Marathon Group Conference Call Available on Company Web Site

USX-Marathon Group (NYSE: MRO) announced that interested shareholders, investors and others may listen to the company's fourth quarter conference call with securities analysts on Wednesday, January 24, at 10 a.m. EST on the USX Corporation web site. The call will cover fourth quarter financial results and may include forward-looking information.

Kenneth L. Matheny, vice president -- Investor Relations for USX Corporation, will host the call. Also participating in the call will be Clarence P. Cazalot, Jr., president of Marathon Oil Company; John T. Mills, senior vice president, Finance & Administration for Marathon; John P. Surma, president of Marathon Ashland Petroleum LLC (MAP); and Garry L. Peiffer, senior vice president, Finance and Information Technology for MAP.

Interested parties can visit the web site at http://www.usx.com/ and click on the "Marathon Group" button, then the "Investor Services" button.

Replays of the conference call will be available on the USX web site until February 1.

Financial information, including earnings releases and other investor-related material, is also available at the site.

USX Corporation press releases are available through Company News On-Call by fax, 800-758-5804, ext. 929150, or at http://www.prnewswire.com/comp/929150.html; or by fax, 800-758-5804, ext. 133204, or at http://www.prnewswire.com/comp/133204.html.

SOURCE: USX-Marathon Group

Contact: William E. Keslar or Don H. Herring, of USX, 412-433-6870

Website: http://www.usx.com/

Company News On-Call: http://www.prnewswire.com/comp/929150.html or fax,
800-758-5804, ext. 929150; or by fax, 800-758-5804, ext. 133204, or at
http://www.prnewswire.com/comp/133204.html