84 



GLACIER STKI.E. 



1000 feet above the striae. The force producing the second set was down hill in the direc- 

 tion taken by a small stream. 



The rock most strikingly scored by these opposite forces is represented on Fig. 31. But 

 there are others in the same vicinity, somewhat higher up, which present the same double 

 striation, and which are exhibited in the annexed Map, Plate VIII., Fig. 1, which shows a 

 region on both sides of the crest of the Green Mountains, where we suppose are the 

 marks of ancient glaciers : on the east side on the branches of White River. 



FIG. 31. 



The case of doubly striated rocks on the west side of the mountain near the line between 

 Ripton and Hancock, is a remarkable example of the juxtaposition of drift striae and 

 those which we must regard as produced by a glacier passing down a valley towards Mid- 

 dlebury. We can explain it by no other supposition, and this does meet the case exactly. 

 It is the only example where we have found a valley on the west side of the Green and 

 Hoosac Mountains which seems to have once contained a glacier. Generally the valleys 

 on that side are very short and steep, and there seems hardly room for a glacier. 



As we pass over the crest of the mountain from the spot above described, on the Han- 

 cock road, we strike and pass down a branch of White River. As we emerge from the 

 forest into the cleared land we begin to meet with striae in the bottom of the valley, 

 pointing N. 70 E., the upper side of the ledges being the stoss side, and therefore the 

 agent of erosion was directed down the valley. In three places also, before reaching the 

 main branch of White River, we found accumulations of detritus, stretching across a 

 considerable part of the valley, in the same manner as we find ancient terminal moraines 

 in the valleys of the Alps. We cannot doubt that these in Vermont, which are shown - 

 perhaps not exactly in their true places, as we made no measurement of distances on the 

 accompanying Map, had the same origin. They may in some instances have been more 



