206 



THE ICE AGE IN NORTH AMERICA. 



many as eight of those examined by Professor Koons were 

 upward of eight hundred feet long and about half as wide; 

 the rims from seventy-five to a hundred feet high. 



Fig. 66— -Map of western New York, showing distribution of morainal deposits. (From 

 U. S. Geological Survey.) 



West of the Hudson Valley, as we have already seen, it 

 is difficult to trace a well-defined and continuous moraine 

 along the extreme glacial boundary. Such a moraine is 

 pretty well made out across New Jersey and a portion of the 

 distance between the Delaware and Susquehanna Rivers in 

 Pennsylvania ; but, beyond, the country is mountainous, and 

 through a considerable portion of the way difficult of ex- 

 ploration. Through central New York, however, there are 

 specially marked accumulations of glacial debris near the 

 water-partings between the St. Lawrence and Mohawk Val- 

 leys and that of the Susquehanna. President Chamberlin is 

 inclined to correlate the accumulations just south of the 

 " Finger Lakes " of that region f with the interior moraine 



f "Preliminary Paper on the Terminal Moraine of the Second 

 Glacial Epoch," p. 353. 



