F»ROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. VII, No. 5, pp. 125-156, pis. 17-26a. July 30, 1917 



V 



The Fauna of a Medial Tertiary Formation 



and tlie Associated Horizons of 



Northeastern Mexico 



Roy E. Dickerson and William S. W. Kew 



PRINTED FROM THE 

 JOHN W. HENDRIE PUBLICATION ENDOWMENT 



SAN FRANCISCO 



PUKLISHKD BV THE ACADEMY 

 1917 



