GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 357 



After passing the green rocks the argillitic schist succeeds in great 

 profusion, beginning at a steam mill and extending to Boltonville. It is 

 soft, occurs in thin, slaty layers, and is in this respect different from the 

 more common variety as seen in Lyman. It weathers white, staining 

 the rock an inch deep. When fresh there are two shades of green, a 

 bluish and a drab. Thin layers of a darker variety, and hard, green sand- 

 stones, are interstratified. The first strikes are almost east and west ; 

 near the railroad bridge over the river the strike is N. 20 E., dipping N. 

 70° W. at a very high angle. After reaching the railroad flag station the 

 ledges are mostly concealed by sand. Half a mile before reaching Bol- 

 tonville there is a greater proportion of the hard, green schists. Those 

 by A. Sly's house dip 55° north-west, while at Boltonville dam they dip 

 85°. The formation probably extends a mile farther up the river, but 

 everything is concealed. Farther south in Newbury, down nearly the 

 whole valley of Hall's brook, the Lisbon schists predominate, so that 

 ground is afforded for believing the lower group comes up west of Bol- 

 tonville. 



The county map represents a conspicuous range of hills from Wells 

 River village to Mt. Pulaski, below Newbury village. This seems to be 

 mainly composed of the argillitic strata, which continue into Bradford. 

 At the railroad cut below Wells river they dip 70° N. 55° W., and are 

 finely exposed. Further on they dip 75° N. 65° W. They are the same 

 by C. J. Scott's, or where the railroad nearly touches the river. In the 

 south part of Newbury village, where crossed by Section VIII, there is 

 an anticlinal, as if the lower rock came very near to the surface. At the 

 railroad cut south of Newbury station, close to the Connecticut, the dip 

 is 85° south-easterly. Where the road turns to cross the bridge, the dip 

 is 75° S. 80° E. The position is exactly the same thirty rods west, while 

 on the continuation of the Pulaski schists the dip is 85° N. 80° W.; and 

 this rock does not extend more than a mile to the west. There are sev- 

 eral ledges of this rock near South Newbury station. All the Huronian 

 seen in Bradford belongs to this division. It is prominently exposed by 

 road cuttings opposite the "Ledge," dipping 70° east. The road from J. 

 Clark's, back of the "Ledge" down to the fair-ground, runs over Cam- 

 brian slates, showing that the Lyman slates pass southerly under the_ 

 sand ; but there is a repetition of the latter upon the hill back of Brad- 



