Vol. 4] Osmont. — Geological Section of Coast Ranges. 



53 



ville rests on serpentine at Knoxville and at Wooden Valley. 

 Wooden Valley is probably near the base of the Knoxville series, 

 since at the lower end of Capell Valley, about three miles north of 

 section BB, a bed of heavy conglomerate at least 100 feet thick 

 occurs in the formation. This conglomerate seemed to be made up 

 practically of Franciscan chert and old eruptives, and of course 

 points to an erosion interval between the two formations. 



TEJON. 



Yellow Sandstones on Carneros Creek. — Just east of Carneros 

 Creek, about midway between Napa City and Sonoma, occurs 

 an exposure of yellow to buff colored, massive sandstone, occa- 

 sionally interbedded with buff colored shales. Apparently it 

 dips beneath an exposure of blue San Pablo sandstone to the 

 west, but no good exposures were observed to show the exact 

 relation. The fossils found here were too imperfect for certain 

 identification, but at Thompson's, two miles to the southeast, 

 directly on the line of strike, in sandstone of identical appear- 

 ance, C. E. Weaver has collected and determined the following 

 Tejon species : 



Leda gabbi Con. 



Cardium breweri Gabb. 



Merctrix uvasana Con. 



Tapes conradiana Gabb. 



Tellina lioffmani Gabb. 

 These strata extend only a mile or two north of this point, 

 and are, so far as the writer is aware, the only strata of Eocene 

 age represented in his territory. 



MONTEREY. 



Point Reyes Peninsula. — According to Anderson,* the sur- 

 face of the orographic granite block of Point Reyes Peninsula 

 is a shallow basin or trough, upon which rests a broad syncline 

 made up of sandstone and the characteristic and well known bitu- 

 minous shales. This formation occupies large areas to the south 

 in Contra Costa County and southward, but has not been encoun- 

 tered by the writer in any other part of the area under discus- 



*Bull. Dept. Geol., Univ. of Gal., Vol. 2, No. 5. 



