PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. VII, No. 6, pp. 157-192, pis. 27-31. July 31, 1917 



VI 



CLIMATE AND ITS INFLUENCE UPON THE OLI- 



GOCENE FAUNAS OF THE PACIFIC COAST, WITH 



DESCRIPTIONS OF SOME NEW SPECIES FROM 



THE MOLOPOPHORUS LINCOLNENSIS ZONE* 



BY ROY E. DICKERSON 

 Curator, Department of Invertebrate Paleontology 



CONTENTS 



PAGE 



Introduction and Acknowledgments 158 



Fauna 159 



List of Species from California Academy of Sciences Locality 



181 159 



Climatic Conditions during Lower Oligocene Time 162 



Comparison of the Lower Oligocene Fauna with the Tejon Eocene 



Fauna 164 



Conclusions 165 



Descriptions of New Species 166 



Leda merriami 166 



Area washingtoniana 166 



Glycimeris andersoni 166 



Barbatia gabbi 167 



Cardita (Carditamera) weaveri 167 



Psammobia martini 168 



Astarte perrini 168 



Corbula cowlitzensis 168 



Pitaria clarki 169 



Spisula packardi 169 



Semele reagani 170 



* Printed from the John W. Hendrie Publication Endowment. 



July 31,1917 



