Exhibit 99.1.

Marathon continues international growth strategy: announces plans to acquire CMS
                   interests in Equatorial Guinea, West Africa

Houston, November 2, 2001 - Marathon Oil Company (NYSE:MRO) announced today that
it  has  signed a Purchase and Sale Agreement with CMS Energy to acquire all  of
its  upstream and downstream interests in Equatorial Guinea, West  Africa.   The
acquisition  is  part  of  Marathon's plans for profitable  growth  through  the
creation of a number of new core business areas.

Through this transaction Marathon will acquire:
-    52.4%  interest in, and operatorship of, the offshore Alba Block,  which
     contains the currently producing Alba gas field as well as undeveloped oil
     and gas discoveries, and several undrilled exploration prospects;
-    37.6% interest in the adjacent offshore Block D;
-    52.4% interest in a condensate separation facility, onshore Bioko Island;
-    45% interest in a joint venture onshore methanol production plant; and
-    43.2% interest in an onshore Liquefied Petroleum Gas (LPG) processing
     plant.

The   total  cash  consideration  of  this  acquisition  is  $993  million.  The
transaction  is subject to appropriate government approvals and is  expected  to
close in early January 2002.

The  Alba  field,  which  began producing in 1991, is  estimated  to  contain  a
producible resource of 5 trillion cubic feet of dry gas and 300 million  barrels
of  condensate.  Currently, 230 million cubic feet per day (mmcfd) gross of  wet
gas  is  produced,  from which approximately 17,000 barrels  per  day  gross  of
condensate and 2,400 barrels per day gross of LPG are recovered through  process
facilities on Bioko Island. Approximately 115 mmcfd of the remaining lean gas is
then  fed to the methanol plant.  Marathon's net share of production is expected
to average almost 18,000 barrels of oil equivalent per day (BOE/d) in 2002.

Plans  have been submitted to increase gross production to about 800  mmcfd  and
expand the condensate recovery and LPG facilities to significantly increase  the
liquids   processing  capabilities.   This  should  result  in  Marathon's   net
production  increasing to 35,000 - 40,000 BOE/d by 2004.  Expansion  plans  will
require approval by the host government and other venture participants.

Marathon's  net  reserves  associated with this acquisition  total  142  million
barrels  of liquids and 646 billion cubic feet of gas, or 250 million  BOE.   Of
this  total, approximately 183 million BOE of proven reserves will be booked  on
closing  with  the  remainder  on  securing the appropriate  approvals  for  the
expansion  project in early 2002.  Based on the 250 million BOE  reserve  level,
the  cash  acquisition  cost  is $3.97 per BOE.  By including  $327  million  of
anticipated future development costs, the full cycle acquisition and development
costs is a very competitive $5.28 /BOE.

Significant incremental potential value exists in commercializing the  remaining
dry  gas reserves.  Marathon sees great promise in known technologies that could
allow this gas, and future opportunities, to be commercialized.

"This acquisition will establish a new core business area for Marathon and is  a
great  fit  with our strategy of acquiring profitable growth opportunities  that
add  substantial value, provide immediate cash flow and have significant  upside
potential", said Marathon president, Clarence Cazalot. "Furthermore, this is  an
important  new step in growing our integrated gas business where the application
of  gas  commercialization  technologies will deliver added-value  products  for
local,  U.S.  and  European  markets.  I see  Marathon  becoming  a  significant
regional  player in West Africa as we build on our expertise across  the  energy
value  chain and the relationships we have already established in this  part  of
the world."

Salomon Smith Barney Inc., served as advisor to Marathon on the transaction.

Marathon Oil Company, part of the USX-Marathon Group (NYSE: MRO) and a unit of
USX Corporation, is a large fully integrated oil firm engaged in the worldwide
exploration and production of crude oil and natural gas. Through Marathon
Ashland Petroleum LLC, the Company also refines, markets and transports
petroleum products in the United States.

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This  release contains forward-looking statements with respect to completion  of
the  acquisition,  estimated  proven reserves,  potential  additional  reserves,
estimated future production rates and the presently expected development  costs.
This  forward-looking  information is based on certain  assumptions,  including,
among  others,  presently known physical data concerning size and  character  of
reservoirs,  economic  recoverability, technology development,  future  drilling
success, production experience, industry economic conditions (such as supply and
demand),  levels of company cash flow from operations and operating  conditions.
This  forward looking information may prove to be inaccurate and actual  results
may  differ significantly from those presently anticipated.  In accordance  with
"safe  harbor"  provisions of the Private Securities Litigation  Reform  Act  of
1995,  USX  has  included  in its Annual Report Form 10-K  for  the  year  ended
December 31, 2000, as amended by Forms 10-K/A, and in subsequent Forms 10-Q  and
8-K,  cautionary  language  identifying  other  important  factors,  though  not
necessarily these such factors, that could cause future outcomes to differ  from
those set forth in forward-looking statements.