1914] 



Dickerson: Faunal Zones of the Tejon Group 



23 



Separated from the second bhiu by alternating shales and sand- 

 stones is the third bluff, consisting of a massive tan rock, weathering 

 in a manner similar to that of the other, but giving outcrops not 

 quite so prominent. This is 550 feet thick and non-fossiliferous. 



ZONE 3 



The remainder of the Tejon may be grouped as alternations of 

 carbonaceous shales and fine-grained sandstones. Within this upper 

 horizon, extending from 400 to 800 feet below the Monterey contact, 

 are found abundant fossil strata having for their most characteristic 

 fossil the coral Trochocyathus striatits, which is associated here com- 

 monly with Schizaster lecontei and Cardium eooperi. This zone ap- 

 pears to be somewhat lower than the uppermost Eocene of the Marys- 

 ville Buttes region. Some of these strata were deposited in moderately 

 deep water, although carbonaceous deposits found just below them 

 indicate that the land was not in a stable condition at that time. 



SIPHONALIA SUTTERENSIS ZONE 



The uppermost faunal zone thus far recognized in the study of the 

 Tejon is that of the Marysville Buttes region. This faunal zone was 

 discussed at length by the writer in a recent paper. 2 A further 

 investigation of this uppermost faunal zone was made during the fall 

 of 1913. This zone has been found beneath the Older Basalt of South 

 Table Mountain in a locality about two miles north of Oroville. A 

 list of this fauna is sriven below. 



Partial List of Tejon Fauna, South Table Mountain, Oroville, University 

 of California Locality No. 2225 



Turritella merriami Dickerson. 

 Phos (?) martini Dickerson. 

 Turris perkinsiana (Cooper), 

 Turris inconstans (Cooper). 

 Drillia ullreyana Cooper. 

 Drillia, n.sp. 

 Cerithiopsis, n.sp. 

 Turris monolifera (Cooper). 

 Surcula elarki Dickerson. 

 Siphonalia sutterensis Dickerson. 

 Neverita secta Gabb. 

 Neverita globosa Gabb. 

 Lunatia nuciformis Gabb. 

 Tritonium diegoensis Gabb. 



Cancellaria stantoni Dickerson. 

 Cordiera graeillima Cooper. 

 Acmaea, n.sp. 

 Spisula, n.sp. 

 Area hornii Gabb. 

 Barbatia morsei Gabb. 

 Ostrea cf. appressa Gabb. 

 Venericardia planicosta Lamarck. 

 Modiolus ornatus (Gabb). 

 Acila, n.sp. 



Meretrix hornii Gabb. 

 Leda gabbi Conrad. 

 Teredo, sp. 



2 Dickerson, E. E., "Fauna of the Eocene at Marysville Buttes, California, 

 Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, pp. 257-298, 1913. 



