56 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Chickasawan. The lone formation is probably to be correlated 

 with the upper Chickasawan, while the upper Arago probably 

 runs as high as into the lower Claiborne. 



The table, page 55, shows the various venericardias of the 

 Eocene, and their horizons correlated with one another. 



Conclusions 



The Chico strata of the Calabasas sheet are lithologically 

 like those of the northern Coast Ranges, and contain a similar 

 fauna. They consist of a lower sandstone and an upper shale 

 member, both of upper Chico age. 



The Eocene lies unconformably on the Chico, and is repre- 

 sented by two distinct formations. The Martinez, or lower 

 Eocene, is faunally very distinct from the Tejon, or middle 

 Eocene, and apparently conformable with it. A slight uncon- 

 formity may exist. 



The Martinez is, in part at least, to be correlated with the 

 Midway of the Gulf States, while the Tejon is more nearly to 

 be correlated with the lower Chickasawan, or lower Lignitic, 

 of the Gulf and Atlantic States. 



List of (upper) Chico (Cretaceous) Fossils from the 

 Calabasas Quadrangle, Southern California 



Ophiuroidea : pages 



*Amphiura lymani, new species 2 58, no 



Echinoidea : 

 ■^*Scutella ? species 2 5S, no 



Pelecypoda : 



Acila truncata Gabb 2 



Chione varians Gabb 3 io8 



Crassatellites conradianus Gabb 3 io6 



*Crassatellites triangulatus, new species 3 59, no 



*Crassatellites tuscanus Gabb 2 59, io8 



* Species known only in the Upper Chico. 



t Fauna from south of the Santa Monica Mountains. None of these fossils were 

 found north of the Simi Fault. 



The numbers following specific names refer to the following localities marked on 

 the map, fig. 3, p. 51: 



1 Chico area north of the Simi fault, near Ventura-Los Angeles county line. 



2 Chico area in Bell's Canyon, north of Simi fault. 



3 Chico area south of the Santa Monica mountains. 



