178 NEW YORK STATE MUSEUM 



Ticonderoga as due to a warpiiij;; of tlie crust in the postglacial 

 changes of level.^ A more complete study of all the phenomena 

 involving a correlation of the spillways about Schuylerville 

 with delta and shore lines far to the north makes it more 

 i-easonable to sui)i>ose that these lower deltas on the north of 

 Schuylerville were deposited in succession in the falling water 

 levels of a glacial lake with varying but successively lower out- 

 lets lying between the site of Fort Edward and Stillwater. In 

 this view these lower deltas w^ere not made in the waters of Lake 

 Albany. If Lake Albany extended northward over the Fort 

 Edward district and connected through the passes of the moun- 

 tains with the Champlain valley, its deltas should be found suc- 

 cessively higher on the north somewhere near the altitude of the 

 line of comparison OU' plate 28. Thus on the Fort Ann quadrangle 

 the valley train of gravel and sand in the Mettawee valley above 

 Raceville and about ^liddle Granville lying above the 400 foot con- 

 tour line if not deposited at the Lake Albany level was at least 

 laid down in these side valleys in probable contemporaneity with 

 the later northern phase of this lake. There is a corresponding 

 terrace on the western side of the Hudson valley at the base of 

 Palmertown mountain, evidently an old delta of the Hudson but 

 probably made in the presence of ice remnants in the valley 

 though positive proof of this is now wanting. 



Of shore lines, between the deltas there is no distinct sign of 

 wave action though along the eastern side of the valley a few 

 feet above the upper limit of the main body of the clays there is 

 a zone of smoothened and straightened contouring of the ground, 

 above which unmodified drift surfaces present a noticeable con- 

 trast. This kind of evidence is most marked from the Moordener 

 kill northward past Troy to the Batten kill, a line which coin- 

 cides very closely with the inner and upper margin of the old rock 

 bench of the Hudson valley floor. 



Correlation of Lake Albany icith the western great glacial lakes. 

 Lake Albany received on the north in the portion of its extent 

 lying Avithin the upper Hudson valley several large streams, the 

 MoordencM^ kill, Hoosic river and the Batten kill, coming from 

 the east ; on the west, the Adirondack-Hudson for a time at least, 

 and more than all the drainage of the Mohawk valley. 



»N. Y. State Mus. An. Rep't. 1901. p.rlS. 



