268 University of California Publications in Geology [Vol. 12 



can not be reached in any of the types nor is generic recognition pos- 

 sible in two of them. Nevertheless, the collection is of decided interest, 

 not only because it indicates perhaps the earliest Tertiary mammalian 

 assemblage of definite stratigraphic position as yet known from Cali- 

 fornia, but also because it will aid materially in establishing a more 

 nearly complete correlation between AVest Coast marine deposits and 

 Tertiary beds of the Great Basin and of the Great Plains. 



Fi;^'. 1. Map of southern end of San Joaquin Valley, California, showing 

 general location (x) of mammal-bearing beds in Tec-uja Canon. The base line of 

 the map is apijroximately east-west. 



Occurrence and Nature of Fossil Remains 



B. L. Clark and others who have examined the sequence of Tertiary 

 sediments in the vicinity of Tecuja Caflon, consider the Monterey 

 Series as here exposed to consist in its basal part of land-laid beds in 

 which red colored sandstones and shales are the most striking lithologic 

 members. Lavas and tuffs are also present. These deposits appar- 

 ently pass upward into marine sediments without evidence of uncon- 

 formity. It has been noted, however, that the marine phase of the 

 Llonterey above the red beds was introduced, at least in this region, 

 by the formation of conglomerates which occur at several horizons. 

 The vertebrate remains were all obtained from the red colored strata 

 at the base of the section. 



