RECESSIONAL ICE BORDERS IN BERKSHIRE, MASS. 355 



east of Great Barrington. Part of this series is somewhat less 

 distinct than the preceding, but still is clear enough, and here 

 we have four branching series of six terminating in No. 8, which 

 is well determined as a continuous line. 



In order to get the best possible basis for carrying the ice- 

 borders by interpolation across Mount Washington, it was 

 necessary to extend investigations some distance to the south 

 beyond the limits of the quadrangle. The Housatonic valley 

 passes close along the base of the mountain on the east, and the 

 Copake valley along its west side in New York. In the latter 

 valley there is a fine series of terminal deposits, which may be 

 counted from the north, beginning with the Lenoxdale moraine 

 at Hillsdale as No. 8. The seventh, then, is at Copake Furnace, 

 the sixth at Boston Corners, the fifth about two miles north of 

 Millerton, the fourth at Indian Lake, and the third at Sharon, 

 Conn. This is as far as this series has been made out, but it is 

 as strong and distinct as the series in the Farmington valley. 

 At Sharon, and for three miles northeast, there is a well-defined 

 moraine running along the edge of a bench near the northwest 

 base of a mountain ridge extending in the same direction. The 

 ridge is east of the moraine, and between the two there is a well- 

 defined abandoned river bed averaging about an eighth of a 

 mile wide. Beardsley pond lies in the course of this channel. 

 The east side of the moraine facing the river bed is gravelly and 

 sandy most of the way. At a point about three miles northeast 

 of Sharon the river bed seems to have an abrupt beginning on 

 the brow of a low ridge, overlooking Beaslick pond to the north 

 100 feet lower. There is no sign of such a river bed in that 

 direction. The moraine turns to the north a mile south of the 

 pond and changes its character, becoming a heavy till ridge of 

 smooth form with very little sand or gravel. East of this ridge, 

 and separated from it by the sharp depression in which Beaslick 

 brook fllows, is another heavy, smooth till ridge of precisely simi- 

 lar character. These ridges are about eighty feet above the 

 adjacent low ground, but may not be wholly composed of drift. 

 North of the pond these ridges are nearly parallel, but at the 

 pond they diverge and turn away in opposite directions. The 



