THE PLEISTOCENE OR GLACIAL PERIOD 883 



Fig. 588. The Great Lakes at the Algonquin- Iroquois stage. The outlet 

 to the sea is by way of the Mohawk Valley. (Taylor.) 



Fig. 589. A still later stage of the Great Lakes. The sea is thought to 

 have covered the area shaded by lines at the east. (Taylor.) 



