LOS ANGELES DISTRICT: WESTERN FIELD. 
177 
occurs in most of the wells,- but not in sufficient quantities to be of 
economic importance. The oil is mostly black, but the emulsion of 
oil and water as it is pumped from the wells usually appears bronze 
colored. Some of the wells near the corner of Dome and Hoover 
streets, high up on the rise of the oil sands and not far from the axis 
of the anticline, yield red oil, which, however, becomes black on 
exposure to the air. The gravity of the oil in the Baptist College 
area varies from 12.5° to 14.5° B. The production is from a fraction 
of a barrel to 5 or 6 barrels per day. Some of the wells are said to 
have started with a production of 75 to 100 barrels but fell off to 30 
barrels after ten months, 3 barrels after two years, and 1J barrels 
after three years. The effect of the new wells on the old was imper¬ 
ceptible, the decrease in production being due to a local sapping of 
the sand immediately surrounding the well. 
The three following logs are characteristic for their respective 
localities: 
Log of well immediately southwest of the corner of Hoover and Fourth streets, Los Angeles. 
[Elevation approximately 275 feet above sea level.] 
• 
Thick¬ 
ness. 
Depth. 
Coarse sand, with clayey and sandy shale and occasional thin “ shell ” layers toward 
the base. 
Feet 
250 
Feet. 
250 
Excellent oil sand, yielding 75 to 100 barrels of oil at start. 
100 
350 
Alternating thin-bedded sandstone and shale containing water. 
650 
1,000 
1,006 
Layer of coarse conglomerate (“bowlders”). 
6 
Alternating thin-bedded sandstone and shale, with water. 
94 
L 100 
Good oil sand; some water. 
20 
1,120 
Clayey shale . 
180 
1,300 
1,350 
Good oil sand; some water. 
50 
Soft clayey shale, too soft to hold casing for shutting off water. 
80 
1,430 
Log of well immediately northeast of the corner of Hoover and Geneva streets, Los Angeles. 
[Elevation approximately 290 feet above sea level.] 
Thick¬ 
ness. 
Depth. 
Brown clayey shale . 
Feet. 
60 
Feet. 
60 
Coarse sand and water . 
130 
190 
Oil sand . 
22 
212 
Very hard “shell” .«-. 
3 
215 
Barren oil sand . 
55 
270 
Oil sand . 
58 
328 
