Exhibit 99.2

               Marathon Group



               Index to 1999 Financial Statements and Supplementary Data



                                                                           Page
                                                                           ----
                                                                        
               Management's Report.......................................  M-1

               Audited Financial Statements:

                 Report of Independent Accountants.......................  M-1

                 Statement of Operations.................................  M-2

                 Balance Sheet...........................................  M-3

                 Statement of Cash Flows.................................  M-4

                 Notes to Financial Statements...........................  M-5

               Selected Quarterly Financial Data.........................  M-21

               Principal Unconsolidated Affiliates.......................  M-21

               Supplementary Information.................................  M-21



               Marathon Group


               Explanatory Note Regarding Financial Information


               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 does not
               affect legal title to such assets and responsibility for such
               liabilities. Holders of USX - Marathon Group Common Stock and
               USX -U. S. Steel Group Common 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 or
               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, will reduce the funds of USX
               legally available for payment of dividends on both classes of USX
               Common Stock. Accordingly, the USX consolidated financial
               information should be read in connection with the Marathon Group
               financial information.


             Management's Report

             The accompanying financial statements of the Marathon Group are the
             responsibility of and have been prepared by USX Corporation (USX)
             in conformity with accounting principles generally accepted in the
             United States. They necessarily include some amounts that are based
             on best judgments and estimates. The Marathon Group financial
             information displayed in other sections of this report is
             consistent with these financial statements.

                 USX seeks to assure the objectivity and integrity of its
             financial records by careful selection of its managers, by
             organizational arrangements that provide an appropriate division of
             responsibility and by communications programs aimed at assuring
             that its policies and methods are understood throughout the
             organization.

                 USX has a comprehensive formalized system of internal
             accounting controls designed to provide reasonable assurance that
             assets are safeguarded and that financial records are reliable.
             Appropriate management monitors the system for compliance, and the
             internal auditors independently measure its effectiveness and
             recommend possible improvements thereto. In addition, as part of
             their audit of the financial statements, USX's independent
             accountants, who are elected by the stockholders, review and test
             the internal accounting controls selectively to establish a basis
             of reliance thereon in determining the nature, extent and timing of
             audit tests to be applied.

                 The Board of Directors pursues its oversight role in the area
             of financial reporting and internal accounting control through its
             Audit Committee. This Committee, composed solely of nonmanagement
             directors, regularly meets (jointly and separately) with the
             independent accountants, management and internal auditors to
             monitor the proper discharge by each of its responsibilities
             relative to internal accounting controls and the consolidated and
             group financial statements.


                                                                    
             Thomas J. Usher                 Robert M. Hernandez          Kenneth L. Matheny
             Chairman, Board of Directors    Vice Chairman                Vice President
             & Chief Executive Officer       & Chief Financial Officer    & Comptroller


             Report of Independent Accountants

             To the Stockholders of USX Corporation:

             In our opinion, the accompanying financial statements appearing on
             pages M-2 through M-20 present fairly, in all material respects,
             the financial position of the Marathon Group at December 31, 1999
             and 1998, and the results of its operations and its cash flows for
             each of the three years in the period ended December 31, 1999, in
             conformity with accounting principles generally accepted in the
             United States. These financial statements are the responsibility of
             USX's management; our responsibility is to express an opinion on
             these financial statements based on our audits. We conducted our
             audits of these statements in accordance with auditing standards
             generally accepted in the United States, which require that we plan
             and perform the audit to obtain reasonable assurance about whether
             the financial statements are free of material misstatement. An
             audit includes examining, on a test basis, evidence supporting the
             amounts and disclosures in the financial statements, assessing the
             accounting principles used and significant estimates made by
             management, and evaluating the overall financial statement
             presentation. We believe that our audits provide a reasonable basis
             for the opinion expressed above.

                 The Marathon Group is a business unit of USX Corporation (as
             described in Note 1, page M-5); accordingly, the financial
             statements of the Marathon Group should be read in connection with
             the consolidated financial statements of USX Corporation.


             PricewaterhouseCoopers LLP
             600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
             February 8, 2000

                                                                             M-1


             Statement of Operations



             (Dollars in millions)                                        1999      1998     1997
             -------------------------------------------------------------------------------------
                                                                                  
             Revenues:
              Sales (Note 7)                                            $24,212   $21,628  $15,760
              Dividend and affiliate income                                  69        50       36
              Net gains on disposal of assets                                 -        28       37
              Gain on ownership change in
               Marathon Ashland Petroleum LLC (Note 5)                       17       245        -
              Other income                                                   29        26       13
                                                                        -------   -------  -------
                 Total revenues                                          24,327    21,977   15,846
                                                                        -------   -------  -------
             Costs and expenses:
              Cost of sales (excludes items shown below)                 17,273    14,984   10,392
              Selling, general and administrative expenses                  486       505      355
              Depreciation, depletion and amortization                      950       941      664
              Taxes other than income taxes                               4,218     4,029    3,030
              Exploration expenses                                          238       313      189
              Inventory market valuation charges (credits) (Note 20)       (551)      267      284
                                                                        -------   -------  -------
                 Total costs and expenses                                22,614    21,039   14,914
                                                                        -------   -------  -------
             Income from operations                                       1,713       938      932
             Net interest and other financial costs (Note 8)                288       237      260
             Minority interest in income of
              Marathon Ashland Petroleum LLC (Note 5)                       447       249        -
                                                                        -------   -------  -------
             Income before income taxes                                     978       452      672
             Provision for estimated income taxes (Note 18)                 324       142      216
                                                                        -------   -------  -------
             Net income                                                 $   654   $   310  $   456
             -------------------------------------------------------------------------------------


             Income Per Common Share
                                                                           1999      1998     1997
             -------------------------------------------------------------------------------------
             Basic                                                      $  2.11   $  1.06  $  1.59
             Diluted                                                       2.11      1.05     1.58
             -------------------------------------------------------------------------------------


             See Note 22, for a description and computation of income per common
             share.
             The accompanying notes are an integral part of these financial
             statements.

M-2


Balance Sheet




             (Dollars in millions)                                           December 31        1999         1998
             ------------------------------------------------------------------------------------------------------
                                                                                                     
             Assets

             Current assets:
              Cash and cash equivalents (Note 6)                                              $   111      $   137
              Receivables, less allowance for doubtful accounts
               of $2 and $3                                                                     1,866        1,277
              Inventories (Note 20)                                                             1,884        1,310
              Other current assets                                                                241          252
                                                                                              -------      -------
                 Total current assets                                                           4,102        2,976

             Investments and long-term receivables (Note 19)                                      772          603
             Property, plant and equipment - net (Note 16)                                     10,293       10,429
             Prepaid pensions (Note 14)                                                           225          241
             Other noncurrent assets                                                              313          295
                                                                                              -------      -------
                 Total assets                                                                 $15,705      $14,544
             ------------------------------------------------------------------------------------------------------
             Liabilities

             Current liabilities:
              Notes payable                                                                   $     -      $   132
              Accounts payable                                                                  2,659        1,940
              Income taxes payable (Note 23)                                                       97            -
              Distribution payable to minority shareholder of
               Marathon Ashland Petroleum LLC (Note 6)                                              -          103
              Payroll and benefits payable                                                        146          190
              Accrued taxes                                                                       107           99
              Accrued interest                                                                     92           87
              Long-term debt due within one year (Note 12)                                         48           59
                                                                                              -------      -------
                 Total current liabilities                                                      3,149        2,610

             Long-term debt (Note 12)                                                           3,320        3,456
             Deferred income taxes (Note 18)                                                    1,495        1,450
             Employee benefits (Note 14)                                                          564          553
             Deferred credits and other liabilities (Note 23)                                     440          389
             Preferred stock of subsidiary (Note 9)                                               184          184

             Minority interest in Marathon Ashland Petroleum LLC (Note 5)                       1,753        1,590

             Common Stockholders' Equity (Note 17)                                              4,800        4,312
                                                                                              -------      -------

                 Total liabilities and common stockholders' equity                            $15,705      $14,544
             -----------------------------------------------------------------------------------------------------

             The accompanying notes are an integral part of these financial
             statements.

                                                                             M-3


Statement of Cash Flows



             (Dollars in millions)                                                                  1999         1998         1997
             ----------------------------------------------------------------------------------------------------------------------
                                                                                                                  
             Increase (decrease) in cash and cash equivalents
             Operating activities:
             Net income                                                                          $   654      $   310      $   456
             Adjustments to reconcile to net cash
              provided from operating activities:
               Minority interest in income of
                Marathon Ashland Petroleum LLC                                                       447          249            -
               Depreciation, depletion and amortization                                              950          941          664
               Exploratory dry well costs                                                            109          186           78
               Inventory market valuation charges (credits)                                         (551)         267          284
               Pensions and other postretirement benefits                                             36           34            6
               Deferred income taxes                                                                 105           26           30
               Gain on ownership change in
                Marathon Ashland Petroleum LLC                                                       (17)        (245)           -
               Net gains on disposal of assets                                                         -          (28)         (37)
               Changes in: Current receivables - sold                                                  -            -         (340)
                                               - operating turnover                                 (833)         240           97
                       Inventories                                                                   (63)         (13)          18
                       Current accounts payable and accrued expenses                               1,095         (233)          11
               All other - net                                                                        84          (92)         (21)
                                                                                                 -------      -------      -------
                 Net cash provided from operating activities                                       2,016        1,642        1,246
                                                                                                 -------      -------      -------
             Investing activities:
             Capital expenditures                                                                 (1,378)      (1,270)      (1,038)
             Acquisition of Tarragon Oil and Gas Limited                                               -         (686)           -
             Disposal of assets                                                                      356           65           60
             Restricted cash - withdrawals                                                            45           11          108
                             - deposits                                                              (44)         (32)         (10)
             Affiliates - investments                                                                (59)         (42)        (193)
                        - loans and advances                                                         (70)        (103)         (46)
                        - returns and repayments                                                       1           71            8
             All other - net                                                                         (25)         (18)          (2)
                                                                                                 -------      -------      -------
                 Net cash used in investing activities                                            (1,174)      (2,004)      (1,113)
                                                                                                 -------      -------      -------
             Financing activities (Note 9):
             Increase (decrease) in Marathon Group's
              portion of USX consolidated debt                                                      (296)         329           97
             Specifically attributed debt:
              Borrowings                                                                             141          366            -
              Repayments                                                                            (144)        (389)         (39)
             Marathon Stock issued                                                                    89          613           34
             Dividends paid                                                                         (257)        (246)        (219)
             Distributions to minority shareholder of
              Marathon Ashland Petroleum LLC                                                        (400)        (211)           -
                                                                                                 -------      -------      -------
                 Net cash provided from (used in) financing activities                              (867)         462         (127)
                                                                                                 -------      -------      -------
             Effect of exchange rate changes on cash                                                  (1)           1           (2)
                                                                                                 -------      -------      -------
             Net increase (decrease) in cash and cash equivalents                                    (26)         101            4

             Cash and cash equivalents at beginning of year                                          137           36           32
                                                                                                 -------      -------      -------
             Cash and cash equivalents at end of year                                            $   111      $   137      $    36
             ----------------------------------------------------------------------------------------------------------------------

             See Note 13, for supplemental cash flow information.

             The accompanying notes are an integral part of these financial
             statements.

M-4


               Notes to Financial Statements

1.   Basis of Presentation

               After the redemption of the USX - Delhi Group stock on January
               26, 1998, USX Corporation (USX) has two classes of common stock:
               USX - Marathon Group Common Stock (Marathon Stock) and USX -
               U. S. Steel Group Common Stock (Steel Stock), which are intended
               to reflect the performance of the Marathon Group and the U. S.
               Steel Group, respectively.

                    The financial statements of the Marathon Group include the
               financial position, results of operations and cash flows 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. For a
               description of the Marathon Group's operating segments, see Note
               10.

                    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 between 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.

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

2.   Summary of Principal Accounting Policies

               Principles applied in consolidation - These financial statements
               include the accounts of the businesses comprising the Marathon
               Group. The Marathon Group and the U. S. Steel Group financial
               statements, taken together, comprise all of the accounts included
               in the USX consolidated financial statements.

                    Investments in unincorporated oil and gas joint ventures,
               undivided interest pipelines and jointly owned gas processing
               plants are consolidated on a pro rata basis.

                    Investments in entities over which the Marathon Group has
               significant influence are accounted for using the equity method
               of accounting and are carried at the Marathon Group's share of
               net assets plus loans and advances.

                    Investments in companies whose stock is publicly traded are
               carried at market value. The difference between the cost of these
               investments and market value is recorded in other comprehensive
               income (net of tax). Investments in companies whose stock has no
               readily determinable fair value are carried at cost.

               Use of estimates - Generally accepted accounting principles
               require management to make estimates and assumptions that affect
               the reported amounts of assets and liabilities, the disclosure of
               contingent assets and liabilities at year-end and the reported
               amounts of revenues and expenses during the year. Significant
               items subject to such estimates and assumptions include the
               carrying value of long-lived assets; valuation allowances for
               receivables, inventories and deferred income tax assets;
               environmental liabilities; liabilities for potential tax
               deficiencies and potential litigation claims and settlements; and
               assets and obligations related to employee benefits.
               Additionally, certain estimated liabilities are recorded when
               management commits to a plan to close an operating facility or to
               exit a business activity. Actual results could differ from the
               estimates and assumptions used.

                                                                             M-5


               Revenue recognition - Revenues principally include sales,
               dividend and affiliate income, gains or losses on the disposal of
               assets and gains or losses from changes in ownership interests.

                    Sales - Sales are recognized when products are shipped or
                    services are provided to customers. Consumer excise taxes on
                    petroleum products and merchandise and matching crude oil
                    and refined products buy/sell transactions settled in cash
                    are included in both revenues and costs and expenses, with
                    no effect on income.

                    Dividend and Affiliate Income - Dividend and affiliate
                    income includes the Marathon Group's proportionate share of
                    income from equity method investments and dividend income
                    from other investments. Dividend income is recognized when
                    dividend payments are received.

                    Disposal of Assets - When long-lived assets depreciated on
                    an individual basis are sold or otherwise disposed of, any
                    gains or losses are reflected in income. Gains on disposal
                    of long-lived assets are recognized when earned, which is
                    generally at the time of closing. If a loss on disposal is
                    expected, such losses are recognized when long-lived assets
                    are reclassified as assets held for sale. Proceeds from
                    disposal of long-lived assets depreciated on a group basis
                    are credited to accumulated depreciation, depletion and
                    amortization with no immediate effect on income.

                    Gas Balancing - The Marathon Group follows the sales method
                    of accounting for gas production imbalances and would
                    recognize a liability if the existing proved reserves were
                    not adequate to cover the current imbalance situation.

                    Change in Ownership Interest - Gains or losses from a change
                    in ownership of a consolidated subsidiary or an
                    unconsolidated affiliate are recognized in revenues in the
                    period of change.

               Cash and cash equivalents - Cash and cash equivalents include
               cash on hand and on deposit and investments in highly liquid debt
               instruments with maturities generally of three months or less.

               Inventories - Inventories are carried at lower of cost or market.
               Cost of inventories is determined primarily under the last-in,
               first-out (LIFO) method.

               Derivative instruments - The Marathon Group uses commodity-based
               and foreign currency derivative instruments to manage its
               exposure to price risk. Management is authorized to use futures,
               forwards, swaps and options related to the purchase, production
               or sale of crude oil, natural gas, refined products and
               electricity. While the Marathon Group's risk management
               activities generally reduce market risk exposure due to
               unfavorable commodity price changes for raw material purchases
               and products sold, such activities can also encompass strategies
               which assume price risk.

                    Commodity-Based Hedging Transactions - For transactions that
                    qualify for hedge accounting, the resulting gains or losses
                    are deferred and subsequently recognized in income from
                    operations, as a component of sales or cost of sales, in the
                    same period as the underlying physical transaction. To
                    qualify for hedge accounting, derivative positions cannot
                    remain open if the underlying physical market risk has been
                    removed. If such derivative positions remain in place, they
                    would be marked-to-market and accounted for as trading or
                    other activities. Recorded deferred gains or losses are
                    reflected within other current and noncurrent assets or
                    accounts payable and deferred credits and other liabilities,
                    as appropriate.

                    Commodity-Based Trading and Other Activities - Derivative
                    instruments used for trading and other activities are
                    marked-to-market and the resulting gains or losses are
                    recognized in the current period within income from
                    operations. This category also includes the use of
                    derivative instruments that have no offsetting underlying
                    physical market risk.

                    Foreign Currency Transactions - The Marathon Group uses
                    forward exchange contracts to manage currency risks. Gains
                    or losses related to firm commitments are deferred and
                    recognized concurrent with the underlying transaction. All
                    other gains or losses are recognized in income in the
                    current period as sales, cost of sales, interest income or
                    expense, or other income, as appropriate. Forward exchange
                    contracts are recorded as receivables or payables, as
                    appropriate.

               Exploration and development - The Marathon Group follows the
               successful efforts method of accounting for oil and gas
               exploration and development.
M-6


               Long-lived assets - Depreciation and depletion of oil and gas
               producing properties are computed using predetermined rates based
               upon estimated proved oil and gas reserves applied on a units-of-
               production method. Other items of property, plant and equipment
               are depreciated principally by the straight-line method.

                    The Marathon Group evaluates impairment of its oil and gas
               producing assets primarily on a field-by-field basis using
               undiscounted cash flows based on total proved reserves. Other
               assets are evaluated on an individual asset basis or by logical
               groupings of assets. Assets deemed to be impaired are written
               down to their fair value, including any related goodwill, using
               discounted future cash flows and, if available, comparable market
               values.

               Environmental liabilities - The Marathon Group provides for
               remediation costs and penalties when the responsibility to
               remediate is probable and the amount of associated costs is
               reasonably determinable. Generally, the timing of remediation
               accruals coincides with completion of a feasibility study or the
               commitment to a formal plan of action. Remediation liabilities
               are accrued based on estimates of known environmental exposure
               and are discounted in certain instances. If recoveries of
               remediation costs from third parties are probable, a receivable
               is recorded. Estimated abandonment and dismantlement costs of
               offshore production platforms are accrued based upon estimated
               proved oil and gas reserves on a units-of-production method.

               Insurance - The Marathon Group is insured for catastrophic
               casualty and certain property and business interruption
               exposures, as well as those risks required to be insured by law
               or contract. Costs resulting from noninsured losses are charged
               against income upon occurrence.

               Reclassifications - Certain reclassifications of prior years'
               data have been made to conform to 1999 classifications.

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

3.   New Accounting Standards

               Effective January 1, 1997, USX adopted American Institute of
               Certified Public Accountants Statement of Position No. 96-1,
               "Environmental Remediation Liabilities" (SOP 96-1), which
               provides additional interpretation of existing accounting
               standards related to recognition, measurement and disclosure of
               environmental remediation liabilities. As a result of adopting
               SOP 96-1, the Marathon Group identified additional environmental
               remediation liabilities of $11 million. Estimated receivables for
               recoverable costs related to adoption of SOP 96-1 were $4
               million. The net unfavorable effect of adoption on the Marathon
               Group's income from operations at January 1, 1997, was $7
               million.

                    In June 1998, the Financial Accounting Standards Board
               issued Statement of Financial Accounting Standards No. 133,
               "Accounting for Derivative Instruments and Hedging Activities"
               (SFAS No. 133). This new Standard requires recognition of all
               derivatives as either assets or liabilities at fair value. SFAS
               No. 133 may result in additional volatility in both current
               period earnings and other comprehensive income as a result of
               recording recognized and unrecognized gains and losses resulting
               from changes in the fair value of derivative instruments. The
               transition adjustment resulting from adoption of SFAS No. 133
               will be reported as a cumulative effect of a change in accounting
               principle.

                    Under the new Standard, USX may elect not to designate
               certain derivative instruments as hedges even if the strategy
               qualifies for hedge accounting treatment. This approach would
               eliminate the administrative effort needed to measure
               effectiveness and monitor such instruments; however, this
               approach also may result in additional volatility in current
               period earnings.

                    USX cannot reasonably estimate the effect of adoption on
               either the financial position or results of operations. It is not
               possible to estimate what effect this Statement will have on
               future results of operations, although greater period-to-period
               volatility is likely. USX plans to adopt the Standard effective
               January 1, 2001.

                                                                             M-7


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

4.   Corporate Activities

               Financial activities - As a matter of policy, USX manages most
               financial activities on a centralized, consolidated basis. Such
               financial activities include the investment of surplus cash; the
               issuance, repayment and repurchase of short-term and long-term
               debt; the issuance, repurchase and redemption of preferred stock;
               and the issuance and repurchase of common stock. Transactions
               related primarily to invested cash, short-term and long-term debt
               (including convertible debt), related net interest and other
               financial costs, and preferred stock and related dividends are
               attributed to the Marathon Group, the U. S. Steel Group and,
               prior to November 1, 1997, the Delhi Group based upon the cash
               flows of each group for the periods presented and the initial
               capital structure of each group. Most financing transactions are
               attributed to and reflected in the financial statements of all
               groups. See Note 9, for the Marathon Group's portion of USX's
               financial activities attributed to all groups. However,
               transactions such as leases, certain collaterized financings,
               certain indexed debt instruments, financial activities of
               consolidated entities which are less than wholly owned by USX and
               transactions related to securities convertible solely into any
               one class of common stock are or will be specifically attributed
               to and reflected in their entirety in the financial statements of
               the group to which they relate.

               Corporate general and administrative costs - Corporate general
               and administrative costs are allocated to the Marathon Group, the
               U. S. Steel Group and, prior to November 1, 1997, the Delhi Group
               based upon utilization or other methods management believes to be
               reasonable and which consider certain measures of business
               activities, such as employment, investments and sales. The costs
               allocated to the Marathon Group were $26 million in 1999, $28
               million in 1998 and $37 million in 1997, and primarily consist of
               employment costs including pension effects, professional
               services, facilities and other related costs associated with
               corporate activities.

               Income taxes - All members of the USX affiliated group are
               included in the consolidated United States federal income tax
               return filed by USX. Accordingly, the provision for federal
               income taxes and the related payments or refunds of tax are
               determined on a consolidated basis. The consolidated provision
               and the related tax payments or refunds have been reflected in
               the Marathon Group, the U. S. Steel Group and, prior to November
               1, 1997, the Delhi Group financial statements in accordance with
               USX's tax allocation policy. In general, such policy provides
               that the consolidated tax provision and related tax payments or
               refunds are allocated among the Marathon Group, the U. S. Steel
               Group and, prior to November 1, 1997, the Delhi Group, for group
               financial statement purposes, based principally upon the
               financial income, taxable income, credits, preferences and other
               amounts directly related to the respective groups.

                    For tax provision and settlement purposes, tax benefits
               resulting from attributes (principally net operating losses and
               various tax credits), which cannot be utilized by one of the
               groups on a separate return basis but which can be utilized on a
               consolidated basis in that year or in a carryback year, are
               allocated to the group that generated the attributes. To the
               extent that one of the groups is allocated a consolidated tax
               attribute which, as a result of expiration or otherwise, is not
               ultimately utilized on the consolidated tax return, the prior
               years' allocation of such attribute is adjusted such that the
               effect of the expiration is borne by the group that generated the
               attribute. Also, if a tax attribute cannot be utilized on a
               consolidated basis in the year generated or in a carryback year,
               the prior years' allocation of such consolidated tax effects is
               adjusted in a subsequent year to the extent necessary to allocate
               the tax benefits to the group that would have realized the tax
               benefits on a separate return basis. As a result, the allocated
               group amounts of taxes payable or refundable are not necessarily
               comparable to those that would have resulted if the groups had
               filed separate tax returns.

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

5.   Business Combinations

               In August 1998, Marathon acquired Tarragon Oil and Gas Limited
               (Tarragon), a Canadian oil and gas exploration and production
               company. Securityholders of Tarragon received, at their election,
               Cdn$14.25 for each Tarragon share, or the economic equivalent in
               Exchangeable Shares of an indirect Canadian subsidiary of
               Marathon, which are exchangeable solely on a one-for-one basis
               into Marathon Stock. The purchase price included cash payments of
               $686 million, issuance of 878,074 Exchangeable Shares valued at
               $29 million and the assumption of $345 million in debt.

                    The Exchangeable Shares are exchangeable at the option of
               the holder at any time and automatically redeemable on August 11,
               2003 (and, in certain circumstances, as early as August 11,
               2001). The holders of Exchangeable Shares are entitled to receive
               declared dividends equivalent to dividends declared from time to
               time by USX on Marathon Stock.

                    Marathon accounted for the acquisition using the purchase
               method of accounting. The 1998 results of operations include the
               operations of Marathon Canada Limited, formerly known as
               Tarragon, commencing August 12, 1998.

M-8


                    During 1997, Marathon and Ashland Inc. (Ashland) agreed to
               combine the major elements of their refining, marketing and
               transportation (RM&T) operations. On January 1, 1998, Marathon
               transferred certain RM&T net assets to Marathon Ashland Petroleum
               LLC (MAP), a new consolidated subsidiary. Also on January 1,
               1998, Marathon acquired certain RM&T net assets from Ashland in
               exchange for a 38% interest in MAP. The acquisition was accounted
               for under the purchase method of accounting. The purchase price
               was determined to be $1.9 billion, based upon an external
               valuation. The change in Marathon's ownership interest in MAP
               resulted in a gain of $245 million, which is included in 1998
               revenues. In accordance with MAP closing agreements, Marathon and
               Ashland made capital contributions to MAP for environmental
               improvements. The closing agreements stipulate that ownership
               interests in MAP will not be adjusted as a result of such
               contributions. Accordingly, Marathon recognized a gain on
               ownership change of $17 million in 1999.

                    In connection with the formation of MAP, Marathon and
               Ashland entered into a Limited Liability Company Agreement dated
               January 1, 1998 (the LLC Agreement). The LLC Agreement provides
               for an initial term of MAP expiring on December 31, 2022 (25
               years from its formation). The term will automatically be
               extended for ten-year periods, unless a termination notice is
               given by either party.

                    Also in connection with the formation of MAP, the parties
               entered into a Put/Call, Registration Rights and Standstill
               Agreement (the Put/Call Agreement). The Put/Call Agreement
               provides that at any time after December 31, 2004, Ashland will
               have the right to sell to Marathon all of Ashland's ownership
               interest in MAP, for an amount in cash and/or Marathon or USX
               debt or equity securities equal to the product of 85% (90% if
               equity securities are used) of the fair market value of MAP at
               that time, multiplied by Ashland's percentage interest in MAP.
               Payment could be made at closing, or at Marathon's option, in
               three equal annual installments, the first of which would be
               payable at closing. At any time after December 31, 2004, Marathon
               will have the right to purchase all of Ashland's ownership
               interests in MAP, for an amount in cash equal to the product of
               115% of the fair market value of MAP at that time, multiplied by
               Ashland's percentage interest in MAP.

                    The following unaudited pro forma data for the Marathon
               Group includes the results of operations of Tarragon for 1998 and
               1997, and the Ashland RM&T net assets for 1997, giving effect to
               the acquisitions as if they had been consummated at the beginning
               of the years presented. The pro forma data is based on historical
               information and does not necessarily reflect the actual results
               that would have occurred nor is it necessarily indicative of
               future results of operations.



               (In millions, except per share amounts)        1998                 1997
               -------------------------------------------------------------------------------------
                                                                          
               Revenues                                     $ 22,071            $ 23,425
               Net income                                        279 /(a)/           457 /(a)/
               Net income per common share -
                    Basic and diluted                            .95                1.58
               -------------------------------------------------------------------------------------

               /(a)/   Excluding the pro forma inventory market valuation
                       adjustment, pro forma net income would have been $383
                       million in 1998 and $619 million in 1997. Reported net
                       income, excluding the reported inventory market valuation
                       adjustment, would have been $414 million in 1998 and $635
                       million in 1997.

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

6.   Transactions Between MAP and Ashland

               At December 31, 1999 and 1998, MAP had current receivables from
               Ashland of $26 million and $22 million, respectively, and current
               payables to Ashland of $2 million at December 31, 1999, and at
               December 31, 1998, $106 million, including distributions payable.

                    At December 31, 1998, MAP's cash and cash equivalents
               included a $103 million demand note invested with Ashland, which
               was repaid in January 1999.

                    MAP has a $190 million short-term revolving credit agreement
               with Ashland. Interest on borrowings is based on the Federal
               Funds Rate in effect each day during the period plus 0.30 of 1%.
               At December 31, 1999, there were no borrowings against this
               facility.

                    During 1999 and 1998, MAP's sales to Ashland consisting
               primarily of petroleum products, were $198 million and $185
               million, respectively, and MAP's purchases of products and
               services from Ashland were $25 million and $45 million,
               respectively. These transactions were conducted under terms
               comparable to those with unrelated parties.

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

7.   Revenues

               The items below are included in revenues and costs and expenses,
               with no effect on income.



               (In millions)                                             1999     1998    1997
               ---------------------------------------------------------------------------------
                                                                                
               Consumer excise taxes on petroleum products
                and merchandise                                        $ 3,973  $ 3,824  $ 2,828
               Matching crude oil and refined product
                buy/sell transactions settled in cash                    3,539    3,948    2,436
               ---------------------------------------------------------------------------------


                                                                             M-9


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

8.   Other Items



               (In millions)                                                         1999     1998    1997
               -----------------------------------------------------------------------------------------------
                                                                                            
               Net interest and other financial costs
                 Interest and other financial income/(a)/:
                   Interest income                                                  $  15    $  30   $   7
                   Other                                                              (13)       4      (6)
                                                                                    -----    -----   -----
                     Total                                                              2       34       1
                                                                                    -----    -----   -----
               Interest and other financial costs/(a)/:
                   Interest incurred                                                  281      285    232
                   Less interest capitalized                                           20       40     24
                                                                                    -----    -----  -----
                     Net interest                                                     261      245    208
                   Interest on tax issues                                               5        5      7
                   Financial costs on preferred stock of subsidiary                    17       17     16
                   Amortization of discounts                                            2        4      4
                   Expenses on sales of accounts receivable                             -        -     19
                   Other                                                                5        -      7
                                                                                    -----    -----  -----
                     Total                                                            290      271    261
                                                                                    -----    -----  -----
                 Net interest and other financial costs/(a)/                        $ 288    $ 237  $ 260
               -----------------------------------------------------------------------------------------------

               /(a)/  See Note 4, for discussion of USX net interest and
                      other financial costs attributable to the Marathon
                      Group.
               ----------------------------------------------------------------

               Foreign currency transactions

               For 1999, 1998 and 1997, the aggregate foreign currency
               transaction gains (losses) included in determining net income
               were $(12) million, $13 million and $4 million, respectively.

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

9.   Financial Activities Attributed to Groups

               The following is the portion of USX financial activities
               attributed to the Marathon Group. These amounts exclude amounts
               specifically attributed to the Marathon Group.



                                                                           Marathon Group       Consolidated USX/(a)/
                                                                           --------------       ---------------------
               (In millions)                      December 31             1999        1998        1999         1998
               ------------------------------------------------------------------------------------------------------
                                                                                                   
               Cash and cash equivalents                                $    8        $    4      $    9       $    4
               Other noncurrent assets                                       7             7           8            8
                                                                        ------        ------      ------       ------
                Total assets                                            $   15        $   11      $   17       $   12
               ------------------------------------------------------------------------------------------------------
               Notes payable                                            $    -        $  132      $    -       $  145
               Accrued interest                                             82            80          95           88
               Long-term debt due within one year (Note 12)                 47            59          54           66
               Long-term debt (Note 12)                                  3,305         3,456       3,771        3,762
               Preferred stock of subsidiary                               184           184         250          250
                                                                        ------        ------      ------       ------
                Total liabilities                                       $3,618        $3,911      $4,170       $4,311
               ------------------------------------------------------------------------------------------------------

                                                                        Marathon Group/(b)/              Consolidated USX
                                                                        -------------------              ----------------
               (In millions)                                          1999      1998      1997       1999        1998       1997
               ------------------------------------------------------------------------------------------------------------------
               Net interest and other financial costs (Note 8)       $  295    $  295    $  246     $  334       $ 324      $ 309
               ------------------------------------------------------------------------------------------------------------------

             /(a)/  For details of USX long-term debt and preferred stock of
                    subsidiary, see Notes 16 and 23, respectively, to the USX
                    consolidated financial statements.
             /(b)/  The Marathon Group's net interest and other financial costs
                    reflect weighted average effects of all financial activities
                    attributed to all groups.

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

10.  Segment Information

               The Marathon Group's operations consists of three reportable
               operating segments: 1) Exploration and Production - explores for
               and produces crude oil and natural gas on a worldwide basis; 2)
               Refining, Marketing and Transportation - refines, markets and
               transports crude oil and petroleum products, primarily in the
               Midwest and southeastern United States through MAP; and 3) Other
               Energy Related Businesses. Other Energy Related Businesses is an
               aggregation of two segments which fall below the quantitative
               reporting thresholds: 1) Natural Gas and Crude Oil Marketing and
               Transportation - markets and transports its own and third-party
               natural gas and crude oil in the United States; and
               2)   Power Generation - develops, constructs and operates
               independent electric power projects worldwide.

M-10


     Sales by product line are:


(In millions)                                           1999     1998    1997
- --------------------------------------------------------------------------------
                                                               
Refined products                                       $10,873  $8,750  $7,012
Merchandise                                              2,088   1,873   1,045
Liquid hydrocarbons                                      2,159   1,818     941
Natural gas                                              1,381   1,144   1,331
Transportation and other products                          199     271     167
- --------------------------------------------------------------------------------


     Segment income represents income from operations allocable to operating
segments. USX corporate general and administrative costs are not allocated to
operating segments. These costs primarily consist of employment costs including
pension effects, professional services, facilities and other related costs
associated with corporate activities. Certain general and administrative costs
related to all Marathon Group operating segments in excess of amounts billed to
MAP under service contracts and amounts charged out to operating segments under
Marathon's shared services procedures also are not allocated to operating
segments. Additionally, the following items are not allocated to operating
segments: inventory market valuation adjustments, gain on ownership change in
MAP and certain other items not allocated to operating segments for business
performance reporting purposes (see (a) in reconcilement table on page M-12).



                                                                                             Refining,       Other
                                                                            Exploration      Marketing      Energy
                                                                                and             and         Related
(In millions)                                                               Production    Transportation   Businesses    Total
- --------------------------------------------------------------------------------------------------------------------------------
                                                                                                             
1999
Revenues:
 Customer                                                                        $3,230           $20,210         $731   $24,171
 Intersegment/(a)/                                                                  202                47           40       289
 Intergroup/(a)/                                                                     19                 -           22        41
 Equity in earnings (losses) of unconsolidated affiliates                            (2)               17           26        41
 Other                                                                               30                48           15        93
                                                                                 ------           -------         ----   -------
  Total revenues                                                                 $3,479           $20,322         $834   $24,635
                                                                                 ======           =======         ====   =======
Segment income                                                                   $  618           $   611         $ 61   $ 1,290
Significant noncash items included in segment income:
Depreciation, depletion and amortization/(b)/                                       638               280            5       923
Pension expenses/(c)/                                                                 3                32            2        37
Capital expenditures/(d)/                                                           744               612            4     1,360
Affiliates - investments                                                             56                 -            3        59
- --------------------------------------------------------------------------------------------------------------------------------
1998
Revenues:
 Customer                                                                        $2,085           $19,192         $306   $21,583
 Intersegment/(a)/                                                                  144                10           17       171
 Intergroup/(a)/                                                                     13                 -            7        20
 Equity in earnings of unconsolidated affiliates                                      2                12           14        28
 Other                                                                               26                40           11        77
                                                                                 ------           -------         ----   -------
  Total revenues                                                                 $2,270           $19,254         $355   $21,879
                                                                                 ======           =======         ====   =======
Segment income                                                                   $  278           $   896         $ 33   $ 1,207
Significant noncash items included in segment income:
Depreciation, depletion and amortization/(b)/                                       581               272            6       859
Pension expenses/(c)/                                                                 3                16            2        21
Capital expenditures/(d)/                                                           839               410            8     1,257
Affiliates - investments/(d)/                                                         -                22           17        39
- --------------------------------------------------------------------------------------------------------------------------------
1997
Revenues:
 Customer                                                                        $1,575           $13,698         $381   $15,654
 Intersegment/(a)/                                                                  619                 -            -       619
 Intergroup/(a)/                                                                     99                 -            6       105
 Equity in earnings of unconsolidated affiliates                                     14                 4            7        25
 Other                                                                                7                20           30        57
                                                                                 ------           -------         ----   -------
  Total revenues                                                                 $2,314           $13,722         $424   $16,460
                                                                                 ======           =======         ====   =======
Segment income                                                                   $  773           $   563         $ 48   $ 1,384
Significant noncash items included in segment income:
Depreciation, depletion and amortization/(b)/                                       469               173            7       649
Pension expenses/(c)/                                                                 3                 8            1        12
Capital expenditures/(d)/                                                           810               205            6     1,021
Affiliates - investments/(d)/                                                       114                 -           73       187
- --------------------------------------------------------------------------------------------------------------------------------


/(a)/  Intersegment and intergroup sales and transfers were conducted under
       terms comparable to those with unrelated parties.
/(b)/  Differences between segment totals and group totals represent amounts
       included in administrative expenses and, in 1999 and 1998, international
       and domestic exploration and production property impairments.
/(c)/  Differences between segment totals and group totals represent amounts
       included in administrative expenses.
/(d)/  Differences between segment totals and group totals represent amounts
       related to corporate administrative activities.


     The following reconciles segment revenues and income to amounts reported in
     the Marathon Group financial statements:



(In millions)                                                            1999      1998      1997
- ---------------------------------------------------------------------------------------------------
                                                                                  
Revenues:
  Revenues of reportable segments                                      $24,635   $21,879   $16,460
  Items not allocated to segments:
    Gain on ownership change in MAP                                         17       245         -
    Other                                                                  (36)       24         -
  Elimination of intersegment revenues                                    (289)     (171)     (619)
  Administrative revenues                                                    -         -         5
                                                                       -------   -------   -------
     Total Group revenues                                              $24,327   $21,977   $15,846
                                                                       =======   =======   =======
Income:
  Income for reportable segments                                       $ 1,290   $ 1,207   $ 1,384
  Items not allocated to segments:
    Gain on ownership change in MAP                                         17       245         -
    Administrative expenses                                               (108)     (106)     (168)
    Inventory market valuation adjustments                                 551      (267)     (284)
    Other/(a)/                                                             (37)     (141)        -
                                                                       -------   -------   -------
  Total Group income from operations                                   $ 1,713   $   938   $   932
- ---------------------------------------------------------------------------------------------------


/(a)/  Represents in 1999, primarily certain domestic exploration and production
       impairments, net losses on certain asset sales and costs of a voluntary
       early retirement program. Represents in 1998 certain international
       exploration and production property impairments, certain suspended
       exploration well write-offs, a gas contract settlement and MAP transition
       charges.

Geographic Area:

          The information below summarizes the operations in different
geographic areas. Transfers between geographic areas are at prices which
approximate market.



                                                                      Revenues
                                                --------------------------------------------
                                                     Within            Between
(In millions)                             Year  Geographic Areas  Geographic Areas    Total    Assets/(a)/
- ----------------------------------------------------------------------------------------------------------
                                                                                
United States                             1999        $23,337         $   -          $23,337    $ 7,555
                                          1998         21,191             -           21,191      7,659
                                          1997         15,123             -           15,123      5,578
Canada                                    1999            425           521              946      1,112
                                          1998            209           368              577      1,094
United Kingdom                            1999            459             -              459      1,581
                                          1998            462             -              462      1,739
                                          1997            593             -              593      1,856
Other Foreign Countries                   1999            106            88              194        735
                                          1998            115            52              167        468
                                          1997            130            39              169        530
Eliminations                              1999              -          (609)            (609)         -
                                          1998              -          (420)            (420)         -
                                          1997              -           (39)             (39)         -
  Total                                   1999        $24,327         $   -          $24,327    $10,983
                                          1998         21,977             -           21,977     10,960
                                          1997         15,846             -           15,846      7,964
- ----------------------------------------------------------------------------------------------------------

/(a)/   Includes property, plant and equipment and investments in affiliates.

- --------------------------------------------------------------------------------
11. Leases

               Future minimum commitments for capital leases (including sale-
               leasebacks accounted for as financings) and for operating leases
               having remaining noncancelable lease terms in excess of one year
               are as follows:


                                                                                 Capital      Operating
               (In millions)                                                     Leases        Leases
               ----------------------------------------------------------------------------------------
                                                                                      
               2000                                                              $    2        $  198
               2001                                                                   2            77
               2002                                                                   2            64
               2003                                                                   2            40
               2004                                                                   2            33
               Later years                                                           14           120
               Sublease rentals                                                       -           (35)
                                                                                 ------        ------
                Total minimum lease payments                                         24        $  497
                                                                                 ======        ======
               Less imputed interest costs                                           (9)
                                                                                 ------
                Present value of net minimum lease payments
                 included in long-term debt                                      $   15
               ----------------------------------------------------------------------------------------
                  Operating lease rental expense:
               (In millions)                                           1999          1998          1997
               ----------------------------------------------------------------------------------------
               Minimum rental                                         $ 142         $ 157         $ 102
               Contingent rental                                         11            10            10
               Sublease rentals                                          (6)           (7)           (7)
                                                                      -----         -----         -----
                Net rental expense                                    $ 147         $ 160         $ 105
               ----------------------------------------------------------------------------------------


M-12


                The Marathon Group leases a wide variety of facilities and
             equipment under operating leases, including land and building
             space, office equipment, production facilities and transportation
             equipment. Most long-term leases include renewal options and, in
             certain leases, purchase options. In the event of a change in
             control of USX, as defined in the agreements, or certain other
             circumstances, operating lease obligations totaling $104 million
             may be declared immediately due and payable.

- --------------------------------------------------------------------------------
12. Long-Term Debt

                The Marathon Group's portion of USX's consolidated long-term
             debt is as follows:


                                                                     Marathon Group       Consolidated USX/(a)/
                                                                 ----------------------  ----------------------
             (In millions)             December 31                  1999         1998         1999        1998
             --------------------------------------------------------------------------------------------------
                                                                                         
              Specifically attributed debt/(b)/:
                Receivables facility                                 $    -      $    -      $  350      $    -
                Sale-leaseback financing and capital leases              15           -         107          95
                Indexed debt less unamortized discount                    -           -           -          68
                Other                                                     1           -           1           -
                                                                     ------      ------      ------      ------
                 Total                                                   16           -         458         163
              Less amount due within one year                             1           -           7           5
                                                                     ------      ------      ------      ------
                 Total specifically attributed long-term debt        $   15      $    -      $  451      $  158
             --------------------------------------------------------------------------------------------------
             Debt attributed to groups/(c)/                          $3,375      $3,537      $3,852      $3,853
              Less unamortized discount                                  23          22          27          25
              Less amount due within one year                            47          59          54          66
                                                                     ------      ------      ------      ------
                 Total long-term debt attributed to groups           $3,305      $3,456      $3,771      $3,762
             --------------------------------------------------------------------------------------------------
             Total long-term debt due within one year                $   48      $   59      $   61      $   71
             Total long-term debt due after one year                  3,320       3,456       4,222       3,920
             --------------------------------------------------------------------------------------------------

             /(a)/   See Note 16, to the USX consolidated financial statements
                     for details of interest rates, maturities and other terms
                     of long-term debt.
             /(b)/   As described in Note 4, certain financial activities are
                     specifically attributed only to the Marathon Group and the
                     U. S. Steel Group.
             /(c)/   Most long-term debt activities of USX Corporation and its
                     wholly owned subsidiaries are attributed to all groups (in
                     total, but not with respect to specific debt issues) based
                     on their respective cash flows (Notes 4, 9 and 13).



- --------------------------------------------------------------------------------------------------------------------------
13. Supplemental Cash Flow Information

              (In millions)                                                                     1999       1998       1997
              ------------------------------------------------------------------------------------------------------------
                                                                                                     
              Cash used in operating activities included:
               Interest and other financial costs paid (net of amount capitalized)           $   (289)  $   (260)  $  (257)
               Income taxes paid, including settlements with other groups                        (101)      (154)     (178)
              ------------------------------------------------------------------------------------------------------------
              USX debt attributed to all groups - net:
               Commercial paper  - issued                                                    $  6,282   $      -   $     -
                                 - repayments                                                  (6,117)         -         -
               Credit agreements - borrowings                                                   5,529     17,486    10,454
                                 - repayments                                                  (5,980)   (16,817)  (10,449)
               Other credit arrangements - net                                                    (95)        55        36
               Other debt -  borrowings                                                           319        671        10
                          -  repayments                                                           (87)    (1,053)     (741)
                                                                                             --------   --------   -------
                  Total                                                                      $   (149)  $    342   $  (690)
              ------------------------------------------------------------------------------------------------------------


               Marathon Group activity                                                       $   (296)  $    329   $    97
               U. S. Steel Group activity                                                         147         13      (561)
               Delhi Group activity                                                                 -          -      (226)
                                                                                             --------   --------   -------
                  Total                                                                      $   (149)  $    342   $  (690)
              ------------------------------------------------------------------------------------------------------------
              Noncash investing and financing activities:
               Marathon Stock issued for dividend reinvestment and
                employee stock plans                                                         $      4   $      3   $     5
               Marathon Stock issued for Exchangeable Shares                                        7         11         -
               Affiliate preferred stock received in conversion of affiliate loan                 142          -         -
               Disposal of assets:
                Notes received                                                                     19          -         -
                Liabilities assumed by buyers                                                       -          -         5
               Business combinations:
                Acquisition of Tarragon:
                 Exchangeable Shares issued                                                         -         29         -
                 Liabilities assumed                                                                -        433         -
                Acquisition of Ashland RM&T net assets:
                 38% interest in MAP                                                                -      1,900         -
                 Liabilities assumed                                                                -      1,038         -
                Other acquisitions - liabilities assumed                                            16         -         -
              ------------------------------------------------------------------------------------------------------------


                                                                            M-13


- --------------------------------------------------------------------------------
14. Pensions and Other Postretirement Benefits

             The Marathon Group has noncontributory defined benefit pension
             plans covering substantially all employees. Benefits under these
             plans are based primarily upon years of service and final average
             pensionable earnings. Certain subsidiaries provide benefits for
             employees covered by other plans based primarily upon employees'
             service and career earnings.

                 The Marathon Group also has defined benefit retiree health and
             life insurance plans (other benefits) covering most employees upon
             their retirement. Health benefits are provided through
             comprehensive hospital, surgical and major medical benefit
             provisions or through health maintenance organizations, both
             subject to various cost sharing features. Life insurance benefits
             are provided to certain nonunion and most union represented retiree
             beneficiaries primarily based on employees' annual base salary at
             retirement. Other benefits have not been prefunded.


                                                                         Pension Benefits                      Other Benefits
                                                               ----------------------------------        ---------------------------
             (In millions)                                         1999                  1998                1999         1998
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                          
             Change in benefit obligations
             Benefit obligations at January 1                  $      1,080          $        771        $       597  $         381
             Service cost                                                65                    48                 17             12
             Interest cost                                               67                    57                 36             31
             Plan amendments                                             18                     6                (44)           (20)
             Actuarial (gains) losses                                  (197)                  121               (108)           112
             Plan merger and acquisition                                 14                   145                  4             98
             Settlements, curtailments and termination benefits        (122)                    -                  -              -
             Benefits paid                                              (57)                  (68)               (24)           (17)
                                                               ------------          ------------        -----------  --------------
             Benefit obligations at December 31                $        868          $      1,080        $       478  $         597
             -----------------------------------------------------------------------------------------------------------------------
             Change in plan assets
             Fair value of plan assets at January 1            $      1,331          $      1,150
             Actual return on plan assets                               136                   199
             Plan merger and acquisition                                 12                    55
             Employer contributions                                       2                     8
             Trustee distributions/(a)/                                 (16)                  (14)
             Settlements paid                                           (99)                    -
             Benefits paid from plan assets                             (56)                  (67)
                                                               ------------          ------------
             Fair value of plan assets at December 31          $      1,310          $      1,331
             -----------------------------------------------------------------------------------------------------------------------
             Funded status of plans at December 31             $        442 /(b)/    $        251 /(b)/  $    (478)   $        (597)
             Unrecognized net gain from transition                      (26)                 (35)                -                -
             Unrecognized prior service costs (credits)                  63                   48               (72)             (35)
             Unrecognized actuarial (gains) losses                     (306)                 (88)               68              182
             Additional minimum liability/(c)/                           (8)                 (18)                -                -
                                                               ------------         ------------         -----------  --------------
             Prepaid (accrued) benefit cost                    $        165         $        158         $      (482) $        (450)
             -----------------------------------------------------------------------------------------------------------------------



                                                                                              
             /(a)/  Represents transfers of excess pension assets to fund
                    retiree health care benefits accounts under Section 420 of
                    the Internal Revenue Code.
             /(b)/  Includes several plans that have accumulated benefit
                      obligations in excess of plan assets:
                        Aggregate accumulated benefit obligations                    $(24)          $(36)
                        Aggregate projected benefit obligations                       (37)           (52)
                        Aggregate plan assets                                           -              -
             /(c)/  Additional minimum liability recorded was offset
                      by the following:
                        Intangible asset                                             $  3           $  2
                                                                                     ----           ----
                      Accumulated other comprehensive income (losses):
                       Beginning of year                                            $ (10)          $ (7)
                       Change during year (net of tax)                                  7             (3)
                                                                                     ----           ----
                       Balance at end of year                                       $ (3)           $(10)
              -------------------------------------------------------------------------------------------------------------




                                                                           Pension Benefits               Other Benefits
                                                                  ------------------------------   ---------------------------
             (In millions)                                         1999         1998       1997       1999     1998      1997
             -----------------------------------------------------------------------------------------------------------------
                                                                                                      
             Components of net periodic
              benefit cost (credit)
             Service cost                                        $  65         $  48      $  31      $  17    $  12     $   6
             Interest cost                                          67            57         45         36       31        22
             Expected return on plan assets                       (114)         (107)       (85)         -        -         -
             Amortization     -   net transition gain               (5)           (5)        (5)         -        -         -
                              -   prior service costs                4             3          1         (8)      (3)       (3)
                                  (credits)
                              -   actuarial losses                   1             -          1          7        3         -
             Other plans                                             5             5          4          -        -         -
             Settlement
              and
              termination
              gain                                                  (7) /(a)/      -          -          -        -         -
                                                                 -----         -----      -----      -----    -----     -----
             Net periodic benefit cost (credit)                  $  16         $   1      $  (8)     $  52    $  43     $  25
             ---------------------------------------------------------------------------------------------------------------

             /(a)/  Includes 1999 voluntary early retirement program.

M-14




                                                        Pension Benefits    Other Benefits
                                                       ------------------  ----------------
                                                         1999      1998     1999     1998
             ------------------------------------------------------------------------------
                                                                         
             Weighted average actuarial assumptions
              at December 31:
             Discount rate                                 8.0%      6.5%     8.0%     6.5%
             Expected annual return on plan assets         9.5%      9.5%     9.5%     9.5%
             Increase in compensation rate                 5.0%      5.0%     5.0%     5.0%
             ------------------------------------------------------------------------------


                 For measurement purposes, an 8% annual rate of increase in the
             per capita cost of covered health care benefits was assumed for
             2000. The rate was assumed to decrease gradually to 5% for 2006 and
             remain at that level thereafter.

                 A one-percentage-point change in assumed health care cost trend
             rates would have the following effects:



                                                                        1-Percentage-    1-Percentage-
             (In millions)                                              Point Increase  Point Decrease
             ------------------------------------------------------------------------------------------
                                                                                  
             Effect on total of service and interest cost components       $       8       $      (6)
             Effect on other postretirement benefit obligations                   58             (48)
             ------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
15. Dividends

             In accordance with the USX Restated Certificate of Incorporation,
             dividends on the Marathon Stock and Steel Stock are limited to the
             legally available funds of USX. 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. Subject
             to this limitation, the Board of Directors intends to declare and
             pay dividends on the Marathon Stock based on the financial
             condition and results of operations of the Marathon Group, although
             it has no obligation under Delaware law to do so. In making its
             dividend decisions with respect to Marathon Stock, the Board of
             Directors considers among other things, the long-term earnings and
             cash flow capabilities of the Marathon Group as well as the
             dividend policies of similar publicly traded energy companies.


- --------------------------------------------------------------------------------
16. Property, Plant and Equipment




             (In millions)                                 December 31                    1999         1998
             --------------------------------------------------------------------------------------------------
                                                                                              
             Production                                                                    $14,568      $14,707
             Refining                                                                        2,439        2,251
             Marketing                                                                       2,197        2,103
             Transportation                                                                  1,374        1,402
             Other                                                                             282          265
                                                                                           -------      -------
                 Total                                                                      20,860       20,728
             Less accumulated depreciation, depletion and amortization                      10,567       10,299
                                                                                           -------      -------
                 Net                                                                       $10,293      $10,429
             --------------------------------------------------------------------------------------------------


                 Property, plant and equipment at December 31, 1999, includes
             gross assets acquired under capital leases of $20 million with no
             related amounts in accumulated depreciation, depletion and
             amortization.

- --------------------------------------------------------------------------------
17. Common Stockholders' Equity



             (In millions, except per share data)                      1999     1998     1997
             ---------------------------------------------------------------------------------
                                                                               
             Balance at beginning of year                             $4,312   $3,618   $3,340
              Net income                                                 654      310      456
              Marathon Stock issued                                       96      617       39
              Exchangeable Shares:
               Issued                                                      -       29        -
               Exchanged for Marathon Stock                               (7)     (12)       -
              Dividends on Marathon Stock
               (per share: $.84 in 1999 and 1998 and $.76 in 1997)      (261)    (248)    (219)
              Deferred compensation                                        -        2        1
              Accumulated other comprehensive income (loss)/(a)/:
               Foreign currency translation adjustments                   (1)       2        -
               Minimum pension liability adjustments (Note 14)             7       (3)      (2)
               Unrealized holding gains (losses) on investments            -       (3)       3
                                                                      ------   ------   ------
             Balance at end of year                                   $4,800   $4,312   $3,618
             ---------------------------------------------------------------------------------

             /(a)/  See page U-7 of the USX consolidated financial statements
                    relative to the annual activity of these adjustments and
                    gains (losses). Total comprehensive income for the Marathon
                    Group for the years 1999, 1998 and 1997 was $660 million,
                    $306 million and $457 million, respectively.

                                                                            M-15


18. Income Taxes
             Income tax provisions and related assets and liabilities attributed
             to the Marathon Group are determined in accordance with the USX
             group tax allocation policy (Note 4).

                Provisions (credits) for estimated income taxes were:



                                                    1999                         1998                            1997
                                        --------------------------    --------------------------     ---------------------------
                    (In millions)       Current   Deferred   Total    Current   Deferred   Total     Current   Deferred    Total
                    ------------------------------------------------------------------------------------------------------------
                                                                                               
                    Federal              $191      $ 158      $349      $ 83     $  19     $ 102      $  171    $  (5)    $  166
                    State and local         3         (7)       (4)       30         9        39           3        7         10
                    Foreign                25        (46)      (21)        3        (2)        1          12       28         40
                                         ----      -----      ----      ----     -----     -----      ------    -----     ------
                         Total           $219      $ 105      $324      $116     $  26     $ 142      $  186    $  30     $  216
                    ------------------------------------------------------------------------------------------------------------

                         A reconciliation of federal statutory tax rate (35%) to
                         total provisions follows:


                    (In millions)                                                       1999            1998              1997
                    ------------------------------------------------------------------------------------------------------------
                                                                                                                
                    Statutory rate applied to income before income taxes                $ 342          $  158            $  235
                    Effects of foreign operations, including foreign tax credits          (18)            (26)               (8)
                    State and local income taxes after federal income tax effects          (3)             25                 6
                    Credits other than foreign tax credits                                 (7)             (9)               (9)
                    Effects of partially owned companies                                   (5)             (4)               (6)
                    Dispositions of subsidiary investments                                  7               -                 -
                    Adjustment of prior years' federal income taxes                         4              (5)               (4)
                    Adjustment of valuation allowances                                      -               -                (4)
                    Other                                                                   4               3                 6
                                                                                        -----          ------            ------
                         Total provisions                                               $ 324          $  142            $  216
                    ------------------------------------------------------------------------------------------------------------

                         Deferred tax assets and liabilities resulted from the following:


                    (In millions)                                                        December 31          1999        1998
                    ------------------------------------------------------------------------------------------------------------
                                                                                                                  
                    Deferred tax assets:
                     Minimum tax credit carryforwards                                                       $      -    $    15
                     State tax loss carryforwards (expiring in 2000 through 2018)                                 57         54
                     Foreign tax loss carryforwards (portion of which expire in 2000 through 2014)               382        414
                     Employee benefits                                                                           206        201
                     Receivables, payables, and debt                                                              14         13
                     Expected federal benefit for:
                      Crediting certain foreign deferred income taxes                                            530        528
                      Deducting state and other foreign deferred income taxes                                     36         51
                     Contingency and other accruals                                                              150        140
                     Investments in foreign subsidiaries                                                          52         52
                     Investments in subsidiaries and affiliates                                                   20         22
                     Other                                                                                        34         38
                     Valuation allowances:
                      Federal                                                                                    (30)       (30)
                      State                                                                                      (11)        (8)
                      Foreign                                                                                   (282)      (260)
                                                                                                            --------    -------
                         Total deferred tax assets/(a)/                                                        1,158      1,230
                                                                                                            --------    -------
                     Deferred tax liabilities:
                      Property, plant and equipment                                                            2,065      2,158
                      Inventory                                                                                  324        170
                      Prepaid pensions                                                                           127        125
                      Other                                                                                      111        150
                                                                                                            --------    -------
                         Total deferred tax liabilities                                                        2,627      2,603
                                                                                                            --------    -------
                          Net deferred tax liabilities                                                      $  1,469    $ 1,373
                    ------------------------------------------------------------------------------------------------------------


             /(a)/ USX expects to generate sufficient future taxable income to
                   realize the benefit of the Marathon Group's deferred tax
                   assets. In addition, the ability to realize the benefit of
                   foreign tax credits is based upon certain assumptions
                   concerning future operating conditions (particularly as
                   related to prevailing oil prices), income generated from
                   foreign sources and USX's tax profile in the years that such
                   credits may be claimed.

                       The consolidated tax returns of USX for the years 1990
         through 1997 are under various stages of audit and administrative
         review by the IRS. USX believes it has made adequate provision for
         income taxes and interest which may become payable for years not yet
         settled.

                        Pretax income (loss) included $66 million, $(75) million
         and $250 million attributable to foreign sources in 1999, 1998 and
         1997, respectively.

                        Undistributed earnings of certain consolidated foreign
         subsidiaries at December 31, 1999, amounted to $150 million. No
         provision for deferred U.S. income taxes has been made for these
         subsidiaries because the Marathon Group intends to permanently reinvest
         such earnings in those foreign operations. If such earnings were not
         permanently reinvested, a deferred tax liability of $53 million would
         have been required.

M-16


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

19. Investments and Long-Term Receivables




                    (In millions)                                                       December 31      1999         1998
                    -------------------------------------------------------------------------------------------------------
                                                                                                               
                    Equity method investments                                                           $  658       $  498
                    Other investments                                                                       32           33
                    Receivables due after one year                                                          56           46
                    Deposits of restricted cash                                                             20           21
                    Other                                                                                    6            5
                                                                                                        ------       ------
                      Total                                                                             $  772       $  603
                    -------------------------------------------------------------------------------------------------------


             Summarized financial information of affiliates accounted for by the
           equity method of accounting follows:



                    (In millions)                                                            1999        1998         1997
                    -------------------------------------------------------------------------------------------------------
                                                                                                            
                    Income data - year:
                     Revenues                                                               $  422      $  347       $ 562
                     Operating income                                                          152         132         114
                     Net income                                                                119          79          52
                    -------------------------------------------------------------------------------------------------------
                    Balance sheet data - December 31:
                     Current assets                                                         $  387      $  262
                     Noncurrent assets                                                       2,606       2,233
                     Current liabilities                                                       300         243
                     Noncurrent liabilities                                                  1,066       1,254
                    -------------------------------------------------------------------------------------------------------


             Dividends and partnership distributions received from equity
           affiliates were $44 million in 1999, $23 million in 1998 and $21
           million in 1997.

             Marathon Group purchases from equity affiliates totaled $50
           million, $64 million and $37 million in 1999, 1998 and 1997,
           respectively. Marathon Group sales to USX equity affiliates were $22
           million in 1999 and 1998 and $36 million in 1997.

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

20. Inventories



                    (In millions)                                                        December 31    1999         1998
                    -------------------------------------------------------------------------------------------------------
                                                                                                               
                    Crude oil and natural gas liquids                                                   $  729       $  731
                    Refined products and merchandise                                                     1,046        1,023
                    Supplies and sundry items                                                              109          107
                                                                                                        ------       ------
                         Total (at cost)                                                                 1,884        1,861
                    Less inventory market valuation reserve                                                  -          551
                                                                                                        ------       ------
                         Net inventory carrying value                                                   $1,884       $1,310
                    -------------------------------------------------------------------------------------------------------


             Inventories of crude oil and refined products are valued by the
           LIFO method. The LIFO method accounted for 90% and 88% of total
           inventory value at December 31, 1999 and 1998, respectively. Current
           acquisition costs were estimated to exceed the above inventory values
           at December 31, 1999, by approximately $200 million.

             The inventory market valuation reserve reflects the extent that the
           recorded LIFO cost basis of crude oil and refined products
           inventories exceeds net realizable value. The reserve is decreased to
           reflect increases in market prices and inventory turnover and
           increased to reflect decreases in market prices. Changes in the
           inventory market valuation reserve result in noncash charges or
           credits to costs and expenses.
- --------------------------------------------------------------------------------
21. Stock-Based Compensation Plans and Stockholder Rights Plan

           USX Stock-Based Compensation Plans and Stockholder Rights Plan are
           discussed in Note 19, and Note 21, respectively, to the USX
           consolidated financial statements.

             The Marathon Group's actual stock-based compensation expense
           (credit) was $(4) million in 1999, $(3) million in 1998 and $20
           million in 1997. Incremental compensation expense, as determined
           under a fair value model, was not material ($.02 or less per share
           for all years presented). Therefore, pro forma net income and
           earnings per share data have been omitted.

                                                                            M-17


- --------------------------------------------------------------------------------
22. Income Per Common Share

                    The method of calculating net income per share for the
                    Marathon Stock, the Steel Stock and, prior to November 1,
                    1997, the Delhi Stock reflects the USX Board of Directors'
                    intent that the separately reported earnings and surplus of
                    the Marathon Group, the U. S. Steel Group and the Delhi
                    Group, as determined consistent with the USX Restated
                    Certificate of Incorporation, are available for payment of
                    dividends to the respective classes of stock, although
                    legally available funds and liquidation preferences of these
                    classes of stock do not necessarily correspond with these
                    amounts.

                         Basic net income per share is based on the weighted
                    average number of common shares outstanding. Diluted net
                    income per share assumes conversion of convertible
                    securities for the applicable periods outstanding and
                    assumes exercise of stock options, provided in each case,
                    the effect is not antidilutive.



                                                                    1999                     1998                  1997
                                                             -------------------    --------------------    --------------------
          Computation of Income Per Share                     Basic     Diluted      Basic      Diluted      Basic      Diluted
          -------------------------------                     -----     -------      -----      -------      -----      ------
                                                                                                      
          Net income (millions):
           Net income                                        $    654   $    654    $    310    $    310    $    456    $    456
           Dilutive effect of convertible debentures                -          -           -           -           -           3
                                                             --------   --------    --------    --------    --------    --------
              Net income assuming conversions                $    654   $    654    $    310    $    310    $    456    $    459
                                                             ========   ========    ========    ========    ========    ========
          Shares of common stock outstanding (thousands):
           Average number of common shares outstanding        309,696    309,696     292,876     292,876     288,038     288,038
           Effect of dilutive securities:
            Convertible debentures                                  -          -           -           -           -       1,936
            Stock options                                           -        314           -         559           -         546
                                                             --------   --------    --------    --------    --------    --------
              Average common shares and dilutive effect       309,696    310,010     292,876     293,435     288,038     290,520
                                                             ========   ========    ========    ========    ========    ========
          Net income per share                               $   2.11   $   2.11    $   1.06    $   1.05    $   1.59    $   1.58
                                                             ========   ========    ========    ========    ========    ========


- --------------------------------------------------------------------------------
23. Intergroup Transactions

                    Sales and purchases - Marathon Group sales to other groups
                    totaled $41 million, $21 million and $105 million in 1999,
                    1998 and 1997, respectively. Marathon Group purchases from
                    other groups totaled $17 million in 1999, $2 million in 1998
                    and $18 million in 1997. At December 31, 1999 and 1998,
                    Marathon Group receivables included $5 million and $3
                    million, respectively, related to transactions with the
                    U.S. Steel Group. These transactions were conducted under
                    terms comparable to those with unrelated parties. Since
                    October 31, 1997, transactions with the Delhi Companies are
                    third-party transactions.

                    Income taxes receivable from/payable to the U. S. Steel
                    Group -At December 31, 1999 and 1998, amounts receivable or
                    payable for income taxes were included in the balance sheet
                    as follows:



                    (In millions)                                                            December 31      1999       1998
                    ------------------------------------------------------------------------------------------------------------
                                                                                                                   
                    Current:
                     Receivables                                                                               $   1       $   2
                     Income taxes payable                                                                         97           -
                    Noncurrent:
                     Deferred credits and other liabilities                                                       97          97
                    ------------------------------------------------------------------------------------------------------------


                         These amounts have been determined in accordance with
                    the tax allocation policy described in Note 4. Amounts
                    classified as current are settled in cash in the year
                    succeeding that in which such amounts are accrued.
                    Noncurrent amounts represent estimates of intergroup tax
                    effects of certain issues for years that are still under
                    various stages of audit and administrative review. Such tax
                    effects are not settled between the groups until the audit
                    of those respective tax years is closed. The amounts
                    ultimately settled for open tax years will be different than
                    recorded noncurrent amounts based on the final resolution of
                    all of the audit issues for those years.

- --------------------------------------------------------------------------------
24. Derivative Instruments

                    The Marathon Group remains at risk for possible changes in
                    the market value of the derivative instrument; however, such
                    risk should be mitigated by price changes in the underlying
                    hedged item. The Marathon Group is also exposed to credit
                    risk in the event of nonperformance by counterparties. The
                    credit worthiness of counterparties is subject to continuing
                    review, including the use of master netting agreements to
                    the extent practical, and full performance is anticipated.

                         The following table sets forth quantitative information
                    by class of derivative instrument:

M-18




                                                                                    Recognized
                                         Fair                      Carrying           Trading     Recorded
                                         Value                      Amount            Gain or     Deferred     Aggregate
                                         Assets                     Assets          (Loss) for     Gain or     Contract
(In millions)                         (Liabilities)/(a)(b)/      (Liabilities)       the Year      (Loss)       Values/(c)
- ---------------------------------------------------------------------------------------------------------------------------
                                                                                                
December 31, 1999:
Exchange-traded commodity futures:
 Trading                                 $      -                  $       -         $      4        $     -       $      8
 Other than trading                             -                          -                -             28            344
Exchange-traded commodity options:
 Trading                                        -                          -                4              -            179
 Other than trading                            (6) /(d)/                  (6)               -            (10)         1,262
OTC commodity swaps/(e)/:
 Trading                                        -                          -                -              -              -
 Other than trading                             3  /(f)/                   3                -              2            156
OTC commodity options:
 Trading                                        -                          -                -              -              -
 Other than trading                             4  /(g)/                   4                -              5            238
                                         --------                  ---------         --------        -------       --------
   Total commodities                     $      1                  $       1         $      8        $    25       $  2,187
                                         ========                  =========         ========        =======       ========
Forward exchange contracts/(h)/:
   - receivable                          $     52                  $      52         $      -        $     -       $     51

- ---------------------------------------------------------------------------------------------------------------------------
December 31, 1998:
Exchange-traded commodity futures        $      -                  $      -                          $    (2)      $    104
Exchange-traded commodity options               3   /(d)/                 2                                3            776
OTC commodity swaps                            (2)  /(f)/                (2)                               -            243
OTC commodity options                           3   /(g)/                 3                                3            147
                                         --------                  --------                          -------       --------
   Total commodities                     $      4                  $      3                          $     4       $  1,270
                                         ========                  ========                          =======       ========
Forward exchange contracts:
   - receivable                          $     36                  $     36                          $     -       $     36


- --------------------------------------------------------------------------------
/(a)/ The fair value amounts for OTC positions are based on various indices or
      dealer quotes. The fair value amounts for currency contracts are based on
      dealer quotes of forward prices covering the remaining duration of the
      forward exchange contract. The exchange-traded futures contracts and
      certain option contracts do not have a corresponding fair value since
      changes in the market prices are settled on a daily basis.
/(b)/ The aggregate average fair value of all trading activities for the period
      ending December 31, 1999, was $3 million. Detail by class of instrument
      was not available.
/(c)/ Contract or notional amounts do not quantify risk exposure, but are used
      in the calculation of cash settlements under the contracts. The contract
      or notional amounts do not reflect the extent to which positions may
      offset one another.
/(d)/ Includes fair values as of December 31, 1999 and 1998, for assets of $11
      million and $23 million and for liabilities of $(17) million and $(20)
      million, respectively.
/(e)/ The OTC swap arrangements vary in duration with certain contracts
      extending into 2008.
/(f)/ Includes fair values as of December 31, 1999 and 1998, for assets of $8
      million and $29 million and for liabilities of $(5) million and
      $(31) million, respectively.
/(g)/ Includes fair values as of December 31, 1999 and 1998, for assets of $5
      million and for liabilities of $(1) million and $(2) million,
      respectively.
/(h)/ The forward exchange contracts relating to USX's foreign operations have
      various maturities ending in December 2000.

- --------------------------------------------------------------------------------
25. Fair Value of Financial Instruments

                    Fair value of the financial instruments disclosed herein is
                    not necessarily representative of the amount that could be
                    realized or settled, nor does the fair value amount consider
                    the tax consequences of realization or settlement. The
                    following table summarizes financial instruments, excluding
                    derivative financial instruments disclosed in Note 24, by
                    individual balance sheet account. As described in Note 4,
                    the Marathon Group's specifically attributed financial
                    instruments and the Marathon Group's portion of USX's
                    financial instruments attributed to all groups are as
                    follows:



                                                                                                1999                 1998
                                                                                          -----------------   -------------------
                                                                                          Fair     Carrying    Fair      Carrying
                    (In millions)                            December 31                  Value     Amount     Value      Amount
                    -------------------------------------------------------------------------------------------------------------
                                                                                                             
                    Financial assets:
                     Cash and cash equivalents                                            $  111     $  111    $  137      $  137
                     Receivables                                                           1,866      1,866     1,277       1,277
                     Investments and long-term receivables                                   166        109       157         101
                                                                                          ------     ------    ------      ------
                         Total financial assets                                           $2,143     $2,086    $1,571      $1,515
                    -------------------------------------------------------------------------------------------------------------
                    Financial liabilities:
                     Notes payable                                                        $    -     $    -    $  132      $  132
                     Accounts payable (including intergroup payables)                      2,756      2,756     1,940       1,940
                     Distribution payable to minority shareholder of MAP                       -          -       103         103
                     Accrued interest                                                         92         92        87          87
                     Long-term debt (including amounts due within one year)                3,443      3,353     3,797       3,515
                     Preferred stock of subsidiary                                           176        184       183         184
                                                                                          ------     ------    ------      ------
                         Total financial liabilities                                      $6,467     $6,385    $6,242      $5,961
                    -------------------------------------------------------------------------------------------------------------


                                                                            M-19


                         Fair value of financial instruments classified as
                    current assets or liabilities approximates carrying value
                    due to the short-term maturity of the instruments. Fair
                    value of investments and long-term receivables was based on
                    discounted cash flows or other specific instrument analysis.
                    Fair value of preferred stock of subsidiary was based on
                    market prices. Fair value of long-term debt instruments was
                    based on market prices where available or current borrowing
                    rates available for financings with similar terms and
                    maturities.

                         The Marathon Group's unrecognized financial instruments
                    consist of financial guarantees. It is not practicable to
                    estimate the fair value of these forms of financial
                    instrument obligations because there are no quoted market
                    prices for transactions which are similar in nature. For
                    details relating to financial guarantees, see Note 26.

- --------------------------------------------------------------------------------
26. Contingencies and Commitments

                    USX is the subject of, or party to, a number of pending or
                    threatened legal actions, contingencies and commitments
                    relating to the Marathon Group involving a variety of
                    matters, including laws and regulations relating to the
                    environment. Certain of these matters are discussed below.
                    The ultimate resolution of these contingencies could,
                    individually or in the aggregate, be material to the
                    Marathon Group financial statements. However, management
                    believes that USX will remain a viable and competitive
                    enterprise even though it is possible that these
                    contingencies could be resolved unfavorably to the Marathon
                    Group.

                    Environmental matters -
                         The Marathon Group is subject to federal, state, local
                    and foreign laws and regulations relating to the
                    environment. These laws generally provide for control of
                    pollutants released into the environment and require
                    responsible parties to undertake remediation of hazardous
                    waste disposal sites. Penalties may be imposed for
                    noncompliance. At December 31, 1999 and 1998, accrued
                    liabilities for remediation totaled $69 million and $48
                    million, respectively. It is not presently possible to
                    estimate the ultimate amount of all remediation costs that
                    might be incurred or the penalties that may be imposed.
                    Receivables for recoverable costs from certain states, under
                    programs to assist companies in cleanup efforts related to
                    underground storage tanks at retail marketing outlets, were
                    $52 million at December 31, 1999, and $41 million at
                    December 31, 1998.

                         For a number of years, the Marathon Group has made
                    substantial capital expenditures to bring existing
                    facilities into compliance with various laws relating to the
                    environment. In 1999 and 1998, such capital expenditures
                    totaled $46 million and $83 million, respectively. The
                    Marathon Group anticipates making additional such
                    expenditures in the future; however, the exact amounts and
                    timing of such expenditures are uncertain because of the
                    continuing evolution of specific regulatory requirements.

                         At December 31, 1999 and 1998, accrued liabilities for
                    platform abandonment and dismantlement totaled $152 million
                    and $141 million, respectively.

                    Guarantees -
                         Guarantees by USX and its consolidated subsidiaries of
                    the liabilities of affiliated entities of the Marathon Group
                    totaled $131 million at December 31, 1999 and 1998. As of
                    December 31, 1999, the largest guarantee for a single
                    affiliate was $131 million.

                         At December 31, 1999 and 1998, the Marathon Group's pro
                    rata share of obligations of LOOP LLC and various pipeline
                    affiliates secured by throughput and deficiency agreements
                    totaled $146 million and $164 million, respectively. Under
                    the agreements, the Marathon Group is required to advance
                    funds if the affiliates are unable to service debt. Any such
                    advances are prepayments of future transportation charges.

                    Commitments -
                         At December 31, 1999 and 1998, the Marathon Group's
                    contract commitments to acquire property, plant and
                    equipment and long-term investments totaled $485 million and
                    $624 million, respectively.

                         The Marathon Group is a party to a 15-year
                    transportation services agreement with a natural gas
                    transmission company. The contract requires the Marathon
                    Group to pay a minimum annual demand charge of approximately
                    $5 million starting in the year 2000 and concluding in the
                    year 2014. The payments are required even if the
                    transportation facility is not utilized.

M-20


Selected Quarterly Financial Data (Unaudited)




                                                                  1999                                           1998
                                         ------------------------------------------------------       ----------------------------
(In millions, except per share data)     4th Qtr.       3rd Qtr.       2nd Qtr.         1st Qtr.      4th Qtr.        3rd  Qtr.
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                    
Revenues                                 $ 7,505        $ 6,490        $ 5,481          $ 4,851       $ 5,339 /(a)/   $ 5,597 /(a)/
Income (loss) from operations                350            561            399              403          (132)            215
 Includes:
   Inventory market valuation charges
     (credits)                                 -           (136)           (66)            (349)          245              50
   Gain on ownership
     change in MAP                            (6)           (11)             -                -             -               1
Net income (loss)                            171            230            134              119           (86)             51
- -----------------------------------------------------------------------------------------------------------------------------------

Marathon Stock data:
- -------------------
Net income (loss) per share:
 Basic                                   $   .55        $   .74        $   .43          $   .38       $  (.29)        $   .18
 Diluted                                     .55            .74            .43              .38          (.29)            .17
Dividends paid per share                     .21            .21            .21              .21           .21             .21
Price range of Marathon
 Stock/(b)/:
 - Low                                        23- 5/8        28- 1/2        25- 13/16        19- 5/8       26- 11/16       25
 - High                                       30- 5/8        33- 7/8        32- 3/4          31- 3/8       38- 1/8         37- 1/8
- -----------------------------------------------------------------------------------------------------------------------------------


                                                               1998
                                                   --------------------------------
(In millions, except per share data)               2nd Qtr.           1st Qtr.

Revenues                                           $ 5,530 /(a)/      $ 5,511 /(a)/
Income (loss) from operations                          453                402
 Includes:
   Inventory market valuation charges
     (credits)                                          (3)               (25)
   Gain on ownership
     change in MAP                                       2               (248)
Net income (loss)                                      162                183
- ------------------------------------------------------------------------------------

Marathon Stock data:
- -------------------
Net income (loss) per share:
 Basic                                             $   .56            $   .63
 Diluted                                               .56                .63
Dividends paid per share                               .21                .21
Price range of Marathon
 Stock/(b)/:
 - Low                                                  32- 3/16           31
 - High                                                 38- 7/8            40- 1/2
- ------------------------------------------------------------------------------------


/(a)/ Reclassified to conform to 1999 classifications.
/(b)/ Composite tape.


Principal Unconsolidated Affiliates (Unaudited)



                                                                           December 31, 1999
Company                                              Country                  Ownership                Activity
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                          
CLAM Petroleum B.V.                                Netherlands                   50%               Oil & Gas Production
Kenai LNG Corporation                              United States                 30%               Natural Gas Liquification
LOCAP, Inc.                                        United States                 50%  /(a)/        Pipeline & Storage Facilities
LOOP LLC                                           United States                 47%  /(a)/        Offshore Oil Port
Manta Ray Offshore Gathering Company, LLC          United States                 24%               Natural Gas Transmission
Minnesota Pipe Line Company                        United States                 33%  /(a)/        Pipeline Facility
Nautilus Pipeline Company, LLC                     United States                 24%               Natural Gas Transmission
Odyssey Pipeline LLC                               United States                 29%               Pipeline Facility
Poseidon Oil Pipeline Company, LLC                 United States                 28%               Crude Oil Transportation
Sakhalin Energy Investment Company Ltd.            Russia                        38%               Oil & Gas Development
- -----------------------------------------------------------------------------------------------------------------------------------


/(a)/ Represents the ownership of MAP.

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

See the USX consolidated financial statements for Supplementary Information on
Oil and Gas Producing Activities relating to the Marathon Group, pages U-30
through U-34.

                                                                            M-21