ANCIENT WATER LEVELS OP CHAMPLAIN-HUDSON VALLEYS 147 



partly to summarize the evidence and correlate the delta de- 

 posits of this region. 



The three deltas of the Adirondack Hudson. The Adirondack 

 Hudson river has three deltas of late glacial age at the south- 

 eastern base of the mountains, one at Corinth, one at Gansevoort, 

 and a third at the base of Palmertown mountain. The river flow- 

 ing southAvard through the Precambrian rocks of the Adiron- 

 dacks touches at Corinth on the northern end of a flngerlike pro- 

 jection of the Cambrian and lower Silurian strata let down by 

 faulting within the walls of older rock, but instead of following 

 this tract of newer rock southward to the open ground toward 

 Ballston, the river now turns rather abruptly eastward across a 

 broad tongue of the Precambrian rocks and emerges on the Fort 

 Edward district through a deep gorge in the Adirondack massif 

 just above Glens Falls. 



When the ice sheet in its retreat had its front in this region, 

 the pressure through the Champlain trough appears to have main- 

 tained a barrier of ice against the eastern wall of Palmertown 

 mountain, thus preventing the escape of the river in that direction 

 while the path southward from Corinth was open. Hence the 

 river discharged its waters, laden with gravel and sand, through 

 the broad valley followed by the Adirondack Railroad from 

 Corinth southward. In the earlier stages of the melting of the 

 ice from this valley a very high and massive kame terrace was 

 built on the western margin of the ground held by the delta at the 

 next stage of building. 



These kames with their kettles here and there holding lakelets 

 are very conspicuous for a mile or more south of the railroad 

 station at Corinth. At the time the deposits were formed, ice 

 must have occupied the valley below and have extended eastward 

 l^erhaps in continuity with the sheet lying over the Fort Edward 

 district. 



The village of Corinth stands on the northern edge of the delta 

 which has the form of a rather steeply inclined outwash fan 

 flooring over the valley with its crest on the north overlooking the 

 river. The present examination of the region was not carried 

 beyond this point to determine to what extent the Hudson valley 

 above Corinth was free from ice at the time the delta was formed. 



