 1997 of Tarragon have
been derived from, and should be read in conjunction with, the audited financial
statements of Tarragon and the related notes thereto incorporated by reference
in this Information Circular.
 
    The unaudited pro forma financial statements are presented for illustrative
purposes only and are not necessarily indicative of actual results of operations
or financial position that would have been achieved had the Tarragon, Unocal and
Ashland RM&T acquisitions been consummated at the dates of, for the periods
presented, nor are they necessarily indicative of future results or financial
positions.
 
                                      M-4
<PAGE>
                               USX-MARATHON GROUP
 
                   UNAUDITED PRO FORMA COMBINED BALANCE SHEET
 
                              AS OF MARCH 31, 1998
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                                 PRO FORMA
                                                                                                                 COMBINED
                                                                        MARATHON   PRO FORMA      PRO FORMA      MARATHON
                                                                         GROUP     TARRAGON      ADJUSTMENTS       GROUP
                                                                        --------   ---------   ----------------  ---------
<S>                                                                     <C>        <C>         <C>    <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................  $   475      $--       $--                $   475
  Cash in trust.......................................................    --            7         (7) (a)           --
  Receivables, less allowance for doubtful accounts...................    1,321        33       --                  1,354
  Inventories.........................................................    1,641         8       --                  1,649
  Other current assets................................................      223      --         --                    223
                                                                        --------   ---------   -----             ---------
    Total current assets..............................................    3,660        48         (7)               3,701
 
Investments and long-term receivables, less reserves..................      557      --         --                    557
Property, plant and equipment--net....................................    9,026       919        259  (d)          10,204
Prepaid pensions......................................................      294      --         --                    294
Other noncurrent assets...............................................      221         3          7  (a)             228
                                                                                                  (3) (b)
                                                                        --------   ---------   -----             ---------
    Total assets......................................................  $13,758      $970      $ 256              $14,984
                                                                        --------   ---------   -----             ---------
                                                                        --------   ---------   -----             ---------
LIABILITIES
Current liabilities:
  Accounts payable....................................................  $ 2,204      $ 44      $   7  (c)         $ 2,255
  Payroll and benefits payable........................................      173      --         --                    173
  Accrued taxes.......................................................      128      --         --                    128
  Deferred income taxes...............................................       61      --         --                     61
  Accrued interest....................................................       50      --         --                     50
  Long-term debt due within one year..................................      462      --         --                    462
                                                                        --------   ---------   -----             ---------
    Total current liabilities.........................................    3,078        44          7                3,129
 
Long-term debt, less unamortized discount.............................    2,837       354        504  (i)           3,695
Long-term deferred income taxes.......................................    1,364        71        197  (e)           1,418
                                                                                                (214) (f)
Employee benefits.....................................................      536      --         --                    536
Deferred credits and other liabilities................................      331        10         (5) (h)             336
Preferred stock of subsidiary.........................................      184      --         --                    184
Minority interest in Marathon Ashland Petroleum LLC...................    1,682      --         --                  1,682
 
STOCKHOLDERS' EQUITY..................................................    3,746       491       (491) (g)           4,004
                                                                                                 258  (j)
                                                                        --------   ---------   -----             ---------
    Total liabilities and stockholders' equity........................  $13,758      $970      $ 256              $14,984
                                                                        --------   ---------   -----             ---------
                                                                        --------   ---------   -----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-5
<PAGE>
                               USX-MARATHON GROUP
 
                   UNAUDITED PRO FORMA COMBINED BALANCE SHEET
 
                            AS OF DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                                  PRO FORMA
                                                                        PRO FORMA                                 COMBINED
                                                                        MARATHON    PRO FORMA      PRO FORMA      MARATHON
                                                                          GROUP     TARRAGON      ADJUSTMENTS       GROUP
                                                                        ---------   ---------   ----------------  ---------
<S>                                                                     <C>         <C>         <C>    <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................   $    49      $--       $--                $    49
  Cash in trust.......................................................     --           10        (10) (a)           --
  Receivables, less allowance for doubtful accounts...................     1,490        42       --                  1,532
  Inventories.........................................................     1,563         9       --                  1,572
  Other current assets................................................       170      --         --                    170
                                                                        ---------   ---------   -----             ---------
    Total current assets..............................................     3,272        61        (10)               3,323
 
Investments and long-term receivables, less reserves..................       522      --         --                    522
Property, plant and equipment--net....................................     9,120       888        258  (d)          10,266
Prepaid pensions......................................................       290      --         --                    290
Other noncurrent assets...............................................       261         3         10  (a)             271
                                                                                                   (3) (b)
                                                                        ---------   ---------   -----             ---------
    Total assets......................................................   $13,465      $952      $ 255              $14,672
                                                                        ---------   ---------   -----             ---------
                                                                        ---------   ---------   -----             ---------
 
LIABILITIES
Current liabilities:
  Notes payable.......................................................   $   108      $--       $--                $   108
  Accounts payable....................................................     2,141        41          7  (c)           2,189
  Payroll and benefits payable........................................       174      --         --                    174
  Accrued taxes.......................................................       110      --         --                    110
  Deferred income taxes...............................................        61      --         --                     61
  Accrued interest....................................................        84      --         --                     84
  Long-term debt due within one year..................................       417      --         --                    417
                                                                        ---------   ---------   -----             ---------
    Total current liabilities.........................................     3,095        41          7                3,143
 
Long-term debt, less unamortized discount.............................     2,476       346        501  (i)           3,323
Long-term deferred income taxes.......................................     1,414        70        196  (e)           1,467
                                                                                                 (213) (f)
Employee benefits.....................................................       529      --         --                    529
Deferred credits and other liabilities................................       342         9         (5) (h)             346
Preferred stock of subsidiary.........................................       184      --         --                    184
Minority interest in Marathon Ashland Petroleum LLC...................     1,654      --         --                  1,654
 
STOCKHOLDERS' EQUITY..................................................     3,771       486       (486) (g)           4,026
                                                                                                  255  (j)
                                                                        ---------   ---------   -----             ---------
    Total liabilities and stockholders' equity........................   $13,465      $952      $ 255              $14,672
                                                                        ---------   ---------   -----             ---------
                                                                        ---------   ---------   -----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-6
<PAGE>
                               USX-MARATHON GROUP
 
              UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS
 
                       THREE MONTHS ENDED MARCH 31, 1998
 
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                                                PRO FORMA
                                                                                                                COMBINED
                                                                        MARATHON   PRO FORMA      PRO FORMA     MARATHON
                                                                         GROUP     TARRAGON      ADJUSTMENTS      GROUP
                                                                        --------   ---------   ---------------  ---------
<S>                                                                     <C>        <C>         <C>   <C>        <C>
REVENUES:
  Sales...............................................................  $ 5,224       $42      $--               $ 5,266
  Dividend and affiliate income.......................................       10      --         --                    10
  Gain on disposal of assets..........................................        3      --         --                     3
  Gain on ownership change in Marathon Ashland Petroleum LLC..........      248      --         --                   248
  Other income........................................................       13      --         --                    13
                                                                        --------      ---      ----             ---------
    Total revenues....................................................    5,498        42       --                 5,540
                                                                        --------      ---      ----             ---------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)..........................    3,822        11       --                 3,833
  Selling, general and administrative expenses........................      131         1       --                   132
  Depreciation, depletion and amortization............................      270        22         3  (p)             295
  Taxes other than income taxes.......................................      816      --         --                   816
  Exploration expenses................................................       82      --           4  (n)              86
  Inventory market valuation credits..................................      (25)     --         --                   (25)
                                                                        --------      ---      ----             ---------
    Total costs and expenses..........................................    5,096        34         7                5,137
                                                                        --------      ---      ----             ---------
INCOME FROM OPERATIONS................................................      402         8        (7)                 403
Net interest and other financial costs................................       54         5         8  (o)              67
Minority interest in income of Marathon Ashland Petroleum LLC.........       54      --         --                    54
                                                                        --------      ---      ----             ---------
INCOME BEFORE INCOME TAXES............................................      294         3       (15)                 282
Provision for estimated income taxes..................................      111         2        (6) (r)             107
                                                                        --------      ---      ----             ---------
NET INCOME............................................................  $   183       $ 1      $ (9)             $   175
                                                                        --------      ---      ----             ---------
                                                                        --------      ---      ----             ---------
MARATHON STOCK DATA:
  Net income per share:
    Basic.............................................................  $   .63                                  $   .59
    Diluted...........................................................      .63                                      .59
  Weighted average shares (in thousands):
    Basic.............................................................  288,846                                  296,205
    Diluted...........................................................  289,490                                  296,849
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-7
<PAGE>
                               USX-MARATHON GROUP
 
              UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1997
 
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                                                 PRO FORMA
                                                                        PRO FORMA                                COMBINED
                                                                        MARATHON    PRO FORMA      PRO FORMA     MARATHON
                                                                          GROUP     TARRAGON      ADJUSTMENTS      GROUP
                                                                        ---------   ---------   ---------------  ---------
<S>                                                                     <C>         <C>         <C>   <C>        <C>
REVENUES:
  Sales...............................................................  $ 22,943      $225      $--              $ 23,168
  Dividend and affiliate income.......................................        41      --         --                    41
  Gain on disposal of assets..........................................        37      --         --                    37
  Other income........................................................        87      --         --                    87
                                                                        ---------   ---------   ----             ---------
    Total revenues....................................................    23,108       225       --                23,333
                                                                        ---------   ---------   ----             ---------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)..........................    15,853        51         6  (n)          15,910
  Selling, general and administrative expenses........................       834         6         3  (n)             843
  Depreciation, depletion and amortization............................       754        90        16  (p)             857
                                                                                                  (3) (q)
  Taxes other than income taxes.......................................     3,933      --         --                 3,933
  Exploration expenses................................................       189      --          21  (n)             210
  Inventory market valuation charges..................................       416      --         --                   416
                                                                        ---------   ---------   ----             ---------
    Total costs and expenses..........................................    21,979       147        43               22,169
                                                                        ---------   ---------   ----             ---------
INCOME FROM OPERATIONS................................................     1,129        78       (43)               1,164
Net interest and other financial costs................................       260        16        31  (o)             312
                                                                                                   5  (s)
Minority interest in income of Marathon Ashland Petroleum LLC.........       173      --         --                   173
                                                                        ---------   ---------   ----             ---------
INCOME BEFORE INCOME TAXES............................................       696        62       (79)                 679
Provision for estimated income taxes..................................       225        24       (33) (r)             216
                                                                        ---------   ---------   ----             ---------
NET INCOME............................................................  $    471      $ 38      $(46)            $    463
                                                                        ---------   ---------   ----             ---------
                                                                        ---------   ---------   ----             ---------
 
MARATHON STOCK DATA:
  Net income per share:
    Basic.............................................................  $   1.64                                 $   1.57
    Diluted...........................................................      1.63                                     1.56
  Weighted average shares (in thousands):
    Basic.............................................................   288,038                                  295,332
    Diluted...........................................................   290,520                                  297,814
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-8
<PAGE>
                               USX-MARATHON GROUP
 
                       UNAUDITED PRO FORMA BALANCE SHEET
 
                            AS OF DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                          PRO FORMA     PRO FORMA
                                                                        MARATHON GROUP   ADJUSTMENTS  MARATHON GROUP
                                                                        --------------   -----------  --------------
<S>                                                                     <C>              <C>     <C>  <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................     $    36       $   13  (k)     $    49
  Receivables, less allowance for doubtful accounts...................         856          634  (k)       1,490
  Inventories.........................................................         980          583  (k)       1,563
  Other current assets................................................         146           24  (k)         170
                                                                           -------       ------          -------
    Total current assets..............................................       2,018        1,254            3,272
 
Investments and long-term receivables, less reserves..................         455           67  (k)         522
Property, plant and equipment--net....................................       7,566        1,554  (k)       9,120
Prepaid pensions......................................................         290         --                290
Other noncurrent assets...............................................         236           25  (k)         261
                                                                           -------       ------          -------
    Total assets......................................................     $10,565       $2,900          $13,465
                                                                           -------       ------          -------
                                                                           -------       ------          -------
 
LIABILITIES
Current liabilities:
  Notes payable.......................................................     $   108       $ --            $   108
  Accounts payable....................................................       1,348          793  (k)       2,141
  Payroll and benefits payable........................................         142           32  (k)         174
  Accrued taxes.......................................................         102            8  (k)         110
  Deferred income taxes...............................................          61         --                 61
  Accrued interest....................................................          84         --                 84
  Long-term debt due within one year..................................         417         --                417
                                                                           -------       ------          -------
    Total current liabilities.........................................       2,262          833            3,095
Long-term debt, less unamortized discount.............................       2,476         --              2,476
Long-term deferred income taxes.......................................       1,318            3  (k)       1,414
                                                                                             93  (l)
Employee benefits.....................................................         375          154  (k)         529
Deferred credits and other liabilities................................         332           10  (k)         342
Preferred stock of subsidiary.........................................         184         --                184
Minority interest in Marathon Ashland Petroleum LLC...................      --            1,654  (m)       1,654
 
STOCKHOLDERS' EQUITY..................................................       3,618          153  (l)       3,771
                                                                           -------       ------          -------
    Total liabilities and stockholders' equity........................     $10,565       $2,900          $13,465
                                                                           -------       ------          -------
                                                                           -------       ------          -------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-9
<PAGE>
                               USX-MARATHON GROUP
 
                  UNAUDITED PRO FORMA STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1997
 
                    (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                         ASHLAND    PRO FORMA     PRO FORMA
                                                                        MARATHON GROUP    RM&T     ADJUSTMENTS  MARATHON GROUP
                                                                        --------------   -------   -----------  --------------
<S>                                                                     <C>              <C>       <C>     <C>  <C>
REVENUES:
  Sales...............................................................     $15,668       $6,518    $ (369) (t)     $22,943
                                                                                                    1,126  (u)
  Dividend and affiliate income.......................................          36            5      --                 41
  Gain on disposal of assets..........................................          37         --        --                 37
  Other income........................................................          13           74      --                 87
                                                                           -------       -------   ------          -------
    Total revenues....................................................      15,754        6,597       757           23,108
                                                                           -------       -------   ------          -------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)..........................      10,392        4,721      (369) (t)      15,853
                                                                                                    1,126  (u)
                                                                                                      (17) (v)
  Selling, general and administrative expenses........................         355          479      --                834
  Depreciation, depletion and amortization............................         664          162       (72) (w)         754
  Taxes other than income taxes.......................................       2,938          995      --              3,933
  Exploration expenses................................................         189         --        --                189
  Inventory market valuation charges..................................         284         --         132  (x)         416
                                                                           -------       -------   ------          -------
    Total costs and expenses..........................................      14,822        6,357       800           21,979
                                                                           -------       -------   ------          -------
INCOME FROM OPERATIONS................................................         932          240       (43)           1,129
Net interest and other financial costs................................         260         --        --                260
Minority interest in income of Marathon Ashland Petroleum LLC.........      --             --         173  (y)         173
                                                                           -------       -------   ------          -------
INCOME BEFORE INCOME TAXES............................................         672          240      (216)             696
Provision for estimated income taxes..................................         216         --           9  (z)         225
                                                                           -------       -------   ------          -------
NET INCOME............................................................     $   456       $  240    $ (225)         $   471
                                                                           -------       -------   ------          -------
                                                                           -------       -------   ------          -------
MARATHON STOCK DATA:
  Net income per share:
    Basic.............................................................     $  1.59                                 $  1.64
    Diluted...........................................................        1.58                                    1.63
  Weighted average shares (in thousands):
    Basic.............................................................     288,038                                 288,038
    Diluted...........................................................     290,520                                 290,520
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-10
<PAGE>
                                USX CORPORATION
 
            UNAUDITED PRO FORMA COMBINED CONSOLIDATED BALANCE SHEET
 
                              AS OF MARCH 31, 1998
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                               PRO FORMA
                                                                                 PRO FORMA      PRO FORMA      COMBINED
                                                                          USX    TARRAGON      ADJUSTMENTS        USX
                                                                        -------  ---------   ----------------  ---------
<S>                                                                     <C>      <C>         <C>    <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................  $   487    $--       $--                $   487
  Cash in trust.......................................................    --          7         (7) (a)           --
  Receivables, less allowance for doubtful accounts...................    1,826      33       --                  1,859
  Inventories.........................................................    2,359       8       --                  2,367
  Deferred income tax benefits........................................      229    --         --                    229
  Other current assets................................................      172    --         --                    172
                                                                        -------  ---------   -----             ---------
    Total current assets..............................................    5,073      48         (7)               5,114
 
Investments and long-term receivables, less reserves..................    1,201    --         --                  1,201
Property, plant and equipment--net....................................   11,501     919        259  (d)          12,679
Prepaid pensions......................................................    2,308    --         --                  2,308
Other noncurrent assets...............................................      259       3          7  (a)             266
                                                                                                (3) (b)
                                                                        -------  ---------   -----             ---------
    Total assets......................................................  $20,342    $970      $ 256              $21,568
                                                                        -------  ---------   -----             ---------
                                                                        -------  ---------   -----             ---------
 
LIABILITIES
Current liabilities:
  Accounts payable....................................................  $ 2,854    $ 44      $   7  (c)         $ 2,905
  Payroll and benefits payable........................................      537    --         --                    537
  Accrued taxes.......................................................      331    --         --                    331
  Accrued interest....................................................       58    --         --                     58
  Long-term debt due within one year..................................      518    --         --                    518
                                                                        -------  ---------   -----             ---------
    Total current liabilities.........................................    4,298      44          7                4,349
 
Long-term debt, less unamortized discount.............................    3,313     354        504  (i)           4,171
Long-term deferred income taxes.......................................    1,443      71        197  (e)           1,497
                                                                                              (214) (f)
Employee benefits.....................................................    2,872    --         --                  2,872
Deferred credits and other liabilities................................      707      10         (5) (h)             712
Preferred stock of subsidiary.........................................      250    --         --                    250
USX obligated mandatorily redeemable convertible preferred
  securities..........................................................      182    --         --                    182
Minority interest in Marathon Ashland Petroleum LLC...................    1,682    --         --                  1,682
 
STOCKHOLDERS' EQUITY
Preferred stock.......................................................        3    --         --                      3
Common stocks.........................................................      376    --         --                    376
Exchangeable Shares...................................................    --       --            7  (j)               7
Additional paid-in capital............................................    3,931     404       (404) (g)           4,182
                                                                                               251  (j)
Retained earnings.....................................................    1,323      87        (87) (g)           1,323
Accumulated other comprehensive loss..................................      (36)   --         --                    (36)
Deferred compensation adjustments.....................................       (2)   --         --                     (2)
                                                                        -------  ---------   -----             ---------
    Total stockholders' equity........................................    5,595     491       (233)               5,853
                                                                        -------  ---------   -----             ---------
    Total liabilities and stockholders' equity........................  $20,342    $970      $ 256              $21,568
                                                                        -------  ---------   -----             ---------
                                                                        -------  ---------   -----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-11
<PAGE>
                                USX CORPORATION
 
            UNAUDITED PRO FORMA COMBINED CONSOLIDATED BALANCE SHEET
 
                            AS OF DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                                  PRO FORMA
                                                                        PRO FORMA   PRO FORMA      PRO FORMA      COMBINED
                                                                           USX      TARRAGON      ADJUSTMENTS        USX
                                                                        ---------   ---------   ----------------  ---------
<S>                                                                     <C>         <C>         <C>    <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................   $    67      $--       $--                $    67
  Cash in trust.......................................................     --           10        (10) (a)           --
  Receivables, less allowance for doubtful accounts...................     2,051        42       --                  2,093
  Inventories.........................................................     2,268         9       --                  2,277
  Deferred income tax benefits........................................       229      --         --                    229
  Other current assets................................................       111      --         --                    111
                                                                        ---------   ---------   -----             ---------
    Total current assets..............................................     4,726        61        (10)               4,777
 
Investments and long-term receivables, less reserves..................     1,095      --         --                  1,095
Property, plant and equipment--net....................................    11,616       888        258  (d)          12,762
Prepaid pensions......................................................     2,247      --         --                  2,247
Other noncurrent assets...............................................       305         3         10  (a)             315
                                                                                                   (3) (b)
Cash restricted for redemption of Delhi Stock.........................       195      --         --                    195
                                                                        ---------   ---------   -----             ---------
    Total assets......................................................   $20,184      $952      $ 255              $21,391
                                                                        ---------   ---------   -----             ---------
                                                                        ---------   ---------   -----             ---------
LIABILITIES
Current liabilities:
  Notes payable.......................................................   $   121      $--       $--                $   121
  Accounts payable....................................................     2,804        41          7  (c)           2,852
  Payroll and benefits payable........................................       553      --         --                    553
  Accrued taxes.......................................................       312      --         --                    312
  Accrued interest....................................................        95      --         --                     95
  Long-term debt due within one year..................................       471      --         --                    471
                                                                        ---------   ---------   -----             ---------
    Total current liabilities.........................................     4,356        41          7                4,404
 
Long-term debt, less unamortized discount.............................     2,932       346        501  (i)           3,779
Long-term deferred income taxes.......................................     1,449        70        196  (e)           1,502
                                                                                                 (213) (f)
Employee benefits.....................................................     2,867      --         --                  2,867
Deferred credits and other liabilities................................       746         9         (5) (h)             750
Preferred stock of subsidiary.........................................       250      --         --                    250
USX obligated mandatorily redeemable convertible preferred
  securities..........................................................       182      --         --                    182
Minority interest in Marathon Ashland Petroleum LLC...................     1,654      --         --                  1,654
Redeemable Delhi Stock................................................       195      --         --                    195
 
STOCKHOLDERS' EQUITY
Preferred stock.......................................................         3      --         --                      3
Common stocks.........................................................       375      --         --                    375
Exchangeable Shares...................................................     --         --            7  (j)               7
Additional paid-in capital............................................     3,924       400       (400) (g)           4,172
                                                                                                  248  (j)
Retained earnings.....................................................     1,291        86        (86) (g)           1,291
Other equity adjustments..............................................       (40)     --         --                    (40)
                                                                        ---------   ---------   -----             ---------
    Total stockholders' equity........................................     5,553       486       (231)               5,808
                                                                        ---------   ---------   -----             ---------
    Total liabilities and stockholders' equity........................   $20,184      $952      $ 255              $21,391
                                                                        ---------   ---------   -----             ---------
                                                                        ---------   ---------   -----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-12
<PAGE>
                                USX CORPORATION
 
       UNAUDITED PRO FORMA COMBINED CONSOLIDATED STATEMENT OF OPERATIONS
 
                       THREE MONTHS ENDED MARCH 31, 1998
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                              PRO FORMA
                                                                                PRO FORMA      PRO FORMA      COMBINED
                                                                         USX    TARRAGON      ADJUSTMENTS        USX
                                                                        ------  ---------   ----------------  ---------
<S>                                                                     <C>     <C>         <C>    <C>        <C>
REVENUES:
  Sales...............................................................  $6,887     $42      $--                $6,929
  Dividend and affiliate income.......................................      25    --         --                    25
  Gain on disposal of assets..........................................      14    --         --                    14
  Gain on ownership change in Marathon Ashland Petroleum LLC..........     248    --         --                   248
  Other income........................................................      13    --         --                    13
                                                                        ------     ---      -----             ---------
    Total revenues....................................................   7,187      42       --                 7,229
                                                                        ------     ---      -----             ---------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)..........................   5,270      11       --                 5,281
  Selling, general and administrative expenses........................      85       1       --                    86
  Depreciation, depletion and amortization............................     347      22          3  (p)            372
  Taxes other than income taxes.......................................     864    --         --                   864
  Exploration expenses................................................      82    --            4  (n)             86
  Inventory market valuation credits..................................     (25)   --         --                   (25)
                                                                        ------     ---      -----             ---------
    Total costs and expenses..........................................   6,623      34          7               6,664
                                                                        ------     ---      -----             ---------
INCOME FROM OPERATIONS................................................     564       8         (7)                565
Net interest and other financial costs................................      82       5          8  (o)             95
Minority interest in income of Marathon Ashland Petroleum LLC.........      54    --         --                    54
                                                                        ------     ---      -----             ---------
INCOME BEFORE INCOME TAXES............................................     428       3        (15)                416
Provision for estimated income taxes..................................     158       2         (6) (r)            154
                                                                        ------     ---      -----             ---------
NET INCOME............................................................     270       1         (9)                262
Dividends on preferred stock..........................................       2    --         --                     2
                                                                        ------     ---      -----             ---------
NET INCOME APPLICABLE TO COMMON STOCKS................................  $  268     $ 1      $  (9)             $  260
                                                                        ------     ---      -----             ---------
                                                                        ------     ---      -----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-13
<PAGE>
                                USX CORPORATION
 
       UNAUDITED PRO FORMA COMBINED CONSOLIDATED STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                                                 PRO FORMA
                                                                        PRO FORMA   PRO FORMA      PRO FORMA     COMBINED
                                                                           USX      TARRAGON      ADJUSTMENTS       USX
                                                                        ---------   ---------   ---------------  ---------
<S>                                                                     <C>         <C>         <C>   <C>        <C>
REVENUES:
  Sales...............................................................   $29,650      $225      $--               $29,875
  Dividend and affiliate income.......................................       110      --         --                   110
  Gain on disposal of assets..........................................        94      --         --                    94
  Other income........................................................        88      --         --                    88
                                                                        ---------   ---------   ----             ---------
    Total revenues....................................................    29,942       225       --                30,167
                                                                        ---------   ---------   ----             ---------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)..........................    21,508        51         6  (n)          21,565
  Selling, general and administrative expenses........................       697         6         3  (n)             706
  Depreciation, depletion and amortization............................     1,057        90        16  (p)           1,160
                                                                                                  (3) (q)
  Taxes other than income taxes.......................................     4,173      --         --                 4,173
  Exploration expenses................................................       189      --          21  (n)             210
  Inventory market valuation charges..................................       416      --         --                   416
                                                                        ---------   ---------   ----             ---------
    Total costs and expenses..........................................    28,040       147        43               28,230
                                                                        ---------   ---------   ----             ---------
INCOME FROM OPERATIONS................................................     1,902        78       (43)               1,937
Net interest and other financial costs................................       347        16        31  (o)             399
                                                                                                   5  (s)
Minority interest in income of Marathon Ashland Petroleum LLP.........       173      --         --                   173
                                                                        ---------   ---------   ----             ---------
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES.................     1,382        62       (79)               1,365
Provision for estimated income taxes..................................       459        24       (33) (r)             450
                                                                        ---------   ---------   ----             ---------
Income from continuing operations.....................................       923        38       (46)                 915
                                                                        ---------   ---------   ----             ---------
DISCONTINUED OPERATIONS:
Income (loss) from operations (net of income tax).....................        (1)     --         --                    (1)
Gain on disposal (net of income tax)..................................        81      --         --                    81
                                                                        ---------   ---------   ----             ---------
INCOME FROM DISCONTINUED OPERATIONS...................................        80      --         --                    80
                                                                        ---------   ---------   ----             ---------
NET INCOME............................................................     1,003        38       (46)                 995
Noncash credit from exchange of preferred stock.......................        10      --         --                    10
Dividends on preferred stock..........................................       (13)     --         --                   (13)
                                                                        ---------   ---------   ----             ---------
NET INCOME APPLICABLE TO COMMON STOCKS................................   $ 1,000      $ 38      $(46)             $   992
                                                                        ---------   ---------   ----             ---------
                                                                        ---------   ---------   ----             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-14
<PAGE>
                                USX CORPORATION
 
                 UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET
 
                            AS OF DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                     PRO FORMA      PRO FORMA
                                                                          USX       ADJUSTMENTS        USX
                                                                        -------  -----------------  ---------
<S>                                                                     <C>      <C>     <C>        <C>
ASSETS
Current assets:
  Cash and cash equivalents...........................................  $    54  $   13  (k)         $    67
  Receivables, less allowance for doubtful accounts...................    1,417     634  (k)           2,051
  Inventories.........................................................    1,685     583  (k)           2,268
  Deferred income tax benefits........................................      229    --                    229
  Other current assets................................................       87      24  (k)             111
                                                                        -------  ------             ---------
    Total current assets..............................................    3,472   1,254                4,726
 
Investments and long-term receivables, less reserves..................    1,028      67  (k)           1,095
Property, plant and equipment--net....................................   10,062   1,554  (k)          11,616
Prepaid pensions......................................................    2,247    --                  2,247
Other noncurrent assets...............................................      280      25  (k)             305
Cash restricted for redemption of Delhi Stock.........................      195    --                    195
                                                                        -------  ------             ---------
    Total assets......................................................  $17,284  $2,900              $20,184
                                                                        -------  ------             ---------
                                                                        -------  ------             ---------
LIABILITIES
Current liabilities:
  Notes payable.......................................................  $   121  $ --                $   121
  Accounts payable....................................................    2,011     793  (k)           2,804
  Payroll and benefits payable........................................      521      32  (k)             553
  Accrued taxes.......................................................      304       8  (k)             312
  Accrued interest....................................................       95    --                     95
  Long-term debt due within one year..................................      471    --                    471
                                                                        -------  ------             ---------
    Total current liabilities.........................................    3,523     833                4,356
 
Long-term debt, less unamortized discount.............................    2,932    --                  2,932
Long-term deferred income taxes.......................................    1,353       3  (k)           1,449
                                                                                     93  (l)
Employee benefits.....................................................    2,713     154  (k)           2,867
Deferred credits and other liabilities................................      736      10  (k)             746
Preferred stock of subsidiary.........................................      250    --                    250
USX obligated mandatorily redeemable convertible preferred
  securities..........................................................      182    --                    182
Minority interest in Marathon Ashland Petroleum LLC...................    --      1,654  (m)           1,654
Redeemable Delhi Stock................................................      195    --                    195
 
STOCKHOLDERS' EQUITY
Preferred stock.......................................................        3    --                      3
Common stocks.........................................................      375    --                    375
Additional paid-in capital............................................    3,924    --                  3,924
Retained earnings.....................................................    1,138     153  (l)           1,291
Other equity adjustments..............................................      (40)   --                    (40)
                                                                        -------  ------             ---------
    Total stockholders' equity........................................    5,400     153                5,553
                                                                        -------  ------             ---------
    Total liabilities and stockholders' equity........................  $17,284  $2,900              $20,184
                                                                        -------  ------             ---------
                                                                        -------  ------             ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-15
<PAGE>
                                USX CORPORATION
 
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                                      ASHLAND         PRO FORMA         PRO FORMA
                                                                            USX        RM&T          ADJUSTMENTS           USX
                                                                         ---------  -----------  --------------------  -----------
<S>                                                                      <C>        <C>          <C>        <C>        <C>
REVENUES:
  Sales................................................................  $  22,375   $   6,518   $    (369) (t)         $  29,650
                                                                                                     1,126  (u)
  Dividend and affiliate income........................................        105           5      --                        110
  Gain on disposal of assets...........................................         94      --          --                         94
  Other income.........................................................         14          74      --                         88
                                                                         ---------  -----------  ---------             -----------
    Total revenues.....................................................     22,588       6,597         757                 29,942
                                                                         ---------  -----------  ---------             -----------
 
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)...........................     16,047       4,721        (369) (t)            21,508
                                                                                                     1,126  (u)
                                                                                                       (17) (v)
  Selling, general and administrative expenses.........................        218         479      --                        697
  Depreciation, depletion and amortization.............................        967         162         (72) (w)             1,057
  Taxes other than income taxes........................................      3,178         995      --                      4,173
  Exploration expenses.................................................        189      --          --                        189
  Inventory market valuation charges...................................        284      --             132  (x)               416
                                                                         ---------  -----------  ---------             -----------
    Total costs and expenses...........................................     20,883       6,357         800                 28,040
                                                                         ---------  -----------  ---------             -----------
 
INCOME FROM OPERATIONS.................................................      1,705         240         (43)                 1,902
Net interest and other financial costs.................................        347      --          --                        347
Minority interest in income of Marathon Ashland
  Petroleum LLC........................................................     --          --             173  (y)               173
                                                                         ---------  -----------  ---------             -----------
 
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES..................      1,358         240        (216)                 1,382
Provision for estimated income taxes...................................        450      --               9  (z)               459
                                                                         ---------  -----------  ---------             -----------
INCOME FROM CONTINUING OPERATIONS......................................        908         240        (225)                   923
                                                                         ---------  -----------  ---------             -----------
DISCONTINUED OPERATIONS:
  Income (loss) from operations (net of income tax)....................         (1)     --          --                         (1)
  Gain on disposal (net of income tax).................................         81      --          --                         81
                                                                         ---------  -----------  ---------             -----------
INCOME FROM DISCONTINUED OPERATIONS....................................         80      --          --                         80
                                                                         ---------  -----------  ---------             -----------
NET INCOME.............................................................        988         240        (225)                 1,003
Noncash credit from exchange of preferred stock........................         10      --          --                         10
Dividends on preferred stock...........................................        (13)     --          --                        (13)
                                                                         ---------  -----------  ---------             -----------
NET INCOME APPLICABLE TO COMMON STOCKS.................................  $     985   $     240   $    (225)             $   1,000
                                                                         ---------  -----------  ---------             -----------
                                                                         ---------  -----------  ---------             -----------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-16
<PAGE>
                          TARRAGON OIL AND GAS LIMITED
 
                 UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET
 
                              AS OF MARCH 31, 1998
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                             PRO FORMA     PRO FORMA
                                TARRAGON    ADJUSTMENTS    TARRAGON
                                --------   -------------   ---------
<S>                             <C>        <C>             <C>
ASSETS
Current assets:
  Cash in trust...............    $  7        $--            $  7
  Receivables, less allowance
    for doubtful accounts.....      33        --               33
  Inventories.................       8        --                8
                                --------       -----       ---------
    Total current assets......      48        --               48
 
Property, plant and
  equipment--net..............     699           220(aa)      919
Other noncurrent assets.......       3        --                3
                                --------       -----       ---------
    Total assets..............    $750        $  220         $970
                                --------       -----       ---------
                                --------       -----       ---------
 
LIABILITIES
Current liabilities--accounts
  payable.....................    $ 42        $    2(aa)     $ 44
Long-term debt................     283            71(aa)      354
Long-term deferred income
  taxes.......................      71        --               71
Deferred credits and other
  liabilities.................      10        --               10
 
STOCKHOLDERS' EQUITY
Additional paid-in capital....     257           147(aa)      404
Retained earnings.............      87        --               87
                                --------       -----       ---------
    Total stockholders'
      equity..................     344           147          491
                                --------       -----       ---------
    Total liabilities and
      stockholders' equity....    $750        $  220         $970
                                --------       -----       ---------
                                --------       -----       ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-17
<PAGE>
                          TARRAGON OIL AND GAS LIMITED
 
                 UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEET
 
                            AS OF DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                           PRO FORMA     PRO FORMA
                                                              TARRAGON    ADJUSTMENTS    TARRAGON
                                                              --------   -------------   ---------
<S>                                                           <C>        <C>             <C>
ASSETS
Current assets:
  Cash in trust.............................................    $ 10        $--            $ 10
  Receivables, less allowance for doubtful accounts.........      42        --               42
  Inventories...............................................       9        --                9
                                                              --------       -----       ---------
    Total current assets....................................      61        --               61
 
Property, plant and equipment--net..........................     670           218(aa)      888
Other noncurrent assets.....................................       3        --                3
                                                              --------       -----       ---------
    Total assets............................................    $734        $  218         $952
                                                              --------       -----       ---------
                                                              --------       -----       ---------
 
LIABILITIES
Current liabilities--accounts payable.......................    $ 38        $    3(aa)     $ 41
Long-term debt..............................................     276            70(aa)      346
Long-term deferred income taxes.............................      70        --               70
Deferred credits and other liabilities......................       9        --                9
 
STOCKHOLDERS' EQUITY
Additional paid-in capital..................................     255           145(aa)      400
Retained earnings...........................................      86        --               86
                                                              --------       -----       ---------
    Total stockholders' equity..............................     341           145          486
                                                              --------       -----       ---------
    Total liabilities and stockholders' equity..............    $734        $  218         $952
                                                              --------       -----       ---------
                                                              --------       -----       ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-18
<PAGE>
                          TARRAGON OIL AND GAS LIMITED
 
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
 
                       THREE MONTHS ENDED MARCH 31, 1998
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                         UNOCAL    PRO FORMA    PRO FORMA
                                                              TARRAGON   CANADA   ADJUSTMENTS   TARRAGON
                                                              --------   ------   -----------   ---------
<S>                                                           <C>        <C>      <C>           <C>
REVENUES....................................................   $  29     $  13       $--          $  42
                                                              --------   ------   -----------   ---------
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)................       8         3       --              11
  Selling, general and administrative expenses..............       1      --         --               1
  Depreciation, depletion and amortization..................      15      --             7(bb)       22
                                                              --------   ------   -----------   ---------
    Total costs and expenses................................      24         3           7           34
                                                              --------   ------   -----------   ---------
INCOME FROM OPERATIONS......................................       5        10          (7)           8
Net interest and other financial costs......................       4      --             1(cc)        5
                                                              --------   ------   -----------   ---------
INCOME BEFORE INCOME TAXES..................................       1        10          (8)           3
Provision for estimated income taxes........................       1      --             1(dd)        2
                                                              --------   ------   -----------   ---------
NET INCOME..................................................   $--       $  10       $  (9)       $   1
                                                              --------   ------   -----------   ---------
                                                              --------   ------   -----------   ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-19
<PAGE>
                          TARRAGON OIL AND GAS LIMITED
 
            UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS
 
                          YEAR ENDED DECEMBER 31, 1997
 
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                                                         UNOCAL    PRO FORMA    PRO FORMA
                                                              TARRAGON   CANADA   ADJUSTMENTS   TARRAGON
                                                              --------   ------   -----------   ---------
<S>                                                           <C>        <C>      <C>           <C>
REVENUES....................................................    $154      $ 71       $--          $225
                                                              --------   ------      -----      ---------
 
COSTS AND EXPENSES:
  Cost of sales (excludes items shown below)................      35        16       --             51
  Selling, general and administrative expenses..............       5      --             1(ff)       6
  Depreciation, depletion and amortization..................      63      --            25(bb)      90
                                                                                         2(bb)
                                                              --------   ------      -----      ---------
    Total costs and expenses................................     103        16          28         147
                                                              --------   ------      -----      ---------
INCOME FROM OPERATIONS......................................      51        55         (28)         78
Net interest and other financial costs......................      12      --             4(cc)      16
                                                              --------   ------      -----      ---------
INCOME BEFORE INCOME TAXES..................................      39        55         (32)         62
Provision for estimated income taxes........................      15      --             8(dd)      24
                                                                                         1(ee)
                                                              --------   ------      -----      ---------
NET INCOME..................................................    $ 24      $ 55       $ (41)       $ 38
                                                              --------   ------      -----      ---------
                                                              --------   ------      -----      ---------
</TABLE>
 
      SEE ACCOMPANYING NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS.
 
                                      M-20
<PAGE>
                          NOTES TO UNAUDITED PRO FORMA
                              FINANCIAL STATEMENTS
 
                      MARCH 31, 1998 AND DECEMBER 31, 1997
 
NOTE 1. BASIS OF PRESENTATION
 
    DESCRIPTION OF THE TRANSACTION.  In accordance with the Arrangement
Agreement, each Tarragon Securityholder will ultimately receive, at the option
of such holder, cash in the amount of C$14.25 per share or a number of
Exchangeable Shares equal to the quotient of C$14.25 divided by the Average
Closing Price per share of the Marathon Stock multiplied by the number of
Tarragon Securities tendered. The Exchangeable Shares entitle the holders to
declared dividends and other rights economically equivalent to those of holders
of Marathon Stock. The Exchangeable Shares will represent ownership in an
indirect wholly owned Canadian subsidiary of Marathon and will be exchangeable
only into Marathon Stock on a one-for-one basis. As set forth in the Arrangement
Agreement, at least 10 percent of the total consideration is required to be in
cash.
 
    The exact amount of cash or Exchangeable Shares to be elected in the
Tarragon acquisition cannot be determined at this time. For purposes of the
unaudited pro forma financial statements, it was assumed that holders of 65
percent of Tarragon shares and special warrants received cash and 35 percent
received Exchangeable Shares. If it is assumed that all holders of Tarragon
shares elect to receive cash, or if it is assumed that 90 percent of the holders
of Tarragon shares elect to receive Exchangeable Shares, net income per share
(basic and diluted) would not change by more than one cent per share from the
amounts presented for both periods in the unaudited pro forma combined financial
statements.
 
    DESCRIPTION OF PRO FORMA FINANCIAL STATEMENTS.  The unaudited pro forma
combined financial statements of the Marathon Group (pages M-5 through M-8) and
USX (pages M-11 through M-14) have been prepared assuming the Tarragon
acquisition is accounted for as a purchase of Tarragon by Marathon under U.S.
GAAP. USX follows the successful efforts method of accounting for oil and gas
exploration and development. Tarragon follows the full cost method of accounting
for exploration and development. Pro forma adjustments to conform the unaudited
pro forma consolidated financial statements of Tarragon to the successful
efforts method, as well as pro forma adjustments to conform Tarragon's unaudited
pro forma consolidated financial statements from Canadian GAAP to U.S. GAAP, are
presented in the unaudited pro forma combined financial statements of USX and
the Marathon Group. Additionally, under U.S. GAAP, the functional currency for
Tarragon has been assumed to be the U.S. dollar for financial statement
reporting purposes.
 
    The unaudited pro forma financial statements of the Marathon Group (pages
M-9 and M-10) and USX (pages M-15 and M-16) for the periods presented have been
prepared by USX to give effect to the acquisition of Ashland RM&T, as described
below.
 
    The unaudited pro forma consolidated financial statements of Tarragon (pages
M-17 through M-20) for the periods presented have been prepared by Tarragon to
give effect to the acquisition of Unocal Canada as described below. The
historical consolidated financial statements of Tarragon, which are incorporated
by reference in this Information Circular, were prepared under Canadian GAAP and
in Canadian dollars. In the unaudited pro forma consolidated financial
statements of Tarragon, the historical consolidated financial statements of
Tarragon have been converted to U.S. dollars using the period end exchange rate
for the balance sheets and the average exchange rate for the statements of
operations for the respective periods. In addition, certain reclassifications
have been made to the historical consolidated financial statements of Tarragon
to conform with USX's financial statement presentation.
 
    The unaudited pro forma combined balance sheets of USX and the Marathon
Group as of March 31, 1998 and December 31, 1997 have been prepared to give
effect to the Tarragon acquisition as if such transaction occurred on those
respective dates. The unaudited pro forma combined statements of operations of
USX and the Marathon Group for the three months ended March 31, 1998 and the
year ended December 31, 1997 have been prepared to give effect to the Tarragon
acquisition as if such transaction occurred at the beginning of the periods
presented.
 
                                      M-21
<PAGE>
                          NOTES TO UNAUDITED PRO FORMA
                        FINANCIAL STATEMENTS (CONTINUED)
 
                      MARCH 31, 1998 AND DECEMBER 31, 1997
 
NOTE 1. BASIS OF PRESENTATION (CONTINUED)
    The unaudited pro forma balance sheets of USX and the Marathon Group as of
December 31, 1997 have been prepared to give effect to the Ashland RM&T
acquisition as if such transaction occurred on that date. The unaudited pro
forma statements of operations of USX and the Marathon Group for the year ended
December 31, 1997 have been prepared to give effect to the Ashland RM&T
acquisition as if such transaction occurred at the beginning of the period.
 
    The unaudited pro forma consolidated balance sheets of Tarragon as of March
31, 1998 and December 31, 1997 have been prepared to give effect to the Unocal
Canada acquisition as if such transaction occurred on those respective dates.
The unaudited pro forma consolidated statements of operations of Tarragon for
the three months ended March 31, 1998 and the year ended December 31, 1997 have
been prepared to give effect to the Unocal Canada acquisition as if such
transaction occurred at the beginning of the periods presented.
 
    The following is a description of the individual columns included in the
unaudited pro forma financial statements:
 
        USX--Represents the consolidated balance sheets of USX as of March 31,
    1998 and December 31, 1997 and the consolidated statements of operations of
    USX for the three months ended March 31, 1998 and for the year ended
    December 31, 1997.
 
        MARATHON GROUP--Represents the balance sheets of the Marathon Group as
    of March 31, 1998 and December 31, 1997 and the statements of operations of
    the Marathon Group for the three months ended March 31, 1998 and for the
    year ended December 31, 1997.
 
        PRO FORMA USX AND PRO FORMA MARATHON GROUP--Represents the balance
    sheets and statements of operations of USX and the Marathon Group on a pro
    forma basis solely to give effect to the acquisition of Ashland RM&T, as
    defined below.
 
        ASHLAND RM&T--Represents the results of operations of the refining,
    marketing and transportation businesses of Ashland Inc. (Ashland RM&T) for
    the year ended December 31, 1997, on a historical basis. On January 1, 1998,
    Marathon transferred certain refining, marketing and transportation net
    assets to a new consolidated subsidiary, which was named Marathon Ashland
    Petroleum LLC (MAP). Also on January 1, 1998, Marathon acquired the Ashland
    RM&T net assets in exchange for a 38% interest in MAP. The acquisition was
    accounted for as a purchase.
 
        TARRAGON--Represents the consolidated balance sheets of Tarragon as of
    March 31, 1998 and December 31, 1997 and the consolidated statements of
    operations of Tarragon for the three months ended March 31, 1998 and for the
    year ended December 31, 1997 prepared under Canadian GAAP and converted to
    U.S. dollars utilizing the exchange rates of Canadian dollars to U.S.
    dollars as listed below:
 
<TABLE>
<CAPTION>
                                                                                  MARCH 31,    DECEMBER 31,
                                                                                    1998           1997
                                                                                 -----------  ---------------
<S>                                                                              <C>          <C>
Balance Sheets.................................................................   $    .706      $    .700
Statements of Operations.......................................................        .700           .720
</TABLE>
 
        PRO FORMA TARRAGON--Represents the balance sheets and statements of
    operations for Tarragon on a pro forma basis solely to give effect to the
    acquisition of Unocal Canada, as defined below.
 
        UNOCAL CANADA--Represents revenues and production expenses from certain
    assets of Unocal Canada Limited, Unocal Canada Resources and Unocal Canada
    Exploration Limited (Unocal Canada) for the three months ended March 31,
    1998 and the year ended December 31, 1997, which were prepared under
 
                                      M-22
<PAGE>
                          NOTES TO UNAUDITED PRO FORMA
                        FINANCIAL STATEMENTS (CONTINUED)
 
                      MARCH 31, 1998 AND DECEMBER 31, 1997
 
NOTE 1. BASIS OF PRESENTATION (CONTINUED)
    Canadian GAAP and converted to U.S. dollars utilizing the above exchange
    rates. On April 15, 1998, Tarragon acquired the Unocal Canada assets.
 
NOTE 2. ACQUISITION OF TARRAGON
 
    The following table represents the pro forma allocation of the total
purchase price to the acquired assets and liabilities of Tarragon. The
allocation represents the fair values assigned to the assets acquired and
liabilities assumed using the purchase method of accounting. The actual
allocation of the purchase price is not anticipated to be materially different
from the table presented below:
 
<TABLE>
<CAPTION>
                                                                                       MARCH 31,   DECEMBER 31,
                                                                                         1998          1997
                                                                                      -----------  -------------
                                                                                            (IN MILLIONS)
<S>                                                                                   <C>          <C>
Net working capital.................................................................   $     (10)    $       3
Property, plant and equipment.......................................................       1,178(1)       1,146(1)
Other noncurrent assets.............................................................           7            10
Long-term debt......................................................................        (354)         (346)
Deferred income tax liabilities.....................................................         (54)          (53)
Other noncurrent liabilities........................................................          (5)           (4)
                                                                                      -----------       ------
    Total allocated purchase price..................................................   $     762     $     756
                                                                                      -----------       ------
                                                                                      -----------       ------
Consideration for Tarragon shares and special warrants..............................   $     736(2)   $     730(2)
Consideration for Tarragon options..................................................          14            14
Transaction costs...................................................................          12            12
                                                                                      -----------       ------
    Total consideration paid........................................................   $     762     $     756
                                                                                      -----------       ------
                                                                                      -----------       ------
</TABLE>
 
    NOTES:
 
    (1) Includes unproved properties investment of approximately $110 million.
 
    (2) Represents the tendering of 73,156,896 Tarragon shares and special
       warrants (the amount outstanding or issuable at May 29, 1998) at C$14.25
       per share for cash totalling C$678 million and the issuance of
       Exchangeable Shares totalling 7,358,907 shares and 7,294,273 shares at
       March 31, 1998 and December 31, 1997, respectively. The ratio of
       Exchangeable Shares for each tendered Tarragon share is based on an
       assumed Average Closing Price of $35.00 per share of Marathon Stock
       translated into Canadian dollars at the respective balance sheet currency
       exchange rate disclosed in Note 1.
 
NOTE 3. PRO FORMA ENTRIES
 
    USX AND MARATHON GROUP PRO FORMA ADJUSTMENTS GIVING EFFECT TO THE TARRAGON
(ENTRIES A THROUGH J) AND ASHLAND RM&T (ENTRIES K THROUGH M) ACQUISITIONS IN THE
UNAUDITED PRO FORMA BALANCE SHEETS REFLECT THE FOLLOWING:
 
    (a) To reclassify cash held in trust relating to future fixed asset
       expenditures from current to long-term assets in accordance with U.S.
       GAAP.
 
    (b) To reverse unrealized foreign currency exchange losses on U.S. dollar
       debt that is deferred for Canadian GAAP purposes.
 
    (c) To record the fair value of forward currency exchange contracts in
       accordance with U.S. GAAP.
 
    (d) To record the excess of fair value over recorded cost of the acquired
       long-lived assets, primarily reserves and unproved properties.
 
                                      M-23
<PAGE>
                          NOTES TO UNAUDITED PRO FORMA
                        FINANCIAL STATEMENTS (CONTINUED)
 
                      MARCH 31, 1998 AND DECEMBER 31, 1997
 
NOTE 3. PRO FORMA ENTRIES (CONTINUED)
    (e) To record deferred Canadian income taxes based on the temporary
       differences between tax basis and financial book basis of assets and
       liabilities at the Canadian statutory rate.
 
    (f) To record a deferred U.S. income tax benefit expected to be realized by
       crediting future Canadian income tax payments against future U.S. income
       tax liabilities at the U.S. statutory rate.
 
    (g) To eliminate the historical stockholders' equity of Tarragon.
 
    (h) To adjust accrued site restoration costs to conform to Marathon's
       accounting policy.
 
    (i) Represents anticipated borrowings to finance the assumed cash portion of
       the acquisition.
 
    (j) Represents anticipated issuance of Exchangeable Shares for the assumed
       equity portion of the acquisition.
 
    (k) To record the acquisition of certain refining, marketing and
       transportation net assets from Ashland Inc. in exchange for a 38%
       ownership interest in MAP. The acquisition was accounted for under the
       purchase method of accounting. The purchase price of $1.9 billion was
       allocated to the acquired assets and liabilities based on fair value.
 
    (l) Represents adjustments to reflect a gain resulting from the change in
       Marathon's ownership interest in MAP.
 
    (m) Represents the minority interest in MAP.
 
    USX AND MARATHON GROUP PRO FORMA ADJUSTMENTS GIVING EFFECT TO THE TARRAGON
(ENTRIES N THROUGH S) AND ASHLAND RM&T (ENTRIES T THROUGH Z) ACQUISITIONS IN THE
UNAUDITED PRO FORMA STATEMENTS OF OPERATIONS REFLECT THE FOLLOWING:
 
    (n) To recognize as expense, in accordance with the successful efforts
       method of accounting, amounts which were capitalized by Tarragon under
       the full cost method of accounting.
 
    (o) To record interest expense on the assumed incremental U.S. dollar
       borrowings used to finance a portion of the acquisition and transaction
       costs. The interest expense was determined by using interest rates of
       6.0% and 6.2% which represent USX's estimated incremental borrowing rate
       for the three months ended March 31, 1998 and the year ended December 31,
       1997, respectively.
 
    (p) To adjust depreciation, depletion and amortization of capitalized costs
       allocated to oil and gas properties.
 
    (q) To adjust site restoration costs to conform to Marathon's accounting
       policy.
 
    (r) To record the income tax effect of pro forma adjustments at the
       applicable statutory rate.
 
    (s) To record foreign currency remeasurement gains and losses in accordance
       with U.S. GAAP.
 
    (t) To record intercompany eliminations for crude oil and refined product
       buy/sell transactions.
 
    (u) To record Ashland RM&T crude oil and refined product buy/sell
       transactions to conform to Marathon's accounting policy.
 
    (v) To adjust cost of sales for operating lease expense recorded by Ashland
       RM&T and to recognize additional environmental costs.
 
    (w) To adjust depreciation resulting from the effect of purchase price
       allocations for property, plant and equipment of Ashland RM&T.
 
                                      M-24
<PAGE>
                          NOTES TO UNAUDITED PRO FORMA
                        FINANCIAL STATEMENTS (CONTINUED)
 
                      MARCH 31, 1998 AND DECEMBER 31, 1997
 
NOTE 3. PRO FORMA ENTRIES (CONTINUED)
    (x) To adjust Ashland RM&T inventory value to market.
 
    (y) To reflect minority interest in income of MAP.
 
    (z) To record the income tax effect resulting from the inclusion of Ashland
       RM&T operations, on a pro forma basis, at the statutory rate.
 
    TARRAGON PRO FORMA ADJUSTMENTS GIVING EFFECT TO THE UNOCAL ACQUISITION IN
THE UNAUDITED PRO FORMA CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS
REFLECT THE FOLLOWING:
 
   (aa) The pro forma adjustments reflect the completion of the transaction
        under which Tarragon issued 21 million common shares and a C$100 million
        subordinated debenture to Unocal Canada. The Tarragon common shares
        issued have been valued at an ascribed price of C$9.90 per common share.
        Other transaction costs have been estimated to be C$3.5 million at March
        31, 1998 and December 31, 1997.
 
   (bb) To record an increase to depletion, depreciation, amortization and site
        restoration resulting from a higher cost base upon consolidation.
 
   (cc) To record an increase in interest expense due to the issuance of the
        subordinated debenture which bears interest at 1.50% over the three-year
        Government of Canada Treasury Bond rate. There was also a reduction in
        interest expense assuming the cash flow from the Unocal Canada
        properties was used to reduce debt.
 
   (dd) To record an increase to deferred taxes resulting from the inclusion of
        the operations of Unocal Canada.
 
   (ee) To record an increase to Large Corporation Tax resulting from an
        increase in capitalization.
 
    (ff) To record an increase in general and administrative expenses due to the
         addition of certain Unocal Canada staff.
 
                                      M-25


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