512 STRATIGRAPHICAL GEOLOGY. 



clase and oligoclase feldspar, and has both black and white mica. The 

 rock here appears to be stratified, on account of the seams of mica that 

 run straight through it at an inclination easterly of sixty degrees. 



But there are places here, as elsewhere in granite, that the mica 

 occurs in patches about in the rock quite irregular, and more often bent 

 than in straight lines. Sometimes it even occurs in nodular masses, so 

 these lines of mica cannot be regarded with any degree of certainty as 

 lying in the plane of bedding. A quarry in this rock is one of the oldest 

 in this part of the state. A rock that withstands the weather and retains 

 its freshness after years of exposure develops qualities that give it the 

 highest recommendation as a building stone. That this rock has these 

 qualities is shown in some of the county buildings in Keene. 



In Troy the granite is largely covered by drift, but there are several 

 places where it appears on the east and south-east of the village. The 

 rock is fine in texture, and is a very desirable stone. The rock on the 

 west is the schist of the Montalban series. Towards Monadnock there 

 is a dark granite, and on Gap mountain it is associated with andalusite 

 schists. 



Southward, in Fitzwilliam, there is quite an extended area of granite. 

 The northern outcrop is at the Fitzwilliam Granite Company's quarry, 

 about three quarters of a mile north of the village. At the principal 

 opening the rock is of a coarser texture than that found elsewhere, but 

 for some purposes it is a superior stone. Just north of this, on the east 

 side of the road, there is a very fine-grained rock, and this is in contact 

 with andalusite schist. The most important outcrops of granite are on 

 or near the railroad. It extends up the road about eighty rods above 

 Angier's sheds, and, where it comes in contact with the schist, is one of the 

 most interesting points for study. Below the Richmond road the railroad 

 cuts the granite, and then south of the road we have extensive quarries 

 which produce some of the best granite that we have. The immense 

 blocks that are raised here show that the joints are not so frequent as 

 in most of our quarries. The fresh, brilliant colors of the mineral con- 

 stituents of this rock make it exceedingly desirable as a building or as 

 an ornamental stone. On the hill south of the railroad station, and on 

 its northern slope, is one of the oldest quarries in Fitzwilliam. The rock 

 is cut by numerous joints, the planes of which correspond very nearly 



