416 



SCIENCE. 



[N. S. Vol. XV. No. 376. 



Merced 



Campan - 



GEOLOGICAL SECTION OF THE COAST KANGES OF CALIFORNIA IN THE VICINITY OF THE BAY OF SAN FRANCISCO. 



ThicknesB. 

 Feet. 

 J Upper marine sandstones, sandy shales and play shales "j 



( Lower marine clays, sandy shales, sandstones, fine pebbly conglomerates J ' 



Unconformity. 



Volcanics, andesites, basalts, rhyolite agglomerates 



Freshwater, conglomerates, sandstones, clays, limestones 500 



Unconformity. 



r Volcanics, basalts and tuffs 

 U. Berkeleyan ■! Siestan, fresh water, clays, limestones, sandstones, shales, lignite, tuffs, conglomerates, 20O 

 [ Volcanics, andesites, basalts, rhyolite tuffs 

 Unconformity. 



I Volcanics, andesites, basalts, rhyolite tuffs 



L. Berkeleyan \ Trampan, marine shales, sandstones, pebbly conglomerates , 2,000 



I Orindan, fresh water conglomerates, sandstones, clays, limestones, tuffs 2,400 



Pinole — Tuffs (pumiceous) fossiliferous ],00O 



San Pablo — Blue tuffaceous sandstone, marine 1,500 



Unconformity. 



Upper Stage 7— Sandstone 1,800' 



I Stage 6 — Bituminous shale 670 

 Stage 5— Sandstone r 1,200 

 Stage 4 — Bituminous shale 460 

 Stage 3— Sandstone 60O 

 Stage 2 — Bituminous shale and chert 250' 



Stage 1— Sandstone 400' 



Monterey 



Shasta-Chico 



- Lower 

 Unconformity. 



_. . J Tejon — Massive sandstones 2,100 



\ Martinez — Massive sandstones 2, 200 



Rhyolite flows. (Age not certainly determined). 

 Unconformity. 



Chico — Sandstones and shales 3,000-f- 



Oakland — Conglomerate 500 



Peridotite irruptions. 



Knoxville — Shales with subordinate limestone and conglomerate ; 1,000 



Unconformity. Volcanics. 



Bonita sandstone 1,400' 



San Miguel cherts, radiolarian 530 



Marin sandstone 1,000' 



Sausalito cherts, radiolarian 900 



Bolinas sandstone (volcanics) 2,000 



Volcanics. 



Calera limestone, foraminiferal 60 



Volcanics. 

 Pilarcitos sandstone 790 



34,290 

 Unconformity. 

 Montara granite (correlated tentatively with late Jurassic granite of Sierra Nevada). 



Franciscan 



and partly on the basis of their fossil 

 fauna. 



A Contribution to the Petrography of the 

 John Day Basin: P. C. Calkins, Berke- 

 ley, Cal. 



The paper is based on a study of speci- 

 mens gathered du^ring the last three sum- 

 mers, by the University paleontologieal 

 expeditions conducted by Dr. J. C. Mer- 

 riam. It may be considered as a supple- 

 ment to Dr. Merriam 's ' Contribution to the 



