184 OIL DISTRICTS OF SOUTHERN CALIFORNIA. 
Log of well one-eighth mile wed of middle of .south line of sec. 15, T. 1 S., R. If W 
cm Oil Field, Los Angeles. 
West- 
[Elevation, 240 feet above sea level.] 
Sandy clay. 
Yellow clay.. 
Water sand. 
Hard shale or “shell”. 
Blue clay. 
Hard shale and sandstone. 
Brown sandy shale; very sticky between 204 and 284 feet... 
Clayey shale; 2-foot “shell” at 500 and 570 feet.. 
Alternating clayey shale and fine sandy shale to sandstone. 
Tar oil sand. 
Alternating shale and barren sand. 
Clayey shale, changing to sandy shale; 6 feet of coarse sand at 815 feet. 
Coarse gravel with gas and oil. 
Hard siliceous shale or ‘ ‘ shell ”. 
Sandy shale; considerable gas. 
Clayey shale. 
Oil sand carrying heavy oil. 
Alternating “shell” and sand with considerable gas and oil. 
Very hard “rock”. 
White sand with streaks of tar. 
Tar sand. 
Very hard “rock”. 
Sand rock. 
Tar sand in 3 to 10 foot strata, alternating, with “shell”. 
Tar sand with thin streaks of shale; more gas. 
“Shell”. 
Alternating tar sand and shale, showing of oil and gas between 1,249 and 1,254 feet 
Tar sand with occasional hard “shell” layers. 
Alternating sand and shale, showing of oil and gas. 
Hard coarse sandstone... 
Sand interstratified with brown sandy shale. 
Hard “shell”. 
‘ ‘ Shell ’ ’ and gray sand, carrying tar and gas; sand looks like water sand, but no water 
in it.;. 
AVater sand.. 
Hard “rock”. 
Sand, carrying tar and water. 
Fine sand carrying considerable tar. 
Dry tar sands interbedded with “shell;” “shell” from 1,364 to 1,366 feet. 
White sand, hard at ba^se.. 
Tar bed, with pure tar. 
AVhite quicksand with water. 
Tar sand alternating with thin “shell;” hard “shell” 1,467 to 1,478 feet. 
White sand. 
Hard shell with gas and heavy oil just below it. 
White sand containing tar and gas. 
Sand and brown shale... 
Hard shell. 
White sand. 
Very hard shell with some tar and gas beneath it. 
Hard sand with streaks of shale. 
Thick¬ 
ness. 
Depth. 
Feet. 
Feet. 
11 
11 
29 
40 
70 
110 
2 
112 
81 
193 
11 
204 
139 
343 
349 
692 
80 
772 
6 
778 
12 
790 
60 
850 
2 
852 
6 
858 
17 
875 
15 
890 
35 
925 
35 
960 
20 
980 
20 
1,000 
6 
1,006 
5 
1,011 
30 
1,041 
59 
1,100 
1,185 
85 
5 
1,190 
64 
1,254 
36 
1,290 
6 
1,296 
7 
1,303 
1,308 
5 
10 
1,318 
18 
1,336 
12 
1,348 
2 
1,350 
10 
1,360 
4 
1,364 
9 
1,373 
13 
1,386 
7 
1,393 
3 
1,396 
82 
1,478 
15 
1,493 
3 
1,496 
12 
1,508 
7 
1,515 
5 
1,520 
8 
1,528 
4 
1,532 
12 
1,544 
STRUCTURE. 
The structural conditions in the western field are graphically illus¬ 
trated by PL XX, which shows a section along the line C-D from 
1 mile southwest of the corner of Western avenue and Temple road 
to Edgemont (see also fig. 15), and another section along the line 
A-B, showing the underground geology from the Colegrove area to 
the Salt Lake field (see also fig. 16), and by fig. 14, a section along 
Hoover street. The principal structural feature in the field is the 
northwestward continuation of the Los Angeles anticline. The trend 
of this flexure changes from N. 80° W. to N. 65°-70° W., at the east 
end of this field, Avest of Coronado street. The area of the change 
of trend lies northeast and southwest from the corner of Sixth and 
