74 STRATIGRAPIIICAL GEOLOGY. 



hydro-mica schist. The apparent dip is towards the north-west; that, 

 also, is the dip of the schist.' Southward, in the Dartmouth College 

 grant, on the Swift Diamond, and about two and a half miles west of the 

 Magalloway, there is a band of granitoid gneiss perhaps three fourths of 

 a mile wide. It is not quite so fine in texture as the last mentioned, but 

 otherwise it closely resembles it. On the west there is a staurolite 

 gneiss, which rests upon it. On the east there are mica and hornblende 

 schists, the strata of which are almost perpendicular, but they have evi- 

 dently been much distorted. 



The granitoid gneiss outcrops in Wentworth's Location just west of 

 Wentworth pond ; and boulders of this rock, or one very similar, can be 

 seen along the road south of Bragg's bay. It is one of the most beauti- 

 ful building stones to be found in the state. In Errol, north of the road 

 and extending into Millsfield, a rock similar, but not so even in its texture, 

 can be seen. A rock in which the marks of stratification are very ob- 

 scure, but which in its characteristics closely resembles a granitoid gneiss, 

 outcrops in Dixville just at the gate of the Notch on the east. In Mills- 

 field, west of Millsfield pond, and in the north part of the town of Odell, 

 and in the central part extending nearly to Trio ponds, there are exten- 

 sive outcrops of granite. In the west part of Millsfield there is a high 

 mountain ridge of granite, rather fine in texture, the feldspar of which 

 is white. Westward in Odell there are three parallel granite ridges. 

 Here the texture of the rock is very similar to that of Millsfield, but the 

 feldspar is flesh-colored. West of Odell in Stratford the rock changes ; 

 and here we find a very coarse granite, composed mostly of feldspar and 

 quartz, but there is a small quantity of black mica, and there is hardly 

 any doubt but that this is a genuine eruptive granite, and it is newer 

 than the stratified rocks along the Connecticut, since in Lyman brook, 

 where they come in contact, it has penetrated the schists in numerous 

 veins and beds. On the east shore of Umbagog lake there is a kind of 

 granite unlike any found elsewhere in northern New Hampshire. It is a 

 dark gray rock, and it is composed chiefly of quartz and brownish mica. 

 A similar rock is found in Vermont, near Island Pond. 



In Jefferson, near the Mt. Adams house, there is a granitoid gneiss 

 that contains a flesh-colored feldspar, light gray quartz, and minute scales 

 of black mica, unevenly distributed through the rock. The same kind of 



