90 



STRATIGKAPIIICAL GEOLOGY, 



Connecticut. The strata stand at a high angle, and have an easterly 

 dip. Near the granite the strata are everywhere penetrated by veins of 

 granite; but the veinstones are of a much finer texture than the mass of 

 the granite. 



West of the Connecticut the first outcrop is an argillaceous schist, 

 with an easterly dip. Where the section crosses Mill brook we have the 

 same rock, but west the rocks become micaceous, and the strata are 

 everywhere nearly vertical. Between East Branch and Yellow brook 

 there is a granitoid gneiss, which appears to have a westerly dip of 15°. 

 Between Yellow Branch and Island Pond there is the same granitic rock 

 that is found at Umbagog lake, and it consists chiefly of a dark gray 

 quartz and brownish mica. This is succeeded by a mica schist, probably 

 of the Montalban group, with a westerly dip. 



Section XI. 



Section XI passes through Success, Milan, Stark, and Northumber- 

 land. This section begins on the line of Maine, near the northern border 

 of Success. At the line the height is 1690 feet. There is, perhaps three 

 fourths of a mile north of where the section begins, an outcrop of horn- 

 blende schist ; and following the line of the section there are no outcrops 

 of rock for two or three miles, but there is an abundance of boulders of 

 the White Mountain gneiss, — so it is altogether probable that that is the 

 rock underlying the drift. Four miles and a half from the line of Maine, 

 at an old logging camp, there is a hornblende schist which has an east- 

 erly dip. This rock continues to outcrop for a mile; thence to the 

 Androscoggin there is nothing but drift, though it is probable that this 

 rock continues to the river. Going west from Milan Corner, the first 

 rock we find is a gneiss that dips nearly north, but generally N. 15° W., 

 and not more than 15° or 20°. The height of Milan hill is 1460 feet. 

 Succeeding this on the west is a hornblende schist, probably a repetition 

 of that on the east of the gneiss, on which it rests unconformably. At 

 West Milan we find a gray siliceous schist, with bands of hornblende 

 schist, the strata of which are nearly vertical. Near the line of Stark 

 there is a slight change, and the rock becomes more siliceous. In places 

 the strata, as on Phillips brook, are vertical. We find, also, that they dip 

 both east and west, l-'ollowing the Upper Ammonoosuc these rocks 



