coos AND ESSEX DISTRICT. 63 



breadth of half a mile; following this, though still siliceous, it has the 

 appearance of an argillaceous schist, and is very much wrinkled. This 

 is followed by hornblende schist. On the road, a quarter of a mile below 

 Johnson's, the wrinkled schist outcrops near the road, and contains stau- 

 rolite. The siliceous schist is exceedingly variable in its dip, but is away 

 from the granite. The wrinkled schist dips generally N. 60° W. 70°, and 

 the hornblende probably the same way. South, just below Stratford, at 

 B. Merriam's, the strike is east and west, and the dip is S. 80°. At the 

 head of Bog brook, both on the branch that comes from the Notch to- 

 wards Columbia, and the one from Sugar Loaf, there is a hard, dark 

 siliceous schist. At the south base of Sugar Loaf the dip is S. 70° E. 

 78°. On the road that runs south from Bog brook, from near the mouth 

 of East Branch, the rock is a gray siliceous schist ; near B. Brown's it 

 dips S. 50° E. 65°. A quarter of a mile south of the end of the road it 

 dips S. 70° E. 6S^. In the east part of the town, on Nash stream, there 

 is a similar schist, but it extends only a short distance north of Percy 

 I^eaks, and it dips generally S. 15° E. 65°. 



Northumberland and Stark. 



Extending around the south-west base of Percy peaks is a dark sili- 

 ceous schist, the dip of which is exceedingly variable. South of Potter's 

 pond a dark siliceous schist, that by weathering presents a peculiar pitted 

 surface, dips S. 20° E. 72°. On the east side of the Devil's Slide, and 

 also on the east side of Mill mountain, the siliceous schist stands vertical, 

 and is in contact with porphyrite, which forms the mass of these two 

 elevations. The same rocks are on a hill east of Groveton, and they have 

 the same relation. In the valley between Mt. Lyon and the Pilot moun- 

 tains we have the dark siliceous schist. At the east base of Mt. Lyon 

 the dip is S. 70° E. 72°; near the road the dip is N. 50° E. 70°. East of 

 the road the dip of the schist is N. 75° W. 80°, and it is penetrated by 

 the porphyrite. 



The rocks of the Connecticut valley, from the north part of Northum- 

 berland to Dalton, although having for the most part the same general 

 characteristics, yet they are exceedingly variable, and so cut by joints 

 that generally it is difficult to determine the dip. In general they may 

 be described as chloritic feldspathic schist. 



