644 STRATIGRAPHICAL GEOLOGY. 



Bradford, where is another patch of mica schist. Other axes occur just 

 to the north of Murdo hill, East Washington, and perhaps at Washington 

 village, the western border of the gneiss. Part of this section has been 

 given in Fig. 85. The west part of Washington is occupied by the 

 usual Lake gneiss of the country west of the porphyritic dividing ridge. 

 The strata everywhere stand nearly vertical. Near its western border the 

 porphyritic gneiss reappears in what has been called the Marlow range. 

 West is the Lempster mountain range of mica schist, carrying the very 

 coarse granite veins from which mica is obtained in merchantable quan- 

 tity. The dips are all easterly. 



The greater part of Lempster and the east of Acworth belong to the 

 Lake or common gneiss, as described in Chapter V. Many dips are south- 

 erly at small angles, so that one or more folded axes may be made out. 

 The western border of the ancient gneisses is reached near Lynn in Ac- 

 worth ; after which Coos mica schists and quartzites prevail to the Con- 

 necticut river through Acworth and Charlestown. These rocks exhibit 

 several foldings; and extensive denudation is indicated by the isolated 

 patches of quartzite on several hills. There is evidence in Acworth and 

 Charlestown of conspicuous faults, insomuch that any present theory of 

 structure must be received with large allowance. Starting from the east 

 border of the mica schist, near the village of Acworth, there is a strongly 

 marked anticlinal. On the hill by J. Grant's (p. 416) the quartzite is said 

 to lie horizontally. The southern extension of the range at Z. Slader's 

 acts like a shallow synclinal. At Prospect hill in Charlestown is a high 

 south-east dip; vertical strata on the high land between Page and Oak 

 hills, so that a synclinal is needed to connect the Prospect with the Ac- 

 worth schists; four axes before coming to the Oak Hill quartzite range, 

 near Charlestown village; and an inverted synclinal in Calciferous mica 

 schist west of the quartzite range. One can hardly help suspecting the 

 recent age of this quartzite from the descriptions given of them in Chap- 

 ter IV. They are repeated in Skitchawaug mountain, in Springfield, Vt., 

 making a distinct synclinal axis (p. 412). There is now a new matter of 

 interest on the Vermont side of the river, since a band of Huronian two 

 miles wide has made its appearance in nearly vertical strata. West of 

 it is the continuation of the Calciferous mica schist group, probably in 

 synclinal attitude, and beyond is the ancient gneiss of Chester, whose 



