GEOLOGY OF THE CONNECTICUT VALLEY DLSTRICT. 319 



direction, as the ledges there are all covered by drift. There is a beau- 

 tiful display of large staurolites on the road from the furnace, a little 

 north of west over a hill towards the north-west line of quartz, passing 

 by the names D. A. Oakes, J. Bowles, etc., of the county map. On Sal- 

 mon Hole brook the staurolite mica schist agrees with the slate in posi- 

 tion, viz., 85° W, Recorded observations are meagre north of Mink 

 pond ; but the usual dip is north-westerly to westerly. A hornblende 

 schist occurs near H. N. Page's, on the west side of the gneiss and 

 quartz ridge. Near Mink pond the dips are 65° N. 57° W., N. 42° W., 

 and N. 72° W. (See Fig. 28.) The formation narrows in proceeding 

 southerly into Landaff. It seems to cross Mill brook three fourths of a 

 mile below the village, the garnetiferous ledge dipping 80° N. 52° W. It 

 may possibly be represented in argillaceous schist layers near the school- 

 house at the west base of Green mountain ; though we have not yet fully 

 established in this neighborhood the boundary between the Coos and 

 Swift Water series. We find quartzite by the Baptist church, about a 

 mile from the north line of Landaff, dipping at a low angle north-west- 

 erly, and a larger conglomerate exposure west of W. Hunt's. Our notes 

 speak of quartzites also following the limestone of the Bronson range in 

 Lisbon. These are on the same strike with the outcrops at the Baptist 

 church and at Hunt's. The range is parallel with that on the north-east 

 road between Jesseman's and Hildreth's, and may occupy a synclinal fold 

 of the same stratigraphical horizon with that. The latter line of out- 

 crop may divide the mica schists stratigraphically, as it does territorially. 

 There is no evidence to prove that the slates on the west of the schists 

 have been folded. The quartz is beautifully developed farther south 

 through Landaff, Benton, Haverhill, etc., passing into the mountainous 

 masses referred to the Coos group. These will be described further on, 

 in the next division of the Connecticut Valley rocks. 



There is considerable variation in the aspect of the staurolite rocks. 

 We have fine-grained homogeneous clay slates, with slender staurolites. 

 Then there are coarsely-crystalized ledges of mica, staurolite, and garnet. 

 Perhaps the most characteristic is an argillaceous schist, with numerous 

 stems of staurolite about three inches long, of a reddish-brown color, 

 cutting through the rock in various directions. The staurolite is also 

 found in a gray micaceous rock, and in the western edge of the gneiss 



