. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. n I he city of I <os Angeles,and the br§a was locally used for fuel. In L892 Messrs. Doheny A: Connon sunk a 4 by6 l k i shaft, 155 feet deep, at the corner of Patton and State streets, close to 1 he depositof brea previously mentioned. The formation penetrated is sandy shale, with a few ?thin strata of siliceous or calcareous rock. Near the surface the oil was very heavy,but at about 7 feet deep it was found to be lighter and it seeped from the sides of theshaft. The oil e
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. n I he city of I <os Angeles,and the br§a was locally used for fuel. In L892 Messrs. Doheny A: Connon sunk a 4 by6 l k i shaft, 155 feet deep, at the corner of Patton and State streets, close to 1 he depositof brea previously mentioned. The formation penetrated is sandy shale, with a few ?thin strata of siliceous or calcareous rock. Near the surface the oil was very heavy,but at about 7 feet deep it was found to be lighter and it seeped from the sides of theshaft. The oil exuded from porous material and from the surface planes of the hardstrata. The formation was found to dip toward the south at an angle of about 40°.Excavation below a depth of 155 feet was prevented by gas. An 18-inch hole wasthen drilled in the bottom of the shaft and yielded 7 barrels of oil daily for severalweeks. In July, 1894, the yield had decreased to 2 barrels of oil a day. I n November, a The writer is largely indebted to the reports of W. L. Watts for data of a historical character usedin this STREET AND SECTION MAP OF TH] EZ3 EE3 -ETIN NO. 309 PL.
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