226 U niversity of California Publications in Geology L VoL - 7 



only mean a peculiarity of geographical distribution of the 

 species. 



The mixture of faunal elements previously supposed charac- 

 teristic of Monterey and Vaqueros respectively may be related 

 to the mixture of oppositional types — bands of diatomaceous 

 shales with intervening sandstones, as in western Contra Costa 

 County. If there really are life-time zones in the Monterey 

 series, it may mean a transitional fauna. In either case it shows 

 the imaginary character of the supposed time independence of 

 the two formations "Monterey shale" and "Vaqueros sandstone" 

 or "Temblor beds." 



But Anderson takes a different view and says "It is quite 

 impossible to recognize in the outcrop in any part of the Kern 

 River area that member of the Miocene which forms its most 

 characteristic feature in many parts of the Coast, that is, the 

 Monterey Shales." 



' ' In the series as described in the preceding pages, . . . there 

 is one portion that bears some resemblance to the Monterey, 

 namely, that portion which is most strongly characterized by 

 shales, some of which are organic to a considerable extent. It 

 will be noticed that nearly every class of materials commonly 

 found in the Monterey has been found in the upper part of the 

 Temblor group" (p. 109). This statement is very interesting 

 when we consider that the actually applied criterion for the 

 "Monterey" has everywhere been the "materials . . . found in 

 the upper part of the Temblor group." 



"But if this collection of strata really represents the Monte- 

 rey, it is hardly comparable in thickness or character to known 

 exposures of Monterey not far away." It may be pointed out 

 here that the change from McKittrick to the Kern is hardly 

 quicker or more marked than the change from McKittrick to- 

 wards Coalinga. 



"Temblor Basin." — Anderson brought out some very import- 

 ant relationships when he showed that the Kern River deposits 

 on the edge of the Sierra Nevada and the deposits along the 

 west side of the San Joaquin Valley about Coalinga and north 

 are along the borders of what I consider the interior portion of 

 the basin of deposition during Monterey time and what he calls 



