GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. 165 



It docs not appear there, because so completely covered by drift. Ec- 

 low this slate we found an interesting slate breccia, like that on Mt. Wil- 

 lard, with a westerly dip. Under this and the slates, in proceeding 

 easterly, we found a great thickness of the spotted granite in ledges. 

 Beneath this is upwards of a mile breadth of the Conway granite. But 

 I suppose the first small eminence north of Cascade brook, at the very 

 foot of Mt. Tom, and adjacent to the Crawford house, is made up of the 

 harder Montalban granites. On another line of descent, not more than 

 a mile north of that just mentioned, the same order of granites was ob- 

 served below the slates. 



A trip was taken to the north of Mt. Andalusite to determine more 

 carefully the relations of the slates and granites, as well as to search for 

 a compact variety of the spotted or Albany rock, so nearly resembling 

 labradorite as to have been originally mistaken for it. The first rock 

 north of the slate proved to be the Albany, which we followed for a 

 mile or so, with planes dipping north-easterly four or five degrees. This 

 continued for about three hundred feet down the easterly slope, where 

 the Conway granite was encountered, and may be one thousand feet 

 thick. The peaks to the north of this, as far as the lower falls of the 

 Ammonoosuc, near the White Mountain house, are entirely composed of 

 the Conway granite. 



Mt. Willard. Mt. Willard is a small mountain situated directly in the 

 water-shed between the Saco and Ammonoosuc basins, to the west of 

 the Notch. In the heliotype op^^osite page 79, Volume I, the view from 

 the Crawford house, it may be seen rising up from the Notch on the 

 right. It is 926 feet above the Crawford house, by a recent aneroid 

 measurement. The northern slope is not steep, and has over it a great 

 thickness of glacial drift, upon which large trees grow abundantly. On 

 the south side is a bare precipice of a thousand feet depth, one of the 

 largest seen about the mountains. A carriage-road winds to the summit ; 

 and the view of the Notch below is exquisite, though poorly represented 

 opposite page 625, Volume I. Since that drawing was prepared, a very 

 conspicuous line has been cut out around the west side of the valley, 

 high up, marking the position of the Portland & Ogdensburg Railroad. 

 The excavations on the steep side of Mt. Willard and farther south, for 

 the benefit of this railroad, enable us to speak of the rocks along the 



