. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. llywood and Cahuenga Valley Railroad atthe corner of Western avenue and Temple road; the third is locatedi LOS ANGELES DISTRICT : WESTERN FTELD. 175 two or three blocks northwest of the second; and the fourth covers afew acres at the east end of the Rancho la Brea about a mile south of Colegrove. BAPTIST COLLEGE AREA. A reference to the geologic map (PL XVIII; will show that withinthe Baptist College area are the outcrops of five distinct zones, whichare, from the base up, the
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. llywood and Cahuenga Valley Railroad atthe corner of Western avenue and Temple road; the third is locatedi LOS ANGELES DISTRICT : WESTERN FTELD. 175 two or three blocks northwest of the second; and the fourth covers afew acres at the east end of the Rancho la Brea about a mile south of Colegrove. BAPTIST COLLEGE AREA. A reference to the geologic map (PL XVIII; will show that withinthe Baptist College area are the outcrops of five distinct zones, whichare, from the base up, the oil-bearing thin-bedded shale and sandstoneof the Puente formation, southwest of these the 150-foot oil sand ofthe central field, the white-shale zone at the top of the Puente, thethin-bedded sandstone of the Fernando, and over all in more or lessscattered patches the Pleistocene gravel and sand. Oil is derivedprincipally from a zone (probably corresponding with the lower oilzone of the central field) of interbedded clayey shale, shell, and oilsands, the top of which lies from 200 to 400 feet below the bottom of. Sand and gravel Sandy shale Clayey shale Scale 200 400 600 soo looofeet Fig. 14.—North-south section on the line W-F, Pis. XVIII, XIX, along Hoover street from Firstto Sixth streets, Los Angeles, showing the structure of the western field. the main oil sand of the Los Angeles district. As would be expected, the logs of the wells in this area farthest toward the southwest give the most complete records. The Fernando formation consists of sandy shale and fine sandstone, beneath which are the clayey shale and in- i terbedded shell layers which lie above the thickest sandstone bed. This sandstone bed (first oil sand), where reached by wells south of its j outcrop, usually gives a small yield of heavy oil. Below the sand- j stone the wells penetrate about 400 feet of thin-bedded blue clayey shale, thin hard shell, and interbedded oil-bearing sands. Between 130 and 170 fe
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