ELEVENTH ANNUAL REPORT 



OF THE 



<-' '' f UNITED STATES 

 I/. " 1 ' 



Geological and Geographical Survey 



OF 



THE TETmiTORIES, 



EMBRACING 



IDAHO AND "WYOMING, 



BEING A mm OF FBOGEESS OF TIG HPLORATION FOR THE lEAB 



1877. 



By F. Y. HAYDEN, 



UNITED STATES GEOLOGIST. 





CONDUCTED UNDER THE AUTHORITY OF THB 

 SECRETARY OF THB INTERIOR. 



WASHINGTOiS^: 



GrOVEENMENT PRINTING OFFICE. 

 1879. 



