BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 3, PP. 413-444, PL. 13 AUGUST 8, 1892 



STRATIGRAPHY AND SUCCESSION OF THE ROCKS OF THE 

 SIERRA NEVADA OF CALIFORNIA. 



BY JAMES E. MILLS. 



{Presented before the Society December 29, 1891.) 

 CONTENTS. 



Page 



Introduction 414 



( reneral Character of the Sierra Rocks 414 



Division into two unconformable < i roups 415 



< Jeneral Stratigraphy 415 



< reneral Features of the Sierra 415 



Dual Character of the Range 415 



Approximate ( !oincidence of successive Axes of Uplift 416 



Position of < >utcrops relative to Axes of Uplift 417 



Axes of greatest Uplifting 418 



Relative vertical I >escent of eastern and western Slopes 418 



Strike and Dip 418 



Unconformity of the Mesozoic and pre-Mesozi »ic 418 



Epoch of Tilting 419 



Character and Extent of Uplifting 410 



The District more particularly described 420 



Pre-Mesozoic Rocks 421 



Eruptive Granite 421 



Sedimentary Slates and < iuartzites 421 



Pre-Mesozoic Rocks outside of upper Feather River District 42.°> 



Age of the pre-Mesozoic I locks 424 



Mesozoic Rocks 425 



Principal Divisions 425 



Lower Mesozoic Subgroup 42i> 



Slates. < rreenstones and Limestones 426 



Possiliferous Limestones 428 



Jurassic or later Age of the Fossils 428 



Mesozoic < Jonglomerate containing older Locks 429 



Unconformity on. Claremont 430 



Upper Mesozoic Subgroup 430 



Thinly laminated Slates and Serpentines 430 



Sel'| icnt i lie 431 



UpperSlates 432 



Li i not ones 4:!:l 



I, VI I I'.i i i Gkoi Soc \m . Vol.. ::. 1801. ' U3) 



