LOS ANGELES DTSTKICT : WESTEKN FIELD. 181 
AREA ONE-FOURTII MILE NORTHWEST OP TEMPLE ROAD AND WESTERN AVENUE. 
The underground geology 
# in the SE. 1 sec. 14, T. 1 S. 
the corner of Temple road 
and Western avenue, in¬ 
troduces a new structural 
factor in the shape of a 
northeast - southwest line 
of disturbance. In a jour¬ 
ney westward through the 
•7 O 
western field this is the 
first evidence encountered 
of the secondary zone of 
disturbance which to the 
southwest develops into 
the Salt Lake flexure. 
The line of disturbance or 
fault appears to extend in 
a southwesterly direction 
from the northeast corner 
of the SE. 1 sec. 14, 
through a point 80 feet 
west of Loma Vista well 
No. 5, and thence indefi¬ 
nitely toward the Salt 
Lake field. 
East of this line of dis- 
t u r b a n c e the main oil 
zone, which is here from 
80 to 90 feet thick, is en¬ 
countered at a depth of 
between 195 and 210 feet, 
t he overlying beds consist- 
ing of Pleistocene sand 
and gravel near the sur- 
face, with thin - bedded 
shale and fine sandstone 
below. The wells yield as 
high as 20 barrels per day 
when they first come in, 
but this production falls 
off and at the end of two 
years is in few cases over 
2 barrels. The original 
high production is caused 
Bull. 309—07-13 
in the vicinity of the little group of wells 
, R. 14 W., one-fourth mile northwest of 
AB:F 
240' 
AB:d 
239' 
level 
Sea 
300 *- 
Shale 
Sandy shale 
Sand, adobe, clay 
Hard shell 
Dead oil sand and tarstreaks 
Live oil sand 
Fig. 16.—Detail of section along the line A-B, PI. XVIII, 
western oil field. Small letters indicate locations of wells on 
section A-B, PI. XX. 
