CONSTITUTING THE SAN JOSfi CHAIN. 



51 



B. — Section crossing from Cuyama to Carizo, 



On west side. 



On east bide. 



Granite. 



1 . Green conglomerate- - 



2. Brown and yellow sandstones 1 



3. Reddish conglomerate 



4. Gypseous sandstones, with calcareous layers containing ostrea, and argillite 



heds superimposed 



Dip. 



Not observed. 



20° NE. 



10° NE. 



Total (observed) 



Thickness. 



400 feet. 

 60 " 



400 " 



860 feet. 



As the figures expressing the thickness of the strata are only approximative, they may be 

 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 palajozoic 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 but tertiary sandstones, efHorescent 

 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 



