TWELFTH ANNUAL REPORT 



OF THE 



UNITED STATES 



Geological and Geographical Survey 



OF 



THE TERHITOIIIES: 



A REPORT OF PROGRESS OF THE EXPLORATION IN 



WYOMING AND IDAHO 



FOR THE YEAR 1878. 



IN TWO PARTS. 

 Part IL 



By F. V. HAYDEN, 



UNITED STATES GEOLOGIST. 



CONDUCTED UNDER THE AUTHOKITT OF THE SECRETARY OF 

 THE INTERIOR. 



WASHIlSrGTOI^: 



GOVERNMENT PRINTING OFFICE. 

 1883. 



