MODIFIED DRIFT ALONG CONTOOCOOK RIVER. 



107 



At Bennington station the kames are very well displayed, forming 

 long and narrow steep ridges. One of these has been here cut through 

 for the railroad, and shows very instructive sections. Its base is 40 

 feet above the river, and its height about 20 feet. Fig. 24 shows the 

 simple transverse section at the south side of the cut; and Fig. 25 shows 



the section on the north side. 

 The east portion of the last is 

 directly transverse, but its west 

 portion is a longitudinal section, 

 extending farther north. 



Fig. 24.— South side. 



Fig. 25. — North side. 

 Sections of a Kame, Bennington Station, M. & K. R. R. 

 Scale, 25 feet to an inch. 



This kame showed the following succession of deposits, beginning at the top : 



1. Coarse yellow gravel, containing pebbles up to 8 inches in diameter ;— thickness, 

 3 to 5 feet. 



2. Fine sand, whitish and yellowish ;— thickness, 3 to 5 feet. 



3. Coarse dark gravel, containing pebbles up to one foot in diameter ;— thickness, 

 3 feet. 



4- Sand, same as No. 2, obscured at bottom by crumbling of the bank ;— thickness, 

 4, perhaps 8, feet. 



A-A. Downfall of strata, with irregular, broken steep slope, against which lies an 

 accumulation of sand. 

 B. Depression of 2 feet, similar to the foregoing (not extending to south side). 

 F. Fault, seen only on south side ;— dislocation of strata, 6 inches. 



Boulders up to seven feet in diameter are rarely found on the top of 

 this kame ; but none were observed embedded in it. It will be noticed 

 that the alternate layers of gravel and sand preserve a nearly uniform 

 thickness throughout the excavation. It should be added that the gravel 

 usually contains no clear sand and the sand no gravel; and that these 

 succeed each other by a sudden change, not by gradual transition. These 

 sections appear to show the deposition of two years, the coarse gravel 

 being brought from the melting ice-sheet by strong summer floods, and 



