UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 10, No. 6, pp. 75-85 Issued November 18, 1916 



NEW MAMMALIAN FAUNAS FROM MIOCENE 

 SEDIMENTS NEAR TEHACHAPI PASS IN 



THE SOUTHERN SIERRA NEVADA^^]^ 



BY 



JOHN P. BUWALDA 



CONTENTS 



PAGE 



Introduction 75 



Occurrence 76 



Phillips Ranch Fauna 77 



Cache Peak Fauna 80 



Eelationships of the Faunas 81 



Geologic Significance of the Faunas 84 



Introduction 



During the past five years expeditions under the direction of the 

 Department of Palaeontology of the University of California have 

 made considerable collections of Tertiary mammalian fossils in for- 

 mations near Barstow and at Bicardo, in the Mojave Desert. Mam- 

 malian material has also been obtained in sections containing marine 

 formations in the Southern San Joaquin Valley, on the western or 

 opposite side of the southern Sierra Nevada. Study of this material 

 from the Mojave Desert and the San Joaquin Valley has yielded 

 important information regarding the history of mammalian life in 

 these regions. With the geologic data obtained it is being made the 

 basis for a beginning in the correlation of events in the Tertiary 

 palaeontologic and geologic history of the Great Basin and Pacific 

 Coast provinces. 



With a view to contributing to the solution of this general problem 

 of Cenozoic correlation between the Great Basin and Pacific Coast 



