1916J 



Dickerson: Tejon Eocene of California 



425 



Chico series are overlain by Tejon Eocene which in turn is overlain 

 by white shales of probably Olig'ocene age. Middle Miocene strata, the 

 Temblor of Anderson, the Santa Margarita, the Etchegoin formation, 

 and the Tulare occur in succession, as one travels toward the San 

 Joaquin Valley. The "lower chocolate shales" of Dumble are divis- 

 ible into two portions, the lower portion of which is characterized by 

 the abundance of nodules of barite, while the upper portion, which 

 yielded an Eocene fauna, is characterized by a sandy clay shale slightly 

 different in color and texture from the underlying chocolate shale of 

 probably Cretaceous age. This upper shale is decidedly glauconitic 

 and a two-foot bed of glauconitic sandstone charged with Turritella 

 anclersoni, n. sp., and many other Eocene fossils is another minor but 

 characteristic stratum. The unconformity described by Dumble is at 

 the base of Anderson's Domengine sands, the beds beneath the white 

 shale. The evaluation of this unconformity will be discussed after 

 the faunas from the Domengine sands, and the underlying shales are 

 presented. 



Fig. 9. Section showing Tejon group and associated strata in the vicinity of Domen- 

 gine Ranch, Coalinga Quadrangle. (After Ruckman.) 



FAUNA FROM LOWERMOST BEDS 



Turritella anclersoni, n. sp. is found in great abundance in the 

 fauna from the glauconitic sandstone stratum mentioned above. This 

 new species gives a peculiar east to this Eocene fauna and, taken 

 together with several new species in it made at first a very perplexing 

 problem. Large collections from Canada de las Uvas, the type local- 

 ity of the Tejon group, vicinity of Mount Diablo, San Diego, and 

 State of Washington have furnished such excellent comparative mate- 

 rial that the solution has been greatly simplified. 



The species obtained from the lowermost horizon are as follows: 



List of Species From University of California Locality 1817 



Type Turbinolia 

 Tejon Zone 



Nummuloid, sp. indet x 



Trochocyathus imperialis Nomland 



Flabellum(?) merriami Nomland 



