U.S. GEOLOGICAL SURVEY 



MONOGRAPH XXV. PL. XVI. 



MAP OF THE GLACIATED AREA OF NORTH AMERICA. 



Scale , aboiit 550 railes lo an iiicU . 



Areas covered bvliandlce durin;^ UieQiKite 



tJuate-ntai-vLaltes BonneviUe andijalioivlan aiid tlie Glacial LakeA^a 



Glacial Curtenl.s known by Striae \ \ \ \ Glacial Cvurrehls known byDriftTi-ansportaticm or otherwise iiileri-ed \ \ N 



JVote.-T/Le dot Led. soul hen I part of the drift are^. i/t.tJie Mississi/ipt aJtct Missouri river basins represe^its tlie drift 

 of the ciLrly Kansa/i and EaM lowan. stages oftjlaciatijow. Tlie. north^i'Ti. boixndary' of this tract notes tJre 

 exUii-t of fjie ice-shfei at Ike. time of hey inning of its moraine- fbrnilng or Sa^stWiscoTtsin stage 



