Geol.— Vol. II.] _ ANDERSON— STRATIGRAPHIC STUDY 1 73 



evidence, as in the vicinity of the Kimball wells, where the 

 following members occur: 



ft. 



(?) Contra Costa Beds 



Monterey Shales 800 



Domijean Sands (Eocene) 1200 



Ashy beds near the top of the jNIiocene resemble both litho- 

 logicall}' and faunally beds on the baj^-shore north of Pinole 

 Station, Contra Costa County. The following species were 

 collected from these Miocene beds on the west side of Sec. 19, 

 T. 18 S., R. 14 E.: 



Ashy beds. ]Monterey Shales. 



Leda oregona (?) Pecten peckhaini Gabb 



Tellina congesta ( ?) Callista ( ?) sp. 



The Miocene rocks show little evidence of beincf bitu- 

 minous as they are followed northward toward the Cantua 

 Creek, and in fact there is but slight direct evidence that 

 they are bituminous at any point between Coalinga and the 

 Cantua. 



The noteworth}- facts about the Miocene series north of 

 Coalinga as far as followed are the absence of the Temblor 

 Beds and the greatly reduced thickness of the Monterey 

 Shales. Strata of apparently the horizon of the Temblor 

 Beds occur in the Walnut Creek Valle}' west of Mount 

 Diablo, as described by Dr. Merriam.^ 



Later Neocene Beds. 



By far the most important series of strata in the Mount 

 Diablo Range from the view-point of economic geology are 

 the late Tertiary strata, including the probable equivalents of 

 the San Pablo Beds and others with which they are uncon- 

 form.ably related. In this collection of strata the following 

 members are distinguishable, either stratigraphically or fau- 

 nally : 



1 Bull. Dept. Geol. Univ. Calif, v. 3, pp. 377-381. 



