GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. II 7 



is a small stream running southerly. The next rock (No. 17) is slaty, 

 dipi^ing N. 43° W. Underneath a clayey rock is a sandstone (No. 18), 

 dipping 50° N. 28° W. No. 19 represents a conglomerate trap, cutting 

 the strata, probably, as it is inclined 85° N. 43° W. No. 20 is from a 

 mass of coarse indigenous granite. No. 21 is a slate dipping 20° N. 43° 

 E. It is interstratificd with beds of granite, fifteen to twenty feet thick ; 

 No. 22, a little farther along, dipping twelve degrees in the same direc- 

 tion. There is a sharp angle in the road here; and minute undulations 

 in the strata are observable, the first of them being much steeper than 

 the rest, or 30*^-40° N. 83° W. The rocks are mica schist, six feet thick- 

 ness of granite, a slaty curve over ten feet of granite, and compact quart- 

 zite. No. 24 dips 75° N. 63° W. A little higher up two rock masses 

 join each other, through an interesting fault, the positions being 80° west 

 and 25° N. 38° W. At the second mile-post a massive andalusite rock 

 dips 50° N. 58° W. (No. 25). There is a small hill just beyond, at a sharp 

 bend in the road. No. 26 dips 60° N. 43° W. No. 27 changes abruptly 

 to 25° N. ^8° E. at the next bend in the road. The rock is shaly and 

 twisted. Above a long northerly stretch in the road the strata are partly 

 fine sandstones, dipping 30° N. 38° W. No. 28 is rather more slaty, a 

 very fine exposure dipping 30° N. 38° W. This is just below a long 

 bridge over a stream flowing north-easterly. On the upper side of the 

 bridge there is a considerable banded granite (No. 29), in beds two feet 

 thick, dijDping 35° N. 38° W, The adjacent schist displays minute cor- 

 rugations, reminding one of ripple-marks in sedimentary sandstones. 

 Not a great distance higher up there are other thin beds of granite, con- 

 taining large crystals of black tourmaline. The strata are wavy for a 

 considerable distance, and then plunge into the mountain vertically, the 

 steep dip being the first part seen in the ascent. 



Nos. 30 to 35 are taken from a series of ledges about three quarters 

 of a mile in length, most clearly exposed by the recent removal of earth 

 and by blasting. The rock is an argillo-mica schist, quite evenly bedded, 

 well filled with crystals of andalusite, and of the ordinary slate color. 

 The small curvatures in them are endless, and almost baffle all attempts 

 at description. They resemble billows in the ocean, each three or four 

 feet high, and the positions of their crests and hollows are easily deter- 

 mined. There is one special feature among them of importance, viz., 



