35^ STRATIGRAPHICAL GEOLOGY. 



most constant ; the last is recognized only in Haverhill ; the second has 

 been separated from the first only recently, as I had supposed it did not 

 extend out of the gold district. Hence I may not be able to separate it 

 entirely from the first. I will describe the three divisions in the order 

 of convenience. 



Sivift Water Schists. These are properly a part of the preceding 

 field, extending no farther south than North Haverhill, and being the 

 extension of those exposed along the Wild Ammonoosuc river. There 

 are three prongs reaching into the gneissic area. Two have been spoken 

 of already, in the east part of the Bethlehem gneiss area. Rising from 

 the modified drift south-east from Woodsville we find a long, gently- 

 sloping hill, allowing the ledges to appear only on its summit, as about 

 F, D. Kimball's, the strata dipping 60° N. 60° W. The rock has this 

 strike in the ledges at Kimball's house, but on the north side of the road 

 the dip is more westerly. The rock is a micaceous, arenaceous schist. 

 Garnets are said to be abundant in this neighborhood. Following the 

 road into Bath, around the north side of the hill, the only ledges seen are 

 near A. Johnson's, — greenish arenaceous beds, — dipping 40° N. 80° W. 

 The strike of the rock would carry it to the village just south of How- 

 ard's island. On the most eastern extension of this group there are 

 hornblende and argillaceous schists, dipping north-westerly. Near D. 

 B. Blodgett's, on the town line, slates dip 40° E., with a large mass of 

 white quartz. 



Lyman Group. These strata are not abundant, save in the north part 

 of Newbury. They occupy most of the section line from Woodsville 

 across to Boltonville, Vt. (Fig. 45), and they stand upright at Woods- 

 ville. In Wells River village, ledges are abundant. There seems to be 

 a ridge of the lower division in the village, perhaps explaining the exist- 

 ence of the anticlinal. At the first cut in the Montpelier Railroad the 

 rock is greenish, with many nodular veins of quartz carrying chlorite, 

 ankerite, iron, and copper pyrites. There is, also, what seemed to me to 

 be a dyke, about two feet wide, of diabase. Others who have since ex- 

 amined the locality do not esteem it an injection. Opposite the railroad, 

 in the anticlinal portion, are layers of dolomite. All these rocks are sug- 

 gestive of the Lisbon group. If it is present, it is only in small amount, 

 since the argillitic layers predominate to the west and south. 



