470 NEW YORK STATE MUSEUM 



sand, or silt, with a stratified structure. The first class comprises 

 what is generally known as till, and as boulder clay, and is generally 

 sprinkled over the surface. The stratified deposits overlie the thin 

 till covering, but the two were probably laid down contemporane- 

 ously in different localities, some till being formed at the margin 

 of the ice at the same time that aqueous deposits were gathering 

 farther from its edge. No true moraines were found within the 

 limits of this quadrangle. Ridges of rounded glacial hills occur in 

 several localities, but they all proved to be of fine stratified material. 



The region lay so far within the ice sheet that any deposits formed 

 in its advance would subsequently have been removed, and the same 

 would be true of any earlier gravels which may once have been there. 

 The surviving deposits belong to the time of retreat and melting of 

 the ice, at the close of its last invasion. 



The erosion history and glacial phenomena of the Adirondacks as 

 a whole were summarized by the writer in a recent paper.^ In this 

 paper it was shown that the general direction of ice movement was 

 toward the southwest ; that the motion was vigorous among the out- 

 lying lower hills, but that among the higher mountains the ice was 

 stagnant in the bottoms of the deep valleys, while at the time of the 

 maximum extension of the ice sheet it passed over the tops of these 

 filled valleys smoothing the mountain summits. It was further 

 shown that the glacial deposits belong in general to the time of 

 retreat and melting of the ice, being largely of stratified material. 



The Paradox Lake quadrangle lies on the border between the 

 regions exhibiting the two types of glaciation. Its northwestern 

 part lies in the region of high peaks and deep valleys, where there 

 is little sign of glaciation except in the smoothed tops of the moun- 

 tains. The more southerly and easterly parts of the quadrangle 

 were in the region of the southwesterly moving ice current, hence 

 smoothed rock faces and roches moutonnees are common, as are also 

 glacial deposits. 



Crown Point. In the northeastern corner of the quadrangle, 900 

 feet above sea, in the valley about two miles south of Towner pond 



* On Glacial Phenomena in the Adirondacks, Jour. Geol. v. 10 April-May, 

 1901. 



