GEOLOGY O-^ THE MERRIMACK DISTRICT, 537 



be regarded as the first ledge of the Lake gneiss. It is near a saw-mill, 

 and dips south-east. The next known ledge is at J. Heath's, in the north- 

 west corner of Dunbarton, the north-west part of Bow being concealed 

 by river deposits. The rock is white and slaty, dipping from 55°-6o° N. 

 55°-8o° W., opposite to the other position. There are several of these 

 ledges between Paige's corner, or North Dunbarton, and Dunbarton cen- 

 tre. At H. Jameson's, not far from the west line of the town, opposite 

 East Weare, and on the brow of the hill, the gneiss dips 50° N. 60° W. 

 At a school-house nearly a mile east, on another road, the dip is essentially 

 the same, or ten degrees less. An abundance of drift covers the ledge at 

 the village, and a mile and a half to the south the Montalban rocks suc- 

 ceed. A narrow strip of territory in the east part of Weare is included 

 in this part of the gneiss. The porphyritic gneiss has the shape of a 

 wedge, and makes, as it were, a notch in the edge of the granitic variety, 

 another spur running out from East to North Weare. On the south side 

 of the North Branch, at East Weare, the gneiss dips 20° W. Other ledges 

 occur farther south, and notice has already been taken of the gentle north- 

 west dip of this rock a mile north-east of the village. The western edge of 

 this spur comes within a mile of Clinton Grove. The same rocks occur 

 in several places at the north base of Mt. William, in following the road 

 around to East Weare. Mts. William and Wallingford are composed of 

 mica schist, which take another piece out of this Lake area, only this is by 

 covering the other formation instead of eliminating it, as was the case 

 before. The south part of Weare shows the Lake gneiss as characteris- 

 tially as its typical locality on Winnipiseogee. Two miles south of Mt. Wil- 

 liam pond, by H. S. Hoyt's, the gneiss dips 80° N. 20° W. Next the por- 

 phyritic range in the south-east corner of the town the dip is 45° N. 50° 

 W. The most western outcrop is about a mile and a half south-east of 

 M. A. Hodgdon's, at the east base of Mt. Misery and Odiorne hill. Other 

 outcrops are near J. G. Dearborn's and at the village of South Weare, by 

 a school-house. West of A. H. Buxton's and a school-house the dip is 

 80° N. W. Near J. Sargent's the dip is 70° N. 80° W. At A. W. Cilley's, 

 near the south line, is the most western ledge noted, dipping northerly 

 and north-west. At the town farm the dip is 50° N. W. In New Boston 

 there is a fine exposure at G. Cram's. This formation does not occupy 

 quite the whole of the township of New Boston to the north-west of the 

 VOL. II. 68 



