coos AND ESSEX DISTRICT. 



51 



On Diamond ridge the rock is very much jointed. It may be the same 

 as the rock northward, only more indurated, but as the same rock occurs 

 on Magalloway mountain, some two and a half miles to the south, and 

 dips in an opposite direction, this may be an ^ ^^ ^ 2, 



island of older rocks. A small area of a gneissic | 5 

 rock between the two points also very strongly S ^ 

 suggests the same thing. Almost directly south 

 from Magalloway mountain, about two miles, on 

 a branch of the Little Dead Diamond, there is 

 an outcrop of clay slate, but, it is so intimately 

 associated with the gray schist, it is quite evi- 

 dent that they are stratigraphically the same. 

 The gray siliceous schist is found on the west- 

 ern slope of Mt. Pisgah, while to the south the 

 slate outcrops on the branches of Cedar stream 

 in a synclinal axis. On the water-shed between 

 Cedar stream and the Swift Diamond there are 

 argilk jeous bands. A short distance south of 

 this water-shed the gray siliceous schist is the 

 only rock, but as it extends southward it changes 

 somewhat its physical characteristics. The rock 

 at Dixville notch differs from the gray siliceous 

 schist northward more in its cleavage than in 

 any other characteristic. The general features 

 of the Notch have already been described.* The 

 rocks here form a monoclinal axis, and the strata 

 are nearly vertical. A peculiar cleavage causes 

 it to split into longitudinal fragments, and leaves 

 high vertical walls on the sides of the Notch. 

 At one point there is a good profile, the outline of which is seen in Fig, 

 10. Where the schist comes in contact with the granite, on the east side 

 of the Notch, it shows clearly the effect of pressure. This band of rocks 

 below the Notch has a south-easterly trend. The argillaceous rock in 

 Millsfield, east of the ponds, belongs probably to this group. 



* Vol. I, p. 641. 



