422 STRATIGRAPHICAL GEOLOGY. 



argillaceous mica schist that outcrops in the southern part of the town, 

 west of the Christian church, and extends into Westmoreland. There is 

 also an outcrop below the railroad station, and also at school-house No, 9. 

 Southward in Westminster, along the river at H. P. Farr's, there is an 

 argillaceous mica schist, containing staurolite that undoubtedly belongs 

 with these Coos schists. 



The principal rock of the Mount Gilboa area in Westmoreland is an 

 argillaceous mica schist, but the hill south-east of the railroad station is 

 eruptive granite. Immediately north of this the dip of the rock is exceed- 

 ingly variable, and continues so until we reach the top of the ridge ; the 

 rock here is ferruginous, and dips N. 23° to 30°. Following the ridge, 

 which runs north-east, the rock is quite free from iron, and carries stau- 

 rolite in abundance, and there is very little change in dip. Following 

 the railroad south from the station, after passing the granite, we find in 

 the first cut an excellent place to study the argillaceous schist. At the 

 north end, on the east side, the strata appear to be vertical, but suddenly 

 they become horizontal, and they continue so, with occasional folds and 

 bendings, to the end of the cut. The rock becomes more micaceous to 

 the south, and at the Hill Village it is an argillaceous mica schist. East 

 of the church it is quite ferruginous ; it contains a quartz vein and a nar- 

 row band of eruptive granite. To the south-east, at Daniel Farr's, there 

 is another narrow band of eruptive granite; and this is succeeded by 

 hornblende schist. 



On the road south from school-house No. 9, the rock is a dark mica 

 schist. It is very much wrinkled, and has the general appearance of the 

 argillaceous schists. South, near the town line and close to S. Amidon's, 

 it is unconformable with a quartzite band that is on the west. In Ches- 

 terfield the distinction between these rocks and the mica schists is not 

 so marked as in the towns north, but still it is very noticeable even here. 

 The argillaceous mica schist occupies the central part of the town, to the 

 west and south-west of Spofford lake. It outcrops at Capt. C. N. Clark's, 

 C. F. Daniels's, and at many other places. We have given in Fig. 66 a 

 section that shows the argillaceous mica schist in a new relation, from 

 which it appears there has been an inversion of the rocks on the west, 

 bringing up in the axis the quartz schist, and causing the western band 

 of quartzite to rest on the schist. Southward, at the forks of the road 



