424 



STRATIGRAPHICAL GEOLOGY. 



Near L. Fairbanks's, S. io° E. 80°. 

 Near J. Gregg's, S. 50°. 



La/igdoa. 

 At J. Bairs, S. 80° E. 50°. 

 Near E. Baldwin's, N. 62° W. 3°. 



Acwortk. 

 50 rods west of T. Duncan's, S. 80° E. 



53°. 

 i mile south of Z. Slader's, N. 40° W. 64° 



and variable. 



IValpolc. 

 At J. W. Hayward's, N. 50° E. 20°. 

 At S. W. Griffin's, N. 20° W. 25°. 

 Near Griffin's, north, E. 58°. 

 Near forks of road noith of Griffin's, N. 



80° E. 24°. 

 60 rods south-west of A. P. Nichols's the 



strike is N. 68° W. — dip variable. 



The rock has a tendency to split in- 

 to longitudinal fragments. 

 South of Sugar brook, near E. A. Marsh's, 



N. 8° W. 8°. 

 South of Westmoreland station, strata very 



much contorted. 



Mica 



h mile north-east of the station, N. 1 1° W. 

 20°. 



i mile east of Mrs. James Ware's, strata 

 wrinkled, but dip westerly. 

 Chesterfield. 



At C. F. Daniels's, 5. 50° E. 30°. 



At C. N. Clark's, S. 50° W. 13°. 



At Chesterfield village, S. 60° W. 10°. 



At S. Waldo's, S. 30° E. 10°. 



Near J. C. Hubbard's, strike N. 10° W. ; 

 dip both east and west. 



Near J. Cobleigh's, S. 45° E. 55°. 



At J. B. Rich's, much contorted, and some- 

 times bent at right angles to the gen- 

 eral strike. 



At Brattleboro' bridge, N. 70° W. 75°. 



On Wantastiquit mountain, N. 40° E. 20°. 

 Hinsdale. 



On Bear hill, south side, vertical, or near- 

 ly so, dipping easterly. 

 Winchester. 



Near C. Lyman's, N. 40° W. 42°. 



Sen 



The mica schist of this area is characterized by having its strata, as a 

 whole, more nearly horizontal than any of the other rocks. It is often 

 swollen into gentle anticlinal curves, and has corresponding synclinal 

 depressions ; but sometimes, where it comes in contact with other rocks, 

 the strata are highly inclined. It rests unconformably, both on the 

 quartzite and the gneiss, at least on the protogene gneiss. In a following 

 chapter on the gneissic area of the Merrimack topographical district, 

 there are several sections across the gneiss, the quartzite, and the schist. 

 The mica schist has generally a thin, laminated structure ; it often con- 

 tains staurolite crystals ; cyanite is sometimes found in it, but graphite 

 seems to be limited to the rocks of the preceding groups. Mica schist is 

 more extensively developed in the southern part of the Connecticut valley 

 topographical district than either of the other kind of rocks. It forms a 

 narrow band in the central part of Newport ; but where it enters Unity 



