THE CONTINENTAL GLACIERS OF THE "ICE AGE" 313 



PIG. 337. Map of the vicinity of Devils Lake, Wisconsin, located within a reen- 

 trant of the "kettle" moraine upon the margin of the Driftless Area. The lake 

 lies within an earlier channel of the Wisconsin River which has been blocked at 

 both ends, first by the glacier and later by its moraine. The stippled area upon 

 the heights and next the moraine represents the clay deposits of a former lake 

 (based on map by Salisbury and At wood). 



PIG. 338. Moraine with outwash apron in front, the latter in part eroded by a 

 river. Westergotland, Sweden (after H. Munthe). 



