486 STRATIGRAPHICAL GEOLOGY. 



village, at the Curtis mine, and as far south as Spofford lake, south-east 

 at E. Pierce's and Jas. Corastock's, south-west of Comstock's nearly to 

 Factoryville, and along the east side of Pistareen mountain, there are 

 many ledges. At the south end of the mountain the rock appears to be 

 intrusive, and is composed largely of feldspar. South of Spofford lake 

 there is a slaty gneiss, unlike anything found elsewhere, unless there is a 

 small area north of the Barker place in Westmoreland, and west of Mine 

 ledge in Surry. It is cut by numerous cleavage planes, and dips to the 

 south. Nowhere is the hornblende gneiss so persistent as in Westmore- 

 land, but it is associated with the mica schist rather than with the com- 

 mon gneiss, and quartzite is also found in many places. The succession 

 of the rocks here is as follows : Gneiss is everywhere the underlying 

 rock ; hornblende schist follows the gneiss, and mica schist the horn- 

 blende. At Westmoreland, however, as shown in Fig. y?>, there is a 

 quartzite or quartz between the gneiss and the hornblende schist. 



Between the area of gneiss in Surry and Westmoreland and that in 

 Swanzey, where gneiss occurs, it is of the protogene variety, and in Surry 

 and southward to the state line the gneiss is a well defined variety of the 

 Bethlehem gneiss. It appears on Mt, Caesar, in the Ashuelot mountains, 

 on the line of Swanzey and Winchester, on Attleboro' and Second moun- 

 tains in Richmond, and in the south-east part of Winchester. In the 

 north-east part of Swanzey the rocks are for the most part concealed by 

 drift. Going west from Marlborough depot into Swanzey, near A, T. 

 Lane's, is a gneiss that has some of the characteristics of the common va- 

 riety, and it contains a coarse granite vein that carries magnetite. Some 

 of the crystals are an inch in thickness. On Mt. Caesar the strata seem 

 to dip westerly io°, though generally the strata of this rock are nearly 

 vertical. North, at L. Dickenson's, the gneiss is more micaceous than 

 elsewhere ; and the dip is about the same as on Mt. Caesar. Northward, 

 to the town line, there is drift, generally a fine gravel. Southward, at 

 Unionville, there is gneiss ; and in the south-east corner of the town, and 

 in the edge of Troy, there is a granite composed largely of quartz. East 

 of Swanzey pond, near L. W. Darling's, there arc extensive outcrops of 

 gneiss ; and in the extreme south-west corner of the town, between Win- 

 chester and Richmond, the rock is altogether gneiss. On the north-west 

 side of Franklin mountain it has been quarried to some extent, and a 



