LOS ANGELES DISTRICT: WESTERN FIELD. ] 79 
ancy is doubtless due to the proximity of the area to the axis of the 
Los Angeles anticline. 
The wells in the northern part of the area, near Temple road, after 
penetrating gravel and sand for approximately 100 feet pass through 
alternating clayey shale and fine sandstone for about 250 feet. At 
this depth the oil sand, which appears to be barren at the top but 
productive below, is encountered and extends for 35 feet. About 
20 feet below this is a layer of sand which yields flowing water. The 
wells in this part of the area yield an average of 1 to 2 barrels of 
15° B. oil per day, and in addition considerable quantities of gas 
and usually less than 2 per cent of water. 
About one-fourth mile to the southwest down the dip from the ter¬ 
ritory just described the wells reach the oil sand at 310 feet. The 
sand is here 40 feet thick and is somewhat more productive than it 
is higher up, yielding on an average 6 barrels per day per well. The 
same strata were penetrated and the same amount of water is encoun¬ 
tered in these deeper wells as in the wells to the northeast. 
Still farther southwest, about one-half mile southwest of the corner 
of Western avenue and Temple road, the wells strike an oil sand at 
■a depth of about 350 feet which outcrops at the surface in the vicinity 
of the wells just described. This sand furnishes the main yield of 
these wells. About 350 feet below this upper oil sand is encountered a 
second oil zone corresponding to the productive sand of the wells half a 
mile to the northeast. The strata above the first sand are largely clayey 
and sand}" gray shale, possibly Fernando in part, with some harder 
shale and “shell” layers immediately above them. Between the first 
and second oil zones are alternating clayey and sandy shale with a few 
thin layers of hard siliceous shale or “shell;” isolated accumulations 
of oil and gas occur throughout these beds. 
The three following well logs are characteristic of the region near 
Western avenue: 
Lou of well one-fourth mile east of the corner of Temple road and Western avenue, 
Los Angeles. 
[Elevation, 280 feet above sea level.] 
Thick¬ 
ness. 
Depth. 
ft revel end bowlders . 
Feet. 
45 
Feet. 
45 
75 
30 
20 
95 
Small dpLLIgS .. 
20 
115 
Soft, sandstone .- 
12 
127 
TTq rH snndstnrift 
6 
133 
15 
148 
FT o rrl Llnnlr shfllp: .. '. 
17 
165 
“Shell” nr hard white siliceous shale. 
3 
168 
38 
206 
4 ‘ T4 a o r? ’ * nil so.nd 
35 
241 
35 
276 
chain underlain hv stratum of artesian water. 
20 
296 
