620 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



On the south the i)Laiii ends very abruptl}^ over the Ijasin in whicli hes 

 the A-iUag-e of Gill, and Dry Brook has been kept up to the level of the 

 plain by a reef of schist which rises in its front edg-e and over which the 

 brook falls rapidly into the rounded valley below. The latter is a high 

 basin, with sides and bottom of till, and how far it has been filled up to the 

 flood-plain \eve\ and then cleared out again by Dry Brook and its many 

 tributaries it is hard to decide. 



Westward across Dry Brook the high plain is soon again supported 

 on the south side by high ground, as well as on the north, and soon 

 begins to develop kettle-holes and merges into a kame area exactly as 

 described in the last section. Its sm-face dips very slightly westward, it 

 being 39(3 feet high at its eastern side, 392 feet at its western border, where 

 it begins to break up into kettle-holes, and 389 feet farther west in the 

 middle of the kame area. 



To one looking down on this broad area of intricately reticulated 

 gra^•el ridges, short kames, and interrupted })lains, the whole forming a 

 typical "kame landscape," it seems clear, from the configuration of the sur- 

 face and the trend of the broken ridges, that the current flowed west into 

 the Greenfield l)asin. A restored surface carried through the highest por- 

 tions of the ridges sags along the middle and cuts the high ground north 

 and south like a shore line. 



Tlie material also in the pass consists largely of pebbles — mostly under 

 6 inches in diameter, but some a foot long, in part quite well worn but in 

 part only battered — of the common gneiss and quartzite which abound in 

 the main valley farther north. Westward beyond the narrows the gravels 

 grow inuch finer. 



In the western part of the kame area in and south of the village of 

 Bernardston the pebbles are almost exclusively of the dark mica-schist and 

 the black argillite which occur wholl}- northwest of this point. This is 

 notably the case in the "Bernardston picnic grove," south of the railroad 

 station, Avhere is the north end of a continuous esker which extends a mile 

 or more southwest into the Greenfield basin. Here the pebbles rareh" 

 exceed 4 to 6 inches, and are as finely worn into flattened discoid and 

 ovoid forms as on a sea l^each. 



A kame ridge where the road branches north, just before it goes down 

 over the bridge to enter Bernardston village (opposite E. M. Slate's), gave 



