The Peninsula of Lower California forms a geographical and geological unit which extends south of the westernmost limit of the Mexican-U. S. border.

Granite outcrops in most of the northern part of the Peninsula, but there are narrow belts of sedimentary rocks, of Tertiary and Cretaceous age, which do not present oil possibilities (the Cretaceous rocks show, in general, metamorphism of varying degree).

South of the 28th parallel, which crosses the Sebastian Vizcaino Gulf, most of the area is covered by volcanic rocks, mainly pyroclastics, but a well defined geosyncline is found on the western part of the Peninsula, with important developments of marine sedimentary rocks of Tertiary and Cretaceous age.

Based on the existence of these marine sediments, the oil and gas possibilities of the Peninsula have been studied, but no oil or gas seepages have been found, and although a total of 13 wells with depths ranging from 1,400 to 9,500 feet have been drilled, only one had important gas shows.

Present status does not encourage an intensive exploration program, but it is believed that more work will be done when other areas, with better oil or gas prospects, begin their decline.

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