NORTH AMERICA IN THE ICE PERIOD. 3 



In the country east of the Mississippi the evidence of ancient glaci- 

 ation is even more wide-spread and impressive than in the far West. 

 The surface-rocks of Canada, New England, New York, and the greater 

 part of Ohio, Indiana, Illinois, and Wisconsin, bear marks of ice-action, 

 and are generally covered with a sheet of drift material which has been 

 carried from the north southward, often many hundred miles. This 





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glaciated and drift-covered area extends from Maine and Massachu- 

 setts in a belt parallel with the arch of the Canadian highlands five 

 hundred miles wide and more than two thousand miles long. Its ex- 

 tension northward from the head-waters of the Mississippi has not 

 been traced farther than Lake Winnipeg, where it was studied by 



