140 NEW YORK STATE MUSEUM 



mountain, a lower level about Gleu Lake, a higher one at Pat- 

 ten's ;^^il]s on the north, and those of till at North Argyle and 

 Evausville, which will now be described in the order named. 



Palmertown mountain terrace [see Glens Falls quadrangle, 

 pi. 13; also fig. 18, p. 130]. At the eastern base of Palmertown 

 mountain there is a well develojied terrace rising from 50 to 60 

 feet above the level of 400 feet. This terrace varies from J to J 

 mile in width and near the Hudson river is cast into mounds 

 and kettles proving its deposition in the presence of the depart- 

 ing ice sheet. In its northern part it is a typical kame terrace, 

 and its eastern face or slope marks its original constructional 

 limit against the border of the ice lying south of the present 

 course of the river. 



The materials of the terrace are exceedingly coarse cobble- 

 stones. With an ice barrier stretching across the mouth of the 

 Hudson canyon, the water would be held back and caused to 

 flow out at the lowest point of discharge which appears at this 

 time to have been at Corinth. With the beginning of the retreat 

 of the ice from the mountain Avail the water would find an oppor- 

 tunity to pass along the eastern base of Palmertown mountain 

 southw^ird over the district about Gansevoort. It was apparently 

 during this condition of drainage that the Palmertown mountain 

 terrace arose, the terrace being the then bed of the river, and 

 consequently above sea level. 



Below and east of this terrace stretches another, a broad delta 

 terrace, meeting the base of the earlier deposit at an elevation 

 of 400 feet and probably marking a further marginal retreat of 

 <he ice sheet and a consequent lowering of the level of the glacial 

 Adirondack-Hudson river [see fig. 20, p. 146]. 



Glen Lake kettle terrace. Small isolated terraces occur on the 

 flanks of Luzerne mountain at the 500 foot and even higher 

 levels marking the recession of the ice from the eastern flanks 

 of the Adirondacks south of Lake George. It is not necessary 

 to suj)pose that these deposits were ever much more continuous 

 than they are now but below them at the base of the mountain 

 extends one of the broadest and heaviest though not the longest 

 glacial terraces seen anywhere in the Hudson valley. This 

 deposit incloses Glen Lake, the central and largest example of 



