GliOLOGY OF THE WHITE MOUNTAIN DISTRICT. 163 



limit of the Montalban group, and it may be from three fourths to seven 

 eights of a mile west from the Crawford house, by estimate, and perhaps 

 several hundred feet of elevation. 



Nearly a quarter of a mile beyond, a granite allied to the Conway 

 shows itself, with the prevailing numerous joints dipping a few degrees 

 easterly. The constituent minerals resemble those of the rock just 

 passed over, but are considerably larger. All the outcrops for at least 

 three fourths of a mile are of this character. At the lower end of an 

 unusually broad opening it is very ferruginous; the joints are inclined 

 less than five degrees, and the grain is more like that of the first rock. 

 It is just above this that the north side is bare of trees ; and in the val- 

 ley there is a great abundance of a vermilion vegetable coating spread 

 over the boulders and ledges. The lower exposures are of great impor- 

 tance, because the granite contains many fragments of the hard Mont- 

 alban schists, sometimes from twelve to fourteen feet long. Several of 

 them seem to carry andalusite quite abundantly. It is not clear whether 

 these fragments are distinctly Montalban, or whether they agree with 

 the dark slates found higher up the mountain, and also back of Mt. Wil- 

 lard. They would be clearly ranked with the first, unless the metamor- 

 phic influences of the granitic paste have altered the character of the 

 upper slate. This is the only example yet discovered which seems to 

 intimate the possible origin of the Conway granite as later than the 

 deposition of the dark andalusite slates. In a similar brecciated mass 

 by the side of the railroad, under Mt. Willard, the fragments are en- 

 tirely of the lower schists ; and the imbedding granite more nearly 

 resembles the Albany, while the Conway is adjacent. Upon Cascade 

 brook the cementing granite is more abundant than in the latter locality. 

 In both cases, one can recognize near each other fragments of the same 

 mass. 



Higher up this stream there is a great abundance of the Conway 

 granite, with its usual features. At about two and a quarter miles, by 

 estimate, there seems to be a limited outcrop of a spotted granite, por- 

 phyritic by numerous crystals of orthoclase, in contact with slate. A 

 similar contact will be described upon the south side of Mt. Willard, 

 further on. As no ledges show themselves for a considerable distance 

 below the line of junction, we have no data for determining the width of 



