Contact:  William E. Keslar
                                        (412) 433-6870

FOR IMMEDIATE RELEASE

     PITTSBURGH, March 2 - USX Chairman and Chief Executive Officer Thomas J.
Usher announced today that the board of directors has elected Clarence P.
Cazalot, Jr. president of Marathon Oil Company.  He also was named a vice-
chairman of USX Corporation and elected to the USX board.
     Cazalot, 49, had been vice president of Texaco Inc. and president -
production operations.
     Usher emphasized in his announcement that Cazalot's breadth of experience
in all phases of the oil and gas business will serve Marathon Oil well during
this highly competitive era.  "Clarence has solid leadership skills and broad
industry experience that will help Marathon reach its stated goal of future
growth on a worldwide basis," Usher declared.
     In accepting his new post with Marathon, Cazalot said, "I'm pleased to be
joining a company with such a great reputation.  Marathon is a world class oil
company with great potential to grow and prosper.  I look forward to working
with Marathon's fine management team to take the company to the next level of
success."
     Cazalot is a native of New Orleans and was graduated from Louisiana State
University with a degree in geology.  He joined Texaco in Bellaire, Texas in
1972 as a geophysicist.  He transferred to the offshore division in New Orleans
in 1974.  He held a number of posts there before being named assistant district
geologist in 1976, district geologist in 1977, assistant division geologist in
1979 and regional manager of exploration in 1981.
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     He was appointed staff geologist for the exploration and producing
executive committee of Texaco Inc. at the executive offices in Harrison, N.Y. in
1984.  The following year, he was named assistant to the vice-chairman.  He was
named general manager of the frontier exploration department in 1987 in
Bellaire, Texas.  He was elected a vice president of Texaco Inc. and president
of Texaco's Latin America/West Africa Division based in Coral Gables, Florida in
early 1992.
     In 1994, Cazalot was named president of Texaco Exploration and Production
Inc., in Houston.  He was named to the position of president of international
marketing and manufacturing on January 1, 1997.  He was named president -
international production and chairman of London-based Texaco Ltd. on January 1,
1998.  He moved to his latest post in White Plains, N. Y. in January 1999.
     Houston-based Marathon Oil Company is part of the USX-Marathon Group (NYSE:
MRO), a unit of USX Corporation.
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2000-3-2
     Visit our Websites located at www.usx.com or www.marathon.com.