388 STRATIGRAPHICAL GEOLOGY. 



From the vicinity of the pond is seen an abundance of slate ledges on 

 the west slope of Bear hill, apparently dipping north-westerly. South of 

 Bliss pond we find the beginning of the more argillaceous band, dipping 

 80° N. 50° W. From Fairfield brook the land rises gradually but consid- 

 erably to Hanover Centre, and consequently afforded an excellent lodging 

 place for the drift. Hence it is rare to see any ledges near the town line. 

 West of I. F. Clark's, a mile and a half from Bliss pond, the slate dips 

 85° N. W. The green schists, referred to above, replace the slates before 

 we reach the place where the stream crosses the town line. A short dis- 

 tance west occurs the quartzite; then the schists at S. Hewe's, which 

 continue westerly until concealed by the alluvium. On the west side we 

 find chiefly Huronian rocks, with a supposed outcrop of hornblende, and, 

 possibly, mica schists on Oak hill, by the south line of Thetford. The 

 Huronian has the anticlinal in it at Union Village, and an overturn east- 

 erly dip of the slates on the west side of it. 



Fig. 56 contains a section from Moose mountain to Connecticut river, 

 near Pompanoosuc station. At the east end is a porphyritic gneiss, sup- 

 posed to be a lower member of the Bethlehem group, with a north-west- 

 erly dip. The Moose Mountain ridge is entirely of the Coos quartzite 

 dipping 50° N. W. on the section, though usually the angle is greater. 

 The schists of the Coos group adjacent hold the same position, as do the 

 clay slates along their eastern border. Hornblende schists are interstrati- 

 fied with these slates. Boulders of siliceous limestone are plenty at the 

 west base of the mountain. On the main road to Lyme from Hanover 

 Centre the slates dip very high N. 60° W., and at their west border are 

 fairly vertical, with the same strike. Woodward's hill, though mainly of 

 drift, shows ferruginous schists. Lower down, we find the western range 

 of quartzite, with its north-westerly dips, and, last of all, the mica schists 

 overlying them. 



Fig. 57 is designed to illustrate the Bethlehem group. Fig. 58 shows 

 the rocks along the route of Section VI in Hanover. The Bethlehem 

 gneisses, with a dip of 75° W., are followed by the quartzite similarly 

 disposed. The Coos mica schist range occupies the steep west slope of 

 Moose mountain, with a breadth not exceeding half a mile, conforming 

 essentially with the quartzite, and both perhaps constituting a ridge be- 

 neath the slates succeeding. It is not certain that the Coos schists recur 



