514 W. UPHAM STAGES OF THE ICE AGE 



reach thence southward, over the basins of Lakes Huron and Michigan, 

 nearly or quite to the Ohio Eiver and westward across Minnesota. 

 Through all the later and longer part of the Ice Age the Labradorian 

 and Keewatin glacial currents passed transversely across those early 

 courses of dispersion of Patrician drift. 



