1 82 STRATIGRAPHICAL GEOLOGY. 



therefore occupy their proper places. Furthermore, we have as 3'et found 

 no indication of the uppermost rock in the southern development of Mt. 

 Webster across to Mt. Washington river. There are large boulders of 

 Chocorua granite in the last named valley whose source is unknown. 

 The granite cropping out at the angle between the Saco and Mt. Wash- 

 ington rivers is classed by us in our note-book with the Conway variety. 

 Up Sleeper's brook there is a ledge of schist, indicated in our collection, a 

 quarter of a mile above the Saco, but granite higher up ; and Giant's 

 Stairs is composed apparently of a fine grained variety of the Conway 

 rock. At the base of the stairs the rock is very fine grained and white. 

 Specimens from Mt. Resolution, and on the Davis bridle-path at two and 

 three fourths and three and a half miles north of the mouth of Mt. Wash- 

 ington river, are doubtfully referred to the Albany. Other specimens of 

 the same are put down between Mt. Crawford and Mt. Hope, and opposite 

 Nancy brook. The granite from the top of Mt. Crawford is like that 

 from Frankenstein cliff, but its western base belongs clearly to the lower 

 group. It here contains veins carrying fluorite, as on Mt. Webster. 



There are several varieties of rock in passing up Bemis brook. From 

 near the railroad I obtained a very interesting boulder of schist for the 

 museum, showing curves in the strata, and small dislocations. Its source 

 has not yet been ascertained, but the rock is like the andalusite slate. 

 The accompanying plate will make a description of the curves and faults 

 quite plain. The stone is forty-five inches long and thirty-six wide. The 

 view on the left represents the top, and that on the right the side of the 

 specimen. On the top we recognize four small anticlinal axes, and a 

 wedge-shaped segment driven into the stone a distance of five inches ; 

 but the longer fault shows a displacement of only about two inches. The 

 shorter fault has cut transversely through the first anticlinal, and the 

 longer one passes across the next anticlinal. The third and fourth are 

 unaffected by shoving. Turning to the side of the stone, these four axes 

 are observable, and one of the faults, which develops a new ridge. On 

 the left is a smaller fault, not connected with those on top. Of the anti- 

 clinals, the first is the farthest to the left; the second disappears; the 

 third is almost lost, broadening very much ; while the fourth is much 

 more prominent, appearing on the extreme right. The amount of shov- 

 ing along the fault is two inches. The width of this side of the fragment 

 is two feet. 



