EARLIER TERTIARY (EOCENE AND OLIGOCENE). 



753 



Tentative correlation of formations of Santa Maria district with the standard California Coast 

 Range section and with that of the Santa Clara Valley. 



Era. 



"System. 



C8 



c3 =2 

 to 





Period. 



Recent. 



Pleistocene. 



Pliocene. 



Mio 



Oligocene. 



Eocene. 



Standard Coast Range 

 section. 



Alluvium. 



San Pedro. 



Merced . 



- Unconformity - 



Purisima. 



San Pablo. 



Unconformity - 



Monterey. 



Vaqueros. 



San Lorenzo. 



-Unconformity? 



Tejon. 



Martinez. 



Unconformity ?- 



Chico. 



- Unconformity - 

 Horsetown. 



Unconf ormity - 



Knoxville. 



Unconformity - 



Franciscan . 



Unconformity - 



Granite, schist, etc. 



Santa Maria district 

 section. 



Alluvium. 



Terrace deposits and dune 



sand. 

 Unconformity 



Fernando. 



- Unconformity - 



Monterev. 



Vaqueros," Sespe, and 

 Tejon, undifferentiated 

 (including some Mon- 

 terey in Santa Ynez 

 Range). 



(?) 



Knoxville. 

 Franciscan. 



Santa Clara Valley 

 section. 



Alluvium. 



Sand and gravel. 

 Unconformity - 



Fernando. 



- Unconformity - 

 rShale. 



ModelO' 



Upper sandstone. 



Shale. 



Lower sandstone. 



Vaqueros. 



{Upper. 

 Red beds. 

 Lower. 



Topatopa. 



(?) 



Unconformity- 

 Granite, gneiss, etc. 



The Santa Ynez Range is mostly composed of a thick terrane of marine sediments equiva- 

 lent to a part or aJl of the Tejon formation and the Vaqueros formation. The former is Eocene 

 and the latter lower Miocene in age. This terrane comprises a continuous succession of marine 

 sediments of detrital origin, seeming to present no point at which an angular unconformity 

 exists, although the line at the base of the coarse conglomerate containing the Vaqueros fossils 

 doubtless marks a long time interval. 



The lower portion of the terrane is made up of a thick series of greenish-gray coarse and 

 fine sandstones, many of them concretionary in character, interbedded with dark, fine-grained 

 thin-bedded shales in lesser amount. Toward the middle of the terrane the shale increases 

 in amount, alternating with thin beds of sandstone. Much of the shale has a characteristic 

 olive-gray color. * * * The shales and sandstones give place above the middle of the 

 terrane to deposits of shallow-water character — coarse sandstone and a great quantity of 

 coarse, in many places greenish or reddish gravelly conglomerate. This conglomerate con- 

 tains abundant Vaqueros [Miocene] fossils and probably represents the base of that formation 

 48011°— 12 48 



