14() NEW YORK STATE MUSEUM 



are seen on the surface of the delta in the sand dunes which have 

 there developed. 



Along the southeastern border of the delta the land drops off 

 to a clayey terrace lying between 250 and 280 feet in elevation. 

 It is well exhibited at lieynolds Corners [see pi. 13]. The slope 

 from the 350 foot delta i)lain to this lower terrace from Fort 

 Edward southward coincides closely with the boundary between 

 the Calciferous-Trenton limestones and the Hudson rivei* shales 

 which lie on the east of them. But the immediate origin of the 

 slope appears to be due to erosion taking place subsequent to 

 the formation of the 350 foot delta. This lower terrace corre 

 spends in position with a tilted water plane of a glacial lake 

 whose outlet on the south, as is shown on plate 28, was in the 



PALMERTOWW ^CV- ' r 



^ MT. ,-" '- 



A -'' TERRACE HUDSON 



^ ^ J' c RIVER 



a 



::^^:d 



Fig. 20 Profile of the terraces and delta levels from the base of Palmertown mountain 

 to the Hudson river, a. The glacial terrace; b, the broader terrace at 400 feet; c, the 

 delta of the Hudson ; d, the claj^ terrace, a part of the channel of the stream which flowed 

 through the Coveville outlet 



old channel back of Schuylerville which falls into the Hudson 

 gorge at Coveville. 



Below the level of this terrace is the old channel continuing 

 the Hudson gorge by way of the Wood creek valley to Lake 

 Champlain, the evident path of a river which as I shall hope to 

 show later in this report drained a glacial lake in the Champlain 

 valley into the Hudson gorge. East of this channel is a branch 

 at a somewhat higher level perhaps earlier occupied by the same 

 stream before that nearer Fort Edward was so deeply excavated. 



The above diagram, figure 20, is intended to show by an east 

 and west profile tlie successive terrace and delta levels of the 

 Fort Edward district, down to the existing channel of the Hud- 

 son below the site of the old fort. 



The effect of ice barriers and glacial lakes about the south- 

 eastern base of the Adirondaeks is so well exhibited in the case 

 of the Hudson river that the following digression is introduced 



