UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 16, pp. 243-269 ANDREW C. LAWSON, Editor 



STRATIGRAPHY AND PALAEONTOLOGY 

 OF THE SAN PABLO FORMATION IN 

 MIDDLE CALIFORNIA. 



BY 



Charles E. Weaver. 



CONTENTS. 



PAGE 



Introduction 243 



Historical Review 244 



Geographic Distribution 249 



Stratigraphic Relations 250 



San Pablo Section 250 



North of Mt. Diablo 252 



South of Mt. Diablo 253 



San Ramon Valley Region 254 



Corral Hollow 256 



North of Karquinez Straits 256 



Original Extent of Deposits 257 



Correlation 258 



Summary 269 



INTRODUCTION. 



One of the many problems connected with the interpretation 

 of the Tertiary stratigraphy and palaeontology of middle Cali- 

 fornia is the relation of the San Pablo formation to the other 

 Tertiary horizons. Just what division of the Calif ornian Tertiary 

 the San Pablo formation represents has not been universally 

 agreed upon, neither is it certain what constitutes the base and 

 top of the formation. The chief aim of this investigation has 



