134 
Meganos Group 
Martinez Group 
Chico 
au 
B 
A 
D 
C 
| 
BRUCE CLARK 
Clay shales and sandstones at top, grades 
down into fine, massive, poorly indurated 
sandstone; exposures of the beds of this 
Givisionvare Very (POOL 5.50 a eee 
Sandstone of medium texture; thin-bedded 
H 
near bottom; more massive at top; yel- 
low brown to gray in color with about too 
feet of cross-bedded sandstone, eolian 
type. The massive sandstones near top 
contain lenses of harder calcareous and 
fossiliferous sandstones................ 
. Dark slate-gray shales; bedding planes 
fairly distinct; light calcareous nodules 
and lenses... 65.2 ween ons ee ee 
. Sandstone, fine to coarse in texture; in 
places forms a grit; contains thin clay 
lenses; in places contains considerable 
Garbonaceous material...) ss eee 
. Dark slate-gray shales, similar to (z) 
and (5) se cpei ie astociew he ee 
. Sandstone, medium to fairly coarse; 
weathers on surface a rusty brown; 
grains chiefly of quartz and mica..... 
. Dark slate-gray clay shale; bedding 
planes indistinct; carbonaceous ma- 
terial abundant 92.5. eee 
Coarse to medium fine, quartzitic, gray to 
gray-brown micaceous sandstones, with 
some fine conglomeratic layers which are 
fossiliferous in the eastern part of the 
area. Sandstone quartzitic at one ho- 
Heavy conglomerates; changes to sand- 
stone along the strike; bowlders composed 
of quartzites, chert, limestone, and large 
angular slabs of sandstone, containing 
typical Chico (Upper Cretaceous) fossils 
Unconformity 
; Gray-ereenvshale: | 7.3145 2 oe eee 
. Gray-green glauconitic sandstone; Tro- 
chocyathus zittel, beds. 35). o eee 
. Fine-grained gray sandstone........... 
» Shales'and sandstones)... 550 eeeee 
. Brown conglomeratic sandstone; Mere- 
trix dalli beds. .'. :..... 2. eee 
Total? 
Unconformity 
Feet 
O-I, 500 
0-300 
0-230 
IIo 
75 
700 
0-50 
300 
200 
100 
