GEOLOGY OF THE MERRIMACK DISTRICT. 55 I 



mica schist at the looking-glass factory a mile south of the village. 

 Between Joe English hill and the south town line gneiss abounds and 

 is well defined. Its southern limit towards Roby hill is near the 

 south line, and near Joe English pond on the south-east. Between 

 the pond and hill the rock is not so clearly defined. At the base 

 of the hill are possible strata dipping only 30° N. W., containing 

 segregated veins. The south side of Joe English hill is a precipice. 

 Gneiss occurs by J. Cochran's, about three miles south-west from New 

 Boston village ; about Colby's pond, in the south-west corner of the town ; 

 and about the mills, in a small hamlet adjacent to the east. Nearly oppo- 

 site North Lyndeborough post-office, by I. Gage's, is the most western ex- 

 posure of the gneiss in this town. The north-west part of Mont Vernon is 

 made up of the same rock. By E. A. Green's the gneiss dips 30° S. 70° W. 

 The same rock appears at W. Odall's. The south end of Piscataquog 

 mountain, in Lyndeborough, has not been examined. On the west side of 

 Badger pond the rock is like the Concord granite, and is used extensively 

 in the neighborhood for underpinning. The dips about Lyndeborough 

 centre are high to the north-west. It has a similar character two miles 

 to the south-west, near S. Cummings's. A hard granitic gneiss occupies 

 the country in the valley of Stony brook for about two miles west of 

 South Lyndeborough. The range runs through the north-west part of 

 Wilton to Temple. The dip in Wilton is north-west. The New I^DSwich 

 rocks present difficulties just like those at Hooksett. It is very likely that 

 this Temple range crosses Barrett mountain near the state line, and also 

 follows the boundary to the east, so as to connect directly with the 

 Manchester range, and perhaps cause the mica schist deposit to termi- 

 nate near the village of New Ipswich. Our observations are so scanty 

 that it cannot be affirmed that the schists do not converge somewhat at 

 the village, and then extend into Massachusetts. The particular charac- 

 ter of the rocks and positions through Greenville and New Ipswich may 

 be best learned by referring to the description of Section I. In the south- 

 west part of the town I have collected gneiss by W. Young's, dipping 

 irregularly S. 60° W. On reaching the ridge of the hill a mile farther 

 north-east, the dip is much the same, greatly crumpled. Near J. Nut- 

 ting's, on the east side of the ridge, the dip is N. 35° E. There seems to 

 be an anticlinal in this rock on the ridge. At the chair shop the schists 



