56 STKATIGRAPHICAL GEOLOGY. 



of intrusive granite, which, in lithological characteristics, corresponds to 

 the area west of the Montalban group in the valley of the Ammonoosuc. 



Where Specimens were obtained, and the Dip of the Strata. 



At Crown monument the rock is an arenaceous schist, that dips S. 79° 

 E. 'j^^ . On the state line, a mile and a half from Crown monument, 

 there is a greenish siliceous schist that dips S. 82° E. 65°, The rock, 

 two and a half miles south-west of Crown monument, is serpentine, but 

 the strata are quite obscure. Across the boundary in Chesham, in 

 R. Ill, in L. 4, 6, and 7, there is an arenaceous sandstone that dips N. 

 70" E. 20°. This rock forms the boundary north of the lake which is 

 the source of the west branch of the Magalloway. At Magalloway lake, 

 which is not far from three and a half miles south-west of Crown monu- 

 ment, and less than half a mile from the boundary, the rock on the south 

 side is a mica schist, that dips N. 41° E. 56°. At the outlet of the lake 

 the dip is N. 39° E. 'j6°. Four rods from the outlet there is a cascade 

 that has a fall of twenty feet. Three fourths of a mile from the lake 

 there is a greenish mica schist, the strike of which is N. 38° E. The 

 dip is exceedingly variable, but westerly. Passing" over the Coos group, 

 going south-west, we strike Huronian rocks in the vicinity of Third 

 lake. On the west shore of this lake the arenaceous schist dips N. 42° 

 E. 80°, but the stratification is quite indistinct. On the south shore of 

 the lake there is a green siliceous schist, that dips N. 50° W. 85°; and 

 on the east there is a greenish, stratified diorite. North, on the water- 

 shed that is the boundary between the state and the province, the arena- 

 ceous schist splits into thin laminse, is somewhat variegated, and the strata 

 are vertical. The highest part of the ridge is diorite, which forms cliffs 

 of considerable height. South-west, one fourth of a mile from the lake, 

 the diorite outcrops, and three fourths of a mile, the arenaceous sand- 

 stone, which dips N. 28° E. 80°. On the old "tote "-road, a mile and 

 a quarter from the lake, the diorite outcrops, and dips N. 40° E. 78°. 

 A mile and a half south, on the north border of a tract where there 

 was a hurricane many years ago, the diorite outcrops, while fifteen rods 

 south the schist appears, and dips N. 40° E. ^6°; and forty rods south, 

 where the hurricane stopped, the diorite again outcrops. Between the 

 "tote "-road at this point and Perry stream the diorite alternates with the 



