1914] Dickerson: Eocene of the Santa Ana Mountains 



265 



List of Martinez Species — (Continued) 



2233* 2219 2218 2217 2216 



Dentalium, sp x 



Calyptraea excentriea (Gabb) x 



Fusus ( ?), sp x 



Ficopsis ( ?), sp. x 



Gyrodes, sp x 



Einginella, cf. pinguis Gabb x 



Turritella infragranulata Gabb x x .... x x 



Turritella paehecoensis Stanton x x x x x 



* The numbers at top of columns refer to University of California localities. 



Of these species Turritella paehecoensis, Crassatellites unioides, 

 Tellina undulifera, and Meretrix stantoni are distinctive Martinez 

 species. This Martinez fauna is small but characteristic, and when 

 compared with that of the typical Martinez of the San Francisco 

 Bay region appears to represent the lower and middle portions only. 

 Crassatellites unioides, Meretrix stantoni, and Einginella pinguis are 

 characteristic of the lowermost and middle zones of the Martinez. The 

 Tejon was not found in contact with the Martinez. Three or four 

 small outliers of Tejon were observed along Santiago Creek Canon. 



TEJON GROUP 



The Tejon is represented by three small remnants of which the 

 largest is a strip in the neighborhood of the Santiago Coal Mine, 

 which is two miles long from east to west and nearly half a mile in 

 width. In this vicinity the Tejon rests unconformably upon the Chico, 

 the basal beds having a dip of 60° S and strike of N 85° E, while the 

 underlying coarse brown sandstone of the Chico has a dip of 80° S 

 and strike of N 75° E. The basal beds of the Tejon consist of twelve 

 feet of lignite and carbonaceous shale. These are overlain by a two- 

 foot bed of fossiliferous limestone which yielded a fauna as follows: 



Avicula pellucida Gabb. Crassatellites, cf. uvasana Conrad. 



Mytilus, cf. ascia Gabb. Potamides, sp. 



Corbicula, sp. 



A north-south section through the Tejon in descending order is 

 as follows : 



Valley alluvium. 



Pine-grained light-tan sandstone containing an abundance of fish 

 scales, 250 feet. 



Coarse conglomerate, 170 feet. 



