H KRSHEY | 



Quaternary of Southern California . 



127 



as that the time of their deposition deserves to be erected into an 

 epoch . 



Arnold has divided the marine Pleistocene of the Southern 

 California region mainly between two formations, which he 

 designates, respectively, the Lower San Pedro and the Upper 

 San Pedro series. I am unable positively to identify the first 

 with my series inland, although it may correspond, in part at 

 least, with the Red Bluff formation. The Upper San Pedro 

 series seems to include the deposits of the three lower terraces of 

 San Pedro Hill, and perhaps it might be convenient to extend 

 the name, in the form of San Pedran, to the epoch as well. 



Between the Red Bluff and San Pedran epochs we have 

 abundant evidences of an erosion interval, to which belong the 

 middle terraces of San Pedro Hill, but which is perhaps better 

 represented by the valley of the Los Angeles River in the City of 

 Los Angeles. For this I propose the term Los Angela n epoch. 



In constructing a scheme of classification for the California 

 Quaternary, the period of glaciation in the high mountains must 

 not be forgotten. The Glacial epoch is not represented by its 

 characteristic deposits in any part of Southern California so far 

 as I know and its chronologic relation to the deposits of the San 

 Pedran epoch can only be determined by means of erosion 

 studies. Glaciation in extenso of the California mountains is 

 usually referred to the Wisconsin epoch of Eastern States 

 geology. Fairbanks has recently expressed the opinion that the 

 terraces on the coast are more recent in age than the period of 

 glaciation of the Sierra Nevada region,* which is quite the 

 contrary of my view on the subject. Turner is probably as 

 familiar with the glacial phenomena of the Sierra Nevada Range 

 as any one and he has tentatively correlated the oldest glacial 

 deposits that he could find in the region with the older series of 

 terminal moraines of the Wisconsin drift area of the Eastern 

 States."!" It is beyond any possibility of mistake that at least 

 the older of the coastal terraces are pre- Wisconsin in age. 



*The Physiography of California, Bull. Anier. Bur. Geog., vol. 11, Sept. and 

 Dec, 1901. 



tThe Pleistocene Geology of the South Central Sierra Nevada, With Especial 

 Reference to the Origin of Yosemite Valley, Proc. Calif. Acad. Sci., Third Series, 

 vol. 1, No. 9, p. 270. 



