552 STRATIGRAPHICAL GEOLOGY. 



have become ferruginous. The next ledge seen near the state Hne is 

 near W. Frissell's, in the south-east corner of this town, seeming to dip 

 only 5° N. E. This may be a part of the more eastern range. 



The strip of gneiss on the east side of the mica schist is very narrow in 

 Bedford, but widens out in Amherst. On the map it seems to make one con- 

 nected mass with the more eastern range, but the presence of the quartz 

 furnishes us with a fixed stratigraphical boundary. There is little to note 

 of this rock before coming to Amherst, save where it is crossed by the 

 section in Fig. 89. The gneiss in the north part of the town dips north- 

 west. There is a good exposure by S. Austin's, near the Mont Vernon 

 line, and at J. Mark's, close by Williams pond, dipping 50° N. W. About 

 a mile north of Amherst village is a new quarry of granite, or of granitic 

 gneiss, which clearly belongs to the Lake series. The direct road from 

 the village to Mont Vernon is mostly over a plain, and drift, after begin- 

 ning to climb the hill. At W. Richardson's, a little way into Mont Ver- 

 non, the gneiss is well-defined, and dips N. 25° W. To the south, in 

 Amherst, at W. Pratt's, the same rock dips 20° N, W. At L. Elliott's is 

 a limited outlier of coarse mica schist standing vertical, with the strike 

 N. 75° W. This strike also shows itself at T. Patch's, about a mile west 

 of the village. The north part of Milford is supposed to be occupied with 

 the granite that is quarried so extensively farther south. At the south- 

 east corner of Lyndeborough this gneiss appears, and it is near the east 

 line of the mica schist group. Figs. 90 and 91 show the occurrence of 

 this rock in the east part of Wilton. Similar ledges of gneiss occur in 

 the south-east part of Wilton, and the north-east part of Mason as far as 

 the quartz extends. There is a granite at Elliott's mill in Mason, which 

 is the last of the rocks to be described in connection with the quartz. 

 The gneisses and granites farther west properly belong to the next range. 



A review of all the positions of the gneiss noted between the mica 

 schist and the Manchester range of quartz shows a uniform pitch towards 

 the north-west, varying to north. The last may possibly belong to the 

 next range, which had been crowded — at Amherst village — to the south- 

 east, and passes nearly due west, directly to join the north end of the 

 western quartz band. More light is required for the satisfactory un- 

 derstanding of the break in the quartz. Perhaps the difficulty may 

 be removed by disregarding the quartz outcrop near Amherst village 



