290 G. D. LOUDERBACK — STRUCTURE OF THE HUMBOLDT REGION 



Page 



General characteristics 309 



Microscopical physiography of Summit rock 309 



Another Summit rock 310 



West Base basalt 310 



A nother West Base rock 311 



Resume of petrographical study 311 



Basic dikes 312 



Summary of strati graphic evidence of faulting 312 



Physiographic evidence of faulting .312 



Relationship of structure to range lines and fronts. 312 



The test of erosion forms 313 



Evidence from stream valleys 314 



Evidence from basalt and erosion 315 



Summary 316 



Neighboring areas 317 



Application of previous investigations 317 



Star Peak range 317 



The bedrock complex 317 



The granite and time of its intrusion 317 



Time of granitic intrusion 318 



The superjacent volcanics 319 



Structural and physiographic discordance 319 



Erosion features 319 



Conclusions 319 



Mountain profile 320 



The great transverse valley 320 



Recent faulting 322 



Table mountain and the East range 322 



Location and extent 322 



The bedrock complex ..." 322 



The superjacent volcanics 323 



Hypothesis of upheaval 323 



Test of volcanic distribution 323 



Character of the proof : 323 



Occurrence of secondary blocks 324 



Basalt in the valley of Carson sink 324 



The divide 324 



The basalt province 325 



East side of Table mountain 325 



Resulis of study of the volcanics ; 325 



Physiographic tests . 326 



Form and structure 326 



Erosion features 326 



Conclusions 327 



The Trinity mountains 327 



Extent of investigation 327 



The bedrock complex 327 



The superjacent volcanics 327 



In general 328 



Lone Mountain hills 328 



