528 STRATIGRAPHICAL GEOLOGY. 



tions of the position recorded. On the main Schodac branch, where it 

 crosses the Warner Hne, is a smaller area, about a mile long. It is bound- 

 ed on both sides by ferruginous schists. Near Davisville is a third area, 

 considerably smaller than the last, having an andalusite schist joining it 

 on the west. All these areas are isolated from all connection with each 

 other, or with the longer range to the east in the Blackwater valley. 

 The smaller areas have a north-east course, the larger runs east of north, 

 and all of them differ in direction from the Blackwater range, which 

 courses a little west of north. They are separated by the Lake gneiss. 



This Blackwater range begins near Webster post-office, and runs east 

 of south, crossing the river in a band by a saw-mill and other buildings 

 midway between the post-office and the south town line. It then con- 

 tinues in a high narrow ridge to the north part of Hopkinton, a distance 

 of four miles, where it is covered up by the sand of the three converging 

 rivers, — the Blackwater, Warner, and Contoocook. 



This range is discernible in Hopkinton. It first crops out on the hill 

 south of Tyler's station, on the C. & C. Railroad, with the dip 70° N. ds'' 

 E. There may be some veins of it cutting the adjacent ferruginous rock. 

 Next is an outcrop of limited dimensions, a short distance north-westerly 

 from the village of Hopkinton. These ranges point to the north end of 

 the Weare area, in the south part of the town. Near J. & J., and E. G. 

 Quimby's, we have porphyritic and common gneiss and mica schist, dip- 

 ping 32° N. 85° W., with six feet width of white quartz. There are sev- 

 eral exposures of porphyritic gneiss along the east and west road and the 

 north part of Weare. South of J. Edmunds's the base rock holding the 

 crystals is a clear, dark-colored, fine-grained mass. On two west roads 

 farther south are other exposures. Near East Weare this rock dips 20° 

 west. In the western part of this area, by D. D. Rowe's and S. S. Clark's, 

 the dip is 20° S. 48° W. A little nearer North Weare it dips more west- 

 erly, and is succeeded by an overlying granitic gneiss with a small dip. 

 This area is three and a half miles in its greatest diameter, and nearly as 

 wide. The dips are all in the same general westerly direction, so that it 

 must be an inverted anticlinal in its structure. A comparison of the 

 trends of outcrops tends to the theory that the Greenfield spur from the 

 main range may be continued in the North Weare, Hopkinton, and Web- 

 ster areas. 



