

?3c v. a 





C^a. i 



DEPARTMENT OF THE INTERIOR 



U. S. GEOGRAPHICAL AND GEOLOGICAL SURVEY OF THE ROCKY MOUNTAIN REGION 



J. W. POWELL in Chakge 



V « ^ 3 



REPORT 



ON THE 



GEOLOGY AND EESOUECES 



BLACK HILLS OF DAKOTA 



WITH ATLAS 



10974 



By HENRY NEWTON, E. M., and WALTER P. JENNEY, E. M. 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1880 



