GEOLOGY OF THE MERRIMACK DISTRICT. 583 



is the mica slate range coming across from the north side of Beaver pond, 

 dipping 70° N. 30° W. At the west town line they stand about vertical'. 

 The dip of 85° N. W. extends about half a mile into Londonderry. At 

 the cross-roads east of L. Welch's the first south-east dip is found. The 

 rock stands vertical at A. P. tiardy's and at the school-house. The dip is 

 south-east a mile north, at the Pinkerton cemetery. It is vertical at S. 

 Bancroft's. At the forks in the road by P. Crowcll's, a few layers of the 

 feldspathic sandstones begin to show themselves in the schists, dipping 

 high south-east. Between Crowell's and N. Chase's, hard blue schists 

 prevail. Along the Mammoth road east, back of J. Royce's, the white 

 ledges are very conspicuous. At D. Goodwin's an ancient appearing 

 mica schist dips 80° N. 60° W., also at N. Boye's. At F. Coming's the 

 rock dips south-east, and at the cemetery near by the schist is somewhat 

 ferruginous. This is the last ledge seen on the line of the section, and is 

 a mile and a half east from the Litchfield line. The river sand now con- 

 ceals everything to the river. This gives us the main synclinal and two 

 subordinate axes along this route, and the feldspathic beds near the bor- 

 ders as before. 



A few other facts in Londonderry are these. On the Mammoth road 

 the feldspathic beds begin just north of the railroad crossing. A little 

 south are the mica schists, which may be followed north-east to cross the 

 railroad again by Wilson's station, and appearing on Fig. 100, south from 

 the quartz band, a distance of four miles. Next is a feldspathic band 

 beginning south-west, to the south of Cyrus Nesmith's, dipping S. 45° E., 

 appearing east of the Mammoth road, north of J. Brickett's, and so on to 

 its place on Fig. 100. The next schist band is seen about a Baptist 

 church, and farther south-west, north of J. Dickey's, and so on towards 

 Scabies pond. There is a still more prominent feldspathic band adjoin- 

 ing this, — from L Kimball's, in the west part of the town, to the east of 

 the Mammoth road, by J. Royce's, and at Moore & Perkins's. Almost all 

 these outcrops dip south-east. To the south of this last named white 

 band are no feldspathic layers of any account on the north side of the 

 synclinal line. Numerous quartz boulders near A. Smith's, east of I. 

 Kimball's, suggest the near occurrence of the ledge. Drift is more abun- 

 dant in the middle of the town, but there are north-westerly dipping out- 

 crops at the town-house and a mile west. There are other ledo-es of 



