GEOLOGY. 
27 
standard California section and with that of Santa Clara Valley, Ven¬ 
tura County: 
7 entative correlation of formations of Santa Maria district with the standard California 
Coast Range section and with that of the Santa Clara Valley. 
Era. 
Sys¬ 
tem. 
Period. 
Standard Coast Range 
section. 
u 
s 
Recent. 
Alluvium. 
£ 
CS 
& 
Pleistocene. 
San Pedro. 
Pliocene. 
—— Unconformity—— 
Merced. 
Purisima. 
o 
O 
San Pablo. 
N 
o 
c 
s 
o 
Sh 
.2 
u 
Miocene. 
Monterey. 
a> 
H 
Vaqueros. 
Oligocene. 
San Lorenzo. 
— Unconformity? — 
Tejon. 
Eocene. 
Martinez. 
— Unconformity? — 
Chico. 
-Unconformity- 
Horsetown. 
-Unconformity- 
Knoxville. 
d 
o 
N 
o 
Cretaceous. 
CO 
o> 
Jurassic (?). 
-u nconiormiLy — 
Franciscan. 
-Unconformity- 
Granite, schist, etc. 
Santa Maria district 
section. 
Alluvium. 
Terrace deposits and 1 
dune sand. 
-Unconformity- 
Fernando. 
Unconformity- 
Monterey. 
Vaqueros, Sespe, and 
Tejon, undifferenti¬ 
ated (including some 
Monterey in " Santa 
Ynez Range). 
(?) 
Knoxville. 
Franciscan. 
Santa Clara Valley 
section. 
Alluvium. 
Sand and gravel. 
— Unconformity — 
Fernando. 
-Unconformity 
_c 
XJ' 
O 
Shale. 
Upper sandstone. 
Shale. 
Lower sandstone. 
Vaqueros. 
g. (Upper, 
ml Red beds. 
oq [Lower. 
Topatopa. 
(?) 
-Unconformity —— 
Granite, gneiss, etc. 
FRANCISCAN FORMATION (JURASSIC?). 
The oldest rocks within the Santa Maria district belong to the Fran¬ 
ciscan formation, which is probably of Jurassic age. H. W. Fair¬ 
banks described the same formation under the name San Luis in the 
San Luis folio. The Franciscan is a very important basement for¬ 
mation in the Coast Ranges farther north. The small areas of these 
rocks occurring here consist of remnants of beds of sandstone, shale, 
glaucophane schist, and jasper associated with serpentine that has 
probably been intrusive in them. The sandstone is usually of a dark- 
green color, fairly fine grained, and considerably indurated. The 
jasper is banded by thin contorted beds, These sediments are so 
