4l6 STRATIGRAPHICAL GEOLOGY. 



sively developed on the mountains southward. South of the Brattleboro' 

 bridge the quartzite is just opposite E. S. Horton's, and on the side of 

 the mountain north it has been quarried; the stratification and jointed 

 structure of the rock enable the workmen to break it into fragments suit- 

 able for building-stones. It is quite probable that the strata are here in- 

 verted. A more extended notice of this quartzite, in its extension to the 

 south, will be found elsewhere. 



The dip of the quartzite is as follows : 



Charlestown. At T. Duncan's, S. 75° E. 58°. 



At H. Hall's, S. 75° E. 35°. South-east of N. Hayward's, N. 60° W. 

 On Sam's hill, N. 40° W. 40°. 20°. 



On hill east of Charlestown village, N. 80° At Wm. Putnam's, S. and S. 10° W. 28°. 



E. 15°. At Z. Slader's, N. 22° and N. 50° E. 24°. 



North of Hull's, Jr., N. 30° W. 18°. Near L. R. Hardy's, probably north. 



On Rattlesnake hill, 38° W. 40° to 70° N. At T. & J. F. Murdough's, N. 20° W. 25°. 

 On Skitchawaug mountain, east side, N. Cheste7-field. 



7o° E. 76°. North of Wm. Bennett's, S. 80° W. 30°. 



Unity. . East of Factoryville, S. 10° E. 15°, and S. 



At P. Smith, S. 50° E. 20°. 10° W. 62°. 



West of H. Smith's, S. 80° E. 20°. West of Lake house, N. 80° W. 35°. 



At cemetery west of Unity Centre, N. 80° On mountain north-west of H. Streeter's, 



E. 25°. S. 70° E. 50°. 



Near Mrs. McClure's, S. 30° E. 38°. Westmoreland. 



Acivorth. At Westmoreland village, vertical. 



At J. H. Howe's, S. 30° E. 12°. Near Mrs. Carlisle's, N. 40° W. 25°. 



At K. Smith's, S. 50° E. 20°. At A. B. Cole's, vertical. 



At J. Grant's, jjrobably horizontal. At J. Cowdrey's, N. 70° W. 20°. 



Quartzite on the Border of the Gneissic Rock of the Merri- 

 mack Valley District. 



The band of quartzite that is so persistent along the eastern border of 

 the Coos rocks of the Connecticut valley, and is sometimes found in 

 irregular, detached areas associated with the gneiss, has its most north- 

 ern outcrop in Landaff. It is usually a compact, fine-grained, and dis- 

 tinctly granular rock, very hard, often brittle, and is frequently, especially 

 to the southward, divided by numerous joints, which cause it to split into 

 fragments more or less rhomboidal. The typical varieties, when exam- 

 ined by a lens, seem to be made of grains of quartz imbedded in a sili- 

 ceous cement ; but they are found to pass, on the one hand, through a 



