1913] 



Louderback: The Monterey Series 



229 



by unconformably overlapping formations has not been deter- 

 mined. The character of the material composing the Miocene 

 section gives some weight to the belief that the greater prox- 

 imity of this area to the mountain belt caused a nearer approach 

 to shore line conditions and the deposition here of coarser sedi- 

 ments in place of part of the purely organic deposits of the 

 Temblor Range" (p. 116). 



The deposits here described are on the north side of the 

 mountainous area to the south of which the rocks of the Santa 

 Clara region were deposited, and the great increase in terri- 

 genous material on their approach from the south has already 

 been described. 78 



There seems no reason to doubt that much if not all of the 

 earthy shale and sand of the San Emigdio region is contempor- 

 aneous with the biogenic shales to the north and west. Ander- 

 son's description supplements well the study on the south side 

 of the mountains, connects the Sunset and Kern regions, and 

 indicates the general position of the extreme shore line of the 

 Monterey epicontinental sea. 



Miocene Invertebrate Fossils, J. P. Smith, 1912. — Professor 

 J. P. Smith has recently published a general statement 79 of the 

 "Geologic Range of Miocene Invertebrate Fossils of California," 

 in which he takes a stand on the Miocene faunas quite at vari- 

 ance with his former views and those of Anderson, Arnold and 

 others, but much more in harmony with the stratigraphic conclu- 

 sions of the present paper. 



He says : ' ' Later writers . . . have introduced a much more 

 elaborate classification of the Neocene of California, and a large 

 number of formation names. But these so-called formations, 

 however useful they may be for areal mapping and for economic 

 geology, do not always correspond to faunal divisions. Some 

 of them are merely different f acies of the same thing. ' ' 



"Instead of the numerous subdivisions recognized by most 

 stratigraphers, there are, in fact, only two major faunal units 

 in the Miocene of California: a lower, including all the faunas 

 up through the Monterey ; and an upper, including the San Pablo, 



78 Part I of this paper, pp. 187 and 188. 



ro Cal. Acad. Sci. Proc, 4th Ser., vol. Ill, pp. 161-182, April, 1912. 



