EXHIBIT 99.2 

- --------------------------
           Marathon Group
- --------------------------


           Index to Financial Statements, Supplementary Data,
           Management's Discussion and Analysis and Quantitative and 
           Qualitative Disclosures About Market Risk
 
 
                                                                           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

            Five-Year Operating Summary..................................  M-22

            Five-Year Financial Summary..................................  M-24

            Management's Discussion and Analysis.........................  M-25

            Quantitative and Qualitative Disclosures About Market Risks..  M-35

 
             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 generally accepted accounting principles.
             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, 1997
             and 1996, and the results of its operations and its cash flows for
             each of the three years in the period ended December 31, 1997, in
             conformity with generally accepted accounting principles. 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 generally accepted auditing standards
             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.

                As discussed in Note 7, page M-9, in 1995 USX adopted a new
             accounting standard for the impairment of long-lived assets.

                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.



             Price Waterhouse LLP
             600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
             February 10, 1998

                                                                             M-1

 
             Statement of Operations



             (Dollars in millions)                                          1997        1996      1995
             ------------------------------------------------------------------------------------------- 
                                                                                        
             REVENUES:
              Sales (Note 5)                                              $15,668     $16,297   $13,871
              Dividend and affiliate income                                    36          33        23
              Gain on disposal of assets                                       37          55         8
              Other income                                                     13           9        11
                                                                          --------    --------  -------- 
                 Total revenues                                            15,754      16,394    13,913
                                                                          --------    --------  -------- 
             COSTS AND EXPENSES:
              Cost of sales (excludes items shown below)                   10,392      11,188     9,011
              Selling, general and administrative expenses                    355         309       297
              Depreciation, depletion and amortization                        664         693       817
              Taxes other than income taxes                                 2,938       2,971     2,903
              Exploration expenses                                            189         146       149
              Inventory market valuation charges (credits) (Note 20)          284        (209)      (70)
              Impairment of long-lived assets (Note 7)                        --          --        659
                                                                          --------    --------  -------- 
                 Total costs and expenses                                  14,822      15,098    13,766
                                                                          --------    --------  -------- 
             INCOME FROM OPERATIONS                                           932       1,296       147
             Net interest and other financial costs (Note 6)                  260         305       337
                                                                          --------    --------  -------- 
             INCOME (LOSS) BEFORE INCOME TAXES AND EXTRAORDINARY LOSS         672         991      (190)
             Provision (credit) for estimated income taxes (Note 18)          216         320      (107)
                                                                          --------    --------  -------- 
             INCOME (LOSS) BEFORE EXTRAORDINARY LOSS                          456         671       (83)
             Extraordinary loss (Note 8)                                      --            7         5
                                                                          --------    --------  -------- 
             NET INCOME (LOSS)                                                456         664       (88)
             Dividends on preferred stock                                     --          --          4
                                                                          --------    --------  -------- 
             NET INCOME (LOSS) APPLICABLE TO MARATHON STOCK               $   456     $   664   $   (92)
             -------------------------------------------------------------------------------------------
  
             Income Per Common Share Applicable to Marathon Stock

 
 
                                                                             1997        1996      1995
             -------------------------------------------------------------------------------------------
                                                                                        
             BASIC:
              Income (loss) before extraordinary loss                     $  1.59     $  2.33   $  (.31)
              Extraordinary loss                                              -          (.02)     (.02)
                                                                          -------     --------  --------
              Net income (loss)                                           $  1.59     $  2.31   $  (.33)
             DILUTED:
              Income (loss) before extraordinary loss                     $  1.58     $  2.31   $  (.31)
              Extraordinary loss                                              -          (.02)     (.02)
                                                                          -------     --------  --------
              Net income (loss)                                           $  1.58     $  2.29   $  (.33)
              ------------------------------------------------------------------------------------------

             See Note 24, 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          1997         1996
             ----------------------------------------------------------------------------------------------- 
                                                                                          
             ASSETS
             Current assets:
              Cash and cash equivalents                                              $    36      $    32
              Receivables, less allowance for doubtful accounts
               of $2 and $2 (Note 23)                                                    856          613
              Inventories (Note 20)                                                      980        1,282
              Other current assets                                                       146          119
                                                                                     -------      -------
                 Total current assets                                                  2,018        2,046
 
             Investments and long-term receivables (Note 19)                             455          311
             Property, plant and equipment - net (Note 17)                             7,566        7,298
             Prepaid pensions (Note 15)                                                  290          280
             Other noncurrent assets                                                     236          216
                                                                                     -------      -------
                 Total assets                                                        $10,565      $10,151
             --------------------------------------------------------------------------------------------
             LIABILITIES
             Current liabilities:
              Notes payable                                                          $   108      $    59
              Accounts payable                                                         1,348        1,385
              Payroll and benefits payable                                               142          106
              Accrued taxes                                                              102           98
              Deferred income taxes (Note 18)                                             61          155
              Accrued interest                                                            84           75
              Long-term debt due within one year (Note 11)                               417          264
                                                                                     -------      -------
                 Total current liabilities                                             2,262        2,142
             Long-term debt (Note 11)                                                  2,476        2,642
             Long-term deferred income taxes (Note 18)                                 1,318        1,178
             Employee benefits (Note 16)                                                 375          356
             Deferred credits and other liabilities                                      332          311
 
             Preferred stock of subsidiary (Note 9)                                      184          182
 
             STOCKHOLDERS' EQUITY (Note 22)                                            3,618        3,340
                                                                                     -------      -------
                 Total liabilities and stockholders' equity                          $10,565      $10,151
             --------------------------------------------------------------------------------------------


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

                                                                             M-3

 
Statement of Cash Flows



(Dollars in millions)                                              1997         1996         1995
- ------------------------------------------------------------------------------------------------- 
                                                                                   
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS

OPERATING ACTIVITIES:
Net income (loss)                                               $   456       $  664       $  (88)
Adjustments to reconcile to net cash provided
 from operating activities:
  Extraordinary loss                                                 -             7            5
  Depreciation, depletion and amortization                          664          693          817
  Exploratory dry well costs                                         78           54           64
  Inventory market valuation charges (credits)                      284         (209)         (70)
  Pensions                                                           (4)          (3)         (16)
  Postretirement benefits other than pensions                        10           15           12
  Deferred income taxes                                              30          104         (204)
  Gain on disposal of assets                                        (37)         (55)          (8)
  Payment of amortized discount on zero coupon debentures           (13)          -           (96)
  Impairment of long-lived assets                                    -            -           659
  Changes in: Current receivables - sold                           (340)          -             8
                                  - operating turnover               97         (119)        (120)
     Inventories                                                     18           72           55
     Current accounts payable and accrued expenses                   11          211          (27)
  All other - net                                                    (8)          69           53
                                                                -------       ------       ------
    Net cash provided from operating activities                   1,246        1,503        1,044
                                                                -------       ------       ------
INVESTING ACTIVITIES:
Capital expenditures                                             (1,038)        (751)        (642)
Disposal of assets                                                   60          282           77
Elimination of Retained Interest in Delhi Group                      -            -            58
Withdrawal (deposit) - property exchange trusts                      98          (98)         -
Investments in equity affiliates                                   (233)         (13)          (4)
                                                                -------       ------       ------
    Net cash used in investing activities                        (1,113)        (580)        (511)
                                                                -------       ------       ------
FINANCING ACTIVITIES (Note 4):
Increase (decrease) in Marathon Group's portion of
 USX consolidated debt                                               97         (769)        (204)
Specifically attributed debt - repayments                           (39)          (1)          (2)
Preferred stock redeemed                                             -            -           (78)
Marathon Stock repurchased                                           -            -            (1)
Marathon Stock issued                                                34            2          -
Dividends paid                                                     (219)        (201)        (199)
                                                                -------       ------       ------
    Net cash used in financing activities                          (127)        (969)        (484)
                                                                -------       ------       ------
EFFECT OF EXCHANGE RATE CHANGES ON CASH                              (2)           1          -
                                                                -------       ------       ------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                  4          (45)          49

CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                       32           77           28
                                                                -------       ------       ------
CASH AND CASH EQUIVALENTS AT END OF YEAR                        $    36       $   32       $   77
- --------------------------------------------------------------------------------------------------


See Note 12, 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 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 is involved in
             worldwide exploration, production, transportation and marketing of
             crude oil and natural gas; domestic refining, marketing and
             transportation of petroleum products; and power generation. The
             Marathon Group financial statements are prepared using the amounts
             included in the USX consolidated financial statements.

                Although the financial statements of the Marathon Group and the
             U. S. Steel Group separately report the assets, liabilities
             (including contingent liabilities) and stockholders' equity of USX
             attributed to each such group, such attribution of assets,
             liabilities (including contingent liabilities) and stockholders'
             equity among the Marathon Group and the U. S. Steel Group for the
             purpose of preparing their respective financial statements does not
             affect legal title to such assets or responsibility for such
             liabilities. Holders of Marathon Stock and Steel Stock are holders
             of common stock of USX and continue to be subject to all the risks
             associated with an investment in USX and all of its businesses and
             liabilities. Financial impacts arising from one Group that affect
             the overall cost of USX's capital could affect the results of
             operations and financial condition of the other Group. In addition,
             net losses of either Group, as well as dividends and distributions
             on any class of USX Common Stock or series of preferred stock and
             repurchases of any class of USX Common Stock or series of preferred
             stock at prices in excess of par or stated value, will reduce the
             funds of USX legally available for payment of dividends on both
             classes of Common Stock. Accordingly, the USX consolidated
             financial information should be read in connection with the
             Marathon Group financial information.

- --------------------------------------------------------------------------------
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 other 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 advances. The proportionate share of income from these
             equity method investments is included in revenues.

                Investments in other companies whose stock is publicly traded
             are carried at market value. The difference between the cost of
             these investments and market value is recorded as a direct
             adjustment to stockholders' equity (net of tax). Investments in
             companies whose stock has no readily determinable fair value are
             carried at cost. Dividends from these investments are recognized in
             revenues.

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

                The proportionate share of income represented by the Retained
             Interest (Note 4) in the Delhi Group prior to June 15, 1995, is
             included in revenues. In November 1997, USX sold its stock in Delhi
             Gas Pipeline Corporation and other subsidiaries of USX that
             comprise all of the Delhi Group (Delhi Companies).

             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.

             CASH AND CASH EQUIVALENTS - Cash and cash equivalents include
             cash on hand and on deposit and 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.

                                                                             M-5

 
             DERIVATIVE INSTRUMENTS - The Marathon Group engages in commodity
             and currency risk management activities within the normal course of
             its business as an end-user of derivative instruments (Note 25).
             Management is authorized to manage exposure to price fluctuations
             related to the purchase, production or sale of crude oil, natural
             gas, refined products and electricity through the use of a variety
             of derivative financial and nonfinancial instruments. Derivative
             financial instruments require settlement in cash and include such
             instruments as over-the-counter (OTC) commodity swap agreements and
             OTC commodity options. Derivative nonfinancial instruments require
             or permit settlement by delivery of commodities and include
             exchange-traded commodity futures contracts and options. At times,
             derivative positions are closed, prior to maturity, simultaneous
             with the underlying physical transaction and the effects are
             recognized in income accordingly. The Marathon Group's practice
             does not permit derivative positions to remain open if the
             underlying physical market risk has been removed. Derivative
             instruments relating to fixed price sales of equity production are
             marked-to-market in the current period and the related income
             effects are included within income from operations. All other
             changes in the market value of derivative instruments are deferred,
             including both closed and open positions, and are subsequently
             recognized in income, as sales or cost of sales, in the same period
             as the underlying transaction. Premiums on all commodity-based
             option contracts are initially recorded based on the amount paid or
             received; the options' market value is subsequently recorded as a
             receivable or payable, as appropriate. The margin receivable
             accounts required for open commodity contracts reflect changes in
             the market prices of the underlying commodity and are settled on a
             daily basis.

                Forward currency contracts are used to manage currency risks
             related to anticipated revenues and operating costs, firm
             commitments for capital expenditures and existing assets or
             liabilities denominated in a foreign currency. Gains or losses
             related to firm commitments are deferred and included 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. Net contract
             values are included in receivables or payables, as appropriate.

                Recorded deferred gains or losses are reflected within other
             noncurrent assets or deferred credits and other liabilities. Cash
             flows from the use of derivative instruments are reported in the
             same category as the hedged item in the statement of cash flows.

             EXPLORATION AND DEVELOPMENT - The Marathon Group follows the
             successful efforts method of accounting for oil and gas exploration
             and development.

             GAS BALANCING - The Marathon Group follows the sales method of
             accounting for gas production imbalances.

             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.

                When an entire property, major facility or facilities
             depreciated on an individual basis are sold or otherwise disposed
             of, any gain or loss is reflected in income. Proceeds from disposal
             of other facilities depreciated on a group basis are credited to
             the depreciation reserve with no immediate effect on income.

                The Marathon Group evaluates impairment of its oil and gas
             assets primarily on a field-by-field basis. 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
             could be 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 1997 classifications.

M-6

 
- --------------------------------------------------------------------------------
3. NEW ACCOUNTING STANDARDS

             The following accounting standards were adopted by USX during
             1997:

                Environmental remediation liabilities - 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.

                Earnings per share  USX adopted Statement of Financial
                Accounting Standards No. 128, "Earnings per Share" (SFAS No.
                128). This Statement establishes standards for computing and
                presenting earnings per share (EPS). SFAS No. 128 requires dual
                presentation of basic and diluted EPS. Basic EPS excludes
                dilution and is computed by dividing net income available to
                common stockholders by the weighted average number of common
                shares outstanding for the period. Diluted EPS reflects the
                potential dilution that could occur if stock options or
                convertible securities were exercised or converted into common
                stock. The adoption of SFAS No. 128 did not materially change
                current and prior years' EPS of the Marathon Group.

- --------------------------------------------------------------------------------
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 $37 million in 1997 and $30
             million in 1996 and 1995, and primarily consist of employment costs
             including pension effects, professional services, facilities and
             other related costs associated with corporate activities.

             COMMON STOCK TRANSACTIONS - The USX Board of Directors, prior to
             June 15, 1995, had designated 14,003,205 shares of USX - Delhi
             Group Common Stock (Delhi Stock) to represent 100% of the common
             stockholders' equity value of USX attributable to the Delhi Group.
             The Delhi Fraction was the percentage interest in the Delhi Group
             represented by the shares of Delhi Stock that were outstanding at
             any particular time and, based on 9,438,391 outstanding shares at
             June 14, 1995, was approximately 67%. The Marathon Group financial
             statements reflected a percentage interest in the Delhi Group of
             approximately 33% (Retained Interest) through June 14, 1995. The
             financial position, results of operations and cash flows of the
             Delhi Group were reflected in the financial statements of the
             Marathon Group only to the extent of the Retained Interest. The
             shares deemed to represent the Retained Interest were not
             outstanding shares of Delhi Stock and could not be voted by the
             Marathon Group. As additional shares of Delhi Stock deemed to
             represent the Retained Interest were sold, the Retained Interest
             decreased. When a dividend was paid in respect to the outstanding
             Delhi Stock, the Marathon Group financial statements were credited,
             and the Delhi Group financial statements were charged, with the
             aggregate transaction amount times the quotient of the Retained
             Interest divided by the Delhi Fraction.

                On June 15, 1995, USX eliminated the Marathon Group's Retained
             Interest in the Delhi Group (equivalent to 4,564,814 shares of
             Delhi Stock). This was accomplished through a reallocation of
             assets and a corresponding adjustment to debt and equity attributed
             to the Marathon and Delhi Groups. The reallocation was made at a
             price of $12.75 per equivalent share of Delhi Stock, or an
             aggregate of $58 million, resulting in a corresponding reduction of
             the Marathon Group debt.

                                                                             M-7

 
             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. REVENUES

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

 
 
             (In millions)                                                                            1997     1996     1995
             ----------------------------------------------------------------------------------------------------------------- 
                                                                                                              
             Consumer excise taxes on petroleum products and merchandise                            $2,736   $2,768   $2,708
             Matching crude oil and refined product
               buy/sell transactions settled in cash                                                 2,436    2,912    2,067
             ----------------------------------------------------------------------------------------------------------------- 
 

- -------------------------------------------------------------------------------
6. OTHER ITEMS

 
 
             (In millions)                                                                            1997     1996     1995
             ----------------------------------------------------------------------------------------------------------------- 
                                                                                                              
               NET INTEREST AND OTHER FINANCIAL COSTS
               INTEREST AND OTHER FINANCIAL INCOME/(a)/:
                 Interest income                                                                    $    7   $    4   $    9
                 Other                                                                                  (6)      (1)       3
                                                                                                    ------   ------   ------
                   Total                                                                                 1        3       12
                                                                                                    ------   ------   ------
               INTEREST AND OTHER FINANCIAL COSTS/(a)/:
                 Interest incurred                                                                     232      260      297
                 Less interest capitalized                                                              24        3        8
                                                                                                    ------   ------   ------
                   Net interest                                                                        208      257      289
                 Interest on tax issues                                                                  7        4       (5) /(b)/
                 Financial costs on preferred stock of subsidiary                                       16       16       16
                 Amortization of discounts                                                               4        7       21
                 Expenses on sales of accounts receivable (Note 23)                                     19       20       24
                 Other                                                                                   7        4        4
                                                                                                    ------   ------   ------
                   Total                                                                               261      308      349
                                                                                                    ------   ------   ------
               NET INTEREST AND OTHER FINANCIAL COSTS/(a)/                                          $  260   $  305   $  337
               ----------------------------------------------------------------------------------------------------------------- 

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

               /(b)/ Includes a $17 million benefit related to refundable
                     federal income taxes paid in prior years.
               ----------------------------------------------------------------
               FOREIGN CURRENCY TRANSACTIONS

               For 1997, 1996 and 1995, the aggregate foreign currency
               transaction gains (losses) included in determining net income
               were $4 million, $(24) million and $3 million, respectively.

M-8

 
- -------------------------------------------------------------------------------
7. IMPAIRMENT OF LONG-LIVED ASSETS

             In 1995, USX adopted Statement of Financial Accounting Standards
             No. 121, "Accounting for the Impairment of Long-Lived Assets and
             for Long-Lived Assets to Be Disposed Of" (SFAS No. 121). SFAS No.
             121 requires that long-lived assets, including related goodwill, be
             reviewed for impairment and written down to fair value whenever
             events or changes in circumstances indicate that the carrying value
             may not be recoverable.

                 Adoption of SFAS No. 121 resulted in an impairment charge
             included in 1995 costs and expenses of $659 million. The impaired
             assets primarily included certain domestic and international oil
             and gas properties, an idled refinery and related goodwill.

                 The Marathon Group assessed impairment of its oil and gas
             properties based primarily on a field-by-field approach. The
             predominant method used to determine fair value was a discounted
             cash flow approach and where available, comparable market values
             were used. The impairment provision reduced capitalized costs of
             oil and gas properties by $533 million.

                 In addition, the Indianapolis, Indiana refinery, which
             was temporarily idled in October 1993, was impaired by $126
             million, including related goodwill. The impairment was based on a
             discounted cash flow approach and comparable market values.

- -------------------------------------------------------------------------------
8. EXTRAORDINARY LOSS

             On December 30, 1996, USX irrevocably called for redemption on
             January 30, 1997, $120 million of debt, resulting in a 1996
             extraordinary loss to the Marathon Group of $7 million, net of a $4
             million income tax benefit. In 1995, USX extinguished $553 million
             of debt prior to maturity, which resulted in an extraordinary loss
             to the Marathon Group of $5 million, net of a $3 million income tax
             benefit.

- -------------------------------------------------------------------------------
9. FINANCIAL ACTIVITIES ATTRIBUTED TO GROUPS

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



                                                                                   Marathon Group          Consolidated USX/(a)/
                                                                               -----------------------   -----------------------
             (In millions)                              December 31                1997        1996            1997       1996
             -------------------------------------------------------------------------------------------------------------------
                                                                                                            
 
             Cash and cash equivalents                                           $    5      $    6         $    6      $    8
             Receivables/(b)/                                                         9          -              10          -
             Long-term receivables/(b)/                                               -          12             -           16
             Other noncurrent assets/(b)/                                             7           5              8           8
                                                                                 ------      ------         ------  ----------
                 Total assets                                                    $   21      $   23         $   24      $   32
             -----------------------------------------------------------------------------------------------------------------
             Notes payable                                                       $  108      $   58         $  121      $   80
             Accounts payable                                                         1           2              1           2
             Accrued interest                                                        79          71             89          98
             Long-term debt due within one year (Note 11)                           416         224            466         309
             Long-term debt (Note 11)                                             2,452       2,618          2,704       3,615
             Preferred stock of subsidiary                                          184         182            250         250
                                                                                 ------      ------         ------  ----------
                 Total liabilities                                               $3,240      $3,155  $       3,631      $4,354
             -----------------------------------------------------------------------------------------------------------------
 

 
 
                                                                      Marathon Group/(c)/          Consolidated USX
                                                                    -----------------------     ----------------------
             (In millions)                                           1997      1996    1995      1997    1996    1995
            ---------------------------------------------------------------------------------------------------------- 
                                                                                               
             Net interest and other financial
               costs (Note 6)                                       $ 246    $  277   $ 329     $ 309  $  376   $ 439
            ----------------------------------------------------------------------------------------------------------


            /(a)/  For details of USX long-term debt and preferred stock of
                   subsidiary, see Notes 16 and 25, respectively, to the USX
                   consolidated financial statements.
            /(b)/  Primarily reflects forward currency contracts used to manage
                   currency risks related to USX debt and interest denominated
                   in a foreign currency.
            /(c)/  The Marathon Group's net interest and other financial costs
                   reflect weighted average effects of all financial activities
                   attributed to all groups.

                                                                             M-9

 
- -------------------------------------------------------------------------------
10. LEASES

             Future minimum commitments for capital leases and for operating
             leases having remaining noncancelable lease terms in excess of one
             year are as follows:



                                                               Capital    Operating
             (In millions)                                     Leases       Leases
             -----------------------------------------------------------------------
                                                                    
 
              1998                                            $  2        $ 106           
              1999                                               2           80           
              2000                                               2          157           
              2001                                               2           57           
              2002                                               2           55           
              Later years                                       27          140           
              Sublease rentals                                  -           (29)          
                                                              -----   ---------           
               Total minimum lease payments                     37        $ 566           
                                                                      =========           
              Less imputed interest costs                       13                        
                                                              -----                       
               Present value of net minimum lease payments                                
                included in long-term debt                    $ 24                         
         ---------------------------------------------------------------------------------------
 
               Operating lease rental expense:

 
 
             (In millions)                                1997         1996        1995
          ---------------------------------------------------------------------------------------
                                                                          
          Minimum rental                                 $ 102        $  96       $  97
          Contingent rental                                 10           10          10
          Sublease rentals                                  (7)          (6)         (5)
                                                          -----        -----   ---------
             Net rental expense                          $ 105        $ 100       $ 102
          ---------------------------------------------------------------------------------------


                 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 $109 million
             may be declared immediately due and payable.

- --------------------------------------------------------------------------------
11. 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             1997              1996    1997            1996
             ----------------------------------------------------------------------------------------------------
                                                                                                   
              Specifically attributed debt/(b)/:
              Sale-leaseback financing and capital leases            $   24      $   24      $  123      $  129
              Indexed debt less unamortized discount                    -          -            110         119
              Seller-provided financing                                 -            40         -            40
                                                                     ------      ------      ------  ----------
                 Total                                                   24          64         233         288
              Less amount due within one year                           -            40           5          44
                                                                     ------      ------      ------  ----------
                 Total specifically attributed long-term debt        $   24      $   24      $  228      $  244
             --------------------------------------------------------------------------------------------------
             Debt attributed to groups/(c)/                          $2,889      $2,860      $3,194      $3,949
              Less unamortized discount                                  21          18          24          25
              Less amount due within one year                           416         224         466         309
                                                                     ------      ------      ------  ----------
                 Total long-term debt attributed to groups           $2,452      $2,618      $2,704      $3,615
             --------------------------------------------------------------------------------------------------
             Total long-term debt due within one year                $  416      $  264      $  471      $  353
             Total long-term debt due after one year                  2,476       2,642       2,932       3,859
             --------------------------------------------------------------------------------------------------


             /(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 12).

M-10

 
- -------------------------------------------------------------------------------
12. SUPPLEMENTAL CASH FLOW INFORMATION

 
 
            (In millions)                                                                  1997      1996       1995
            ----------------------------------------------------------------------------------------------------------  
                                                                                                     
             CASH USED IN OPERATING ACTIVITIES INCLUDED:
              Interest and other financial costs paid (net of amount capitalized)     $   (257)   $  (339)    $  (431)
              Income taxes paid, including settlements with other groups                  (178)       (74)       (163)
            ----------------------------------------------------------------------------------------------------------   
             USX DEBT ATTRIBUTED TO ALL GROUPS - NET:
              Commercial paper:
               Issued                                                                 $    -      $ 1,422     $ 2,434
               Repayments                                                                  -       (1,555)     (2,651)
              Credit agreements:
               Borrowings                                                               10,454     10,356       4,719
               Repayments                                                              (10,449)   (10,340)     (4,659)
              Other credit arrangements - net                                               36        (36)         40
              Other debt:
               Borrowings                                                                   10         78          52
               Repayments                                                                 (741)      (705)       (440)
                                                                                      --------   --------     -------
                 Total                                                                $   (690)  $   (780)    $  (505)
              -------------------------------------------------------------------------------------------------------- 
              Marathon Group activity                                                 $     97   $   (769)    $  (204)
              U. S. Steel Group activity                                                  (561)       (31)       (399)
              Delhi Group activity                                                        (226)        20          98
                                                                                      --------   --------     -------
                 Total                                                                $   (690)  $   (780)    $  (505)
              --------------------------------------------------------------------------------------------------------
             NONCASH INVESTING AND FINANCING ACTIVITIES:
              Marathon Stock issued for employee stock plans                          $      5   $      2     $     5
              Disposal of assets - common stock received                                    -          -            5
                                 - liabilities assumed by buyers                             5         25          -
            ----------------------------------------------------------------------------------------------------------  


- -------------------------------------------------------------------------------
13. DIVIDENDS

             In accordance with the USX 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 operation 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.

- --------------------------------------------------------------------------------
14. STOCK-BASED COMPENSATION PLANS AND STOCKHOLDER RIGHTS PLAN

             USX Stock-Based Compensation Plans and Stockholder Rights Plan
             are discussed in Note 21, and Note 23, respectively, to the USX
             consolidated financial statements.

                 In 1996, USX adopted SFAS No. 123, Accounting for Stock-
             Based Compensation and elected to continue to follow the accounting
             provisions of APB No. 25, as discussed in Note 2, to the USX
             consolidated financial statements. The Marathon Group's actual
             stock-based compensation expense was $20 million in 1997, $6
             million in 1996 and $2 million in 1995. Incremental compensation
             expense, as determined under SFAS No. 123, was not material ($.02
             or less per share for all years presented). Therefore, pro forma
             net income and earnings per share data have been omitted.

                                                                            M-11


- --------------------------------------------------------------------------------
15. PENSIONS
 
             The Marathon Group has noncontributory defined benefit plans
             covering substantially all employees. Benefits under these plans
             are based primarily upon years of service and the highest three
             years earnings during the last ten years before retirement. Certain
             subsidiaries provide benefits for employees covered by other plans
             based primarily upon employees' service and career earnings. The
             funding policy for all plans provides that payments to the pension
             trusts shall be equal to the minimum funding requirements of ERISA
             plus such additional amounts as may be approved.

             PENSION COST (CREDIT) - The defined benefit cost for major plans
             for 1997, 1996 and 1995 was determined assuming an expected long-
             term rate of return on plan assets of 9.5%, 10% and 10%,
             respectively, and was as follows:



             (In millions)                                                1997      1996     1995
             --------------------------------------------------------------------------------------
                                                                                   
             Major plans:                                               
              Cost of benefits earned during the period                 $    31   $    35   $    26
              Interest cost on projected benefit obligation             
               (7.5% for 1997; 7% for 1996; and 8% for 1995)                 45        45        41   
              Return on assets - actual return                             (217)     (139)     (197) 
                               - deferred gain                              132        55       116  
              Net amortization of unrecognized gains                         (3)       (3)       (4) 
                                                                        -------   -------   -------   
                 Total major plans                                          (12)       (7)      (18) 
             Other plans                                                      4         4         4  
                                                                        -------   -------   -------   
                 Total periodic pension credit                               (8)       (3)      (14) 
             Curtailment losses                                               -         -         2  
                                                                        -------   -------   -------   
                 Total pension credit                                   $    (8)  $    (3)  $   (12)  
             --------------------------------------------------------------------------------------


             FUNDS' STATUS - The assumed discount rate used to measure the
             benefit obligations of major plans was 7% at December 31, 1997, and
             7.5% at December 31, 1996. The assumed rate of future increases in
             compensation levels was 5% at both year-ends. The following table
             sets forth the plans' funded status and the amounts reported in the
             Marathon Group's balance sheet:



             (In millions)                                         December 31        1997          1996
             -------------------------------------------------------------------------------------------
                                                                                        
             Reconciliation of funds' status to reported amounts:     
             Projected benefit obligation (PBO)/(a)/                               $   (771)     $   (627)
             Plan assets at fair market value/(b)/                                    1,150           989
                                                                                   --------      -------- 
                      Assets in excess of PBO/(c)/                                      379           362
             Unrecognized net gain from transition                                      (40)          (45)
             Unrecognized prior service cost                                             45             8
             Unrecognized net gain                                                     (115)          (65)
             Additional minimum liability/(d)/                                          (14)          (11)
                                                                                   --------      -------- 
                      Net pension asset included in balance sheet                  $    255      $    249
             --------------------------------------------------------------------------------------------
             /(a)/  PBO includes:
                      Accumulated benefit obligation (ABO)                         $   (562)     $   (479)
                      Vested benefit obligation                                        (496)         (424) 
             /(b)/  Types of assets held:
                      Stocks of other corporations                                       70%           70%
                      U.S. Government securities                                          9%           10%
                      Corporate debt instruments and other                               21%           20%
             /(c)/  Includes several small plans that have ABOs in excess of
                    plan assets:
                      PBO                                                          $    (82)     $    (68)
                      Plan assets                                                        24            18
                                                                                   --------      --------
                       PBO in excess of plan assets                                $    (58)     $    (50)
             /(d)/  Additional minimum liability recorded was offset by the
                    following:
                      Intangible asset                                             $      3      $      3
                      Stockholders' equity adjustment - net of deferred income tax        7             5
             --------------------------------------------------------------------------------------------   


M-12

 
- --------------------------------------------------------------------------------
16. POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

             The Marathon Group has defined benefit retiree health and life
             insurance plans covering most employees upon their retirement.
             Health benefits are provided, for the most part, through
             comprehensive hospital, surgical and major medical benefit
             provisions subject to various cost sharing features. Life insurance
             benefits are provided to nonunion and most union represented
             retiree beneficiaries primarily based on employees' annual base
             salary at retirement. Benefits have not been prefunded.

             POSTRETIREMENT BENEFIT COST - Postretirement benefit cost for
             defined benefit plans for 1997, 1996 and 1995 was determined
             assuming discount rates of 7.5%, 7% and 8%, respectively, and was
             as follows:



             (In millions)                                                       1997    1996    1995
             -----------------------------------------------------------------------------------------
                                                                                        
 
             Cost of benefits earned during the period                           $   6   $   8   $   7
             Interest on accumulated postretirement benefit obligation (APBO)       22      23      22
             Amortization of unrecognized gains                                     (3)     (3)     (3)
                                                                                 -----   -----   -----
                 Total postretirement benefit cost                               $  25   $  28   $  26
             ----------------------------------------------------------------------------------------- 


             OBLIGATIONS - The following table sets forth the plans' obligations
             and the amounts reported in the Marathon Group's balance sheet:



             (In millions)                                 December 31            1997        1996
             -------------------------------------------------------------------------------------           
                                                                                           
             Reconciliation of APBO to reported amounts:
             APBO attributable to:
              Retirees                                                           $ 196       $ 162
              Fully eligible plan participants                                      72          53
              Other active plan participants                                       113          84
                                                                                 -----       -----
                 Total APBO                                                        381         299
             Unrecognized net loss                                                 (73)         (4)
             Unrecognized prior service cost                                        18          21
                                                                                 -----       -----
                 Accrued liability included in balance sheet                     $ 326       $ 316
             -------------------------------------------------------------------------------------


                The assumed discount rate used to measure the APBO was 7% and
             7.5% at December 31, 1997, and December 31, 1996, respectively. The
             assumed rate of future increases in compensation levels was 5% at
             both year-ends. The weighted average health care cost trend rate in
             1998 is approximately 8%, gradually declining to an ultimate rate
             in 2004 of approximately 5%. A one percentage point increase in the
             assumed health care cost trend rates for each future year would
             have increased the aggregate of the service and interest cost
             components of the 1997 net periodic postretirement benefit cost by
             $5 million and would have increased the APBO as of December 31,
             1997, by $56 million.
- --------------------------------------------------------------------------------
17. PROPERTY, PLANT AND EQUIPMENT

 
 
             (In millions)                                              December 31         1997         1996
             --------------------------------------------------------------------------------------------------
                                                                                                  
             Production                                                                    $13,219      $12,605
             Refining                                                                        1,703        1,633
             Marketing                                                                       1,442        1,350
             Transportation                                                                    626          515
             Other                                                                             243          226
                                                                                           -------      -------
                 Total                                                                      17,233       16,329
             Less accumulated depreciation, depletion and amortization                       9,667        9,031
                                                                                           -------      -------
                 Net                                                                       $ 7,566      $ 7,298
             --------------------------------------------------------------------------------------------------


                Property, plant and equipment includes gross assets acquired
             under capital leases of $24 million at December 31, 1997 and 1996;
             the related amounts for the years 1997 and 1996 in accumulated
             depreciation, depletion and amortization were $24 million.
                                                                                
                                                                            M-13


- --------------------------------------------------------------------------------
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:
             


                                                    1997                             1996                           1995
                                      ------------------------------    ---------------------------    ---------------------------
             (In millions)            Current     Deferred     Total    Current    Deferred   Total    Current    Deferred   Total
             ---------------------------------------------------------------------------------------------------------------------
                                                                                                  
             Federal                    $171       $  (5)       $166       $193      $  13    $ 206      $  72      $(221)   $(149)
             State and local               3           7          10         12          9       21         10        (14)      (4)
             Foreign                      12          28          40         11         82       93         15         31       46
                                        ----       -----        ----       ----      -----    -----      -----      -----    -----
                Total                   $186       $  30        $216       $216      $ 104    $ 320      $  97      $(204)   $(107)
             ---------------------------------------------------------------------------------------------------------------------
 

                 A reconciliation of federal statutory tax rate (35%) to total
                 provisions (credits) follows:
 
 
 
             (In millions)                                                              1997          1996             1995
             --------------------------------------------------------------------------------------------------------------------  
                                                                                                            
             Statutory rate applied to income (loss) before income taxes               $ 235         $ 347            $ (67)
             State and local income taxes after federal income tax effects                 6            14               (3)
             Effects of foreign operations, including foreign tax credits                 (8)          (14)             (36)/(a)/
             Effects of partially-owned companies                                         (6)          (10)              (7)
             Dispositions of subsidiary investments                                        -            (8)              (6)
             Credits other than foreign tax credits                                       (9)           (8)              (1)
             Nondeductible business and amortization expenses                              3             3               10
             Adjustment of prior years' income taxes                                      (4)           (6)              (1)
             Adjustment of valuation allowances                                           (4)            -                4
             Other                                                                         3             2                -
                                                                                       -----         -----            -----
                 Total provisions (credits)                                            $ 216         $ 320            $(107)
             --------------------------------------------------------------------------------------------------------------------
 

             /(a)/  Includes incremental tax benefits of $44 million resulting
                    from USX's election to credit, rather than deduct, certain
                    foreign income taxes for federal income tax purposes.

                 Deferred tax assets and liabilities resulted from the
                 following:



             (In millions)                                                         December 31           1997                1996
             ----------------------------------------------------------------------------------------------------------------------
                                                                                                                      
             Deferred tax assets:
               Minimum tax credit carryforwards                                                        $   42               $  110
               State tax loss carryforwards (expiring in 1998 through 2012)                                52                   40
               Foreign tax loss carryforwards (portion of which expire in 1998 through 2012)              483                  519
               Employee benefits                                                                          172                  158
               Expected federal benefit for:
                 Crediting certain foreign deferred income taxes                                          249                  216
                 Deducting state and other foreign deferred
                income taxes                                                                               53                   51
               Contingency and other accruals                                                             148                  116
               Other                                                                                       54                   56
               Valuation allowances                                                                      (311)                (325)
                                                                                                       ------               ------
                  Total deferred tax assets/(a)/                                                          942                  941
                                                                                                       ------               ------
             Deferred tax liabilities:
               Property, plant and equipment                                                            1,820                1,685
               Inventory                                                                                  199                  306
               Prepaid pensions                                                                           129                  121
               Other                                                                                      114                  118
                                                                                                       ------                -----
                  Total deferred tax liabilities                                                        2,262                2,230
                                                                                                       ------                -----
                   Net deferred tax liabilities                                                        $1,320               $1,289
             ----------------------------------------------------------------------------------------------------------------------


             /(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 1994 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 $250 million, $341 million
             and $(50) million attributable to foreign sources in 1997, 1996 and
             1995, respectively.

                       Undistributed earnings of consolidated foreign
             subsidiaries at December 31, 1997, amounted to $108 million. No
             provision for deferred U.S. income taxes has been made because the
             Marathon Group intends to permanently reinvest such earnings in its
             foreign operations. If such earnings were not permanently
             reinvested, a deferred tax liability of $38 million would have been
             required.

M-14

 
- --------------------------------------------------------------------------------
19. INVESTMENTS AND LONG-TERM RECEIVABLES

 
 
             (In millions)                           December 31       1997         1996
             ----------------------------------------------------------------------------
                                                                           
             Equity method investments                                 $ 366        $ 135
             Other investments                                            32           31
             Deposit in property exchange trusts                           -           98
             Receivables due after one year                               49           34
             Forward currency contracts                                    -           12
             Other                                                         8            1
                                                                       -----        -----
                 Total                                                 $ 455        $ 311
             ----------------------------------------------------------------------------


                    The following represents summarized financial information of
             affiliates accounted for by the equity method of accounting, except
             for the Retained Interest in the Delhi Group:



             (In millions)                         1997       1996      1995
             ---------------------------------------------------------------
                                                              
             Income data - year:
              Revenues                           $  562     $  405     $ 255
              Operating income                      114         95        77
              Net income                             52         53        24
             ---------------------------------------------------------------
             Balance sheet data - December 31:
              Current assets                     $  170     $  146
              Noncurrent assets                   1,470      1,150
              Current liabilities                   236        198
              Noncurrent liabilities                721        737
             ---------------------------------------------------------------


                    Dividends and partnership distributions received from equity
             affiliates were $21 million in 1997, $24 million in 1996 and $14
             million in 1995.

                    Marathon Group purchases from equity affiliates totaled
             $37 million, $49 million and $52 million in 1997, 1996 and 1995,
             respectively. Marathon Group sales to equity affiliates were $10
             million in 1997, $6 million in 1996 and immaterial in 1995.

                    Summarized financial information of the Delhi Group, which
             was accounted for by the equity method of accounting follows:



             (In millions)                               1995/(a)/
             ------------------------------------------------------
                                                      
             Income data for the period:
              Revenues                                    $  276
              Operating income                                14
              Net income                                       7
              -----------------------------------------------------


             /(a)/ Retained Interest in the Delhi Group was eliminated on June
                   15, 1995.
 
20. INVENTORIES

 
 
             (In millions)                               December 31      1997         1996
             -------------------------------------------------------------------------------  
                                                                              
             Crude oil and natural gas liquids                            $  452       $  463
             Refined products and merchandise                                735          746
             Supplies and sundry items                                        77           73
                                                                          ------       ------
                 Total (at cost)                                           1,264        1,282
             Less inventory market valuation reserve                         284            -
                                                                          ------       ------
                 Net inventory carrying value                             $  980       $1,282
             --------------------------------------------------------------------------------
 

                    Inventories of crude oil and refined products are valued by
             the LIFO method. The LIFO method accounted for 91% and 94% of total
             inventory value at December 31, 1997, and December 31, 1996,
             respectively.

                    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. 

                                                                            M-15

 
- --------------------------------------------------------------------------------
21. INTERGROUP TRANSACTIONS
                         
          SALES AND PURCHASES - Marathon Group sales to other groups totaled
          $105 million, $87 million and $54 million in 1997, 1996 and 1995,
          respectively. Marathon Group purchases from the Delhi Group totaled
          $18 million in 1997, $9 million in 1996 and $6 million in 1995. At
          December 31, 1997 and 1996, Marathon Group receivables included $3
          million and $19 million, respectively, related to transactions with
          other groups. Marathon Group accounts payable included none at
          December 31, 1997, and $2 million at December 31, 1996, related to
          transactions with the Delhi Group. These transactions were conducted
          on an arm's-length basis. After October 31, 1997, transactions with
          the Delhi Companies were treated as third-party transactions.

          INCOME TAXES RECEIVABLE FROM/PAYABLE TO OTHER GROUPS - At December 31,
          1997 and 1996, amounts receivable from/payable to other groups for
          income taxes were included in the balance sheet as follows:



          (In millions)                                                  December 31   1997   1996
          ------------------------------------------------------------------------------------------           
                                                                                     
          Current:
           Receivables                                                               $   2    $   1
           Accounts payable                                                             22       30
          Noncurrent:
           Deferred credits and other liabilities                                       97       83
          ------------------------------------------------------------------------------------------ 


               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 among 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.

- --------------------------------------------------------------------------------
22. STOCKHOLDERS' EQUITY

 
 

          (In millions, except per share data)                             1997     1996     1995
          ------------------------------------------------------------------------------------------ 
                                                                                    
          PREFERRED STOCK:
           Balance at beginning of year                                    $   -    $   -    $   78
           Redeemed                                                            -        -       (78)
                                                                            ------   ------   ------  
           Balance at end of year                                          $   -    $   -    $   - 
          ------------------------------------------------------------------------------------------ 
          COMMON STOCKHOLDERS' EQUITY (Note 4):   
           Balance at beginning of year                                    $3,340   $2,872   $3,163
           Net income (loss)                                                  456      664      (88)
           Marathon Stock issued                                               39        4        5
           Marathon Stock repurchased                                          -        -        (1)
           Dividends on preferred stock                                        -        -        (4)
           Dividends on Marathon Stock                            
            (per share: $.76 in 1997, $.70 in 1996 and $.68 in 1995)         (219)    (201)    (195)
           Foreign currency translation adjustments                            -        -         1
           Deferred compensation adjustments                                    1       -        (3)
           Minimum pension liability adjustments (Note 15)                     (2)       1       (6)
           Unrealized holding gains on investments                              3       -        -
                                                                           -------  -------  -------  
           Balance at end of year                                          $3,618   $3,340   $2,872
          ------------------------------------------------------------------------------------------ 
          TOTAL STOCKHOLDERS' EQUITY                                       $3,618   $3,340   $2,872
          ------------------------------------------------------------------------------------------ 


M-16

 
- --------------------------------------------------------------------------------
23. SALES OF RECEIVABLES

          The Marathon Group, prior to December 1997, participated in an
          agreement (the program) to sell an undivided interest in certain
          accounts receivable. At December 31, 1997, the amount sold under the
          program that had not been collected was zero, since the program was
          terminated in December 1997. The amount sold under the program
          averaged $314 million in 1997, $340 million in 1996 and $361 million
          in 1995.

- --------------------------------------------------------------------------------
24. 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
          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 (loss) per share is calculated by adjusting net
          income (loss) for dividend requirements of preferred stock and is
          based on the weighted average number of common shares outstanding.

               Diluted net income (loss) 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.



                                                                      1997                1996                  1995
                                                               ------------------  --------------------  --------------------
     COMPUTATION OF INCOME PER SHARE                            BASIC    DILUTED     Basic     Diluted     Basic     Diluted
     -------------------------------                           --------  --------  ---------  ---------  ---------  ---------
                                                                                                  
     Net income (loss) (millions):                                
      Income (loss) before extraordinary loss                  $    456  $    456  $    671   $    671   $    (83)  $    (83)
      Dividends on preferred stock                                  -         -         -          -           (4)        (4)
      Extraordinary loss                                            -         -          (7)        (7)        (5)        (5)
                                                               --------  --------  --------   --------   --------   -------- 
      Net income (loss) applicable to Marathon Stock                456       456       664        664        (92)       (92)
      Effect of dilutive securities -                          
       Convertible debentures                                       -           3       -           14       -        -
                                                               --------  --------  --------   --------   --------   -------- 
         Net income (loss) assuming conversions                $    456  $    459  $    664   $    678   $    (92)  $    (92)
                                                               ========  ========  ========   ========   ========   ======== 
     Shares of common stock outstanding (thousands):         
      Average number of common shares outstanding               288,038   288,038   287,460    287,460    287,271    287,271
      Effect of dilutive securities:                         
       Convertible debentures                                       -       1,936       -        8,975        -          -
       Stock options                                                -         546       -          133        -          -
                                                               --------  --------  --------   --------   --------   -------- 
         Average common shares and dilutive effect              288,038   290,520   287,460    296,568    287,271    287,271
                                                               --------  --------  --------   --------   --------   --------
     Per share:                                              
      Income (loss) before extraordinary loss                  $   1.59  $   1.58  $   2.33   $   2.31   $   (.31)  $   (.31)
      Extraordinary loss                                            -         -        (.02)      (.02)      (.02)      (.02)
                                                               --------  --------  --------   --------   --------   -------- 
      Net income (loss)                                        $   1.59  $   1.58  $   2.31   $   2.29   $   (.33)  $   (.33)
                                                               ========  ========  ========   ========   ========   ======== 


- --------------------------------------------------------------------------------
25. DERIVATIVE INSTRUMENTS

          The Marathon Group uses commodity-based derivative instruments to
          manage exposure to price fluctuations related to the anticipated
          purchase or production and sale of crude oil, natural gas, refined
          products and electricity. The derivative instruments used, as a part
          of an overall risk management program, include exchange-traded futures
          contracts and options, and instruments which require settlement in
          cash such as OTC commodity swaps and OTC options. While 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 certain price risk in isolated transactions.

               USX has used forward currency contracts to hedge foreign
          denominated debt, a portion of which has been attributed to the
          Marathon Group.

               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.

                                                                            M-17

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



                                                       FAIR                 CARRYING     RECORDED
                                                       VALUE                 AMOUNT      DEFERRED    AGGREGATE
                                                      ASSETS                 ASSETS       GAIN OR    CONTRACT
          (In millions)                           (LIABILITIES) /(A)/    (LIABILITIES)    (LOSS)     VALUES /(B)/
          ----------------------------------------------------------------------------------------------------- 
                                                                                                
          DECEMBER 31, 1997:                                
           Exchange-traded commodity futures         $  -                 $    -         $  -          $     30
           Exchange-traded commodity options              1  /(c)/               1            2             129
           OTC commodity swaps /(d)/                     (2) /(e)/              (2)          (3)             30
           OTC commodity options                        -                      -            -                 6
                                                     ------                -------       ------        -------- 
             Total commodities                       $   (1)               $    (1)      $   (1)       $    195
                                                     ------                -------       ------        --------
           Forward currency contract /(f)/:        
              - receivable                           $   10                $     9       $  -          $     52
              - payable                                  (1)                    (1)          (1)              5
                                                     ------                -------       ------        --------      
             Total currencies                        $    9                $     8       $   (1)         $   57
          -----------------------------------------------------------------------------------------------------  
          December 31, 1996:                      
           Exchange-traded commodity futures         $  -                  $   -         $   (2)         $   38
           Exchange-traded commodity options             (1) /(c)/              (1)          (2)            251
           OTC commodity swaps                           (3) /(e)/              (2)         -                32
           OTC commodity options                         (7)                    (7)          (1)             80
                                                     ------                -------       ------        -------- 
             Total commodities                       $  (11)               $   (10)      $   (5)         $  401
                                                     ------                -------       ------        --------
           Forward currency contract:             
              - receivable                           $   14                $    12       $  -            $   43
              - payable                                  (1)                    (1)          (1)              7
                                                     ------                -------       ------        -------- 
             Total currencies                        $   13                $    11       $   (1)         $   50
          -----------------------------------------------------------------------------------------------------  


          /(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 foreign 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)/ 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.
          /(c)/ Includes fair values as of December 31, 1997 and 1996, for
                assets of $3 million and $1 million and liabilities of $(2)
                million and $(2) million, respectively.
          /(d)/ The OTC swap arrangements vary in duration with certain
                contracts extending into mid 2000.
          /(e)/ Includes fair values as of December 31, 1997 and 1996, for
                assets of $1 million and $1 million and liabilities of $(3)
                million and $(4) million, respectively.
          /(f)/ The forward currency contract matures in 1998.

- --------------------------------------------------------------------------------
26. 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 25, 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:



                                                                           1997                        1996
                                                                  ------------------------    ----------------------
                                                                      FAIR     CARRYING          Fair      Carrying
          (In millions)                         December 31           VALUE     AMOUNT           Value      Amount
          ----------------------------------------------------------------------------------------------------------
                                                                                            
          FINANCIAL ASSETS:                                                     
           Cash and cash equivalents                                 $   36     $   36          $   32       $   32  
           Receivables                                                  856        856             613          613 
           Investments and long-term receivables                        143         86             204          163 
                                                                     ------     ------          ------       ------
               Total financial assets                                $1,035     $  978          $  849       $  808  
          ---------------------------------------------------------------------------------------------------------- 
          FINANCIAL LIABILITIES:                                      
           Notes payable                                             $  108     $  108          $   59       $   59
           Accounts payable                                           1,348      1,348           1,385        1,385
           Accrued interest                                              84         84              75           75
           Long-term debt (including amounts due within one year)     3,198      2,869           3,062        2,882
           Preferred stock of subsidiary                                187        184             185          182
                                                                     ------     ------          ------       ------
               Total financial liabilities                           $4,925     $4,593          $4,766       $4,583
          ---------------------------------------------------------------------------------------------------------- 


M-18

 
               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 accounts receivables sold and 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
          sales of receivables see Note 23, and for details relating to
          financial guarantees see Note 27.

- --------------------------------------------------------------------------------
27. 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, 1997, and December 31, 1996, accrued
          liabilities for remediation totaled $52 million and $37 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
          $42 million at December 31, 1997, and $23 million at December 31,
          1996.

               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 1997 and 1996, such
          capital expenditures totaled $81 million and $66 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, 1997, and December 31, 1996, accrued liabilities
          for platform abandonment and dismantlement totaled $128 million and
          $118 million, respectively.

          GUARANTEES -

               Guarantees by USX and its consolidated subsidiaries of the
          liabilities of affiliated entities of the Marathon Group totaled $23
          million and $46 million at December 31, 1997, and December 31, 1996,
          respectively. As of December 31, 1997, the largest guarantee for a
          single affiliate was $23 million.

               At December 31, 1997, and December 31, 1996, the Marathon Group's
          pro rata share of obligations of LOOP LLC and various pipeline
          affiliates secured by throughput and deficiency agreements totaled
          $165 million and $176 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, 1997, and December 31, 1996, contract commitments
          for the Marathon Group's capital expenditures for property, plant and
          equipment totaled $268 million and $388 million, respectively.

                                                                            M-19

 
- --------------------------------------------------------------------------------
28. SUBSEQUENT EVENT - BUSINESS COMBINATIONS

               On December 12, 1997, the Marathon Group and Ashland Inc.
          (Ashland) signed definitive agreements to combine the major elements
          of their refining, marketing and transportation (RM&T) operations.
          Pursuant to those agreements, on January 1, 1998, the Marathon Group
          transferred certain RM&T net assets to a new consolidated subsidiary,
          which was named Marathon Ashland Petroleum LLC (MAP). Also on January
          1, 1998, the Marathon Group acquired certain RM&T net assets from
          Ashland in exchange for a 38% interest in MAP. The acquisition will be
          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 the Marathon Group's ownership interest in
          MAP resulted in a change in interest gain which will be recognized in
          the first quarter 1998.

               In connection with the formation of MAP, the Marathon Group 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 the
          Marathon Group all of Ashland's ownership interest in MAP, for an
          amount in cash and/or the Marathon Oil Company 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 the Marathon Group's option, in three equal annual
          installments, the first of which would be payable at closing. At any
          time after December 31, 2004, the Marathon Group 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 for the Ashland RM&T net assets,
          giving effect to the acquisition as if it had been consummated at the
          beginning of the year 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)                     1997 /(a)/
          ----------------------------------------------------------------------
                                                                   
          Revenues                                                    $22,454
          Net income                                                      455
          Net income per common share:     
           Basic                                                         1.58
           Diluted                                                       1.57
          ----------------------------------------------------------------------

         /(a)/ The Marathon Group data is based on a calendar year. Ashland data
               is based on a twelve-month period ended September 30, 1997.

         /(b)/ Excluding the pro forma inventory market valuation adjustment,
               pro forma net income would have been $618 million. Reported net
               income, excluding the reported inventory market valuation
               adjustment, would have been $635 million.

M-20

 
Selected Quarterly Financial Data (Unaudited)



                                                                  1997
                                        --------------------------------------------------------------
(In millions, except per share data)    4TH QTR.       3RD QTR.          2ND QTR.          1ST QTR.
- ------------------------------------------------------------------------------------------------------
                                                                            
Revenues                                $ 3,920     $ 3,944/(a)/      $ 3,787/(a)/      $ 4,103/(a)/
Income from operations                       94         360/(a)/          243/(a)/          235/(a)/
  Costs and expenses include:
    Inventory market valuation
      charges (credits)                     147         (41)               64               114
Income before
  extraordinary loss                         38         192               118               108
Net income                                   38         192               118               108
- ------------------------------------------------------------------------------------------------------

MARATHON STOCK DATA:
- -------------------
Income before extraordinary
  loss applicable to
  Marathon Stock                         $   38      $  192            $  118            $  108
  -Per share: basic                         .14         .66               .41               .37
              diluted                       .13         .66               .41               .37
Dividends paid per share                    .19         .19               .19               .19
Price range of Marathon Stock (b):
  -Low                                       29          28-5/16           25-5/8            23-3/4
  -High                                      38-7/8      38-3/16           31-1/8            28-1/2
- ------------------------------------------------------------------------------------------------------


                                                                    1996
                                        --------------------------------------------------------------
(In millions, except per share data)      4TH QTR.       3RD QTR.        2ND QTR.       1ST QTR.
- ------------------------------------------------------------------------------------------------------
                                                                         
Revenues                                $ 4,457/(a)/   $ 4,202/(a)/  $ 4,078/(a)/    $ 3,657/(a)
Income from operations                      323/(a)/       325/(a)/      241/(a)/        407/(a)
  Costs and expenses include:
    Inventory market valuation
      charges (credits)                     (30)           (96)           72            (155)
Income before
  extraordinary loss                        167            164           124             216
Net income                                  160            164           124             216
- ------------------------------------------------------------------------------------------------------

MARATHON STOCK DATA:
- -------------------
Income before extraordinary
  loss applicable to
  Marathon Stock                        $   167        $   164       $   124         $   216
  -Per share: basic                         .58            .57           .43             .75
              diluted                       .57            .57           .43             .74
Dividends paid per share                    .19            .17           .17             .17
Price range of Marathon Stock /(b)/:
  -Low                                       21-1/8         20            19-1/8          17-1/4
  -High                                      25-1/2         22-1/8        22-7/8          20-1/2
- ------------------------------------------------------------------------------------------------------


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

Principal Unconsolidated Affiliates (Unaudited)



                                                                      DECEMBER 31, 1997
                 COMPANY                           COUNTRY                OWNERSHIP                    ACTIVITY
- -------------------------------------------------------------------------------------------------------------------------------
                                                                                      
CLAM Petroleum BV                                Netherlands                 50%               Oil & Gas Production
Kenai LNG Corporation                            United States               30%               Natural Gas Liquification
LOCAP, Inc.                                      United States               37%               Pipeline & Storage Facilities
LOOP LLC                                         United States               32%               Offshore Oil Port
Nautilus Pipeline Company, LLC                   United States               24%               Natural Gas Transmission
Sakhalin Energy Investment Company Ltd.          Russia                      38%               Oil & Gas Development
- ------------------------------------------------------------------------------------------------------------------------------- 


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


 
             Five-Year Operating Summary



                                                                                      1997      1996      1995      1994      1993
             -----------------------------------------------------------------------------------------------------------------------
                                                                                                                
             NET LIQUID HYDROCARBON PRODUCTION (thousands of barrels per day) 
              United States (by region)
               Alaska                                                                    -         8         9         9         9
               Gulf Coast                                                               29        30        33        12        10
               Southern                                                                  8         9        11        12        12
               Central                                                                   5         4         8         9         9
               Mid-Continent - Yates                                                    25        25        24        23        22
               Mid-Continent - Other                                                    21        20        19        18        18
               Rocky Mountain                                                           27        26        28        27        31
                                                                                    ------------------------------------------------
                 Total United States                                                   115       122       132       110       111
                                                                                    ------------------------------------------------
              International
               Abu Dhabi                                                                 -         -         -         1         2
               Egypt                                                                     8         8         5         7         6
               Indonesia                                                                 -         -        10         3         3
               Norway                                                                    2         3         2         2         2
               Tunisia                                                                   -         -         2         3         8
               United Kingdom                                                           39        48        54        46        24
                                                                                    ------------------------------------------------
                 Total International                                                    49        59        73        62        45
                                                                                    ------------------------------------------------
                  Total                                                                164       181       205       172       156
              Natural gas liquids included in above                                     17        17        17        15        14
             -----------------------------------------------------------------------------------------------------------------------
             NET NATURAL GAS PRODUCTION (millions of cubic feet per day) 
              United States (by region)
               Alaska                                                                  151       145       133       123       116
               Gulf Coast                                                               78        88        94        79        98
               Southern                                                                189       161       142       134        94
               Central                                                                 119       109       105       110       107
               Mid-Continent                                                           125       122       112        89        78
               Rocky Mountain                                                           60        51        48        39        36
                                                                                    ------------------------------------------------
                 Total United States                                                   722       676       634       574       529
              International                                                         ------------------------------------------------
               Egypt                                                                    11        13        15        17        17
               Ireland                                                                 228       259       269       263       258
               Norway                                                                   54        87        81        81        75
               United Kingdom - equity                                                 130       140        98        39        23
                              - other/(a)/                                              32        32        35         -         -
                                                                                    ------------------------------------------------
                 Total International                                                   455       531       498       400       373
                                                                                    ------------------------------------------------
                  Consolidated                                                       1,177     1,207     1,132       974       902
                 Equity affiliate/(b)/                                                  42        45        44        40        35
                                                                                    ------------------------------------------------
                  Total                                                              1,219     1,252     1,176     1,014       937
             -----------------------------------------------------------------------------------------------------------------------
             AVERAGE SALES PRICES
              Liquid Hydrocarbons (dollars per barrel)/(c)/
               United States                                                        $16.88    $18.58    $14.59    $13.53    $14.54
               International                                                         18.77     20.34     16.66     15.61     16.22
              Natural Gas (dollars per thousand cubic feet)/(c)/
               United States                                                        $ 2.20    $ 2.09    $ 1.63    $ 1.94    $ 1.94
               International                                                          2.00      1.97      1.80      1.58      1.52
             -----------------------------------------------------------------------------------------------------------------------
             NET PROVED RESERVES AT YEAR-END (developed and undeveloped) 
              Liquid Hydrocarbons (millions of barrels)
               United States                                                           609       589       558       553       573
               International                                                           187       203       206       242       269
                                                                                    ------------------------------------------------
                  Consolidated                                                         796       792       764       795       842
               Equity affiliate/(d)/                                                    82         -         -         -         -
                                                                                    ------------------------------------------------
                  Total                                                                878       792       764       795       842
              Developed reserves as % of total net reserves                             75%       78%       88%       90%       88%
             -----------------------------------------------------------------------------------------------------------------------
              Natural Gas (billions of cubic feet)
               United States                                                         2,220     2,239     2,210     2,127     2,045
               International                                                         1,071     1,199     1,379     1,527     1,703
                                                                                    ------------------------------------------------
                  Consolidated                                                       3,291     3,438     3,589     3,654     3,748
               Equity affiliate/(b)/                                                   111       132       131       153       153
                                                                                    ------------------------------------------------
                  Total                                                              3,402     3,570     3,720     3,807     3,901
              Developed reserves as % of total net reserves                             83%       83%       80%       79%       80%
             -----------------------------------------------------------------------------------------------------------------------


             /(a)/  Represents gas acquired for injection and subsequent
                    resale.
             /(b)/  Represents Marathon's equity interest in CLAM Petroleum
                    B.V.
             /(c)/  Prices exclude gains/losses from hedging activities.
             /(d)/  Represents Marathon's equity interest in Sakhalin Energy
                    Investment Company Ltd.

M-22

 
Five-Year Operating Summary  CONTINUED



                                                                        1997      1996      1995      1994      1993
- --------------------------------------------------------------------------------------------------------------------------
                                                                                                  
U.S. REFINERY OPERATIONS (thousands of barrels per day)
  In-use crude oil capacity at year-end                                   575       570       570       570       570
  Refinery runs - crude oil refined                                       525       511       503       491       549
                - other charge and blend stocks                            99        96        94       107       102
  In-use crude oil capacity utilization rate                               92%       90%       88%       86%       90%
- -------------------------------------------------------------------------------------------------------------------------- 
SOURCE OF CRUDE PROCESSED (thousands of barrels per day)
  United States                                                           202       229       254       218       299
  Europe                                                                   10        12         6        31         3
  Middle East and Africa                                                  241       193       183       171       173
  Other International                                                      72        79        58        70        75
                                                                      ----------------------------------------------------
          Total                                                           525       513       501       490       550
- -------------------------------------------------------------------------------------------------------------------------- 
REFINED PRODUCT YIELDS (thousands of barrels per day)
  Gasoline                                                                353       345       339       340       369
  Distillates                                                             154       155       146       146       157
  Propane                                                                  13        13        12        13        15
  Feedstocks and special products                                          36        35        38        33        33
  Heavy fuel oil                                                           35        30        31        38        39
  Asphalt                                                                  39        36        36        30        38
                                                                      ----------------------------------------------------
          Total                                                           630       614       602       600       651
- -------------------------------------------------------------------------------------------------------------------------- 
REFINED PRODUCTS YIELDS (% breakdown)
  Gasoline                                                                 56%       56%       57%       57%       57%
  Distillates                                                              24        25        24        24        24
  Other products                                                           20        19        19        19        19
                                                                      ----------------------------------------------------
          Total                                                           100%      100%      100%      100%      100%
- -------------------------------------------------------------------------------------------------------------------------- 
U.S. REFINED PRODUCT SALES (thousands of barrels per day)
  Gasoline                                                                452       468       445       443       420
  Distillates                                                             198       192       180       183       179
  Propane                                                                  12        12        12        16        18
  Feedstocks and special products                                          40        37        44        32        32
  Heavy fuel oil                                                           34        31        31        38        39
  Asphalt                                                                  39        35        35        31        38
                                                                      ----------------------------------------------------
          Total                                                           775       775       747       743       726
  Matching buy/sell volumes included in above                              51        71        47        73        47
- -------------------------------------------------------------------------------------------------------------------------- 
REFINED PRODUCTS SALES BY CLASS OF TRADE (as a % of total sales)
  Wholesale - independent private-brand
              marketers and consumers                                      61%       62%       61%       62%       63%
  Retail    - Marathon brand outlets                                       13        13        13        13        13
            - Emro Marketing Company outlets                               26        25        26        25        24
                                                                      ----------------------------------------------------
          Total                                                           100%      100%      100%      100%      100%
- -------------------------------------------------------------------------------------------------------------------------- 
REFINED PRODUCTS (dollars per barrel)
  Average sales price                                                 $ 26.38   $ 27.43   $ 23.80   $ 22.75   $ 23.42
  Average cost of crude oil throughput                                  19.00     21.94     18.09     16.59     17.05
- -------------------------------------------------------------------------------------------------------------------------- 
PETROLEUM INVENTORIES AT YEAR-END (thousands of barrels)
  Crude oil and natural gas liquids                                    18,660    19,325    21,598    21,892    21,689
  Refined products                                                     20,598    21,283    22,102    23,657    23,136
- -------------------------------------------------------------------------------------------------------------------------- 
U.S. REFINED PRODUCT MARKETING OUTLETS AT YEAR-END
  Marathon operated terminals                                              51        51        51        51        51
  Retail - Marathon brand                                               2,465     2,392     2,380     2,356     2,331
         - Emro Marketing Company                                       1,544     1,592     1,627     1,659     1,571
- -------------------------------------------------------------------------------------------------------------------------- 
PIPELINES (miles of common carrier pipelines, including affiliates)
  Crude Oil - gathering lines                                           1,003     1,052     1,115     1,115     1,130
            - trunklines                                                2,552     2,552     2,553     2,559     2,581
  Products  - trunklines                                                1,493     1,493     1,494     1,494     1,495
                                                                      ----------------------------------------------------
          Total                                                         5,048     5,097     5,162     5,168     5,206
- -------------------------------------------------------------------------------------------------------------------------- 
PIPELINE BARRELS HANDLED (millions)
  Crude Oil - gathering lines                                            43.9      43.2      43.8      43.4      43.8
            - trunklines                                                369.6     378.7     371.3     353.0     382.4
  Products  - trunklines                                                262.4     274.8     252.3     282.2     295.6
                                                                      ----------------------------------------------------
          Total                                                         675.9     696.7     667.4     678.6     721.8
- -------------------------------------------------------------------------------------------------------------------------- 
CARNEGIE NATURAL GAS COMPANY STATISTICS
  Miles of pipeline                                                     1,794     1,787     1,800     1,799     1,810
  Reserves dedicated to gathering operations -- owned
   (proved developed -- billions of cubic feet)                          39.8      42.8      44.3      43.8      46.7
  Natural gas throughput (billions of cubic feet)                        31.8      34.1      34.1      27.9      37.2
- --------------------------------------------------------------------------------------------------------------------------


                                                                            M-23

 
Five-Year Financial Summary



(Dollars in millions, except as noted)                    1997        1996             1995            1994            1993
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
REVENUES
 Refined products                                       $ 7,012      $ 7,132          $ 6,127         $ 5,622         $ 5,769
 Merchandise                                              1,045        1,000              941             869             792
 Liquid hydrocarbons                                        941        1,111              881             800             627
 Natural gas                                              1,331        1,194              950             670             607
 Crude oil and refined products
  matching buy/sell transactions/(a)/                     2,436        2,912            2,067           2,071           2,018
 Excise taxes/(a)/                                        2,736        2,768            2,708           2,542           1,927
 Gain on sale of assets                                      37           55                8             172              33
 All other                                                  216          222              231             203             248
                                                      -----------------------------------------------------------------------------
  Total revenues                                        $15,754      $16,394/(b)/     $13,913/(b)/    $12,949/(b)/    $12,021/(b)/
- ----------------------------------------------------------------------------------------------------------------------------------- 

INCOME FROM OPERATIONS
 U.S. production                                        $   626      $   627          $   376         $   258         $   179
 U.S. exploration expense                                  (126)         (97)             (70)            (84)            (60)
 International production                                   336          423              257             138              55
 International exploration expense                          (63)         (49)             (79)            (73)            (85)
 Refining, marketing and transportation                     563          239              274             423             413
 Other energy related businesses                             48           77               60              34              37
 Administrative                                            (168)        (133)             (82)            (80)            (70)
 Inventory market valuation
  (charges) credits                                        (284)         209               70             160            (241)
 Impairment of long-lived assets                             -            -              (659)             -               -
                                                      -----------------------------------------------------------------------------
  Total income from operations                              932        1,296/(b)/         147/(b)/        776/(b)/        228/(b)/
 Net interest and other financial costs                     260          305              337             300             283
 Provision (credit) for income taxes                        216          320             (107)            155             (49)
                                                      -----------------------------------------------------------------------------
INCOME (LOSS) BEFORE EXTRAORDINARY LOSS
  AND CUMULATIVE EFFECT OF CHANGES IN
  ACCOUNTING PRINCIPLES                                 $   456      $   671          $   (83)        $   321         $    (6)
 Per common share - basic (in dollars)                     1.59         2.33             (.31)           1.10            (.04)
                  - diluted (in dollars)                   1.58         2.31             (.31)           1.10            (.04)
- ----------------------------------------------------------------------------------------------------------------------------------- 

NET INCOME (LOSS)                                       $   456      $   664          $   (88)        $   321         $   (29)
 Per common share - basic (in dollars)                     1.59         2.31             (.33)           1.10            (.12)
                  - diluted (in dollars)                   1.58         2.29             (.33)           1.10            (.12)
- ----------------------------------------------------------------------------------------------------------------------------------- 

BALANCE SHEET POSITION AT YEAR-END
 Current assets                                         $ 2,018      $ 2,046          $ 1,888         $ 1,737         $ 1,572
 Net property, plant and equipment                        7,566        7,298            7,521           8,471           8,536
 Total assets                                            10,565       10,151           10,109          10,951          10,822
 Short-term debt                                            525          323              384              56              24
 Other current liabilities                                1,737        1,819            1,641           1,656           1,619
 Long-term debt                                           2,476        2,642            3,367           3,983           4,274
 Common stockholders' equity                              3,618        3,340            2,872           3,163           3,032
  Per share (in dollars)                                  12.53        11.62             9.99           11.01           10.58
- ----------------------------------------------------------------------------------------------------------------------------------- 

CASH FLOW DATA
 Net cash from operating activities                     $ 1,246      $ 1,503          $ 1,044         $   720         $   830
 Net cash from operating activities
  before working capital changes                          1,460        1,339            1,128             944             910
 Capital expenditures                                     1,038          751              642             753             910
 Disposal of assets                                          60          282               77             263             174
 Dividends paid                                             219          201              199             201             201
- ----------------------------------------------------------------------------------------------------------------------------------- 

EMPLOYEE DATA
 Marathon Group:
  Total employment costs                                $   854      $   790          $   781         $   856         $   845
  Average number of employees                            20,695       20,461           21,015          21,005          21,963
  Number of pensioners at year-end                        3,099        3,203            3,378           3,495           3,572
 Emro Marketing Company:
 (Included in Marathon Group totals)
  Total employment costs                                $   263      $   241          $   229         $   221         $   211
  Average number of employees                            12,816       12,474           12,087          11,669          11,550
  Number of pensioners at year-end                          215          207              206             199             187
- ----------------------------------------------------------------------------------------------------------------------------------- 

STOCKHOLDER DATA AT YEAR-END
 Number of common shares
 outstanding (in millions)                                288.8        287.5            287.4           287.2           286.6
 Registered shareholders (in thousands)                    84.0         92.1            101.2           110.4           118.5
 Market price of common stock                           $33.750      $23.875          $19.500         $16.375         $16.500
- -----------------------------------------------------------------------------------------------------------------------------------


/(a)/  These items are included in both revenues and costs and expenses,
       resulting in no effect on income.

/(b)/  Reclassified to conform to 1997 classifications.

M-24

 
               Management's Discussion and Analysis

                   The Marathon Group includes Marathon Oil Company ("Marathon")
               and certain other subsidiaries of USX Corporation ("USX"), which
               are engaged in worldwide exploration, production, transportation
               and marketing of crude oil and natural gas; domestic refining,
               marketing and transportation of petroleum products; and power
               generation. Effective January 1, 1998, the USX - Marathon Group
               and Ashland Inc. formed a new refining, marketing and
               transportation company, Marathon Ashland Petroleum LLC ("MAP").
               For further discussion of MAP, see Note 28 to the Marathon Group
               Financial Statements and Management's Discussion and Analysis of
               Operations - Outlook herein. Management's Discussion and Analysis
               should be read in conjunction with the Marathon Group's Financial
               Statements and Notes to Financial Statements.

                   During 1997, the Marathon Group's financial performance was
               primarily led by strong refined product margins, which
               significantly offset the unfavorable effects of lower worldwide
               liquid hydrocarbon prices and volumes. In addition, Marathon
               increased its 1997 capital and investment expenditures by $507
               million, or 66%, from 1996 levels, substantially funding its
               spending with cash provided by operating activities.

                   Certain sections of Management's Discussion and Analysis
               include forward-looking statements concerning trends or events
               potentially affecting the businesses of the Marathon Group. These
               statements typically contain words such as "anticipates",
               "believes", "estimates", "expects" or similar words indicating
               that future outcomes are uncertain. In accordance with "safe
               harbor" provisions of the Private Securities Litigation Reform
               Act of 1995, these statements are accompanied by cautionary
               language identifying important factors, though not necessarily
               all such factors, that could cause future outcomes to differ
               materially from those set forth in forward-looking statements.
               For additional risk factors affecting the businesses of the
               Marathon Group, see Supplementary Data - Disclosures About
               Forward-Looking Statements in USX's 1997 Form 10-K.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF INCOME

                   REVENUES for each of the last three years are summarized in
               the following table:



               (Dollars in millions)                               1997       1996       1995
               -----------------------------------------------------------------------------------
                                                                              
               Refined products                                  $  7,012   $  7,132   $  6,127
               Merchandise                                          1,045      1,000        941
               Liquid hydrocarbons                                    941      1,111        881
               Natural gas                                          1,331      1,194        950
               Transportation and other/(a)/(c)/                      253        277        239
                                                                 --------   --------   --------
               Subtotal                                            10,582     10,714      9,138
                                                                 --------   --------   --------
               Matching buy/sell transactions/(b)/                  2,436      2,912      2,067
               Excise taxes/(b)/                                    2,736      2,768      2,708
                                                                 --------   --------   --------
                     Total revenues/(c)/                         $ 15,754   $ 16,394   $ 13,913
               -----------------------------------------------------------------------------------


               /(a)/ Includes dividend and affiliate income, net gains on
                     disposal of assets and other income.
               /(b)/ Included in both revenues and operating costs, resulting in
                     no effect on income.
               /(c)/ Amounts in 1996 and 1995 were reclassified in 1997 to
                     include dividend and affiliate income and other income, and
                     to conform to other 1997 classifications.

                   Revenues (excluding matching buy/sell transactions and excise
               taxes) decreased by $132 million in 1997 from 1996 and increased
               by $1,576 million in 1996 from 1995. The decrease in 1997 mainly
               reflected lower average refined product prices and lower
               worldwide liquid hydrocarbon prices and volumes, partly offset by
               increased volumes of refined products and higher domestic natural
               gas volumes and prices. The increase in 1996 primarily resulted
               from higher average refined product, worldwide liquid hydrocarbon
               and natural gas prices, partially offset by lower worldwide
               liquid hydrocarbon volumes.

                                                                            M-25

 
               Management's Discussion and Analysis CONTINUED

                    INCOME FROM OPERATIONS and certain items included in income
               from operations for each of the last three years are summarized
               in the following table:



               (Dollars in millions)                                              1997       1996       1995
               --------------------------------------------------------------------------------------------------
                                                                                             
               Income from operations/(a)/                                      $   932    $ 1,296    $   147
               Less: Certain favorable (unfavorable) items
                IMV reserve adjustment/(b)/                                        (284)       209         70
                Net gains on certain asset sales/(c)/                                -          35         -
                Charges for withdrawal from MPA/(d)/                                 -         (10)        -
                Certain state tax adjustments/(e)/                                   -         (11)        -
                Impairment of long-lived assets/(f)/                                 -          -        (659)
                Expected environmental remediation recoveries/(g)/                   -          -          15
                                                                                -------    -------    -------
                    Subtotal                                                       (284)       223       (574)
                                                                                -------    -------    -------
                    Income from operations excluding above items                $ 1,216    $ 1,073    $   721
               --------------------------------------------------------------------------------------------------


               /(a)/ Consists of operating income, dividend and affiliate
                     income, net gains on disposal of investments and other
                     income. Amounts for 1996 and 1995 were reclassified in 1997
                     to include dividend and affiliate income and other income,
                     and to conform to other 1997 classifications. See Note 9 to
                     the Consolidated Financial Statements for a discussion of
                     operating income.
               /(b)/ The inventory market valuation ("IMV") reserve reflects the
                     extent to which the recorded LIFO cost basis of crude oil
                     and refined products inventories exceeds net realizable
                     value. For additional details of this noncash adjustment,
                     see discussion below.
               /(c)/ Includes net gains on sales of interests in a domestic
                     pipeline company and certain production properties.
               /(d)/ Marine Preservation Association ("MPA") is a non-profit oil
                     spill response group.
               /(e)/ Accrual of domestic production taxes for prior years.
               /(f)/ Related to adoption of Statement of Financial Accounting
                     Standards No. 121 - "Accounting for the Impairment of Long-
                     Lived Assets and for Long-Lived Assets to be Disposed Of "
                     ("SFAS No. 121").
               /(g)/ Expected recoveries from state governments of expenditures
                     related to underground storage tanks at retail marketing
                     outlets.

                    Adjusted income from operations increased by $143 million in
               1997 from 1996 and by $352 million in 1996 from 1995. The
               improvement in 1997 was primarily due to higher average refined
               product margins and higher worldwide natural gas prices,
               partially offset by reduced worldwide liquid hydrocarbon
               production and prices, higher worldwide exploration expense and
               increased administrative expenses. The improvement in 1996 from
               1995 was primarily due to higher worldwide liquid hydrocarbon and
               natural gas prices, reduced depreciation, depletion and
               amortization ("DD&A") expense, resulting mainly from the fourth
               quarter 1995 adoption of SFAS No. 121 and property sales, and
               increased worldwide volumes of natural gas. These favorable
               effects were partially offset by lower worldwide liquid
               hydrocarbon volumes, net losses on production hedging activities
               (primarily occurring in the fourth quarter of 1996) and lower
               refined product margins. For additional details, see Management's
               Discussion and Analysis of Operations.

                    With respect to the IMV reserve adjustment, when U. S. Steel
               Corporation acquired Marathon Oil Company in March 1982, crude
               oil and refined product prices were at historically high levels.
               In applying the purchase method of accounting, Marathon's crude
               oil and refined product inventories were revalued by reference to
               current prices at the time of acquisition. This became the new
               LIFO cost basis of the inventories, which has been maintained
               since the 1982 acquisition. Generally accepted accounting
               principles require that inventories be valued at lower of cost or
               market. Accordingly, Marathon has established an IMV reserve to
               reduce the LIFO cost basis of these inventories on a quarterly
               basis, to the extent necessary, to current market value.
               Adjustments to the IMV reserve result in noncash charges or
               credits to income from operations. These adjustments affect the
               comparability of financial results from period to period as well
               as comparisons with other energy companies, which may not have
               such adjustments. The IMV reserve adjustments have been
               separately reported, on a consistent basis, as a component of
               operating results and separately identified in management's
               discussion of operations.

                    Commodity prices have fluctuated widely and, since 1986,
               have generally remained below prices that existed at the time of
               the 1982 acquisition, resulting in periodic adjustments to the
               LIFO cost basis of the inventories. At December 31, 1997, LIFO
               cost exceeded market prices by $284 million, resulting in a
               corresponding charge to income from operations for total year
               1997. During 1996 and 1995, favorable market price movements
               resulted in credits to income from operations of $209 million

M-26

 
               Management's Discussion and Analysis CONTINUED

               and $70 million, respectively. The $493 million variance in
               income from operations between 1997 and 1996 for the IMV reserve
               adjustments (and $139 million variance between 1996 and 1995)
               affects the comparability of reported financial results. In
               management's opinion, the Marathon Group's operating performance
               should be evaluated exclusive of the IMV reserve adjustments,
               which management believes provides a more indicative view of the
               profit and cash flow performance of the Group.

                    NET INTEREST AND OTHER FINANCIAL COSTS decreased by $45
               million in 1997 from 1996, following a decrease of $32 million in
               1996 from 1995. The decrease in both periods was mainly due to
               lower average debt levels, while 1997 also reflected an increase
               in capitalized interest on worldwide exploration and production
               projects. For additional details, see Note 6 to the Marathon
               Group Financial Statements.

                    The CREDIT FOR ESTIMATED INCOME TAXES in 1995 included
               incremental tax benefits of $44 million resulting from USX's
               election to credit, rather than deduct, foreign income taxes for
               U.S. federal income tax purposes. For reconciliation of the
               federal statutory tax rate to total provisions (credits), see
               Note 18 to the Marathon Group Financial Statements.

                    An EXTRAORDINARY LOSS on extinguishment of debt of $7
               million in 1996 and $5 million in 1995 represents the portion of
               the loss on early extinguishment of USX debt attributed to the
               Marathon Group. For additional information, see Note 8 to the
               Marathon Group Financial Statements.

                    NET INCOME decreased by $208 million in 1997 from 1996,
               following an increase of $752 million in 1996 from 1995.
               Excluding the aftertax effects of the IMV reserve adjustment and
               other special items, financial results increased by $106 million
               in 1997 from 1996 and by $300 million in 1996 from 1995,
               primarily reflecting the factors discussed above.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION, CASH FLOWS AND
LIQUIDITY

                    CURRENT ASSETS declined $28 million from year-end 1996,
               primarily due to a decrease in inventories, offset by an increase
               in receivables. The reduced inventory values were due mainly to
               lower year-end refined product prices, which resulted in an IMV
               reserve of $284 million. The increase in receivables was
               primarily due to the termination of the accounts receivable sales
               program (see Note 23 to the Marathon Group Financial Statements),
               partly offset by a reduction in trade receivables from lower 
               year-end commodity prices.

                    CURRENT LIABILITIES increased $120 million from year-end
               1996, primarily due to an increase in long-term debt due within
               one year.

                    NET PROPERTY, PLANT AND EQUIPMENT increased by $268 million
               from year-end 1996, primarily reflecting property additions in
               excess of DD&A and dry well write-offs. Net property, plant and
               equipment for each of the last three years is summarized in the
               following table:



               (Dollars in millions)                          1997      1996      1995
               ---------------------------------------------------------------------------
                                                                       
               Exploration and production
                United States                               $ 3,452   $ 3,172   $ 3,220
                International                                 2,165     2,197     2,419
               Refining                                         751       758       766
               Marketing                                        834       802       753
               Transportation                                   271       285       276
               Other                                             93        84        87
                                                            -------   -------   -------
                    Total                                   $ 7,566   $ 7,298   $ 7,521
               ---------------------------------------------------------------------------


                    TOTAL LONG-TERM DEBT AND NOTES PAYABLE at December 31, 1997
               was $3.0 billion, essentially unchanged from year-end 1996,
               mainly reflecting that cash required for Marathon's expanded
               capital and investment expenditure program and for dividend
               payments was substantially provided by cash from operating
               activities, trust withdrawals and asset disposals. Virtually all
               of the debt is a direct obligation of, or is guaranteed by, USX.

                    Net cash provided from operating activities totaled $1,246
               million in 1997, compared with $1,503 million in 1996 and $1,044
               million in 1995. Cash provided from operating activities in 1997
               included the impact of terminating Marathon's participation in an
               accounts receivable sales program, resulting in a cash outflow of
               $340 million. Operating cash flow in 1996 included payments of
               $39 million related to certain state tax issues, while 1995
               included payments of $96 million

                                                                            M-27

 
               Management's Discussion and Analysis CONTINUED

               representing the Marathon Group's share of the amortized discount
               on USX's zero coupon debentures. Excluding the effects of these
               items, net cash from operating activities increased by $44
               million in 1997 from 1996 and by $402 million in 1996 from 1995.
               The increase in 1997 mainly reflected improved net income
               (excluding the IMV reserve adjustment and other noncash items),
               partially offset by increased income tax payments. The increase
               in 1996 was primarily due to favorable working capital changes
               and improved net income (excluding the IMV reserve adjustment and
               other noncash items).

                    CAPITAL EXPENDITURES for each of the last three years are
               summarized in the following table:



               (Dollars in millions)                                              1997      1996      1995
               ------------------------------------------------------------------------------------------------
                                                                                           
               Exploration and production ("Upstream")
                United States                                                   $   647   $   424   $   322
                International                                                       163        80       141
                                                                                -------   -------   -------
                    Total exploration and production                                810       504       463
               Refining, marketing and transportation ("Downstream")                216       222       169
               Other                                                                 12        25        10
                                                                                -------   -------   -------
                    Total                                                       $ 1,038   $   751   $   642
               ------------------------------------------------------------------------------------------------


                    During 1997, domestic upstream capital spending mainly
               included development of Gulf of Mexico properties, including
               Viosca Knoll 786 (Petronius), Green Canyon 244 (Troika), Ewing
               Bank 963 (Arnold) and Ewing Bank 917 (Oyster). International
               upstream spending included development of the West Brae field in
               the U.K. North Sea and projects in Egypt and offshore Gabon.
               Downstream spending in 1997 mainly consisted of upgrading and
               expanding Emro Marketing Company's network of retail outlets, and
               refinery modification projects. Contract commitments for capital
               expenditures at year-end 1997 were $268 million, compared with
               $388 million at year-end 1996.

                    Capital expenditures in 1998 are expected to increase to
               approximately $1.3 billion, with the increase from 1997 levels
               mainly due to the inclusion of 100% of the capital requirements
               for MAP, which commenced operations on January 1, 1998. Domestic
               upstream projects planned for 1998 include continuing development
               of Petronius and Green Canyon 112/113 (Stellaria) in the Gulf of
               Mexico, while international upstream projects include development
               of the Tchatamba South field, offshore Gabon. Downstream spending
               by MAP will primarily consist of upgrades and expansions of
               retail marketing outlets and refinery modifications.

                    INVESTMENTS IN EQUITY AFFILIATES of $233 million in 1997
               mainly reflected funding of equity affiliates' capital projects,
               primarily the Sakhalin II project in the Russian Far East Region
               and the Nautilus natural gas pipeline system in the Gulf of
               Mexico. Also included were Marathon's acquisition of an
               additional 7.5% interest in Sakhalin Energy Investment Company
               Ltd. ("Sakhalin Energy"), bringing its total interest to 37.5%,
               investment in the Odyssey crude oil pipeline system in the Gulf
               of Mexico (with a 29% interest) and acquisition of a 50%
               ownership in a power generation company in Ecuador.

                    In 1998, investments in equity affiliates are expected to be
               approximately $150 million, primarily reflecting additional
               funding of Sakhalin Energy's spending on the Sakhalin II project
               and funding of power generation projects. Although project
               expenditures for the Sakhalin II project remain high, third-party
               financing arranged by Sakhalin Energy is expected to reduce the
               need for direct investment by Marathon in 1998.

                    The above statements with respect to future capital
               expenditures and investments are forward-looking statements,
               reflecting management's best estimates, based on information
               currently available. To the extent this information proves to be
               inaccurate, the timing and levels of future spending could differ
               materially from those included in the forward-looking statements.
               Factors that could cause future capital expenditures and
               investments to differ materially from present expectations
               include industry supply and demand factors, general economic
               conditions, levels of cash flow from operations, available
               business opportunities, unforeseen hazards such as weather
               conditions, and/or by delays in obtaining government or partner
               approval. In addition, levels of investments may be affected by
               the ability of equity affiliates to obtain third-party financing.

                    Cash from disposal of assets was $60 million in 1997,
               compared with $282 million in 1996 and $77 million in 1995.
               Proceeds in 1997 were mainly from the sales of interests in
               various domestic upstream properties, certain cost-basis
               investments and an interest in a domestic pipeline company.
               Proceeds in 1996 primarily reflected the sales of interests in
               certain domestic and international oil

M-28

 
               Management's Discussion and Analysis CONTINUED

               and gas production properties and the sale of an equity interest
               in a domestic pipeline company. Proceeds in 1995 were mainly from
               the sales of certain domestic oil and gas production properties.

                    WITHDRAWAL FROM PROPERTY EXCHANGE TRUSTS of $98 million in
               1997 mainly represented cash withdrawn from an interest-bearing
               escrow account that was established in 1996 in connection with
               the disposal of oil production properties in Alaska.

                    FINANCIAL OBLIGATIONS increased $58 million in 1997 as net
               cash provided from operating activities, trust withdrawals and
               asset sales was slightly exceeded by cash used for capital
               expenditures, investments in equity affiliates and dividend
               payments. Financial obligations consist of the Marathon Group's
               portion of USX debt and preferred stock of a subsidiary
               attributed to both groups, as well as debt specifically
               attributed to the Marathon Group. For discussion of USX financing
               activities attributed to both groups, see Management's Discussion
               and Analysis of USX Consolidated Financial Condition, Cash Flows
               and Liquidity.

                    DIVIDENDS PAID in 1997 increased by $18 million from 1996,
               mainly due to a two-cents-per-share increase in the quarterly
               USX - Marathon Group Common Stock dividend rate, initially
               declared in October 1996.

                    In January 1998, the USX Board of Directors declared a
               fourth quarter dividend on the USX - Marathon Group Common Stock
               of 21 cents per share, an increase of two cents per share over
               the previous quarterly dividend. Total dividends paid on the USX
               Marathon Group Common Stock in the first quarter of 1998 will
               increase by approximately $6 million as a result of this
               increase.

               DERIVATIVE INSTRUMENTS

                    See Quantitative and Qualitative Disclosures About Market
               Risk for a discussion of derivative instruments and associated
               market risk.

               LIQUIDITY

                    For discussion of USX's liquidity and capital resources, see
               Management's Discussion and Analysis of USX Consolidated
               Financial Condition, Cash Flows and Liquidity.


MANAGEMENT'S DISCUSSION AND ANALYSIS OF ENVIRONMENTAL MATTERS, LITIGATION AND
CONTINGENCIES

                    The Marathon Group has incurred and will continue to incur
               substantial capital, operating and maintenance, and remediation
               expenditures as a result of environmental laws and regulations.
               To the extent these expenditures, as with all costs, are not
               ultimately reflected in the prices of the Marathon Group's
               products and services, operating results will be adversely
               affected. The Marathon Group believes that substantially all of
               its competitors are subject to similar environmental laws and
               regulations. However, the specific impact on each competitor may
               vary depending on a number of factors, including the age and
               location of its operating facilities, marketing areas, production
               processes and whether or not it is engaged in the petrochemical
               or power business or the marine transportation of crude oil and
               refined products.

                    Marathon Group environmental expenditures for each of the
               last three years were/(a)/:



               (Dollars in millions)                    1997      1996      1995
               ----------------------------------------------------------------------
                                                                  
               Capital                                 $   81    $   66    $   50
               Compliance
                Operating & maintenance                    84        75       102
                Remediation/(b)/                           19        26        37
                                                       ------    ------    ------
                    Total                              $  184    $  167    $  189
               ----------------------------------------------------------------------


               /(a)/ Amounts are based on American Petroleum Institute survey
                     guidelines.
               /(b)/ These amounts do not include noncash provisions recorded
                     for environmental remediation, but include spending charged
                     against such reserves, net of recoveries, where
                     permissible.

                    The Marathon Group's environmental capital expenditures
               accounted for 8% of total capital expenditures in 1997 and 1995
               and 9% in 1996.

                    During 1995 through 1997, compliance expenditures
               represented 1% of the Marathon Group's total operating costs.
               Remediation spending during this period was primarily related to
               retail

                                                                            M-29

 
               Management's Discussion and Analysis CONTINUED

               marketing outlets which incur ongoing clean-up costs for soil and
               groundwater contamination associated with underground storage
               tanks and piping.

                    USX has been notified that it is a potentially responsible
               party ("PRP") at 20 waste sites related to the Marathon Group
               under the Comprehensive Environmental Response, Compensation and
               Liability Act ("CERCLA") as of December 31, 1997. In addition,
               there are 11 sites related to the Marathon Group where USX has
               received information requests or other indications that USX may
               be a PRP under CERCLA but where sufficient information is not
               presently available to confirm the existence of liability. There
               are also 71 additional sites, excluding retail marketing outlets,
               related to the Marathon Group where remediation is being sought
               under other environmental statutes, both federal and state, or
               where private parties are seeking remediation through discussions
               or litigation. At many of these sites, USX is one of a number of
               parties involved and the total cost of remediation, as well as
               USX's share thereof, is frequently dependent upon the outcome of
               investigations and remedial studies. The Marathon Group accrues
               for environmental remediation activities when the responsibility
               to remediate is probable and the amount of associated costs is
               reasonably determinable. As environmental remediation matters
               proceed toward ultimate resolution or as additional remediation
               obligations arise, charges in excess of those previously accrued
               may be required. See Note 27 to the Marathon Group Financial
               Statements.

                    Effective January 1, 1997, USX adopted the American
               Institute of Certified Public Accountants Statement of Position
               No. 96-1 - "Environmental Remediation Liabilities" - which
               requires that companies include direct costs in accruals for
               remediation liabilities. Income from operations in 1997 included
               first quarter charges of $7 million (net of expected recoveries)
               related to such adoption, primarily for accruals of post-closure
               monitoring costs, study costs and administrative costs. See Note
               3 to the Marathon Group Financial Statements for additional
               discussion.

                    New or expanded environmental requirements, which could
               increase the Marathon Group's environmental costs, may arise in
               the future. USX intends to comply with all legal requirements
               regarding the environment, but since many of them are not fixed
               or presently determinable (even under existing legislation) and
               may be affected by future legislation, it is not possible to
               predict accurately the ultimate cost of compliance, including
               remediation costs which may be incurred and penalties which may
               be imposed. However, based on presently available information,
               and existing laws and regulations as currently implemented, the
               Marathon Group does not anticipate that environmental compliance
               expenditures (including operating and maintenance and
               remediation) will materially increase in 1998. The Marathon
               Group's capital expenditures for environmental controls are
               expected to be approximately $100 million in 1998. Predictions
               beyond 1998 can only be broad-based estimates which have varied,
               and will continue to vary, due to the ongoing evolution of
               specific regulatory requirements, the possible imposition of more
               stringent requirements and the availability of new technologies,
               among other matters. Based upon currently identified projects,
               the Marathon Group anticipates that environmental capital
               expenditures will be approximately $70 million in 1999; however,
               actual expenditures may vary as the number and scope of
               environmental projects are revised as a result of improved
               technology or changes in regulatory requirements and could
               increase if additional projects are identified or additional
               requirements are imposed.

                    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
               which are discussed in Note 27 to the Marathon Group Financial
               Statements. 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. See Management's Discussion and Analysis
               of USX Consolidated Financial Condition, Cash Flows and
               Liquidity.

M-30

 
               Management's Discussion and Analysis CONTINUED

MANAGEMENT'S DISCUSSION AND ANALYSIS OF OPERATIONS

                    The Marathon Group's income from operations and average
               volumes and selling prices for each of the last three years were
               as follows:

                          INCOME FROM OPERATIONS/(a)/

 
 
               (Dollars in millions)                                              1997       1996      1995
               -------------------------------------------------------------------------------------------------
                                                                                             
               Exploration and production (Upstream)
                Domestic                                                        $   500    $   530    $  306
                International                                                       273        374       178
                                                                                -------    -------    ------
                    Total exploration and production                                773        904       484
               Refining, marketing and transportation (Downstream)                  563        239       274
               Other energy related businesses/(b)/                                  48         77        60
               Administrative/(c)/                                                 (168)      (133)      (82)
                                                                                -------    -------    ------
                                                                                  1,216      1,087       736
               Impairment of long-lived assets/(d)/                                 -          -        (659)
               IMV reserve adjustment                                              (284)       209        70
                                                                                -------    -------    ------
                    Total                                                       $   932    $ 1,296    $  147
               -------------------------------------------------------------------------------------------------


               /(a)/ Consists of operating income, dividend and affiliate
                     income, net gains on disposal of investments and other
                     income. Amounts for 1996 and 1995 were reclassified in 1997
                     to include dividend and affiliate income and other income,
                     and to conform to other 1997 classifications. See Note 9 to
                     the Consolidated Financial Statements for a discussion of
                     operating income.
               /(b)/ Includes marketing and transportation of domestic natural
                     gas and crude oil, and power generation.
               /(c)/ Includes the portion of the Marathon Group's administrative
                     costs not allocated to the operating components and the
                     portion of USX corporate general and administrative costs
                     allocated to the Marathon Group.
               /(d)/ Reflects adoption of SFAS No. 121, effective October 1,
                     1995. Consists of $(343) million related to Domestic
                     upstream, $(190) million related to International upstream,
                     and $(126) million related to Downstream.

                      AVERAGE VOLUMES AND SELLING PRICES

 
 
                                                                                       1997      1996      1995
               ------------------------------------------------------------------------------------------------------
                                                                                                
               (thousands of barrels per day)
               Net liquids production/(a)/   - U.S.                                      115       122       132
                                             - International/(b)/                         49        59        73
                                                                                     -------   -------   -------
                                             - Worldwide                                 164       181       205
               (millions of cubic feet per day)
               Net natural gas production    - U.S.                                      722       676       634
                                             - International - equity                    423       499       463
                                             - International - other/(c)/                 32        32        35
                                                                                     -------   -------   -------
                                             - Total Consolidated                      1,177     1,207     1,132
                                             - Equity affiliate                           42        45        44
                                                                                     -------   -------   -------
                                             - Worldwide                               1,219     1,252     1,176
               ------------------------------------------------------------------------------------------------------
               (dollars per barrel)
               Liquid hydrocarbons/(a)(d)/   - U.S.                                  $ 16.88   $ 18.58   $ 14.59
                                             - International                           18.77     20.34     16.66
               (dollars per mcf)
               Natural gas/(d)/              - U.S.                                  $  2.20   $  2.09   $  1.63
                                             - International - equity                   2.00      1.97      1.80
               ------------------------------------------------------------------------------------------------------
               (thousands of barrels per day)
               Refined products sold                                                     775       775       747
                 Matching buy/sell volumes included in above                              51        71        47
               ------------------------------------------------------------------------------------------------------


               /(a)/ Includes crude oil, condensate and natural gas liquids.
               /(b)/ Represents equity tanker liftings, truck deliveries and
                     direct deliveries.
               /(c)/ Represents gas acquired for injection and subsequent
                     resale.
               /(d)/ Prices exclude gains/losses from hedging activities.

                                                                            M-31

 
               Management's Discussion and Analysis CONTINUED

                    DOMESTIC UPSTREAM income from operations decreased by $30
               million in 1997 from 1996 following an increase of $224 million
               in 1996 from 1995. The decrease in 1997 was primarily due to
               lower liquid hydrocarbon prices and production and higher
               exploration expense, partially offset by increased natural gas
               production and prices. In addition, results in 1996 included net
               losses of $38 million on production hedging activities (see
               Quantitative and Qualitative Disclosures About Market Risk for
               the Marathon Group for additional details). The lower liquid
               hydrocarbon volumes were mostly due to the fourth quarter 1996
               disposal of oil producing properties in Alaska, while the
               increase in natural gas volumes was mainly attributable to
               properties in east Texas, Oklahoma and Wyoming.

                    The increase in 1996 from 1995 was primarily due to higher
               average liquid hydrocarbon and natural gas prices, reduced DD&A
               expense resulting, in part, from the fourth quarter 1995 adoption
               of SFAS No. 121, and increased natural gas volumes, partially
               offset by lower liquid hydrocarbon volumes, net losses on hedging
               activities, higher exploration expense and an unfavorable
               production tax adjustment for prior years.

                    INTERNATIONAL UPSTREAM income from operations decreased by
               $101 million in 1997 following an increase of $196 million in
               1996. The decrease in 1997 was mainly due to lower liquid
               hydrocarbon liftings, lower natural gas volumes and lower liquid
               hydrocarbon prices. These items were partially offset by reduced
               pipeline and terminal expenses and reduced DD&A expenses, due
               largely to the lower volumes. The lower liquid hydrocarbon
               liftings primarily reflected lower production in the U.K. North
               Sea, while the lower natural gas volumes were mainly due to
               natural field declines in Ireland and Norway.

                    The increase in 1996 from 1995 primarily reflected higher
               average liquid hydrocarbon and natural gas prices, reduced DD&A
               expense resulting, mainly, from property sales and the adoption
               of SFAS No. 121, lower exploration expense and increased natural
               gas volumes, partially offset by lower liquid hydrocarbon
               liftings. Income from operations in 1996 also included a gain on
               the sale of certain production properties in the U.K. North Sea.

                    DOWNSTREAM income from operations increased by $324 million
               in 1997 following a decrease of $35 million in 1996. The increase
               in 1997 was predominantly due to an improvement in refined
               product margins as favorable effects of reduced crude oil and
               other feedstock costs more than offset a decrease in refined
               product sales prices.

                    The decrease in 1996 from 1995 was mainly due to lower
               refined product margins as increases in wholesale and retail
               prices were unable to keep up with the increased costs of
               acquiring crude oil and other feedstocks. In addition, 1996
               results included a $10 million charge for the withdrawal from the
               MPA, a non-profit oil response group, while 1995 results included
               a $15 million favorable noncash adjustment for expected
               environmental remediation recoveries.

                    OTHER ENERGY RELATED BUSINESSES income from operations
               decreased by $29 million in 1997 following an increase of $17
               million in 1996. The decrease in 1997 and the increase in 1996
               were mainly due to a 1996 gain on the sale of an equity interest
               in a domestic pipeline company.

                    In the fourth quarter of 1997, the Marathon Group began
               reporting "Other energy related businesses" as an operating
               category. This category includes income from operations of
               Carnegie Natural Gas Company (formerly reported as "Gas Gathering
               and Processing"), Marathon Power Company, Ltd. and certain
               activities that were excluded from MAP (such as Marathon's
               natural gas and crude oil marketing operations and interests in
               various pipeline companies).

                    ADMINISTRATIVE expenses increased by $35 million in 1997
               following an increase of $51 million in 1996 from 1995. The
               increase in 1997 mainly reflected higher accruals for stock
               appreciation rights and increased accruals for other employee
               benefit and compensation plans, including Marathon's performance-
               based variable pay plan. The increase in 1996 from 1995 primarily
               resulted from a change in the methodology for distributing costs
               of certain administrative services to other operating components.

M-32

 
               Management's Discussion and Analysis CONTINUED

               OUTLOOK

                    The outlook regarding the Marathon Group's sales levels,
               margins and income is largely dependent upon future prices and
               volumes of crude oil, natural gas and refined products. Prices
               have historically been volatile and have frequently been driven
               by unpredictable changes in supply and demand resulting from
               fluctuations in economic activity and political developments in
               the world's major oil and gas producing areas, including OPEC
               member countries. Any substantial decline in such prices could
               have a material adverse effect on the Marathon Group's results of
               operations. A prolonged decline in such prices could also
               adversely affect the quantity of crude oil and natural gas
               reserves that can be economically produced and the amount of
               capital available for exploration and development.

                    With respect to Marathon's upstream operations, worldwide
               liquid hydrocarbon volumes are expected to increase by twenty-
               five percent in 1998, with most of the increase anticipated in
               the second half of the year. This primarily reflects projected
               new production from fields in the Gulf of Mexico (such as Green
               Canyon 244 and Ewing Bank Blocks 963 and 917), the Tchatamba
               Marine field in Gabon and the West Brae field in the U.K. North
               Sea, partially offset by natural production declines of mature
               fields. Marathon's worldwide natural gas volumes in 1998 are
               expected to remain consistent with 1997 volumes at around 1.2
               billion cubic feet per day, as natural declines in mature
               international fields, primarily in Ireland and Norway, are
               anticipated to be offset by increases in domestic production
               (mainly in the Austin Chalk area in Texas, Green Canyon 244 and
               the Vermillion Basin in Wyoming). These projections are based on
               known discoveries and do not include any additions from
               acquisitions or future exploratory drilling.

                    Other major upstream projects, which are currently underway
               or under evaluation and are expected to improve future income
               streams, include Viosca Knoll Block 786 and Green Canyon Blocks
               112 and 113 in the Gulf of Mexico, the Tchatamba South field,
               located offshore Gabon, and the Sakhalin II project in Russia
               (discussed below).

                    The Marathon Group holds a 37.5% interest in Sakhalin
               Energy, an incorporated joint venture company responsible for the
               overall management of the Sakhalin II project. This project
               includes development of the Piltun-Astokhskoye ("P-A") oil field
               and the Lunskoye gas field located offshore Sakhalin Island in
               the Russian Far East Region. During 1997, authorized
               representatives of the Russian Government approved the
               Development Plan for the P-A License Area, Phase 1: Astokh
               Feature. Appraisal work for the remainder of the P-A field was
               also authorized. The P-A full field development plan is scheduled
               to be completed and submitted to the Russian Government by June
               1999. First production of oil from the Astokh Feature, which will
               be developed using an arctic-class drilling vessel called the
               Molikpaq, remains on target for the summer of 1999. Late in 1997,
               the Sakhalin Energy consortium arranged for a limited recourse
               project financing facility of $348 million with a group of
               international financial institutions. Subject to various
               conditions, initial borrowings by Sakhalin Energy under this
               facility are anticipated in 1998 to partially fund Phase 1
               expenditure requirements.

                    Looking at downstream operations, Marathon and Ashland Inc.
               officially formed MAP, which commenced operations on January 1,
               1998. Major elements of both firms' refining, marketing and
               transportation operations were combined, with Marathon having a
               62% ownership interest in MAP and Ashland holding a 38% interest.
               MAP has seven refineries with a combined capacity of 935,000
               barrels per day ("bpd"), 84 light products and asphalt terminals
               in the Midwest and Southeast United States, about 5,400 retail
               marketing outlets in 20 states and significant pipeline holdings.
               Potential efficiencies derived by MAP have been broadly estimated
               to be in excess of $200 million annually on a pretax basis. While
               a modest part of these efficiencies will be achieved in mid- to
               late 1998, full realization of efficiencies should occur over the
               next few years as MAP's integration plans are implemented. In
               conjunction with the formation of MAP, the Marathon Group is
               expected to recognize an estimated $250 million one-time, pretax
               change in interest gain in the first quarter of 1998. For
               additional details of the agreements and the one-time financial
               gain, see Note 28 to the Marathon Group Financial Statements.

                    MAP's refined product sales volumes for 1998 are expected to
               increase slightly from 1997 levels of Marathon's and Ashland's
               separate downstream operations, which were a combined volume of
               approximately 1.2 million bpd. A major maintenance shutdown
               ("turnaround") was completed at the Garyville (La.) refinery in
               early 1998, and major turnarounds are planned for the Canton
               (Ohio) refinery in the fourth quarter of 1998, the Catlettsburg
               (Ky.) refinery in the first quarter of 1999 and the Detroit
               (Mich.) refinery in the fourth quarter of 1999. Each turnaround
               is expected to last about one month.

                                                                            M-33

 
               Management's Discussion and Analysis CONTINUED

                    The above forward-looking statements of projects, expected
               production and sales levels, and dates of initial production are
               based on a number of assumptions, including (among others)
               prices, supply and demand, regulatory constraints, reserve
               estimates, production decline rates for mature fields, reserve
               replacement rates, and geological and operating considerations.
               In addition, development of new production properties in
               countries outside the United States may require protracted
               negotiations with host governments and is frequently subject to
               political considerations, such as tax regulations, which could
               adversely affect the economics of projects. With respect to the
               Sakhalin II project in Russia, Sakhalin Energy continues to seek
               to have certain Russian laws and normative acts at the Russian
               Federation and local levels brought into compliance with the
               existing Production Sharing Agreement Law. To the extent these
               assumptions prove inaccurate and/or negotiations, legal
               developments and other considerations are not satisfactorily
               resolved, actual results could be materially different than
               present expectations.

                    The above discussion also contains forward-looking
               statements with respect to the amount and timing of efficiencies
               to be realized by MAP. Some factors that could potentially cause
               actual results to differ materially from present expectations
               include unanticipated costs to implement shared technology,
               difficulties in integrating corporate structures, delays in
               leveraging volume procurement advantages or delays in personnel
               rationalization.

               YEAR 2000

                    The Marathon Group continues to identify, analyze, modify
               and/or replace non-compliant systems, equipment and other devices
               that utilize date/time-oriented software or computer chips.
               Marathon has contacted all of its vendors from which systems have
               been purchased and has requested that appropriate corrections be
               provided by mid-1998. Modifications to internally developed
               systems are being handled in-house. In addition, during 1997,
               Marathon began including Year 2000 provisions in a variety of its
               contracts. In management's opinion, the incremental costs
               associated with these efforts will not be material to the
               operating results of the Marathon Group.

                    This discussion of Marathon's efforts and management's
               expectations relating to the effect of Year 2000 compliance on
               operating results are forward-looking statements. Actual results
               could be materially different because Marathon's ability to
               achieve Year 2000 compliance and the level of incremental costs
               associated therewith could be adversely affected by unanticipated
               problems identified in the ongoing compliance review. In
               addition, Marathon has limited or no control over comparable
               corrective actions by proprietary software vendors and other
               entities with which it interacts. Therefore, Year 2000 compliance
               problems experienced by these entities could adversely affect the
               operating results of the Marathon Group.

               ACCOUNTING STANDARDS

                    In June 1997, the Financial Accounting Standards Board
               issued two new accounting standards: Statement of Financial
               Accounting Standards No. 130, "Reporting Comprehensive Income"
               requires that companies report all recognized changes in assets
               and liabilities that are not the result of transactions with
               owners, including those that are not reported in net income. USX
               plans to adopt the standard, effective with its 1998 financial
               statements, as required.

                    Statement of Financial Accounting Standards No. 131,
               "Disclosures about Segments of an Enterprise and Related
               Information" introduces a "management approach" for identifying
               reportable industry segments of an enterprise. USX plans to adopt
               the standard, effective with its 1998 financial statements, as
               required.

M-34

 
             The Marathon Group
             Quantitative and Qualitative Disclosures About Market Risk

             MANAGEMENT OPINION CONCERNING DERIVATIVE INSTRUMENTS

                USX employs a strategic approach of limiting its use of
             derivative instruments principally to hedging activities, whereby
             gains and losses are generally offset by price changes in the
             underlying commodity. Based on this approach, combined with risk
             assessment procedures and internal controls, management believes
             that its use of derivative instruments does not expose the Marathon
             Group to material risk. The Marathon Group's use of derivative
             instruments for hedging activities could materially affect the
             Marathon Group's results of operations in particular quarterly or
             annual periods. This is primarily because use of such instruments
             may limit the company's ability to benefit from favorable price
             movements. However, management believes that use of these
             instruments will not have a material adverse effect on financial
             position or liquidity. For a summary of accounting policies related
             to derivative instruments, see Note 2 to the Marathon Group
             Financial Statements.

             COMMODITY PRICE RISK AND RELATED RISKS

                In the normal course of its business, the Marathon Group is
             exposed to market risk, or price fluctuations related to the
             purchase, production or sale of crude oil, natural gas and refined
             products. To a lesser extent, the Marathon Group is exposed to the
             risk of price fluctuations on natural gas liquids, electricity, and
             petroleum feedstocks used as raw materials. The Marathon Group is
             also exposed to effects of price fluctuations on the value of its
             commodity inventories.

                The Marathon Group's market risk strategy has generally been to
             obtain competitive prices for its products and services and allow
             operating results to reflect market price movements dictated by
             supply and demand. However, the Marathon Group uses fixed-price
             contracts and derivative commodity instruments to manage a
             relatively small portion of its commodity price risk. The Marathon
             Group uses fixed-price contracts to manage market risk exposure
             related to the sale of portions of its natural gas production. In
             addition, the Marathon Group uses derivative commodity instruments
             such as exchange-traded futures contracts and options, and over-
             the-counter ("OTC") commodity swaps and options to manage exposure
             related to the purchase, production or sale of crude oil, natural
             gas, refined products and electricity. The Marathon Group's
             strategic approach is to limit the use of these instruments
             principally to hedging activities. Accordingly, gains and losses on
             derivative commodity instruments are generally offset by the
             effects of price changes in the underlying commodity. However,
             certain derivative commodity instruments have the effect of
             restoring the equity portion of fixed-price sales of natural gas to
             variable market-based prices. These instruments are used as part of
             Marathon's overall risk management programs.

                                                                            M-35

 
             Quantitative and Qualitative Disclosures
             About Market Risk CONTINUED

                Sensitivity analyses of the incremental effects on pretax income
             of hypothetical 10% and 25% changes in commodity prices for open
             derivative commodity instruments for the Marathon Group as of
             December 31, 1997, are provided in the following table:/(a)/



             (Dollars in millions)
             --------------------------------------------------------------------------------
                                                                    INCREMENTAL DECREASE IN
                                                                   PRETAX INCOME ASSUMING A
                                                          HYPOTHETICAL PRICE CHANGE OF/(a)/
             Derivative Commodity Instruments                        10%     25%
             --------------------------------------------------------------------------------
                                                                          
              Crude oil (price increase)/(b)/                        $2.7    $ 8.6   
               Natural gas (price decrease)/(b)/                      2.9      7.1 
              Refined products (price decrease)/(b)/                   .4      1.1
                                                                     ----    -----
               Total                                                 $6.0    $16.8
             --------------------------------------------------------------------------------


             /(a)/ Gains and losses on derivative commodity instruments are
                   generally offset by price changes in the underlying
                   commodity. Effects of these offsets are not reflected in the
                   sensitivity analyses. Amounts reflect the estimated
                   incremental effect on pretax income of hypothetical 10% and
                   25% changes in closing commodity prices for each open
                   contract position at December 31, 1997. The Marathon Group
                   evaluates its portfolio of derivative commodity instruments
                   on an ongoing basis and adds or revises strategies to reflect
                   anticipated market conditions and changes in risk profiles.
                   Changes to the size or composition of the portfolio
                   subsequent to December 31, 1997, would cause future pretax
                   income effects to differ from those presented in the table.

                   The number of net open contracts varied throughout 1997, from
                   a low of 637 contracts at December 31, to a high of 9,307
                   contracts at June 11, and averaged 5,400 for the year. The
                   derivative commodity instruments used and hedging positions
                   taken also varied throughout 1997, and will continue to vary
                   in the future. Because of these variations in the composition
                   of the portfolio over time, the number of open contracts, by
                   itself, cannot be used to predict future income effects.
                   During 1998, the size of the portfolio is expected to
                   increase above average 1997 levels as a result of increased
                   volumes for Marathon Ashland Petroleum LLC, on a basis
                   consistent with guidelines established in previously existing
                   downstream hedging programs.

                   The calculation of sensitivity amounts for basis swaps
                   assumes that the physical and paper indices are perfectly
                   correlated. Gains and losses on options are based on the
                   difference between the strike price and the underlying
                   commodity price.

             /(b)/ The direction of the price change used in calculating the
                   sensitivity amount for each commodity reflects that which
                   would result in the largest incremental decrease in pretax
                   income when applied to the derivative commodity instruments
                   used to hedge that commodity.

                   While derivative commodity instruments are generally used to
             reduce risks from unfavorable commodity price movements, they also
             may limit the opportunity to benefit from favorable movements.
             During the fourth quarter of 1996, certain hedging strategies
             matured which limited the Marathon Group's ability to benefit from
             favorable market price increases on the sales of equity crude oil
             and natural gas production, resulting in pretax hedging losses of
             $33 million. In total, Marathon's upstream operations recorded
             pretax hedging losses of $3 million in 1997, compared with net
             losses of $38 million in 1996, and net gains of $10 million in
             1995.

                   Marathon's downstream operations generally use derivative
             commodity instruments to lock-in costs of certain raw material
             purchases, to protect carrying values of inventories and to protect
             margins on fixed-price sales of refined products. In total,
             downstream operations recorded net pretax hedging gains of $29
             million in 1997, compared with net losses of $22 million in 1996
             and $4 million in 1995. Essentially, all of these upstream and
             downstream gains and losses were offset by changes in the prices of
             the underlying hedged commodities, with the net effect
             approximating the targeted results of the hedging strategies. For
             additional information relating to derivative commodity
             instruments, including aggregate contract values, and fair values,
             where appropriate, see Note 25 to the Marathon Group Financial
             Statements.

                   The Marathon Group is subject to basis risk, caused by
             factors that affect the relationship between commodity futures
             prices reflected in derivative commodity instruments and the cash
             market price of the underlying commodity. Natural gas transaction
             prices are frequently based on industry reference prices that may
             vary from prices experienced in local markets. For example, New
             York Mercantile Exchange ("NYMEX") contracts for natural gas are
             priced at Louisiana's Henry Hub, while the underlying quantities of
             natural gas may be produced and sold in the Western United States
             at prices that do not move in strict correlation with NYMEX prices.
             To the extent that commodity price changes

M-36

 
             Quantitative and Qualitative Disclosures
             About Market Risk CONTINUED
 
             in one region are not reflected in other regions, derivative
             commodity instruments may no longer provide the expected hedge,
             resulting in increased exposure to basis risk. These regional price
             differences could yield favorable or unfavorable results. OTC
             transactions are being used to manage exposure to most of the basis
             risk.

                The Marathon Group is subject to liquidity risk, caused by
             timing delays in liquidating contract positions due to a potential
             inability to identify a counterparty willing to accept an
             offsetting position. Due to the large number of active
             participants, exposure to liquidity risk is relatively low for
             exchange-traded transactions.

             INTEREST RATE RISK

                USX is subject to the effects of interest rate fluctuations on
             certain of its non-derivative financial instruments. A sensitivity
             analysis of the projected incremental effect of a hypothetical 10%
             decrease in year-end 1997 interest rates on the fair value of the
             Marathon Group's specifically attributed non-derivative financial
             instruments and the Marathon Group's portion of USX's non-
             derivative financial instruments attributed to all groups, is
             provided in the following table:



            (Dollars in millions)
            ---------------------------------------------------------------------------------------------------------
                                                                                                         Incremental
                                                                                                         Increase in
                                                                            Carrying       Fair              Fair
            Non-Derivative Financial Instruments/(a)/                      Value /(b)/   Value /(b)/      Value /(c)/
            --------------------------------------------------------------------------------------------------------- 
                                                                                                    
            Financial assets:
            Investments and long-term receivables/(d)/                         $   86        $  143          $    --
            --------------------------------------------------------------------------------------------------------- 
            Financial liabilities:
            Long-term debt (including amounts due within one year)/(e)/        $2,869        $3,198          $   106
            Preferred stock of subsidiary/(f)/                                    184           187               18
                                                                                -----         -----          -------
            Total                                                              $3,053        $3,385          $   124
            ---------------------------------------------------------------------------------------------------------


            /(a)/  Fair values of cash and cash equivalents, receivables, notes
                   payable, accounts payable and accrued interest, approximate
                   carrying value and are relatively insensitive to changes in
                   interest rates due to the short-term maturity of the
                   instruments. Accordingly, these instruments are excluded from
                   the table.
            /(b)/  At December 31, 1997. For further discussion, see Note 26 to
                   the Marathon Group Financial Statements.
            /(c)/  Reflects, by class of financial instrument, the estimated
                   incremental effect of a hypothetical 10% decrease in interest
                   rates at December 31, 1997, on the fair value of non-
                   derivative financial instruments. For financial liabilities
                   this assumes a 10% decrease in the weighted average yield to
                   maturity of USX's long-term debt at December 31, 1997.
            /(d)/  For additional information, see Note 19 to the Marathon
                   Group Financial Statements.
            /(e)/  Fair value was based on market prices where available, or
                   current borrowing rates for financings with similar terms
                   and maturities. For additional information, see Note 11 to
                   the Marathon Group Financial Statements.
            /(f)/  In 1994, USX Capital LLC, a wholly owned subsidiary of USX,
                   sold 10,000,000 shares of 8-3/4% Cumulative Monthly Income
                   Preferred Shares. For further discussion, see Note 25 to
                   the Consolidated Financial Statements.

                   At December 31, 1997, USX's portfolio of long-term debt was
            comprised primarily of fixed-rate instruments. Therefore, the fair
            value of the portfolio is relatively sensitive to effects of
            interest rate fluctuations. This sensitivity is illustrated by the
            $106 million increase in the fair value of long-term debt assuming a
            hypothetical 10% decrease in interest rates. However, USX's
            sensitivity to interest rate declines and corresponding increases in
            the fair value of its debt portfolio would unfavorably affect USX's
            results and cash flows only to the extent that USX elected to
            repurchase or otherwise retire all or a portion of its fixed-rate
            debt portfolio at prices above carrying value.

            FOREIGN CURRENCY EXCHANGE RATE RISK

                   The Marathon Group is subject to the risk of price
            fluctuations related to anticipated revenues and operating costs,
            firm commitments for capital expenditures and existing assets or
            liabilities denominated in currencies other than U.S. dollars. USX
            has not generally used derivative instruments to manage this risk.
            However, USX has made limited use of forward currency contracts to
            manage exposure to certain currency price fluctuations. At December
            31, 1997, a forward currency contract with a fair value of $10
            million was outstanding. The Marathon Group's attributed portion of
            the contract was $9 million. This contract hedges exposure to
            currency price fluctuations relating to a Swiss franc debt
            obligation with a fair value of $69 million at December 31, 1997.
            The debt obligation and forward contract mature in 1998.
            
                                                                            M-37

 
             Quantitative and Qualitative Disclosures
             About Market Risk CONTINUED


             EQUITY PRICE RISK

                The Marathon Group holds investments in common stock and
             warrants of certain third parties. The fair value of these
             investments ($17 million at December 31, 1997) has not been
             material.

             SAFE HARBOR

                The Marathon Group's quantitative and qualitative disclosures
             about market risk include forward-looking statements as defined in
             the Private Securities Litigation Reform Act of 1995. These
             statements are accompanied by cautionary language identifying
             important factors (particularly the underlying assumptions and
             limitations disclosed in footnotes to the tables), though not
             necessarily all such factors, that could cause future outcomes to
             differ materially from those projected.

                Forward-looking statements with respect to management's opinion
             about risks associated with USX's use of derivative instruments,
             and projected increases in the size of the Marathon Group's hedge
             portfolio are based on certain assumptions with respect to market
             prices and industry supply of and demand for crude oil, refined
             products and certain raw materials. To the extent that these
             assumptions prove to be inaccurate, future outcomes with respect to
             the Marathon Group's hedging programs may differ materially from
             those discussed in the forward-looking statements.


M-38