2IO SURFACE GEOLOGY. 



there can be little doubt as to the south-west direction. Some of the 

 examples given require scrutiny to decide which is the stoss and which 

 the lee side, but all present the same appearances. Perhaps the most 

 satisfactory cases are recently exposed by a clearing midway between 

 the Glen house and the saw-mill, not seen by either Packard or Vose. 

 The rounding on the north sides of the domes here is very conspicuous, 

 while the south sides are rough and uneven, though not so much so as 

 in the most perfect examples of stoss and lee action. At the lower end 

 of the carriage-road the smoothing occupies a broad face of rock 200 feet 

 long and 40 wide, with the north-cast end the most worn. Two miles 

 up this road the markings are on a vertical wall exhibiting a well defined 

 example of the north-east force. A short distance south from the Glen 

 house, where a tributary enters from the south-east, the greatest amount 

 of wearing appears at the angle of the fork, and not upon its sides. 

 All these cases show clearly that the principal force, or that making the 

 striae and jDroducing the embossment, proceeded west of south, and not 

 northerly. There may have been a later current down the valley in the 

 decline of the period, but this did not have strength enough to score 

 the ledges. This later current explains the origin of the immense thick- 

 ness of stratified deposits near the mouth of the Peabody river, called 

 moraines by Packard and Vose. They are relics of the ancient flood 

 plain, produced by the glacial river after the ice had been melted, cer- 

 tainly as far up as the Glen house. These terraces are very conspicuous 

 as far south as the mouth of Miss Barnes's brook, and show differences 

 in coloration like those between the upper and lower till. Mr. Upham 

 agrees with me in this view (see p. 141), without any conference or sug- 

 gestion whatever from me. 



The next examples of the movement west of south occur on the west 

 side of the Presidential range, and seem to connect with the Connecticut 

 Valley movement. It has not been observed in Carroll, probably be- 

 cause of the scarcity of ledges. Observations are also wanting for 

 Whitefield. Bethlehem abounds with them. The north-west slope of 

 the Mt. Agassiz eminence has been powerfully struck and smoothed by 

 it. This current passed over the summit of Mt. Agassiz, and followed 

 some portions of its southern slope. P'rom here southerly the current 

 is merged with that of the Connecticut Valley movement. That seems 



