GEOLOGY OF THE MERRIMACK DISTRICT. 49I 



as far south as the village, the outcrop examined was a coarse granite. 

 In Sullivan, at Bear Den mountain on the west, and from near D. Sew- 

 ard's, at least as far as Moore's mill in Stoddard, the rocks resemble very 

 closely the White Mountain gneisses. Between these points the rocks 

 are generally highly siliceous and pyritiferous. Where the rocks are not 

 ferruginous, as east of D. Seward's, the strata are often twisted into nod- 

 ular-like masses. South-east of the church, on the road to East Sullivan, 

 near Weathron & Cordney's, there is a coarse granite vein containing 

 beryl. In Nelson the rocks are uniformly pyritiferous, except in the ex- 

 treme eastern part of the town. In the north-east part of the town, at 

 H. Wilson's, there is a bed included in the porphyritic gneiss. At A. 

 Robbins's we find nodular concretions in the schist, which is here graph- 

 itic, and contains bright almandine garnets. In the vicinity of the Sea- 

 bury graphite mine, the rocks are decidedly pyritiferous. Near the town 

 farm, where large quantities of graphite have been obtained, the rocks 

 are of the same character. At Page's, to the west, the cleavage is more 

 marked than elsewhere in the town. Near Noah W. Hardy's the rock is 

 generally the common pyritiferous schist, though there are bands that 

 resemble gneiss. 



In the entire eastern part of Roxbury we find that the rocks are ferru- 

 ginous, and probably extend as far west as G. Nims's, on the road from 

 the church to Keene. In the south part of the town they extend half a 

 mile west of the forks of the road south of Horse hill. West of these 

 rocks we have the White Mountain gneisses. In Roxbury, the ferrugi- 

 nous schist abounds in concretions. They are much more frequent than 

 in this rock elsewhere, and they lie in all directions, with regard to the 

 strata, sometimes directly across them. They are of various sizes and 

 shapes. One was seen three feet in length, and not more than three 

 inches in thickness. Usually they look like rounded pebbles, which some 

 have thought them to be; but a fragment, two feet in length and not 

 more than two inches in thickness, would hardly lie at right angles to 

 the stratification of the rock, or even diagonally across the strata. The 

 shape of some are peculiar, being thick at one end and tapering almost 

 to a point at the other. This shows, also, that they can hardly be peb- 

 bles or boulders. Near the church, at the centre of the town, and on the 

 south-west side of Horse hill, a person can have a fine opportunity for 



