586 STRATIGRAPHICAL GEOLOGY. 



with the strike N. 70° E. The road started out to the north-east, but 

 after passing Pkmibago point it changes to north-west, passing along the 

 crest of the mountain, receiving the name "Mission ridge." The rock 

 is a hard, brittle, fine-grained granite. At its north end, near the "White 

 house," at the beginning of trees, the hard schists dip N. W. 85°. Large 

 veins of a porphyritic granite, a little like the Albany, appear next. A 

 quarter of a mile higher up this granite has planes dipping 50° W. 

 Others dip 10° S. Half way to the " Garden" quartzites dip 75° S. 62° E. 

 Further on they contain scattered crystals of andalusite, and dip east. 

 Near the Garden the dip is 50° N. 50° W. At the last abrupt turn in 

 the road the dip is N. 40° W. In the depression called the "crater" the 

 dip is 70° N. 52' W., the rock being mostly an andalusitic quartzite, in 

 strata resembling sandstone. On the very summit the dip is N. 35° W. 

 On descending to the Winslow house the dip veers more northerly. At 

 the top of the clearing below the woods, I measured dips S. 35° and 40° E. 

 At the hotel the dip is 80° N. 80° W. A quarter of a mile below this 

 house the dip is 85° E. There is a ledge of mica schist near the east line 

 of Wilmot, below the hotel. Taking another route down the north-east 

 side, in Andover, I found the dip becoming northerly ; also an interest- 

 ing curvature with a quartz vein, which is delineated in Fig. loi. The 

 ledge had been cut by a joint, leaving a nearly vertical smooth surface, 

 fifteen feet high and forty long, showing two curvatures. The axis of the 

 folds runs N. 42° E. The vein occupies a fissure where the rock had 

 been subjected to the most pressure. At the edge of the woods the dip 

 is 30° N. 18° W. Lower down are abundant crystals of andalusite two 

 inches long. Before reaching the lower edge of the forest the strata are 

 vertical, with the strike N. 50° E. At a saw-mill the dip is 85° N. 40° W., 

 much andalusite being present. Nearly down to the road, parallel with 

 the west line of Andover, the dip is 75° S. 30° W., though more usually 

 N. 30° E. In a sort of meadow north of the "pyroligneous acid manu- 

 factory" of the county map, the rock resembles the Montalban schists, 

 crowded with foldings and inclined perhaps S. 80° E. Between Cilley- 

 ville and Potter Place a dark quartzite dips 70° N. 70° W., and the rock 

 is said to be plumbaginous. On the west side of Mt. Kearsarge in 

 Sutton, on an old road to S. S. Felch's, the mica schist dips 85° N. 80° W. 

 It lies next to porphyritic gneiss. The south-west and east sides of the 



