286 STRATIGRAPIIICAL GEOLOGY. 



this group. The more eastern portion Hes to the east of Gardner moun- 

 tain, reaching to Parker hill on the east, and separated by a band of slate 

 from the more western development. Fig. 30 indicates the positions of 

 the strata along a section from the valley of Smith brook, in the south 

 part of Lyman, over Hart's mountain to the villages of Monroe and 

 Mclndoe's Falls on the Connecticut. At the east end, near a school- 

 house, the shales or slates prevail, covering up the supposed underlying 

 Lyman schists. These are inclined towards Gardner mountain. Next 

 the Lyman group makes it appearance, with two supposed outcrops of 

 the auriferous conglomerate. The range on what has been called the 

 Dow farm, but now Martin & Swett's, is believed to stop short at the 

 base of the hill, and to be folded. The eastern developments of the con- 

 glomerate and overlying dolomite may be present beneath the slates just 

 mentioned. All the strata exposed dip in the same direction with the 

 slates. Just west of the dolomite, which crosses Smith brook by Steery's 

 house, the slates reappear in strong force, with a very high south-easterly 

 dip, making, probably, a synclinal- originally with those by the school- 

 house before the upthrow of the Lyman group between. The auriferous 

 conglomerate reappears at Jacob Williams's house, where it has been 

 excavated for gold. A considerable alluvium west of Williams's makes 

 it uncertain whether there may not be a small development of the Lyman 

 group ; but in passing up the Smith brook one soon beholds prominent 

 ledges, with nearly vertical dip, of green schists of the Lisbon group. 

 These are as well characterized as any in the whole field, and remind 

 one forcibly of the typical Huronian localities in middle and northern 

 Vermont. Within the distance of a mile is the place for copper sqhists 

 to appear, for it is believed there is an anticlinal axis between Williams's 

 and Davis's houses, so that the copper rocks of Gardner mountain should 

 reappear. For the same reason, the accompanying synclinal ought to lie 

 along the valley of the Grafton mine. The south-easterly dips incline at 

 a much smaller angle on the eastern slope of Gardner mountain range 

 than in the valley near Williams's. At the old Grafton mine the dips 

 are 55'^ S. E. at the surface, and 45° lower down. The copper schists 

 arc well developed along this section. At the lead mine the strata dip 

 62° S. 80° E. It is possible that much of the cast side of the mountain 

 belongs to the Lyman group. The resemblances to this member are 



