CHAPTER XXX. 



ORDER OF POSITION OF CALIFORNIAN STRATA. 



Unconsolidated. 



Modern alluvium. — Soil of valleys — present river bottoms. 



Ancient alluvium. — Terraces of river beds, raised beacbes, deep valley clays, and upper drift; 

 tbickness, 400—500 feet. 



Consolidated. 

 MIOCENE. 



UPPER. 



A. — Bituminous and foraminiferous beds ; trappean conglomerate ; soft yellow sand- 

 stone ; foraminiferous layers ; argillite beds 400 feet. 



MIDDLE. 



B. — Grits and calcareous sandstones, as at Panza and Santa Margarita 360 " 



C. — San Antonio sandstones, with dosinia, &c 250 " 



L O W E K . 



D. — Gypseous and ferruginous sandstones of Santa Inez, Panza, and Gavilan, con- 

 taining ostrea, turritella, &c 1,200 " 



Total thickness of Miocene strata 2,211 " 



Metamorphic limestones of Gavilan, &c 400 " 



Primary schists, gneiss, and talcose slates 1,500 " 



Total tbickness of strata 4,111 " 



