U.S. GEOLOGICAL SURVEY 
CHARLES O. WALCOTT, DIRECTOR 
BULLETIN NO.309 
PL. I 
LEGEN D 
R. 19 W. 
119 00' 
R 20 W 
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A- V. 
Pnulu 
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R. 21 W. 
R.I7W 
R. 16 W. 
II9°I5' R.23W. 
R. 15 W. 
A HOEN & Ca, BALTIMORE, MD 
Geology by George H. Eldridge, 1902 
R. U Goode, Geographer in charge. 
Triangulation by Coast and Geodetic Survey and S. S. Gannett. 
Topography by T. G. Gerdine, L. C. Fletcher, R. B. Marshall, W. S. Post, and J. G. Hefty 
893-1902. 
For sections see- Plates ffluiui [V 
SANTA CLARA VALLFA 
AND ADJACENT OIL FIELDS, VENTURA AND LOS ANGELES COUNTIES 
Surveyed in 1 
62500 
C 011 tenxi- interval50 feet 
Datum is mea/t le vel . 
o 
N / 
o \ 
05 
Id 
5 
Qal 
Alluvium 
Alluvium and stream wash 
Qp 
Pleistocene formations 
Head of Santa Clara Valley: 
Gravel, sand,aiul clay,prohaTly 
of freshwater origin 
Mouth of Sespe Canyon: 
Bright-red gravel (questionable* age 
UNCONFORM ITY 
1 C 
Fernando formation. 
Conglomeiate, sandstone, and 
arenaceous clay 
UNCONFORMITY 
Shale 
Siliceous shale, with occasional 
in terbedded sandstone 
O' 
Tss 
Sandstone "No. 2 
Tight-yeRow siliceous 
sandstone, lower 100 feet 
with iuterbedded shale 
Sandstone -N o.l 
Massive, heavy-Tedded 
concretionary sandstone 
Vaqueros formation 
Rusty and gray shale with 
interbedded limestone and sandstone 
Tu 
Upper 
Rusty calcareous sandstone 
u< 
Middle 
Brownish-red sandstone and 
conglomerate,with minor 
layers of sandy and muddy shale 
Tower 
White sandstone and greenish 
o 
shale 
||||||jp 
Tt 
Topatopa formation 
Quartzite, sandstone, and 
hard,more or less siliceous 
and earthy'shale 
Granite and. gneiss 
Fault lines 
Contact lines 
Structure lines 
Strike and dip 
At 
Sync line 
*h. 
Anticline 
S 
Complex Cold 
Well s 
> 
/ 
SESPE FORMATION MODELO FORMATION 
