HEAD WATERS OF THE ANDROSCOGGIN. 



365 



ledges in their immediate vicinity. Tlaere is another great collection of boulders on 

 the Cupsuptic river below the gorge already referred to ; and these are derived from 

 the granite ridges on either side of the stream, — for, soon after we pass the granite 

 ridges, these boulders disappear. Elsewhere no great collections of boulders were ob- 

 served. 



The drift striae on Bald mountain, between iMoosetocmaguntic and Rangeley lakes, 

 are S. 55° E. ; near Rangeley, on the south side and near the inlet, S. 35° E. ; and on 

 the high land south-east of Dodge pond, S. 65° E. The striae here are in the direction 

 of Saddle-back mountain. 



Modified Drift, Karnes, etc. A few gravel ridges in the west part of Dallas Planta- 

 tion were the only gravel deposits resembling kames that were seen in the vicinity of 

 Rangeley lake. On the lower part of the Kennebago river there are some well marked 

 kames ; and their absence was also noted on the river till we get about ten miles north 

 of Kennebago lake, where there are some well marked ridges, but these do not extend 

 more than two miles. On Cupsuptic river there is an almost entire absence of kames, 

 as in the other regions we traversed ; but on the lower part of the Cupsuptic, for six or 

 eight miles, there are sand and gravel plains extending some distance from the river. 

 These sand plains are characteristic, also, of the Magalloway ; but, so far as our ob- 

 servation goes, they are wanting on the Kennebago. 



Eruptive Rocks. 



Granite. On the north-west branch of the Kennebago river, near its source, there 

 is a band of granite probably two miles wide. It is a typical variety, consisting of 

 quartz, feldspar, and mica in more nearly equal proportions than we often iind them. 



Fig. 64.— Bald IVIountaix. 



a, the lake ; b, schist on the border of the lake ; c, granite ; d, granite,— a narrow band near the top of the 

 mountain ; e, schist on the summit of the mountain. 



There are, however, two kinds of feldspar, the triclinic being more abundant than it 

 is commonly found in the coarser varieties of the New England granites. On the 

 Cupsuptic river, in No. 4, R. 4, we find a similar kind of granite, which extends north 

 and south nearly through the entire range. South-west, in No. 5, R. i and 2, there 

 VOL. III. 47 



