662 



THE ICE AGE IN NORTH AMERICA. 



end of the ice-lobe had been melted back a hundred and eighty 

 miles from its farthest extent, and its southwest side, which at 

 first rested on the crest of the Ooteau des Prairies, had retired 

 thirty to fifty miles to the east side of Big Stone Lake and the 

 east part of Yellow Medicine county. During its next stage of 

 retreat this ice-lobe was melted away from the whole of Le 

 Sueur county, and its southeast extremity was withdrawn to 

 Waconia, in Carver county, where it again halted forming its 



Fig. 181. — Map showing the stages of recession of the ice in Minnesota as described in 

 the text. (Upham.) 



sixth or Waconia moraine. The seventh or Dovre moraine 

 marks a pause in its recession when its southeast end rested on 



