384 STRATIGRAPHICAL GEOLOGY. 



within newer Coos rocks, with the same monodinal dip, would not be the 

 most unreasonable method of accounting for the presence of this rock, 

 which has heretofore been supposed to be confined to the older forma- 

 tions in New England. 



A visit to Strong's quarry in 1875 showed a greater thickness of soap- 

 stone than appeared at first; and many of the adjacent rocks seemed to 

 be charged with talc, so as to be genuine talcose schists. Passing to the 

 south-west, a mongrel rock occurs, covering the soapstone quarry univer- 

 sally, with the dip of N. 45° W. along the line of the quarry. This is fol- 

 lowed by a hornblende, dipping 65° N. 55° W. 



In Fig. 52 there is a section from Bass hill to the Connecticut, a mile 

 north of the south town line. The east side of the hill consists of the 

 granitic Bethlehem gneiss, which dips N. 55° W., probably 80°. At the 

 summit, or a little west of it, may be seen the meeting of the gneiss with 

 argillo-arenaceous schists, dipping 80° S. 50° E. This is an overturn, and 

 is not seen away from the hill-top. At the west base the dip is 75° W.; 

 and farther north mica schists, with alternating bands of quartzite, dip 

 70° N. 47° W. At the first bridge east of the Strong quarry, the dip is 

 58° N. 46° W. Then occur the dips at the quarry and farther south, 

 mentioned above. Near N. & T. M. Rugg's, the dip is 70° N. 60° W.; 

 west of the same, 6S° N. 50° W.; half a mile west, 50° N. 60° W.; at J. 

 C. Sanborn's, 65° N. 55° W.; near D. E. Tillotson's, 50° N. 80° W. These 

 are all argillaceous. A mile west of Tillotson's is mica schist dipping 48° 

 W.; the same, 50° N. 40° W. in contact with a mass of eruptive granite 

 from ten to fifty rods wide. Bands of mica schist follow, dipping 25°-35° 

 S. 30° W. Hornblende schist, with a north-westerly dip, succeeds, thirty 

 feet wide. Mica schist comes in again before reaching the alluvium, dip- 

 ping 65° N. 60° W. There is not much variation in the position along 

 this section line. 



Fig. 53 presents the strata from the North Thctford bridge to Davison 

 hill in the north part of Lyme. The Huronian of Lyman aspect occurs 

 at the bridge, with dolomite near by dipping 70° E. The same rock is 

 seen at C. F. Carr's, dipping 50° W. The ledges, a fourth of a mile north 

 of the road, particularly l)ack of M. D. Baxter's, seem to possess the same 

 inclination. Alluvium conceals the ledges for a mile along the road ; and 

 the first rock peering above it is hornblende schist, by J. Wise's, dipping 



