U. S. GEOLOGICAL SURVEY 
BULLETIN 611 
PLATE V 
B. 
as the turf 
tittle 
EROSION FORMS OF NORTH DAKOTA 
ved fro 
le stiehin of water | tart a pais "vertically 
bove, resembles a gigantic s 
and t 
slopes are cut soap 4 sr rain. 
seen fro 
wn in the upper v 
ced to an ‘ablated butte, as Feet 
erosion pail 
in — lower view, 
