GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 42 1 



AFeivport. General strike on top of ledges, N. 11° 



East side of Blueberry ledge, S. 82° E. 50.° W. ; dip easterly. 



The dips of the quartzitcs of Unity and Acworth have been given on 

 page 416. 



Cilsiun. Surry. 



Near the Fish place, S. 38° E. 20°, and North of the Austin place, S. 53° E. 40°. 



variable. Keeiie. 



At M. F. Wilcox's, N. 82° E. 15°. On West mountain, S. 36° E. 50°. 



Argillaceous axd xVrgillaceous Mica Schists. 



There are very few purely argillaceous schists in this area, and those 

 that arc found are exceeding variable in texture. In Charlestown the 

 rock is thick-bedded, and is very little broken by joints and cleavage 

 places. In many places it contains staurolite in tessellated crystals like 

 chiastolite. In Westmoreland the rock is decidedly micaceous, and then 

 further south along the Connecticut, opposite Brattleboro', it differs very 

 little from ordinary clay slate. 



From North Charlestown the argillaceous schist extends east to the 

 top of Fifield hill in Unity; thence it extends southward through the 

 central part of Charlestown into Langdon, until it is cut off or crowded 

 out by the gneiss. Along the eastern border of this area the strata are 

 frequently nearly vertical and sometimes contorted, as at Wm. Smith's, 

 Both on the east and west, in the vicinity of the quartz conglomerate, 

 the strata are often bent, and generally stand at a high angle. At the 

 height of land on the road from Charlestown to Langdon, the strata are 

 at right angles to the quartzite. But as on the road near Ashbel Ham- 

 lin's, where there is neither quartzite nor quartz conglomerate near, the 

 strata are nearly horizontal. On the southern border of the CharlestoAvn 

 area, at L. Fairbanks's, we find the strata again almost vertical. With 

 the quartzite in the west of Acworth, there is a band of argillaceous mica 

 schist that has very much the same relation to quartzite as this in Charles- 

 town, It extends from Z. Slader's south, and is found with the quartzite 

 at T, Duncan's, where the strata are vertical. We have here a repeti- 

 tion of the schist and quartzite of Charlestown, 



The area of argillaceous schist in Walpole is quite limited, and lies 

 between Drew mountain and Walpole village. There is, however, an 



