UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



THE COPPER DEPOSITS OF THE ROBINSON 

 MINING DISTRICT, NEVADA. 



BY 



Andrew C. Lawson. 



CONTENTS. 



PAGE 



Introduction 288 



The Palaeozoic Eocks 292 



The Carboniferous 292 



The Euth Limestone 292 



Fossils 293 



The Acturus Limestone 294 



The Ely Limestone 295 



The Devonian 295 



White Pine Shale 295 



Nevada Limestone 296 



Correlation with the Eureka Section 297 



General Structure 297 



The Irruptive Eocks 298 



Monzonite Batholith 298 



Age of the Monzonite 303 



Contact Phenomena 304 



Petrographical Character 305 



Chemical Composition 306 



Monzonite Porphyry Dykes 308 



Petrography 308 



Chemical Composition 310 



Relation to Monzonite Batholith 310 



The Copper-bearing Porphyry 311 



Extent 312 



Intrusive Eelations .- 312 



Structure — - 313 



Contact Metamorphism 315 



Petrographical Characters 318 



