NEOCENE STRATIGRAPHY. 297 



As, however, most of the recent observers agree in 

 placing a marked non-conformity between the metamor- 

 phic rocks and the Cretaceous rocks, with the latter of 

 which the Pescadero series has been thought to, in part, 

 agree, the writer has preferred in this paper to accept 

 their conclusions. 



Occurrence. — The metamorphic sandstone occurs in 

 connection with phthanite or serpentine in most of hills 

 included in the broad belt which extends from Fort Point 

 and Point Lobos southeastward to the bay between Mis- 

 sion Bay and Visitacion Valley. It also forms the south- 

 western flank of the San Bruno Mountains. 



It is found abundantly on the edge of the foothills facing 

 San Francisco Bay from Milbrae to Redwood City; on 

 the ridge which starting from Mussel Rock extends south- 

 east on the west side of San Andreas and Crystal Springs 

 Valleys. Also in Black Mountain and southward, and in 

 general wherever the metamorphic rocks are found. In 

 the Santa Cruz Mountains much of the eastern slope and 

 the highest peaks are made up of the metamorphic sand- 

 stone and associated rocks. 



Relations. — From the lack of bedding or structure it is 

 seldom that any relation can be made out between the 

 metamorphic sandstone and the other formations. The 

 only relation so far observed is that it lies conformably 

 under the phthanite and probably also above. This ap- 

 pears in several of the phthanite hills in San Francisco, 

 notably on Castro Heights. Mr. F. Leslie Ransom.e 

 reports the same relation to exist north of the Golden 

 Gate* and on Angel Island. f 



Correlation. — No fossils have ever been found in the 

 metamorphic sandstone of the San Francisco peninsula. 



*Univ. of Gal., Bull. Geol. Dept., vol. i, pp. 73-74. 

 t Uuiv. of Gal., Bull. Geol. Dept., vol. i, p. 198. 



