GEOLOGY 07 THE MERRIMACK DISTRICT. 545 



schist, with a granite to correspond to it in texture. The dip of all these 

 rocks in this section is north-westerly. The western part of the quartz 

 seems to be somewhat calcareous. If the soil were cleared away, beds of 

 limestone might be found. 



On the south side of the river through Goffstown, on a line parallel 

 to the section about a mile distant, the correspondence is not perfect. 

 West of Goffstown the conditions do not allow comparison. To the 

 east we find close to the village a large mass of granite that has not 

 been observed in the mica schist across the river. Opposite the centre 

 village the band of gneiss is much broader. The granite on the south 

 side is less abundant, and disappears altogether before coming to the 

 south part of the town. The white gneiss of E. Merrill's is repeated at 

 C. and D. Wyman's. The place of the quartz near J. Black's is under- 

 neath the sand. There is an interesting assemblage of igneous boulders 

 by a watering-trough at the second fork in the roads east of the Centre 

 station. It is a sienitic conglomerate, mostly of mica schist fragments, 

 suffering much from weathering, which I have nowhere found in situ. 

 The pieces may be four and five inches long, consisting of gneiss, gran- 

 ite, mica schist, and quartzite. A careful search of the adjacent region 

 disclosed very large blocks of it at the bottom of the sand hills towards 

 the river, smaller pieces at E. Moore's, in Bedford, about three miles 

 south from the stream, and none on the north side. Our conclusion is, 

 that the ledge from which they were derived exists underneath the 

 meadow of the Piscataquog river, not far from the station and village. 

 On the road between the quartz at M. W. Woodbury's, at the Dunbar- 

 ton and Goffstown line, and the Merrimack, all the ledges are inverted, 

 as both ranges dip north-west. 



Fig. ?>d> shows the order and position of the rocks on a sectional line, 

 cutting both quartz bands, through the Uncanoonucs. It is assumed 

 that the quartz has the same position here as the strata on both sides, 

 namely, a dip to the north-west. Near the eleventh mile-post from Man- 

 chester, where the section crosses the Piscataquog river in New Boston, 

 gneiss with coarse granite veins dips 60° north of west. Granite is seen 

 at the west base of the Uncanoonucs, just by the west line of Goffstown. 

 Gneiss succeeds, dipping N. W., and is supposed to constitute the bulk of 

 the first of the twin mountains. Mica schist occupies the space between, 

 VOL. II. 69 



