rl2 NEW YORK STATE MUSEUM 



quite early in the disappearance of the ice about the southern 

 flanks of the Adirondacks discharged at Corinth southward 

 toward Saratoga, being prevented from an eastward discharge 

 by the ice on the southeast base of the mountains, and that with 

 the retreat of the ice from Palmertown mountain the Hudson 

 escaped from the gorge at that mountain and, turning abruptly 

 southward, spread out a sandy delta in the region of Ganse- 

 voort. This delta is now largely an area of shifting sand dunes 

 like that of the ancient Mohawk delta between Albanv and 

 Schenectady. Later, with the melting out of the ice over the 

 Fort Edward plains, the river fell into its existing channel, first 

 building another sand delta at the eastern base of Palmertown' 

 mountain, forming the sand tract south of Glens Falls. Thus 

 the Adirondack-Hudson has three large glacial deltas built in 

 successive stages of the disappearance of ice barriers about 

 the southeast versant of the Adirondacks and before the 

 melting out of the glacier from Lake Champlain; hence 

 all of them, unless it be the last named, are older than 

 the Champlain marine deposits. Further examination of 

 the region about Fort Edward and Schuylerville served 

 to show that the upper Albany clays are interrupted in their 

 northward extension between these two places, and that the 

 low lying clays about the former place had been advanced on 

 by the ice while the higher lying clays to the south had not. 

 As the higher clays extend northward to the line where signs 

 of overriding ice appear, it is inferred that the ice formed a 

 barrier on the north to the deposition of the higher clays which 

 extend southward to Albany and beyond. A corollary of this 

 conclusion is that the so called Albany clays are somewhat 

 earlier in age than the typical marine clays of the Champlain 

 valley, which could not have been deposited before the ice sheet 

 had melted out of that valley. 



These observations agree perfectly with the history of the 

 development of glacial deposits in the longer known glacial dis- 

 tricts on the east and west, in which it has been shown that the 

 late Pleistocene deposits occur in stages, earlier on the south 



