coos AND ESSEX DISTRICT. 47 



the rock is a calciferous mica schist. Directly north, at J. Poor's, the 

 hme, as an incrustation on the schist, is very abundant. Fragments of 

 quartz in the soil are also very abundant, and these sometimes contain 

 galena. Near M. Fletcher's the rock dips S. 56^ E. 62°. The character- 

 istic calciferous mica schist continues east nearly to M. Harriman's, 

 where it becomes somewhat arenaceous, and dips S. 51° E. 64°. At A. 

 Fletcher's, which is farther east and on the confines of the forest, we 

 find argillaceous bands, with argillaceous mica schist that dips N. 82° 

 E. 70°. This is near the eastern limit of the Coos group. South, at 

 J. M. Kidder's, the argillaceous schist resembles that east of Dead Water 

 in Clarksville ; here it dips S. 44° E. 80°. At J. Young's the rock is 

 argillaceous and fissile. The calciferous mica schist outcrops on the 

 road from Bear rock to South hill, and dips S. 46° E. 75°. 



Co 



LEBROOK. 



The principal rock of the town is calciferous mica schist. On the 

 road up Beaver brook, near J. E. Stevens's, the dip is S. 54° E. 60°. At 

 the Falls there is a band of siliceous limestone. At D. Heath's there 

 are numerous outcrops of calciferous mica schist. North-east of Factory 

 Village the calciferous mica schist dips S. 50° E. 78°. 



HuRONiAN Group. 



East of the line limiting the Coos group, in the northern part of the 

 state, there are two prominent bands of rocks that belong to the Huro- 

 nian. The first is confined chiefly to this section, and consists of strati- 

 fied diorites, diabase, hornblende rocks, greenish schists, containing 

 nodules of epidote, arenaceous and chloritic schists. This band of rocks 

 begins, on the south, in Columbia, and extends northward until it passes 

 out of the state near Third lake. Where this group of rocks begins in 

 Columbia the green schists predominate, but in Colebrook, just west of 

 H. Gould's, the diorite begins, and northward it is accompanied either by 

 the green or the arenaceous schists. The most prominent rock of this 

 group is the diorite. In many places it appears to be a massive rock, 

 without any marks of stratification, but elsewhere it is plainly stratified, 

 and interstratified with it is a whetstone grit or arenaceous sandstone 

 schist. It forms the ridge in Colebrook known as Bear rock. In Stew- 



