1916] 



Dickerson: Tejon Eocene of California 



441 



Tejon of the Santa Ana Mountains 



The Tejon of the Santa Ana Mountains is intimately connected 



with that of San Diego and it represents the Rimella simplex zone. 



The stratigraphic relations of the Tejon was discussed in a recent 



paper. 77 The fauna listed from University of California locality 2243 



is as follows : 



Cardium, cf. brewerii Gabb Cerithiopsis, sp. 



Solen parallelus Gabb Cylichna costata Gabb 



Tellina, cf. longa Gabb Ficopsis remondii Gabb 



Cadulus pusillus (Gabb) Natica, sp. 



Ancillaria, sp. Turritella, sp. 



Bullaria hornii (Gabb) Turritella uvasana Conrad 



This fauna appears to represent the Rimella simplex zone, as one 



of its most characteristic species, Turritella uvamna, was fairly 



abundant. 



Tejon Near Lower Lake, Lake County, California 



Rocks of Tejon age occupying an elliptical area two and one-half 

 miles long on the eastern portion of the Lower Lake syncline rest upon 

 the Martinez. Coarse gray to white, conglomeritic concretionary 

 sandstone which upon weathering gives rise to bluffs makes up prac- 

 tically its entire thickness, 1100 to 1200 feet. It is lithologically dis- 

 tinct from the uppermost Martinez, which consists of thin-bedded, 

 fine-grained, green-gray sandstone with green shales. No sharp con- 

 tacts between the Martinez and Tejon were found and hence their 

 relations to one another are not entirely clear. The dips in the Tejon 

 vary from 30° to 35°, while those of the Martinez are, on the whole 

 much higher. This, taken together with a distinct faunal break and 

 abrupt lithological change, leads us to believe that a considerable 

 time-interval elapsed between the deposition of these two groups of the 

 Eocene. Only two fossil localities were found in the Tejon. The 

 fauna found at University of California locality 785, which is about 

 900 feet above the base of the Tejon group, is as follows : 



Crassatellites, cf. uvasana (Gabb) Meretrix hornii Gabb 



Dosinia elevata Gabb Psammobia hornii (Gabb) 



Spisula tejonensis Packard Solen parallelus Gabb 



Meretrix ovalis Gabb Paphia, cf. cretacea Gabb 



Meretrix, sp. Tellina longa Gabb 



n Dickerson, R. E., The Martinez and Tejon Eocene and Associated 

 Formations of the Santa Ana Mountains, Univ. Calif. Publ. Bull. Dept. 

 Geol., vol. 8, pp. 257-274a, 1914. 



