Marine Petroleum Trust, a royalty trust, holds title to interests in properties situated in the Gulf of Mexico. Its rights entitle the company to receive a .0075 overriding royalty interest in oil, natural gas, and other mineral leasehold interests acquired by Gulf Oil Corporation, now Chevron U.S.A., Inc. The company also owns a 32.6% equity interest in Tidelands Royalty Trust ‘B’, a Texas trust, which owns interests in the oil, natural gas, or other mineral leases acquired by Gulf Oil Corporation and/or its transferees and assignees in a 1,370,000-acre area of the Gulf of Mexico. Marine Petroleum Trust was founded in 1956 and is based in Dallas, Texas.