358 STRATIGRAPHICAL GEOLOGY. 



ford village, whose presence can be explained only by the action of eleva- 

 tion with faults. It runs from the hill at least to the bridge over Wait's 

 river south-west from the village. At the bridge over this river in the 

 village the rock is Cambrian. In the south-east part of Bradford we find 

 a range of the same rock from a school-house near Piermont station to 

 the east side of the north end of Fairlee pond. It dips 85° easterly at 

 the school-house; 80° S. 60° E. opposite the turn of the Connecticut 

 easterly north of Shaw's mountain, and it may be the same by the lake. 

 This band has not been recognized as yet farther south. To the east 

 the protogene comes in, composing Shaw's, Sawyer's, and Morey's moun- 

 tains, crowding out the slates. Further observations will probably show 

 the existence of this member farther south, since it is only recently that 

 the Pulaski range has been separated from the lower group. 



Lisbo7i Group. Two divisions of this formation may be followed along 

 the Connecticut river, — first, hard greenstones of various shades of com- 

 position; second, protogene. The first are the prevailing varieties; the 

 latter occur occasionally. All that appears in Haverhill and Newbury, 

 so far as observed, is of this kind. Along the section (Fig. 45) very little 

 appears, and that in Wells River village and west of Boltonville. It may 

 exist beneath the sand of Woodsville, since it is known to crop out oppo- 

 site Howard's island. Along the section (Fig. 47) it is more abundant. 

 There is a conical hill near the north Newbury bridge, composed of dia- 

 bases resembling those that yield fossils. The dip is obscure, most prob- 

 ably easterly. The rocks have been much shattered by the action of 

 frost. Between the river and Wood's pond is a great development of 

 these ledges. They are so abundant that the land is mostly uncultivated. 

 By the Haverhill depot the hard schists dip 75° S. 35° E. Half a mile 

 north-easterly, on the road to the town-house, the dips are irregular and 

 westerly, making a synclinal axis. West of Wood's pond green mica- 

 ceous schists dip north. About half a mile north of the pond the schists 

 occur for the last time, with north-westerly dips. The ledges are con- 

 cealed by alluvium, and they are probably Bethlehem gneiss beyond D. 

 H. Hale's. 



At and above the bridge over Oliverian brook, by Haverhill Corner, 

 argillaceous quartzites appear, very much contorted. The best observa- 

 tion of the dip is to the cast 70°. Others dip north. A fourth of a mile 



