1917] Nomland : The Etchegoin Pliocene of Middle California 213 



LIST OF INVEBTEBKATES FBOM THE "JACALITOS" OB LOWEB 

 ETCHEGOIN — (Concluded) 



ce 0-t j3 c 



Cfi OS : Ph 



Murex perangulatus Nomland 



Murex tethys, n. sp 



Nassa calif orniana (Conrad) x x 



Natica orbicularis Nomland x 



Natica recluziana Petit x x x x 



Olivella biplicata Sowerby x x 



Purpura turris Nomland x 



Sinum scopulosum (Conrad) x x x 



Thais kettlemanensis Arnolil .... x 



Thais lamellosa (Gmelin) x x 



Trophon belcheri avitum, n. var 



Trophon coalingense Arnold x 



Trophon magister Nomland x 



Turris carpenteriana (Gabb) x 



Turris coalingensis (Arnold) x 



Turris tryoniana (Gabb) x 



Turritella nova Nomland 



ClRRIPEDIA 



Balanus concavus Bronn x x 



Tamiosoma gregaria Conrad x .... x 



At a number of localities in the Jacalitos Hills and Kreyenhagen 

 Hills in beds of the lower middle Etchegoin a faunal assemblage has 

 been found characterized by several species unknown at other horizons 

 of the formation. This fauna, known as the Turritella nova zone, is 

 found typically developed at locality 2533. At this station the fauna 

 consists of very large specimens of Pecten oweni Arnold, Pecten 

 terminus Arnold, and Phacoides annulatus (Reeve). Well-preserved 

 specimens of P. terminus may be found which have the very unusual 

 width of 145 mm. Associated with these species are numerous gas- 

 tropods such as Ficus nodiferous Gabb, Turris carpenteriana (Gabb), 

 Turris tryoniana (Gabb), and Turritella nova Nomland. 



The most easily recognizable by its faunal assemblage and the most 

 persistent in areal extent in the Etchegoin is the Pecten coalingensis 

 zone. The name was first applied by Arnold to a zone occurring 

 in the Kettleman Hills and in the Jacalitos Hills about 800 feet 

 below the summit of the formation. Subsequent work by the writer 

 has shown that this faunal association, occurring at approximately 



