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NEW YORK STATE MUSEUM 



ures, except in a few localities in the Lake Placid sheet. The 

 indefinite nature of nearly all the sand plains strongly suggested the 

 work of aggrading glacial streams, but with the discovery of a series 

 of remarkable glacial outlet channels in the center of the Ausable 

 quadrangle whose spillways correlated with almost mathematical 



Fig. 12 The glacial lake succession in the Mount Marcy and adjacent 

 quadrangles. Stage 4. Lower stages of the Saranac glacial waters, altitude 

 of particular phase here represented, 1500 feet. Total range of Saranac 

 glacial waters, 1450 to 1660 feet. 



exactness with the beaches above mentioned the glacial lake origin 

 of the Saranac glacial waters became clear. 



Here we must depart from the confines of the Mount Marcy sheet 

 to understand the history of these conspicuous levels.^ 



1 Ailing, H. L., " The Glacial Lakes and Other Glacial Features of Central 

 Adirondacks," Bui. Geol. Soc. Am., 27:658, and fig. i. 1916. 



