GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 373 



the beautiful quartzite culminating in Piermont mountain, and terminat- 

 ing in the north part of Orford. Then there follow, possibly connected 

 directly with the preceding, the mass of Mt. Cuba, and several isolated 

 patches in Wentworth and Dorchester. Next, there is a Lyme range; 

 then comes the Moose Mountain mass in Hanover, terminating obscurely 

 in the east part of Lebanon. Several insignificant outliers occur in the 

 gap ensuing before the quartzite gathers itself together to form the Croy- 

 don Mountain mass. Li Claremont and Newport there is another devel- 

 opment, seemingly curving round an area of Bethlehem gneiss. Towards 

 the river there is an interesting bed of quartzite, quite narrow, but dis- 

 cernible through Lyme, Hanover, and Lebanon. A few others will be 

 mentioned presently. 



]\rt. Cuba. A hasty climb of Mt. Cuba in Orford will show the rela- 

 tions of this quartzite to the accompanying schist. Starting from "Hall- 

 town" on the west side, and passing thence up the north edge of the 

 mountain, we leave Bethlehem gneiss standing on edge, and come to ex- 

 ceedingly twisted thin layers of rusty staurolite mica schist, with strike 

 N. 3° W. Another ledge standing vertically has the strike N, 5° E. 

 Still farther east, about one third of the distance up the mountain, the 

 same rock dips 85° S. 85° E. From a third to half the distance up, we 

 find quartzite dipping 70°, 75°, and 80° S. 20° E. After reaching the 

 first eminence, or outlying spur of the mountain, we again discover the 

 hard mica schist, — another mass, — but it is not extensive. The apex of 

 the mountain is composed of the quartzite, hyaline, and dipping N. 65° 

 W. I had no time to explore the woods to the south. In order to prop- 

 erly understand the relation of the mica schist and quartzite, we need a 

 model of the mountain carefully constructed from a perambulation of the 

 entire surface. Judging from all the data at command, it would appear 

 that this quartzite is of an oval shape, unconformably reposing upon 

 gneiss, with some intermixture of mica schist. Fig. 5 i shows its situa- 

 tion, in relation to the other rocks, as well as we can judge. The shape 

 of Cuba and Smart's mountains is such that, from a distance, one would 

 think the rock was continuous from one to the other ; but I believe ob- 

 servation does not verify this anticipation. It is not impossible, however, 

 that the Cuba Mountain mass should join the continuation of the Pier- 

 mont range. Between the two the ledges are concealed by soil; and 



