NIAGARA FALLS AND VICINITY 



63 



With the gradual melting away of the great ice sheet, the land 

 on the northeast began to recover from its last great depression, 



Fig. 13 Taylor's map of Lakes Algonquin and Iroquois. 



Fig. 14 Taylor's map of Nipissing great lakes and the Champlain submergence. 



and, though there had been many oscillations, the balance of change 

 was toward a slow but steady elevation of the Laurentian region. 

 As a consequence the beaches of the old glacial lakes, which of 



