PROCEEDINQS 



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 THE ASSOCIATED HORIZONS OF 



NORTHEASTERN MEXICO* 



BY 



Roy E. Dickerson 



AN» 



William S. W. Kew 



Introduction 



Professor E. T. Bumble has submitted to the California 

 Academy of Sciences for identification and study some Ter- 

 tiary fossils from the gulf coast of Mexico in the vicinity of 

 Tampico and Tuxpan, the greater part of which were collected 

 by Professor E. T. Dumble himself, Professor W. F. Cummins, 

 Mr. Sands, and Mr. Muir. In all cases the fossils were care- 

 fully marked and the localities well described. The collection 

 localities are scattered along the coast both north and south of 

 Tampico for a distance of 500 miles. 



The echinoids are particularly abundant and will doubtless 

 prove to be excellent horizon determiners, because at several 

 localities, they are associated with mollusks whose ranges are 



* The name "San Fernando," originally applied by Prof. E. T. Dumble to these 

 beds, has been found to he preoccupied. Professor Dumble now proposes that they be 

 called the San Rafael beds. 



Printed from the John W. Hendrie Publication Endowment. 



July 30, 1917 



