40 BULLETIN OF THE LABORATORIES 



lowing the shaded portion which represents the present river 

 course, but turns at a right angle and runs through a rock cut 

 150 feet wide, with overhanging walls at both g and c. Just 

 south of c the railroad has made a rock cut 45 feet deep on a 

 very sharp curve in order to get through the gorge. The rock 

 g, known as Black Hand Rock, stands out with a bold front 45 

 feet high and 250 feet long next to the river, where the tow 

 path for the canal had to be blasted out. The rock slopes on 

 top towards the north and presents an overhanging wall about 

 20 feet hicfh on that side. 



Within, the large open area of the unoccupied curve north 

 of g there is a low mass of rock, presenting the form indicated 

 at m with a vertical rock exposure 10 feet high on the south 

 side of the mass and gradually falling off into the lower channel 

 00 which is only 4 to 5 feet above water level. At n and be- 

 tween g and m are ponds of water on a level with the water of 

 the river. The channel between g and m is about 70 feet wide 

 while that between m and L is 200 feet also between g and the 

 vertical cliff H on the east side of the channel is 290 feet. It 

 is stated by some of the oldest inhabitants that before the canal 

 was constructed part of the river water occupied the channel 

 between g and m during high freshets. 



Continuing the large curve L, 00, n southward to R, 

 there is on the east side a long straight bluff SS 45 feet high at 

 the present river front and gradually decreasing to about 8 feet 

 at its southern end. On the high ground between X and this 

 channel there is a light drift covering as indicated by the dotted 

 portion. This drift covers the west wall of the channel except 

 at Y where the rock is exposed. The drift is largely gravel and 

 that part which fills this channel is composed almost entirely of 

 fine sand. At YY there is no escarpment but the high hill 

 presents a very distinct curve as is shown by the contour lines. 

 Between Y, YY, Z and the double cross there is a low drift 

 plain with a form shown by the contours. The river does not 

 follow this low gap which is nowhere over 1 5 feet above its 



