1914] Dickerson: Fauna of the Martinez Eocene of California 111 



LIST OF MARTINEZ SPECIES (Continued') 



MARTINEZ LOCALITIES RANGE OF SPECIES 



SUGGESTION OF FAUNA AS TO CLIMATE DURING MARTINEZ TIME 



The collections from strata of Martinez age contain the genera 

 Cypraea, Ovula, Aturia, Turris, and Surcula, which are represented 

 mainly by tropical or subtropical species in the ocean of the present 

 time. Several genera which are now represented by boreal or tem- 

 perate species are found in this fauna as well. This evidence seems 

 to indicate that the climate of Martinez time was decidedly milder 

 than that of the Recent period in these latitudes. The mixture of 

 subtropical and boreal forms indicates a warm temperate climate. 

 Practically none of the genera mentioned above -occur in the Chico, 

 and an absence of other tropical or subtropical genera from the 

 uppermost Cretaceous shows some change in climate between Chico 

 and Martinez times. Tejon climate, however, was decidedly warmer 



