66 NEW YORK STATE MUSEUM 



These erratics are frequently seen ; are usually fairly well rounded, 

 though hard and fresh ; and they indicate the presence of consider- 

 able gabbro masses not far to the north or northeast of the lakes. 

 The only other erratics of special interest are those of Cambric 

 rocks in the vicinity of Blackbridge, which were derived from the 

 valley at Wells. 



Till. As usual, within the Precambric rock area, typical boulder 

 clay is rarely met with here, the ground morainic rnaterial almost 

 always being very sandy or gravelly and generally filled with 

 boulders. Such material is of quite common occurrence in the val- 

 leys or along stream channels. A good example may be seen a 

 mile north of Wells, just where the road enters the Elbow creek 

 gorge. About a mile farther along this same road other good de- 

 posits occur. All these consist mostly of heterogeneous mixture of 

 sand, loam and small to large, not very well rounded, boulders, with 

 sometimes suggestions of stratification. This narrow valley or 

 gorge lay at right angles to the direction of ice flow and hence was 

 very favorably situated for accumulation of ground morainic 

 materials. 



Perhaps the most extensive deposits of till occur within a mile 

 of the river (West Branch) on the south side from Whitehouse 

 eastward for three miles. The best exposures may be seen where 

 Ninemile creek cuts through the till showing thickness up to 50 

 or even 100 feet. This valley also lay directly across the main ice 

 current and the conditions for accumulation of till were very favor- 

 able just after the passage of the ice over the high mountain masses 

 on the north side of the river. 



Still other good exposures of till may be seen along the main 

 road which passes through Benson village. Many other less inter- 

 esting examples occur. 



Kames. Good kame areas are seldom seen, though at two places 

 they are especially well developed. One of these is across the river 

 from Wells between the road and the base of the mountain 

 where many kames occur, some reaching heights of 50 to 75 feet. 

 The other good kame area lies along the valley bottom about a mile 

 south of Blackbridge. This is a large group of kame hills more 

 or less merged together and consisting wholly of irregularly strati- 

 fied sand and gravel with a maximum thickness of no less than 100 

 feet. 



No prominent boulder moraines were noted by the writer. 



