lOO NEW YORK STATE MUSEUM 



vast quantities of waters which flooded the district with lakes. 

 These bodies of water, especially at the higher levels, did not leave 

 distinct shore-line features, for their outlets were controlled by ice 

 lobes which caused constant or periodic lowering of their surfaces. 



The district covered by the glacial lakes here described can be 

 divided into two sections, the western and the eastern. It is con- 

 tended that the western section was the first to be relieved of ice, 

 thus giving birth to the South Meadows lake. The uncovering of 

 lower outlets to the west extinguished this lake which was suc- 

 ceeded by Upper Lake Newman. During this stage the ice lobe 

 that lay in the East branch of the Ausable river, eastern section, 

 retreated to allow the Keene lake to form, with its drainage to the 

 south. Further withdrawal of the lobe uncovered the Wilmington 

 notch and thus the waters of the Keene lake fell to the level of 

 Upper Newman, bringing about a union of the two sections. Suc- 

 ceeding Upper Newman, Lower Newman held the stage until the 

 lobe in the Elizabethtown valley opened the side-outlet channels 

 in the center of the Ausable sheet, then the Saranac glacial waters 

 held dominion, draining east. During the lower stages the western 

 section was drained and only the eastern section was flooded. 



On leaving the higher levels we descend to the better defined 

 shore lines and levels left by lakes whose outlets were over rock. 

 The Wilmington lake, drained through the gulf, and the Upper 

 Jay lake, both upper and lower phases, likewise drained to the east. 

 The impossibility of distinguishing beaches and stream terraces in 

 certain cases leaves in doubt the exact nature of some of the lower 

 levels; the marine plain around Ausable Forks being the most 

 important of the lower series. 



The nature of the postlacustrine uptilting, which inclined the 

 shore lines of the lakes northward, points to the conclusion that 

 the land was experiencing uplift and warping while the ice was 

 retreating from the region. The total amount of uplift since glacial 

 times for the quadrangle was greater than 6oo feet. 



STONE QUARRIES AND MINES 

 The accompanying geologic map shows the locations of nineteen 

 stone quarries and mines or prospect holes. 



Road Metal 



Excellent rooks for use in the construction of macadamized 

 roads occur in inexhaustible quantities within the quadrangle. 



