ELEVENTH ANNUAL REPORT 



\Q"~i OF THE 



UNITED STATES 



Geological and Geographical Survey 



OF 



THE TEEEITOEIES, 



EMBRACING 



IDAHO AND WYOMING, 



MM A mm OF PROGRESS OF THE HPL0RATI08 FOR THE FEAR 



1877.' ■ - 



By F. V. HAYDEN, 



\ 



UNITED STATES GEOLOGIST. 



CONDUCTED UNDER THE AUTHORITY OF THE 

 SECRETARY OF THE INTERIOR. 



WASHINGTON: 

 GOVEEMENT PRINTING OFFICE 



1879. 



