360 APPENDIX TO PARTS I AND II. 



rock, and the outcrops were so few that the dip could not be well determined. As an 

 intrusive granite and a fine-grained diorite were the only rocks seen in the vicinity, its 

 stratigraphical relations have not been satisfactorily determined ; but its resemblance 

 to the Laurentian gneiss in the vicinity of the chain of lakes to the north-east makes it 

 altogether probable that it is a part of the Upper Laurentian. 



Gneiss with Limestone. Approaching the lake region from the east at the village of 

 Phillips, we find an intrusive granite that is somewhat coarser than the common Con- 

 cord granite. It extends a mile east of the village. On Sandy river, where the road 

 crosses the river for the first time above Phillips, we find the intrusive character of the 

 rock clearly seen, as here great masses of schist have been caught in it ; and elsewhere 

 the granite appears only as veinstones in the schist. About two miles above the village, 

 on the north side of the river, there is a fine-grained micaceous gneiss that has inter- 

 calated beds of a dark limestone : this at some time has been burned for lime. The 

 whole breadth of country occupied by this gneiss does not here exceed a mile. The 

 stratum is very irregular in strike, and has an inclination of 30° to 50°. 



Hjironian — White Mountain Gneisses and Schists. These rocks, which belong to 

 the Montalban series of the New Hampshire geological survey, are found north-west of 

 the outlet of Moosetocmaguntic lake. The strata here have nearly an east and west 

 strike, and are vertical ; but this is probably due to a great mass of intrusive granite 

 between this and the river that joins the lakes on the south. The lithological charac- 

 ter of the rock is similar in every respect to the rocks found in the vicinity of Alt. Wash- 

 ington, and it is probably a continuation northward of the rocks so extensively devel- 

 oped along the Androscoggin river in Gorham, N. H., and eastward. This is near the 

 northern limit of these rocks in the area we have studied. 



Mica Schists with Staurolite. South of Moosetocmaguntic lake, in townships D and 

 E, and extensively developed in the town of Byron, is a series of rocks consisting of 

 fine-grained, thick-bedded mica schists that carry staurolite. These schists, wherever 

 observations were made, have a dip almost directly north ; and the inclination does not 

 usually exceed 45°, especially northward. From the south, they follow directly on the 

 White Mountain gneisses. 



Chloritic and Whitish Argillitic Mica Schists. North of the rocks last mentioned, 

 and east of the White Mountain gneisses, near the northern part of Moosetocmaguntic 

 lake, and extending east beyond the outlet of Rangeley, there is a series of rocks con- 

 sisting chiefly of chlorite and whitish argillitic schists. They are noticeable on account 

 of their unconformability with the rocks east and south, and the abundance of quartz 

 which they contain, and which lies in the line of the stratification. This rock forms 

 ledges at Frye's Camp, at Houghton's Camp, and on the ridge immediately south of 

 the Mountain View house at the outlet of Rangeley lake. 



Bald mountain, an isolated peak between Rangeley and Moosetocmaguntic lakes, al- 

 though chiefly granite south of the ridge just mentioned, has upon its top a great mass 

 of this schist, which was caught in the granite. Indian Rock, at the mouth of Kenne- 

 bago river, and famed in the annals of fishermen, is a wonderfully contorted argillite, 



