572 STRATIGRAPIIICAL GEOLOGY. 



between the two localities, occupied by the later ferruginous group. It is 

 first seen in Concord, at Pine hill, on the west side of Penacook lake. One 

 would expect to see it on Jerry hill, farther south, but we cannot find any 

 trace of it there. It dips north-west, and comes up again by I. Rowell's, 

 at the north end of the lake. At the first railroad cut beyond West Con- 

 cord it is certainly fifty feet wide. It is then concealed by alluvium, and 

 comes to view magnificently upon Oak hill, on the east side of the Merri- 

 mack, extending into Loudon. It is more than two hundred feet wide. 

 Search for the range farther east has not developed any other exposures, 

 but our explorations have not been sufficiently exhaustive to cover all the 

 territory. From miners' reports it would seem as if it cropped out again 

 to the east of Loudon village. 



At the railroad bend two miles from West Concord are gneisses and 

 ferruginous layers dipping 65° N. W., and it looks like the still older Lake 

 gneiss with segregated veins a mile south of Horse hill. Near Sewall's 

 falls the gneiss with protrusive granite veins dips north-west. Hence 

 there is an anticlinal between, the falls and Blanchard's. On the Moun- 

 tain Farm hill the dip is north-west. At Snow pond it is the same. At 

 I. and J. Chase's, east of Hothole pond, Loudon, are coarse mica schists, 

 dipping north-west. The dip is south-east at the north end of Pleasant 

 street, and farther south the strike is nearly east and west. At J. C. 

 Eastman's and J. S. Ordway's the schists carry coarse granite beds with 

 north-west dips. At J. C. Sanborn's, on the continuation of Pleasant 

 street, west of Rollins pond, is a white gneiss, very much twisted, dipping 

 west. On the east side of Beauty pond, in the west corner of Barnstead, 

 there is considerable coarse Concord granite, and this is the most north- 

 eastern outcrop known in this Montalban area. The system is developed 

 farther to the north-east, in the coast district, after passing the overlying 

 mica schists of Barnstead and Alton. The ordinary coarse granites and 

 schists of this region crop out abundantly in the north corner of Pem- 

 broke and through Chichester, dipping north-west. On the west side of 

 the Merrimack they constitute most of the towns of Bow and Dunbarton, 

 being the natural continuation of the ledges in Pembroke and Chichester. 



On a trip from Hooksett to Hopkinton, through the middle of Bow, I 

 found gneiss and coarse granite dipping north-west for some ways past 

 Bow centre. The south-cast dip is first prominent in the south-west 



