GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 4 II 



are wavelite and prehnite. At Drewsville, in the river above the bridge, 

 there are small but very fine crystals of prehnite in narrow veins in the 

 gneiss. The following figures show the dip of the gneiss to be exceed- 

 ingly variable: East of J. Milliken's, Charlestown, S. 50° E. 64°; at E. 

 Osgood's, S. 36° W. 50°; at B. Sartwell's, E. 25°. On Porter hill, Lang- 

 don, S. 45° W. 30°. At grist-mill in Alstead (Paper Mill Village), S. 70° 

 W. 24°; below Paper Mill Village, N. 23° W. 24°; at J. Chandler's, N. 40° 

 E. 45°. In Drewsville, N. 30° E. — variable; in Walpole, at the mouth of 

 Mountain brook, N. 12° E. 38°; at Cold River bridge, N, 35°; between 

 Cold River Bridge and Bellows Falls, E. 35° to 60°; at Bellows Falls, by 

 railroad bridge, N. 50° W. 62°. 



3. HuRONiAN Rocks. 



These rocks, if they appear in this area, are very limited in extent. 

 In Vermont, however, opposite Charlestown, we find a few that undoubt- 

 edly belong to this group. They begin on the west side of Skitchawaug 

 mountain, and south of the Black river they probably extend to the Con- 

 necticut, and form a narrow band along the river to a point just south of 

 Saxton's river. The band probably turns to the east and extends around 

 the Montalban gneiss, since there is a limited outcrop in Walpole on the 

 railroad some eighty rods south of Cold River bridge. The first outcrop 

 west of the Cheshire bridge is a greenish chloritic schist, with the strata 

 nearly vertical; but south in Rockingham we also have dark siliceous 

 schists, and these are the prevailing rocks immediately west of Bellows 

 Falls. In the north-east corner of Westminster, on Saxton's river where 

 there were formerly some mills, the rocks are probably Huronian. On 

 the hill half a mile south-east of this we have hard siliceous schists, and 

 with these there is a peculiar breccia. This is probably near the south- 

 ern limit of the Huronian rocks in this section of Vermont, 



Nearly opposite this point in Walpole we have a dark siliceous schist, 

 with a northerly dip ; but where the rock is cut by the railroad south of 

 Cold River bridge we have a distinct conglomerate. These rocks are 

 very limited, and are the only ones that we have referred to the Huro- 

 nian. 



