368 STRATIGRAPHICAL GEOLOGY. 



Upon our earlier unpublished maps we distinguished a band of con- 

 torted clay slate, commencing in West Stewartstown and passing north- 

 erly into Quebec along Hall's stream. The structure of this band on 

 Sections XIII, XIV, and Fig. 2, Plate VI, is anticlinal. It joins the Cal- 

 ciferous mica schist, just like the Cambrian in Vermont; and further 

 facts about it have been given upon pages 40-42. I think it best to give 

 this band prominence upon the map, and refer it to the Cambrian series. 

 It often carries minute pebbles, and is full of ferruginous spots, caused, 

 probably, by the decomposition of ankerite or bitter spar. With these 

 minerals gold is also found, thus allying the rock to that in Lyman. 



The Vermont observations represent the Kirby-Waterford range, with 

 easterly dips, mostly from yo°-So°. The notch near its northern end is 

 caused by the existence there of a bunch of granite. There is an abun- 

 dance of material suitable for building purposes in this area, and the rock 

 is quarried at two places in Waterford for slates. 



Concerning the range properly lying within our present field of descrip- 

 tion, we may say that all along the eastern border of the Calciferous mica 

 schist there are many argillaceous bands, so much so that our Vermont 

 official observations led us to connect together the Waterford and Fairlee 

 termini. At Barnet, Newbury, and Bradford the argillaceous bands are 

 prominent. Between the Union church, Newbury (Section VIII), and 

 Bradford village there may be a fault, which has displaced the slates and 

 concealed them from sight. At the north-east end of Fairlee pond these 

 slates are at least two hundred and fifty feet wide, with a high easterly 

 dip. There has been a quarry in this vicinity, upon the land of Amos 

 Waterman, and the slate is said by good judges to be excellent. I have 

 not seen any outcrops on this range, though they undoubtedly exist, till 

 we come to the turn of the road over the hill to Fairlee lake, near Ely 

 station. Both here and in the new road following up the brook, the slates 

 dip about 80° N. 75°-8o° W., and they may be a mile wide. Nearer the 

 station (Ely) the strata arc vertical. In the north-east part of Thetford 

 there is a westerly dip, while at the old Howard quarry the dip is 70°-8o° 

 E. A mile north of the academy the dip is 80° S. 50° E. At the "lead 

 mine" we have also the south-easterly dip. The slate ledges are abun- 

 dant between the mine and Potato hill. Between the academy and Union 

 Village, on the Pompanoosuc river, numerous slate outcrops have been 



