278 GUIDEBOOK OF THE WESTERN UNITED STATES 
earliest fields discovered in California. The first well was completed 
in 1880, and at the end of 1912 there were 470 producing wells with 
an annual output of 7,000,000 barrels and an aggregate production of 
The wells were in the outcrop area of the thick 
41,000,000 barrels. 
body of shales constituting the lower half of the Puente formation, 
N. 
WALNUT 
SIDING 
SK = eee 
SSSSSSS SS 
ES|SS=——SE==a=EaEEE 
——SSS 
SS SS 
SSS SS — —— ——— 
——S—_V_ _—»—> SSS 
SSS SES SS SSS: 
\ = Ss 
Nas SSS 
Ws SSS —S==- 
SssSss== —— 
SS een 
Toss 
M —S 
N —S 
LoS SS 
Fault 
N. 
Ss. West 
é Pomona 
REE oe cme 
peg a 
8257/1 (Granite ',;2 
iS en her esr oY 
+ 7 he et a * 4 
————— ffs 
—— See 
: SS ae” 
Se ee eS re ee 
° eee. _ 2 Miles 
i. 7 ; 
Ficure 68.—Sections across Puente Hills, Pomona to Whittier, Calif. After English and 
Kew. Tf, Fernando group (Pliocene and Pleistocene), Tp, Puente formation (Miocene) 
and the oil is thought to have migrated from the great oil fields to the 
southeast. The depths of the wells were mostly from 1,000 to 2,000 
general region now comes from 
The large oil production of this 
Canyon, Coyote Hills, and other fields 
ae the Santa Fe, Whittier, Brea 
: along the south slope of the Puente Hills or south of them. 
