148 University of California Publications in Geology [Vol. 7 



Lower Portion 



Pelecypoda. 



Area obispoana Conrad. 



Glycimerus, sp. 



Leda, compare taphira Dall. 



Modiolus, sp. 



Nueula, sp. 



Pecten peckhami Gabb. 

 Maeoma eongesta Conrad. 

 Venerieardia montereyana Arnold. 

 Sharks teeth. 

 Gasteropoda. 



Ficus kernianum Cooper. 

 Trochita, sp. 



Middle Portion 



Pelecypoda. 



Area obispoana Conrad. 

 Mareia oregonensis Conrad. 

 Macoma eongesta Conrad. 



Upper Portion 



Pelecypoda. 



Marcia oregonensis Conrad. 



Macoma eongesta Conrad. 

 Gasteropoda. 



Neverita, sp. indet. 



Several of the species listed above are of sufficient importance 

 to warrant further consideration. Area obispoana was described 

 by Conrad from a shale formation in the Salinas Valley in San 

 Luis Obispo County, California. The exact locality and horizon 

 are not, at present, definitely known. However, it seems most 

 probable that it was obtained from the shale which immediately 

 overlies the Vaqueros sandstone. It has also been reported from 

 a corresponding horizon in the Santa Cruz Quadrangle. Pecten 

 peckhami Gabb is most commonly found in the lower Miocene. 

 It has been reported from the uppermost Eocene in the Coalinga 

 region, but its occurrence below the lowest Miocene is exceed- 

 ingly rare. Middle Miocene is considered the upper limit of 

 its range. Venerieardia montereyana Arnold was described 

 from the lower middle Miocene shales of the Santa Cruz Quad- 

 rangle ; its occurrence has not been noted outside of this horizon. 



