436 THE JOURNAL OF GEOLOGY. 
the granite forming the core of the range, the metamorphic 
sandstone, the thin-bedded chert, and the serpentine. 
The limestone, whose age is unknown, occurs in two beds, 
extending southward from near Point San Pedro. 
COLUMNAR:-SECTION OF THE SANTA CRUZ MOUNTAINS. 
o ake i 
5 Subaérial deposits. Bm 
o : : [| 
g Marine deposits. ze 3 
2 Subaérial deposits. Elephas, conifers. a8 
» | 8 | Fossiliferous beds of sandstone, Living shells eae 
n 5 6 6 
5 | — | shale, and conglomerate. Mactra (not Venus) pajaroensis.| = + 
9 iS oy 
° ond . 
= | § | Transitional fromthe Miocene. Large Pectens, Arcas, etc. Heel 
= | to the Pleistocene. Cetacean bones. ey 
¥ 
“ 
o . . a 
® | Bituminous or White Infusoria. os 
e q . . Siew 
& | & | Miocene shale; with some Pecten peckhamt, % 8 
3) Bw) i os 8) 
- | § | sandstone. Tellina congesta. ey 
a |e 
me 
SoS 3 Sandstones and conglomerates ; ( Turritella hoffmannt. 29 
“3; | & | Carmelo series (?) | Ostrea titan. FE & 
i 0 
g 3 Pescadero sandstones and | Liropecten estrellanus. 26 
iS) a Gn Ho 
| 2 | shales. | Dosinia, etc. 8 
na. a . n 
Z The “San Francisco sandstone” Plant remains. ra 
. 5 
S (in part). Lnoceramus. es 
& Aucella beds. Aucella. = 
wn 
=} 
° . . . ° . 
9 Radiolarian chert or phthanite. Radiolaria. 2 
w 5 S 
5 Metamorphic sandstone. ao 
. Gavilan limestone. Foraminifera. a 
_ 
a 
It is usually highly crystalline, and, though of great thick- 
ness, is not prominent in the mountains. 
The granite appears prominently in only two ridges; from 
Point San Pedro southward a few miles, and from Santa Cruz to 
Pescadero Creek. Occasional outcrops, however, show that it 
has considerable body under the main ridge. It is thought to be 
