DRAINAGE SYSTEMS AND THE GLACIAL PERIOD. 209 



Lake, is continuous with the trough of the Red River of 

 the North. 



Deferring, however, for a little the explanation of this, 



Mi/a 



Fig. 53. — Map of Mississippi River from Fort Snelling to Minneapolis and the 

 vicinity, showing the extent of the recession of the Falls of St. Anthony since 

 the great Ice age. Notice the greater breadth of the valley of the Minnesota 

 River as described in the text (Winchell). 



