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                                                                   EXHIBIT 10(a)

      THIS DOCUMENT CONSTITUTES PART OF A PROSPECTUS COVERING SECURITIES
          THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933

                   MARATHON OIL CORPORATION 1990 STOCK PLAN,
              (As Amended and Restated Effective January 1, 2002)

  1. Objectives.  The Marathon Oil Corporation 1990 Stock Plan, formerly named
the USX Corporation 1990 Stock Plan (the "Plan"), is designed:

       (a) to promote the long-term financial interests and growth of the
  Corporation and subsidiaries by attracting and retaining management personnel
  with the training, experience and ability to enable them to make a substantial
  contribution to the success of the Corporation's businesses;

       (b) to motivate management personnel by means of growth-related
  incentives to achieve long-range growth goals; and

       (c) to further the identity of interests of participants with those of
  the stockholders of the Corporation through opportunities for increased stock
  ownership in the Corporation.

  2. Definitions.

       (a) Board.  The Board of Directors of Marathon Oil Corporation;

       (b) Committee.  The Compensation & Organization Committee of the Board of
  Directors of Marathon Oil Corporation, which will consist of not less than
  three directors of the Corporation who are appointed by the Board of Directors
  and who will satisfy the definition of "non-employee director" under Rule 16b-
  3 promulgated under the Securities Exchange Act of 1934 or any successor rule.
  In addition, in order to be a member of the Committee, a director must be an
  "outside director" within the meaning of Section 162(m) of the Internal
  Revenue Code of 1986, as amended (the "Code"), and the regulations thereunder;

       (c) Corporation.  Marathon Oil Corporation, formerly named USX
  Corporation, (MOC) and its (1) wholly-owned and partially-owned subsidiaries
  including limited liability companies ("Subsidiaries") and wholly-owned and
  partially-owned subsidiaries, direct and indirect, of Subsidiaries, and (2)
  joint ventures included within MOC or any entity described in (1) above;

       (d) Fair Market Value.  Such value of a Share as reported for stock
  exchange transactions and determined in accordance with any applicable
  resolutions or regulations of the Committee in effect at the relevant time;

       (e) Grant.  A Grant made under the Plan to a Participant in the form of
  an Option, Restored Option, Stock Appreciation Right or Restricted Stock or
  any combination thereof;

       (f)  Marathon Stock.  Marathon Oil Corporation Common Stock, par value
  $1.00;
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       (g) Participant.  An employee of the Corporation to whom a Grant is made;
  and

       (h) Share.  A share of Marathon Stock, which may be authorized but
  unissued or issued and reacquired.

  3. Eligibility.  Employees of the Corporation eligible for a Grant under the
Plan are all executive officers and others in responsible positions whose
performance, in the judgment of the Committee, affects the Corporation's
success.

  4. Administration.  The Plan shall be administered by the Committee in
accordance with Rule 16b-3 promulgated under the Securities Exchange Act of 1934
or any successor rule.  The Committee shall determine the type or types of
Grants to be made to each Participant and shall set forth in such Grant the
terms, conditions and limitations applicable to it, including provisions
relating to change in control of the Corporation.  Grants may be made singly, in
combination or in tandem.  The Committee shall have full and exclusive power to
interpret the Plan, to adopt rules, regulations and guidelines relating to the
Plan, to grant waivers of Plan restrictions, other than the restrictions
described in Paragraph 10, and to make all of the determinations necessary for
its administration.

  5. Shares Subject to the Plan.  Up to 0.5% of the outstanding Marathon Stock,
as determined on December 31 of the preceding year, shall be available for
Grants during each calendar year in which the Plan is in effect.  In addition,
Shares related to Grants that are forfeited, terminated, cancelled, expire
unexercised, settled in cash in lieu of stock or in such manner that all or some
of the Shares covered by a Grant are not issued to a Participant shall
immediately become available for Grants, and these Shares, as well as any unused
portion of the percentage limit of Shares in any calendar year, shall be carried
forward and available for Grants in succeeding calendar years.  During any
calendar year, no Participant shall be awarded Grants pursuant to Paragraphs 7,
8, 9 and 10 hereof with respect to more than 500,000 Shares of stock.

  6. Delegation of Authority.  The Committee may delegate to the Stock Option
Officer and to other senior officers of the Corporation its duties under the
Plan subject to such conditions and limitations as the Committee shall prescribe
except that only the Committee may designate and make Grants to Participants who
are subject to Section 16 of the Securities Exchange Act of 1934.

  7. Option.  A right to purchase a specified number of Shares at not less than
100% of Fair Market Value on the date of the Grant.  All Options will be Non-
Qualified Options.  Full payment for Shares purchased shall be made at the time
of the exercise of the Option, in whole or in part.  Payment of the purchase
price shall be made in cash or in such other form as the Committee may approve,
including Shares valued at the Fair Market Value of the Shares on the date of
exercising the Option.  No option shall have a term exceeding ten years from the
date of grant or be exercisable prior to the expiration of one year from the
date of grant, and no option shall be repriced except as provided for in
Paragraph 12.
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  8. Restored Option.  An option issued as a result of the exercise of an option
for which the purchase price is paid wholly in previously owned Shares of the
class of stock of the underlying option.  Upon such an exercise, a Restored
Option shall be granted with respect to Shares of the class of stock of the
underlying option, equal to the number of Shares actually used to exercise the
underlying option or portion thereof plus any Shares withheld for the payment of
taxes.  A Restored Option (1) shall have an option price equal to the Fair
Market Value of the class of stock of the underlying option on the date of
exercise, (2) shall have the same expiration date as the underlying option and
(3) shall not be exercisable prior to the expiration of one year from the date
of grant.  Grants and exercises of Restored Options shall be subject to such
other restrictions as shall be determined by the Committee.

  9. Stock Appreciation Right.  A right to receive a payment in cash and/or
Shares equal to the excess of the Fair Market Value of a Share on the date the
Stock Appreciation Right (SAR) is exercised over the Fair Market Value of a
Share at the date of the SAR Grant for a specified number of Shares; provided,
that for any SAR exercised during the 10-business-day period beginning on the
third business day following the release of MOC's quarterly earnings, the
Committee may, in its sole discretion, establish a uniform Fair Market Value of
a Share for such period which shall not be more than the highest daily Fair
Market Value and shall not be less than the lowest daily Fair Market Value
during such 10-business-day period.  No Stock Appreciation Right shall be
exercisable prior to the expiration of one year from the date of grant.
"Business day" shall mean all calendar days except Saturdays, Sundays and
national holidays.

  10.  Restricted Stock.  An award of Shares for no cash consideration, if
permitted by applicable law, or for such other consideration as determined by
the Committee.  Each award shall be subject to: the condition that the
Participant's continuous service with the Corporation continue for at least one
year following the date of such award; vesting restrictions based on achievement
of business objectives, Corporation performance and other criteria; and
provisions for forfeiture and non-transfer.  Subject to such forfeiture and
transfer restriction provisions as may be established by the Committee, any
Participant receiving an award shall have all the rights of a stockholder of the
Corporation with respect to Shares of Restricted Stock, including the right to
vote the Shares and the right to receive any cash dividends thereon.  During the
period January 1, 1998 through May 31, 2005, the number of Shares of Restricted
Stock granted shall not exceed 1,200,000.

   Each award of Restricted Stock under this Plan shall remain unvested until
the Committee vests the Shares based upon the specific performance measures
outlined in the table below.  The Committee has the authority to adopt, in
accordance with regulations established under the Code, applicable target levels
under these performance measures and the percentage of Restricted Stock to be
vested for attaining these target levels.  The Committee reserves the
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right to reduce the percentage of Restricted Shares to be vested for a
Participant.  Shares of Restricted Stock under this Plan will be vested only
after the Committee certifies in writing that the applicable performance
measures have been satisfied.  No Shares of Restricted Stock shall be vested
prior to the expiration of one year from the date of grant.  In the case of a
change in control of the Corporation, all restrictions shall terminate.

Earnings before interest, taxes and depreciation as % of total assets
Oil and gas reserve replacement ratio
Upstream - Income per barrel of oil equivalent produced
Downstream - Operating income per barrel of refinery throughput
Safety performance

  11.  Transfer.  No Grant may be assigned, pledged or transferred other than by
will or by the laws of descent and distribution and during a Participant's
lifetime shall be exercisable only by the Participant or his or her guardian or
legal representative.

  12.  Adjustments.  In the event of any change in the outstanding common stock
of MOC by reason of a stock split, stock dividend, stock combination or
reclassification, recapitalization or merger, or similar event, the Committee
may adjust appropriately the number of Shares available for or covered by Grants
and Share prices related to outstanding Grants and make such other revisions to
outstanding Grants as it deems are equitably required.

   The number of Shares covered by Options and Restored Options unexercised on
December 31, 2001 and/or their exercise prices will be adjusted by the
Committee, if necessary, so that (i) the aggregate intrinsic value of the
Options and Restored Options on January 1, 2002 is not greater than the
aggregate intrinsic value of the Options and Restored Options immediately before
January 1, 2002, and (ii) the ratio of the exercise price per share to the
market value per share is not reduced.  Any such adjustments will be based on
the closing price per share of Shares (then trading as USX-Marathon Group Common
Stock) on the last trading day before January 1, 2002 relative to the opening
price per share of Shares on the next trading day.

  13.  Tax Withholding.  The Corporation shall have the right to deduct
applicable taxes from any cash payment under this Plan which are required to be
withheld and further to condition the obligation to deliver or the vesting of
Shares under this Plan upon the Participant paying MOC such amount as it may
request to satisfy any liability for applicable withholding taxes.  Participants
may elect to have MOC withhold Shares to satisfy all or part of their
withholding liability in the manner and to the extent provided for by the
Committee at the time of such election.
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  14.  Amendments.  The Committee shall have the authority to make such
amendments to any terms and conditions applicable to outstanding Grants as are
consistent with this Plan provided that, except for adjustments under Paragraph
12 hereof, no such action shall modify such Grant in a manner adverse to the
Participant without the Participant's consent except as such modification is
provided for or contemplated in the terms of the Grant.

  The Board may amend, suspend or terminate the Plan except that no such action
may be taken (other than as provided in Paragraph 12) which would, without
stockholder approval, increase the aggregate number of Shares available for
Grants under the Plan; decrease the price of Options, Restored Options or SARs;
change the requirements relating to the Committee; or extend the term of the
Plan.

  15.  Effective and Termination Dates.  The Plan became effective on May 7,
1990, the date it was approved by the stockholders, and shall terminate on May
31, 2005, subject to earlier termination by the Board pursuant to Paragraph 14.<PAGE>

                                                                   EXHIBIT 10(b)

                            MARATHON OIL CORPORATION
                       ANNUAL INCENTIVE COMPENSATION PLAN
                     (As Amended Effective January 1, 2002)

1.   Purpose of the Plan

     The objectives of the Plan, formerly named the USX Corporation Annual
     Incentive Compensation Plan, are to advance the interests of the
     Corporation and its shareholders by providing officers and key employees
     incentive opportunities in order that the Corporation might attract, retain
     and motivate outstanding personnel by:

     a)   providing compensation opportunities which are competitive with those
          of other major corporations of comparable size and in similar
          businesses;

     b)   supporting the Corporation's goal-setting and strategic planning
          process; and

     c)   motivating officers and key employees to achieve annual business goals
          and contribute to team performance by allowing them to share in the
          risks and rewards of the business.

2.   Administration

     This Plan shall be administered by the Compensation and Organization
     Committee of the Board of Directors, which shall consist of not less than
     three directors of the Corporation who are appointed by the Board of
     Directors and who shall not be, and shall not have been, an officer or an
     employee of the Corporation.  The Committee is authorized to interpret the
     Plan, to prescribe, amend and rescind rules and regulations relating to it,
     to delegate the granting of awards pursuant to guidelines established from
     time to time by the Committee, and to make all other determinations
     necessary for its administration.

3.   Eligibility for Participation

     Employees of the Corporation eligible to receive incentive compensation
     under the Plan are those in responsible positions whose performance may
     affect the Corporation's success.  Participants shall include employees of
     the Corporation and any subsidiary and/or joint venture if such employees
     are specifically designated as participants.

4.   Amount Available for Plan

     The Board of Directors, upon the recommendation of the Committee, shall
     determine the aggregate amount which may be awarded with respect to each
     year.
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5.   Awards

     Within the limits of the Plan, annual incentive awards stated in dollars
     may be made to any or all eligible participants.  Determinations as to
     participation and award level shall be made on the basis of the positions,
     responsibilities and accomplishments of the eligible employees; the
     performance of the respective individuals, divisions, departments and
     subsidiaries of the Corporation; the overall performance and best interests
     of the Corporation; the recommendations of the Chairman; and other
     pertinent factors; such factors to be given such weight as is deemed
     appropriate.  The guidelines established by the Committee shall provide
     that no participant shall have an annual target award in excess of 150% of
     his annual base salary; any exceptions to this limit shall be specifically
     approved by the Committee.  If a participant retires during the year with
     respect to which awards are made, the Committee may grant him an award, but
     it shall be prorated based on the number of months of active employment.
     If a participant dies during the year, the Committee may grant a prorated
     award to the employee's estate.

6.   Payment of Awards

     In its discretion, the Committee may permit participants in the Plan to
     defer the receipt of all or any part of any award granted under the Plan
     for such period and under such conditions as the Committee may determine,
     including the payment of interest on deferred awards if the Committee so
     determines.  Unless receipt is deferred, all awards will be paid in cash as
     soon as practicable following the grant.  An award will be considered as
     part of "gross pay" for purposes of calculation of benefits under the
     respective retirement and thrift plans unless the award is paid after a
     participant retires.  No award will be paid to a person who quits or is
     discharged prior to payment of the award.

7    Effective Date; Amendment, Suspension or Termination of the Plan

     This Plan became effective as of January 1, 1984.

     The Board of Directors may, from time to time, amend, suspend or terminate
     the Plan in whole or in part.  If it is suspended or terminated, the Board
     of Directors may reinstate any or all of the provisions of the Plan.

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