This excerpt taken from the MRO 8-K filed Nov 5, 2007.
Cautionary Note to U.S. Investors - The United States Securities and Exchange Commission (SEC) permits oil and gas companies, in their filings with the SEC, to disclose only proved reserves that a company has demonstrated by actual production or conclusive formation tests to be economically and legally producible under existing economic and operating conditions. SEC regulations classify mined bitumen as mining-related and not part of conventional oil and natural gas reserves. Marathon Oil Corporation uses certain terms in this press release, such as net resource, that the SECs guidelines strictly prohibit us from including in filings with the SEC. U.S. Investors are urged to consider closely the disclosures in Marathons periodic filings with the SEC, available from the Company at 5555 San Felipe Road, Houston, Texas 77056 and the Companys Web site at http://www.Marathon.com. You can also obtain this information from the SEC by calling 1-800-SEC-0330.