434 STRATIGRAPHICAL GEOLOGY. 



Broad brook in Vernon is an anticlinal in the slate ; and there is reason 

 to believe much of the rock in the neighborhood dips to the west. Fig. 

 69 illustrates the Broad Brook line. 



Another sectional line, across school districts Nos. 4 of Guilford and i 

 and 2 of Vernon, is the following : In the valley of Fall river we find the 

 old slate quarry, that has been known for so many years. This is an 

 anticlinal valley, with dips of 80° N. 80° W. and jf S. 80° E. West 

 of it, in Guilford, is an extensive area of novaculite. There is also an 

 anticlinal, with similar steep sides, near school-house No. i of Vernon. 

 The most eastern outcrops of slate dip at a higher angle to the east 

 than the overlying quartzite. Between the two last sectional lines are 

 abundant slate exposures. The best known of these lines starts from 

 school-house No. 9, in Guilford, and crosses the slate ridge a little north 

 of east to Vernon Centre. This is shown in Fig. 70. At the school- 

 house and its vicinity is the quarry range, dipping 75° S. 20° E., with 

 its bosses of white quartz. On crossing the ridge to school-house No. 

 13, two bands of a white granitic rock, possibly conglomerate, separated 

 by slate, are passed. The last is at the more eastern school-house, 

 dipping south-east. Next succeed a few feet thickness of siliceous 

 limestone, like that belonging to the Calciferous. Associated with these 

 rocks by the school-house are feldspathic sandstones and felsites, and 

 talcose conglomerate. These conglomeratic, feldspathic, and calcareous 

 rocks occupy a breadth of less than a mile. They seem to belong to 

 some older group that is just touched by the erosion of the slates to form 

 the valley of Fall river. Passing into Vernon the older slates reappear, 

 with the usual easterly dip. Towards the top of the hill there is a west- 

 erly dip. A small anticlinal appears near the summit ; and the westerly 

 dip is restored on the crest of the ridge, and continues all the way down 

 the east side. The last ledge of it east of M. Lee's dips 80° W. The 

 first ledge of quartzite succeeding dips 30° N. 50° E. If these observa- 

 tions represent the mutual relations of these two formations, the latter 

 rests very unconformably upon the former. The slates of this ridge are 

 almost black, without lustre, and remind one of the darker slates of Blue- 

 berry hill, Littleton, formerly believed to belong to the Helderberg series, 

 but now referred to the Cambrian. 



At about the crossing of the state line are slates, with a dip of S. 60° 



