19161 



Dickerson: Tejon Eocene of California 



385 



miles, and fossils evidently belonging to the same fauna with those named 

 above are abundant at several places at horizons apparently all somewhat 

 above that at Summersville and ranging through a thickness of several 

 hundred feet. One of the most prolific of these localities is on a hill south 

 of the Clayton-Summersville road and about 2% miles N 35° E of Clayton, 

 where the following species were obtained: 



Leda gabbi (Conrad) Fusus diaboli Gabb 



Nucula (Acila) truncata Gabb Perissolax blakei (Conrad) 



Crassatella grandis Gabb Pleurotoma (Drillia) raricostata Gabb 



Crassatella uvasana Conrad Bela clathrata Gabb 



Tellina hoffmaniana Gabb Fusus occidentalis Gabb 



Meretrix uvasana Conrad Pleurotoma, sp. 



Lunatia nuciformis Gabb Ficopsis remondi Gabb 



Lunatia hornii Gabb Conus remondi Gabb 



Galerus excentricus Gabb Olivella mathewsoni Gabb 



Solarium cognatum (Gabb) Cylichna costata Gabb 



At other localities a little farther west, where smaller collections were 

 made, many of the same species were obtained, together with a few others, 

 such as — 



Venericardia planicosta Lam. Dental ium stramineum Gabb 

 Mysia polita Gabb Tritonium hornii Gabb 



Neaera dolabraeformis Gabb Ficopsis hornii Gabb 



Gadus pusillus Gabb Megistostoma striata Gabb 



The fauna represented by these lists is clearly the original Tejon fauna 

 that occurs in the neighborhood of Fort Tejon, New Idria, and elsewhere 

 along the coast ranges to Washington. Its Eocene character has been 

 recognized by Conrad, Marcou, Heilprin, White and others. 



Dr. Stanton evidently studied the Tejon in the vicinity of Clay- 

 ton and "Summersville" but not south of Stewartville. In the area 

 along the Clayton-Somersville road the Tejon has been brought in 

 contact with the Chico by a strike or oblique fault which has faulted 

 out all the Martinez and about 2000 feet of Tejon strata beneath 

 the coal horizon. 



The collections in the California Academy of Sciences from this 

 vicinity contain the following species : 



List of Specimens From Balanophyllia Variabilis Zone. North of Mount 



Diablo 



259 261 



Spatangus(?) pachecoensis Pack x 



Balanophyllla variabilis Nomland x 



Flabellum californica Vaughan x x 



Stephanophyllia californica Nomland x 



Turbinolia dickersoni Nomland x 



Trochocyathus striatus (Gabb) x x 



Trochocyathus stantoni Vaughan x 



Acila gabbiana, n. sp x 



