. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. (Coarse, heavy-bedded brown arkose sandstone inter-bedded with minor quantities of argillaceous and sili-ceous shale, the shale being relatively more abundanttoward the top and bottom of the formation. Totalthickness unknown. Basement complex of diorite and other granitic rocks andgneiss, associated with an extensive dark-colored mica-ceous schist. Fig. 12. Generalized geologic section for the immediate vicinity of the Los Angeles oil fields 1. GEOLOGIC MAPOFTHE REGION OF THE
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. (Coarse, heavy-bedded brown arkose sandstone inter-bedded with minor quantities of argillaceous and sili-ceous shale, the shale being relatively more abundanttoward the top and bottom of the formation. Totalthickness unknown. Basement complex of diorite and other granitic rocks andgneiss, associated with an extensive dark-colored mica-ceous schist. Fig. 12. Generalized geologic section for the immediate vicinity of the Los Angeles oil fields 1. GEOLOGIC MAPOFTHE REGION OF THE LOS ANGELES OIL FIELDS, CALIFORNIA ii,;.. LOS ANGELES DISTRICT : GEOLOGIC FORMATIONS. 145 BLACK SCHIST. Black micaceous schist with a general northwesterly dip outcrops>n the flanks of the Santa Monica Mountains about a mile north-west of Sherman and extends in a westerly direction along the southlope of the range for at least 15 miles. This schist is black to dark•eddish brown in color, in some cases resembling certain hematite)res, and usually shows a very characteristic luster, due to the faces)f the minute component mica flakes. Little is known concerning;he age of these rocks except that they are older than the granitevhich bounds them on the east. It is certain, however, that theyire pre-Cretaceous and very probable that they are Jurassic. GRANITE. A large part of the Santa Monica Mountains from the vicinity oftoldwater Canyon eastward to Los Angeles River is made up ofgranitic rocks similar in all respects to and probably contempora-leous wi
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