200 



816 INDEX TO THE STEATIGEAPHY OF NORTH AMERICA. 



Geological section of the Coast Ranges of California in the vicinity of the Bay of San Francisco. 



Merced : Feet. 



Upper marine sandstones, sandy shales, and clay shales I 



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



Unconformity. 



Campan: 



Volcanics, andesites, basalts, rhyolite agglomerates 1 



Fresh-water conglomerates, sandstones, clays, limestones / 



Uncontormity. 



Upper Berkeleyan : 



Volcauics. basalts, and tuffs 



Siestan, fresh-water clays, limestones, sandstones, shales, lignite, tuffs, conglomerates... 

 Volcanics, andesites, basalts, rhyolite tuffs 



Unconformity. 



Lower Berkeleyan: 



Volcanics, andesites, basalts, rhyolite tuffs \ 



Trampan, marine shales, sandstones, pebbly conglomerates / ' 



Orindaa, fresh-water conglomerates, sandstones, clays, limestones, tuffs 2,400 



Pinole: Tuffs (pumiceous) fossiliferous 1,000 



San Pablo: Blue tuffaceous sandstone, marine 1,500 



Unconformity. 



Monterey: 



Upper: Stage 7 — Sandstone 1,800 



Middle: 



Stage 6 — Bituminous shale 670 



Stage 5— Sandstone 1,200 



Stage 4 — Bituminous shale 460 



Stage 3— Sandstone 600 



Stage 2 — Bituminous shale and chert 250 



Lower: Stage 1 — Sandstone 400 



Unconformity. 



Karquinez: 



Tejon: Massive sandstones 2,100 



Martinez : Massive sandstones 2,200 



Rhyolite flows (age not certainly determined). 



Unconformity. 



Shasta-Chico: 



Chico: Sandstones and shales 3,000-1- 



Oakland : Conglomerate 500 



Peridotite irruptions. 



Knoxville: Shales with subordinate limestone and conglomerate 1,000 



Uncontormity. Volcanics. 



Franciscan : 



Bonita sandstone 1,400 



San Miguel cherts, radiolarian 530 



Marine sandstone 1,000 



Sausalito cherts, radiolarian 900 



Boliuas sandstone (volcanics) 2,000 



Volcanics. 



Calera limestone, foraminiferal 60 



Volcanics. 



Pilarcitos sandstone 790 



Unconformity. 



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



84,290 



In the hills west of Tulare Lake, southern California, lies the Coalinga oil district 

 studied by Arnold and Anderson, ^^"^ who thus describe the post-Eocene formations: 



The periods following the Eocene are here represented by a great series of sandstone, shale- 

 and conglomerate beds, all tilted at about the same angle, having usually similar character, 

 istics, and presenting an appearance of conformity and intergradation. By means, however, of 

 discontinuous fossil faunas, distinguishable lithologic groups, the absence in some places of for- 

 mations or zones known elsewhere, as a result of erosion and the overlappmg of later beds, and 

 the appearance of fragments of older formations witliin younger ones, several important breaks 



