GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 281 



crop between the Parker Hill and Gardner Mountain lines of north-east- 

 erly roads, connecting the larger areas in the south-west part of Littleton 

 and in the north part of Bath. The two parts are separated by a narrow 

 range of clay slate, which is replaced by the Lyman group in Waterford 

 and Concord, Vt. We remark that the Lisbon group occupies a greater 

 area in this field than in any other part of the Connecticut valley south 

 of the Upper Ammonoosuc river. It is likely there was originally a 

 wider basin here, allowing of the quiet deposition of the upper forma- 

 tions, which are wanting farther south, at least continuously. The aver- 

 age dip of the strata is also less over this basin than in the district south 

 of Bath. 



In noting these ranges I will begin with the eastern, commencing at 

 the south end of the clay slates. This is at the point where the forma- 

 tion divides into two parts. A road crosses it exactly along this line, in 

 company with a brook. The schists are not as green as usual, though 

 having a high north-westerly dip. Near the slate there is a large mass 

 of white quartz, extending certainly a quarter of a mile along the strike. 

 Lower down there is very much dolomite. Near the mouth of Perch 

 Pond brook the green schists dip north-westerly. Below Bath station, 

 on the railroad, the rock is conglomeratic, with blue quartz pebbles. A 

 mile from the station the schists dip y^° N. 48° W. The dip near the 

 Bath town-house is similar. The rocks are nearly the same as to variety 

 and position at the station. There is a conspicuous vein of white quartz 

 on the hill west. In Bath lower village are several enormous blocks of 

 hydro-mica schist, which probably indicate the character of the underly- 

 ing ledges. Similar rocks occur at a starch mill about a mile up the 

 Wild Ammonoosuc river, adjoining the Swift Water series. There are 

 green schists on the Lisbon road, about a mile north of the station, near 

 the top of the hill. Probably most of the rock in the easterly bend of 

 the river in this neighborhood is of the same sort. Near the mouth of 

 Smith brook it seems to be crowded on to the other side of the Ammo- 

 noosuc. Nearly opposite the strike is S. 75° W. At the mouth of Mill 

 brook, Landaff, there are green schists dipping 70° N. 42° W. With 

 this is a quartz vein, two feet wide; and the accompanying rocks are 

 slightly calciferous and pyritiferous. The ledges are well exposed at the 

 dam across the river, and also a little lower down. Half a mile below 

 VOL. II. 36 



