lyo CALIFORNIA ACADEMY OF SCIENCES [Proc. 3D Ser. 



barnacles. The lower fossiliferous sandstones yielded the 

 following species of invertebrates : 



Lucina borealis Linn. Pecten sp. 



Lucina richthofeni Gabb Solen sp. 



Yoldia cooperi Gabb Tapes sp. 



Mytilus tnathewsoni Gabb Maconia sp. 



Chione niatheiusoni Gabb Ballauus sp. 



Dosinia mathewsojii (?) Gabb Neverita callosa Gabb 



In the light of stratigraphic studies farther north it is 

 evident that the entire series of sands and shales below the 

 Monterey Shales should be regarded as a distinct member of 

 the Miocene, and the name Temblor Beds is suggested to 

 embrace this aggregate of strata, while for the first sandy 

 beds below the Monterey at Temblor the name " Button 

 beds" has been used on account of the great numbers of 

 small discoidal sea urchins (^Astrodapsis) which characterize 

 them here and elsewhere. 



The Temblor Beds are often characterized by sands, 

 more or less distinctly stratified, which are usually rendered 

 highly calcareous by great numbers of fossil invertebrates. 

 Echinoderms are sometimes so abundant that certain beds 

 become almost a limestone. Occasionally pebbly layers are 

 encountered, and at other points the sandstones become 

 noticeably shaly. 



As will be noticed further on, it is not rarely that the 

 Monterey Shales are found resting on older rocks without 

 any appearance of the Temblor Beds intervening. In some 

 places there is a distinct overlapping of the Monterey Shales 

 beyond the borders of the Temblor Beds. 



North of the Canara Springs there is no similar thickness 

 of Miocene strata anywhere in the Mount Diablo Range as 

 far as known to the writer. In the vicinity of the Devil's 

 Den and northward the section is materially reduced, chiefly 

 by the reduction of the Monterey Shales. 



Nowhere north of the Antelope Valley have these shales 

 been found to exceed one thousand feet in thickness, though 

 otherwise they are identical and appear to represent the 

 basal portion of the shales occurring in the Canara Springs 

 section. 



