CONSTITUTING THE SAN JOS£ CHAIN. 
51 
B .—Section crossing from Guyama to Carizo. 
On west side. 
Granite. 
Dip. 
Thickness. 
1. Coarse grits and green conglomerates__ 
2 Yellow arenaceous grits_ _ _...._ 
| 35° S. 75° W. 
- 700 feet. 
200 “ 
75 “ 
3 Brown sandstones and shales_-___ 
300 gw. 
4 a Reddish conglomerate of jasper.___ _ _._,_ 
4 b. Fine reddish grits, with gypsum_........_-___ 
22° SW. 
15° g. 60° W. 
Total. 
5 G} r pseous sandstones, with ostrea and calcareous beds............... -----_ 
975 feet. 
On east side. 
Granite. 
Dip. 
Thickness. 
1. Green conglomerate_ 
Not observed. 
200* NE. 
2. Brown and yellow sandstones._ 
400 feet. 
60 “ 
400 “ 
3. Reddish conglomerate___ 
4. Gypseous sandstones, with calcareous layers containing ostrea, and argillite 
beds superimposed_,_ 
10o NE. 
Total (observed) 
860 feet. 
As the figures expressing the thickness of the strata are only approximative, they may he 
somewhat under estimated; they show, however, that on the eastern slopes of the axis the 
deposits are thicker than on the western. This thickening is independent of any elevating 
cause. The yellow sandstones, No. 3, are thicker still further to the east, on the Panza hills, 
than they are found upon this range, indicating the source of deposit to be towards the east. 
The contact of the green conglomerates with the granitic rock was frequently observed in 
these hills ; the only rock which at any time separated them was hornblendic gneiss, which, on 
the east side and towards the south, intervened. No metamorphic rocks—no doubtful schists 
were here ; no silurian or palaeozoic rocks. The crystaline and metamorphic limestone which 
occasionally lies next the granite, as on Mount Diablo, Gavilan, and the Cordilleras of Los 
Angeles and San Bernardino, are wanting, and nothing hut tertiary sandstones, efflorescent 
with gypsum and cut through with thin seams of brown peroxide of iron, conglomerates of 
magnesian origin, and those of jasper and porphyry, with superimposed beds of fine sandstone 
and clay, highly fossiliferous, constitute the stratified rocks; these average 1,000 feet in 
thickness. 
The green conglomerate bed is the most persistent of the whole group, being made up of 
rounded fragments of serpentine, chlorite, and trappean rock, cemented by a brown aluminous 
sand, and found in close proximity to the granite ; it occupies the highest points of the range, 
and forms the pinnacled summits which serve as good landmarks from a distance. The red con¬ 
glomerate bed is made up of fragments of jasper and brownish quartz, with obsidian, and 
occasionally amygdaloid greenstone. As these latter rocks are found more abundant to the 
