f A, Economic Geology, 56 

 Professional Paper No. 42 Series \ 



( B, Descriptive Geology, 65 



DEPARTMENT OF THE INTERIOR 



UNITED STATES GEOLOGICAL SURVEY 



>J^ 



CHARLKS I). \VALCOTT, DIRECTOR 



GEOLOGY 



OF THE 



1WOPAH MINIM DISTRICT, NEVADA 



BY 



1 SFtJRR 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1 it 5 



