414 STRATIGRAPHICAL GEOLOGY. 



are several areas of singular shape. In the north-west corner there is an 

 extension southward of Perry mountain. Near J. Grant's it crosses the 

 road, and on the south it terminates in an abrupt hill, the strike pointing 

 down a deep valley towards the south-west. The most remarkable area 

 is at Z. Slader's, where it is circular in form ; and the strike conforms 

 to the shape of the hill as though there had been a doubling up of the 

 whole mass. The surrounding argillaceous rock also shows great dis- 

 turbance. 



On the road up Stebbins brook at the first there is an extensive out- 

 crop. It runs a little south of east, and appears on the road at T. Dun- 

 can's. Here it turns south, and can be traced for three fourths of a mile, 

 but it outcrops on Cold river in Langdon a quarter of a mile from the 

 line of Acworth. 



Charlestozvn. In the eastern part of Charlestown we have Sam's hill, 

 which, on the west, is largely a quartz conglomerate. It is an immense 

 triangular area, sending an arm north-westerly, which crosses the road 

 at the height of land near William Rupp's ; another arm goes south-east, 

 extends into Langdon, and outcrops near E. Baldwin's. The west point 

 of Sam's hill is a distinct conglomerate; but the arms north-east and 

 south-east are generally like the quartzites elsewhere. But in its exten- 

 sion northward, after it crosses the road near William Rupp's, where it 

 disappears beneath the argillaceous schist, it shows pebbles on the weath- 

 ered surface. 



Alstead, and southward. On the south-west extremity of Cobb's hill 

 there is a limited area of quartzite, in which the joints are not so marked 

 as elsewhere. In the west part of the town, a quarter of a mile south of 

 A. Alden's, there is another small area with well-marked joints. In Wal- 

 pole the quartzite can be seen in the central part of the town, on the 

 road from where the old church stood east to Fisher brook. On the road 

 that crosses Sugar brook, where it turns to the south, there is a quartz 

 conglomerate, and some of the pebbles are a foot in length. From the 

 general section, it will be seen that the quartzite is unconformable with 

 the mica schist, both on the east and west. In the south-east part of the 

 town, on a small stream a few rods north-west of Asa Gilbert's, we find 

 quite an extensive outcrop of quartzite; and this may be an outlier of 

 that which is so extensively developed in Westmoreland. Although there 



