686 



ARNOLD AND HANNIBAL— MARINE TERTIARY [April 19, 



small but characteristic fauna from limestone lenses intercalated in 

 the diatomaceous shales. 



Partial List of Species in the Monterey Formation (Oligocene-Miocene) 

 Betiveen Monterey and Carmel, California. 

 Pelecypoda : 



Area devincta Conr. {A. montereyana Osmont).^^ 



Leda taphria Dall.39 



Leda penita Conr.^s 



Marcia congesta Conr. (Tellina congesta Conr.).3s 



Nucula townsendi Dall (ranges into Astoria). 



Pecten peckhami Gabb (ranges into Tejon). 



Venericardia montereyana Arn.^s 

 Gasteropoda : 



Caesia arnoldi F. M. And. (ranges into Empire). 



Ficus kernianus Cooper.^s 



Polinices saxea Conr.^s 



Turritella cf. variata Conr.^s 



This unmistakably fixes the identity of the Agasoma zone of 

 California and what the senior writer'*'^ has described from the north 

 coast of Washington as the Clallam formation with the ^Monterey 

 shale, and it is proposed to unite all these under this prior name. 

 It should be specifically understood however that another formation 

 in California, the Lower Vaqueros, /. e., the zone of the beds in the 

 Las Vaqueros Valley, to which the name Vaqueros was applied by 

 Hamlin*^ and from which were obtained such species as Mytilus 

 cxpansiis Arn., Ostrea cf. Tayloriana Gabb, Ostrea cf. Titan Conr., 

 Pecten magnolia Conr., and Turritella inecana Conr., are not in- 

 cluded in the ^Monterey. This formation lies unconformably below 

 the Monterey in the Santa Monica Alountains, in the Santa Clara 

 River Valley (where it is more particularly characterized by Scutella 

 fairbanksi Arn.), and in the Santa Cruz Mountains. For it the name 

 Vaqueros is retained. 



Perhaps the only objection to the use of the term " Monterey 

 Formation," and certainly not an important one from a palseonto- 



3^ Species characteristic of this horizon. 



3^ Species still living. 



40 5m//. Geo!. Soc. Am., XVIII., 1906, p. 461. 



*i Water Supply Paper 89, U. S. Geol. Sur., 1904, p. 14. 



