1913] Dickerson: Fauna of Eocene at Marysville Buttes 273 



The Tejon East of South Butte 



Two fossiliferous localities in the lone formation are de- 

 scribed in the Marysville folio, and these places were recently 

 mentioned by Lindgren 17 in the Tertiary Gravels of the Sierra 

 Nevada of California as follows : 



"Marine fossils were found about two miles east of South 

 Butte and two and one-half miles north-northwest of South 

 Butte. The fossils, while not abundant, point to a Miocene age. 

 These beds are believed to be the exact equivalent of the lone 

 formation exposed along the foothills of the Sierra Nevada. 

 Their aggregate thickness is very considerable, 1,000 feet being 

 a fair minimum estimate. The following fossils were identified 

 by Messrs. Stearns and Dall : ' ' 



Crassatella collina Conrad Maeoma, sp. 



Venericardia borealis Conrad Tapes (Cuneus), sp. 



Verticardia (?), sp. Saxidomus, sp. 



Acila eastrensis Hinds Cardinm modestum Conrad 



Lioeardium apicinum Carpenter Galerus, sp. 



Fusus (Exilia), sp. 



In another place Lindgren states : ' ' These fossils are regarded 

 by Messrs. Stearns and Dall as Miocene." 



The writer visited these localities recently and found the fol- 

 lowing fauna at the first locality, two miles east of South Butte : 



University of California Locality 1856 



Ancilla (Oliverata) californica Tritonium whitneyi Gabb 



Cooper Tritonium, ef. californicum Gabb 



Galerus excentricus Gabb Cordiera graeillima Cooper 



Voluta lawsoni, n.sp. Lunatia nueiformis Gabb 



Dentalium stramineum Gabb Cardita planicosta Lam. 



Trochocyathus striatus (Gabb) Cardium dalli, n.sp. 



Turris monolifera (Cooper) Tellina sutterensis, n.sp. 



Turris suturalis (Cooper) Meretrix, cf. ovalis Gabb 



The fossils were found in limestone fragments which are ex- 

 actly like those in the Eocene on the west side of the mountain. 

 Essentially the same stratigraphic sequence is found on the east 

 side as is seen on the west. The same bright red clay and glau- 



17 Lindgren, W., The Tertiary Gravels of the Sierra Nevada of Cali- 

 fornia, Professional Paper 73, U." S. Geol. Surv., pp. 57, and 120, 1911. 



