HEAD WATERS OF THE ANDROSCOGGIN. 365 
ledges in their immediate vicinity. There 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 striz on Bald mountain, between Moosetocmaguntic 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 stria here are in the direction 
of Saddle-back mountain. 
Modified Drift, Kames, 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 find them. 
Fig. 64.—BaLpD MOUNTAIN. 
a, the lake; 4, schist on the border of the lake; c, granite; ¢, 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.1 and 2, there 
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