NEOCENE STRATIGRAPHY. 20l 



Navy Point, Benicia, and from San Francisco to the 

 Pacific. He names and describes the San Francisco 

 sandstone, abundant at San Francisco and elsewhere. He 

 assigns it to the Tertiary, though a portion of the Upper 

 Cretaceous may be represented. He describes alluvial 

 deposits about San Francisco Bay, drift deposits in low 

 passes in San Francisco and sand dunes in the same place. 

 From finding "Post-Pliocene deposits" at Monterey, 

 Santa Barbara, San Pedro and San Diego, he argues for 

 a very recent uplift of that region. 



Whitney. — During the survey under Prof. Whitney,* 

 the Santa Cruz Mountains were crossed in several direc- 

 tions. His report in a very general way points out the 

 distribution of the different formations in those mount- 

 ains. He makes the metamorphic rocks and San Fran- 

 cisco sandstone Cretaceous, thinks certain shales in the 

 valley near Searsville are Cretaceous, but assingns most 

 of the later rocks of the mountains to the Miocene. He 

 calls the strata between Lake Merced and Mussel Rock 

 Pliocene, overlaid unconformably by post-Pliocene. 



In 1880, in his " Contributions to American Geology," 

 Whitneyt calls attention to the fact that in the Coast Range 

 the movement has produced crushing and breaking, rather 

 than folding and uplifting. He notes Pliocene near San 

 Diego, at north end of San Fernando Valley, uncon- 

 formable on Miocene, and subaerial Pliocene gravels all 

 about the Santa Clara Valley. The Miocene he divides 

 into two groups ; one a fine grained slate or shale often 

 highly bituminous and the other a rather coarse grained 

 sandstone, the latter being the lower member. He makes 



* Geological Survey of California, J. D.Whitney, State Geologist. Geol- 

 ogy, vol. i, 1865, pp. 61 et seq. 



t Auriferous Gravels, J. D. Whitney. Memoirs of Museum of Com- 

 parative Zoology, 1880, pp. 15 et seq. 



