398 STRATIGRAPHICAL GEOLOGY, 



SO as to account for the presence of this segment of mica schist in the 

 midst of Huronian ledges. We have reason to beheve the mica schist 

 possesses the anticlinal form at its recurrence in Connecticut river. On 

 the west bank of the river in Windsor the Calciferous group is present, 

 with its normal appearance and dip of 55° S. 80° E. It continues up on 

 to the flank of Mt. Ascutney. At a quarry at the north-east base of the 

 mountain the dip is 80° E., where the rock is quite argillaceous. At the 

 crossing of Mill brook the rock is micaceous quartzite, like that of Fairlee 

 and the Ely copper mine. The eastern part of Weathersfield shows the 

 Calciferous series, with dips like those in Windsor. The south branch of 

 Bryant's brook, between Kenyon and Wellman's hills in Cornish, shows 

 mica schist, chiefly, with a few beds of limestone, and positions corre- 

 sponding with those along the line of the section. The same general 

 statement will apply to much of the northern part of Claremont west of 

 Bald mountain. At the Lottery bridge over Sugar river, very near the 

 Connecticut and in the valley between two Huronian masses, the lime- 

 stone layers show themselves, dipping on the average 50° W.; but the 

 layers are badly doubled up, as would naturally be expected from their 

 position between older rocks, and also the neighborhood of Mt. Ascut- 

 ney, There is a large precipitous ledge of Calciferous rocks at the high 

 railroad bridge over Sugar river, dipping easterly. 



Fig. 63 shows a section along Sugar river, in Claremont, where details 

 have been carefully worked out. At the west end is the Huronian 

 Barber's mountain, with its irregularities, perhaps an inverted anticlinal. 

 The Calciferous mica schist shows a well marked anticlinal in Trisback 

 hill ; and the facts are best explained by supposing this rock to rest upon 

 the dolomitic and sandy schists to the west. The axis lies just to the 

 west of the mass of the hill, the western dip being 50° S. 75° W. On 

 the east side limestone is unusually abundant. Near the mouth of Red- 

 water brook the dip is east. On arriving at the edge of Claremont village, 

 at the lowest fall of water in Sugar river, where two mills are located, the 

 argillaceous variety of the formation dips 60° S. 70° E. At the dam of 

 the paper-mill the dip is 56° S. 6^° E.; and the rock weathers like the 

 average of this formation in Vermont. At the bridge just above, the 

 strikes N. 20° E,, N. 10° E., and N. 27° E. were measured. Above this 

 bridge the strike N. 20° E. was observed, and also at a dam near two 



