GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 359 



above the bridge the dip is south-east. The rock bears some resem- 

 blance to that in Stark. East of D. Randall's a fine-grained mica schist, 

 resembling hornblende when water worn, succeeds, dipping 70° W. This 

 may belong to the Coos group. In Newbury this greenstone range occu- 

 pies the ox-bow north of the village. At its northern end the ledges are 

 prominently exposed, large bosses extending to the water's edge, which, 

 by their superior hardness, have turned the course of the Connecticut. 

 They dip 75° N. 70° W. The mineral spring near the village comes 

 from these schists. The valley of Hall's brook in central Newbury is 

 underlaid by these greenstones. On the water-shed between this and 

 Wells River, I found large boulders of serpentine, which probably came 

 from a ledge not far off. The range is broadest about the middle of the 

 town. It appears on the east side of Ticklenaked pond in Ryegate, dip- 

 ping 80° N. 80° W., but disappears entirely after reaching the Bradford 

 line, that last seen having an easterly dip. In Piermont a few ledges 

 appear in the north-west part of the town, next the Connecticut river. 



An important range of protogene commences in a large hill north of 

 Piermont village, crosses the river at a great bend, rises first into the 

 isolated Shaw's mountain, and then into Sawyer's and Morey's moun- 

 tains, terminating with them in Fairlee. East of Piermont hill the pro- 

 togene and mica schists are separated by a fault about N. 25° E. The 

 protogene dips east of south, and the mica schists west of south. Near 

 Gully brook, west of Mrs. E. Bixby's, there is an anticlinal, the dips being 

 75° N. 30° W. and 70° S. 35° E. On the Vermont side the strata are 

 usually about vertical. The mountains named have inaccessible preci- 

 pices on their eastern sides, with debris at their bases, and, as seen from 

 Orford village, are very conspicuous. One of them was colored as gran- 

 ite in the geological map of Vermont. The same error occurred there in 

 the delineation of the similar rock in Northumberland and Lancaster; 

 and in a statement descriptive of Section X the diabase of Littleton was 

 called porphyritic granite. The error is an easy one to make on a super- 

 ficial examination. Without a very thorough study of the relations of 

 the protogene to the other Huronian members, I have thought it to 

 occupy a high place in the Lisbon group below the interesting quartz 

 bosses of Lyman. It does not occur in the valley, as I remember, above 

 Claremont and south of Vershire. 



