UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 20, pp. 387-396, pis. 16-21 Issued October 31, 1913 



RECENT OBSERVATIONS ON THE MODE OF 

 ACCUMULATION OF THE PLEISTOCENE 

 BONE DEPOSITS OF RANCHO 

 LA BREA 



BY I 



EEGINALD C. STONEE 



CONTENTS 



PAGE 



Introduction 387 



Description of Localities Investigated 388 



Locality 2050 388 



Locality 2051 389 



Locality 2052 391 



General Conclusions as to the Mode of Accumulation at the Localities 



Investigated 392 



INTEODUCTION 



Beginning in 1906, the University of California has collected 

 in the Pleistocene mammal beds at Rancho La Brea at irregular 

 intervals up to 1913. The Los Angeles Normal School, Los 

 Angeles High School, and the Southern California Academy of 

 Sciences have also collected a large quantity of bones from these 

 deposits. During the past winter the University of California 

 engaged in excavation work at Rancho La Brea on a much more 

 extensive scale than in previous years. A careful working over 

 of the material found before this time indicated that certain of 

 the rarer animals wovdd be obtained only by examination of a 

 much larger collection than had been available up to that time. 



