UNIVERSITY OF CALIFORNIA 



Bulletin of the Department of Geology 



Vol. 2, No. 2, pp. 93-100, PI. 3. ANDREW C. LAWSON, Editor 



ON 



SOME PLIOCENE O ST R A CO DA 



PROM 



NEAR BERKELEY, CALIFORNIA, 



BY 



Frederick Chapman. 

 CONTENTS. 



PAGE. 



Geological Relations 93 



Localities 94 



Descriptions 95 



GEOLOGICAL RELATIONS. 



In the latter part of last year Prof. T. Rupert Jones kindly 

 handed to me for description several specimens of rocks of Pliocene 

 age containing numerous Ostracoda. These rock specimens had 

 been sent to Prof. Rupert Jones by Dr. J. C. Merriam, of the 

 University of California, who wished a detailed examination of them 

 to be made, since the Ostracoda appeared to be of exceptional 

 interest. In one of the letters accompanying the specimens Dr. 

 Merriam says: "The Ostracoda occur at several horizons in the 

 Pliocene near Berkeley, California. Some of the fossiliferous beds 

 are important geological features of the country, and extend for 

 several miles through a region in which few other invertebrate fos- 

 sils are known." 



For this reason Dr. Merriam thinks the Ostracoda may be of 

 considerable use in determining horizons. 



The following note on the Ostracod-bearing rocks has since 

 been kindly furnished by Dr. Merriam. I quote it here in full : — 



"The Ostracods occur in a very thick series of conglomerates, 



(93) 



