494 



IOWA ACADEMY OP SCIENCE Vol. XXVI, 1919 



R37W I Rsew 



LEGEND 



•—•^•"^ Boundory ofWiscontin Drift 

 Kansan Dnfl-Region to west -Wisconsin Drift-Region to east 



r^^*'^''f^o| Wisconsin Terminal Moraine Topography^ 



P^_-'^l Wisconsin KomeS 



I o „° I Grovel Hills of Konson Dri«VR«?giOn 



^^ Grovel PitJ 



Alluvial Areas 



I ,.•. .,_.] Areas Underlain with Gravel — 



r '*■•'■'•'■'• I Chiefly Dissecte^ Streom Terraces.) 



Pig. 122. — Map of Sac county showing the course of the upper part of Boyer 

 river. Reduced from a portion of Carman's map of Nortliwestern Iowa as pub- 

 lished in volume XXVI, Iowa Geological Survey. 



