. Oil and gas yielding formations of California. z. It is well exposed at San Juan Point, whence it can betraced in a northwesterly direction. It is said that the Sea Lion rocks,near San Mateo Point, are composed of a similar formation. Resting with probable non-conformability on this conglomerate is awhitish sandstone resembling the whitish sandstone seen in SantiagoCanon, and containing fossils which are considered of Lower Neoceneage by Dr. Merriam. This sandstone is exposed near the San Mateoand San Juan points (see Photo No. 13); it forms the great mass of theSan Joaquin Hills, as is show
. Oil and gas yielding formations of California. z. It is well exposed at San Juan Point, whence it can betraced in a northwesterly direction. It is said that the Sea Lion rocks,near San Mateo Point, are composed of a similar formation. Resting with probable non-conformability on this conglomerate is awhitish sandstone resembling the whitish sandstone seen in SantiagoCanon, and containing fossils which are considered of Lower Neoceneage by Dr. Merriam. This sandstone is exposed near the San Mateoand San Juan points (see Photo No. 13); it forms the great mass of theSan Joaquin Hills, as is shown on Fig. F. Resting on this sandstone is a widely extending formation of many places this shale has a purplish color, and some of it whenheated gives out a faint odor of petroleum. The upper portion of thisformation is interstratified with thin-bedded sandy strata; the shalepasses into a tough clay, yellowish at the surface, but probably of bluishcolor at no great depth. The central portion of this formation is tough shale. The lowest. PHOTO 13. Sandstone Formation on Shore-Line, Orange County. .^ic^BKCasy
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