HEAD WATERS OF THE ANDROSCOGGIN. 359 
Cupsuptic. On the Kennebago, the rock is fissile slate; on the Cupsuptic, the rock is 
an argillaceous schist; but the summit, at least of the north-west peak, is granite. 
From the point where the streams unite in No. 4 R. 3, a range of mountains on the 
west side of the Kennebago runs north-west; and on the east side of the river a range 
runs north-east. Between these ranges are the streams mentioned above as widening 
into lakelets. 
The area about the lakes was briefly mentioned by Prof. C. H. Hitchcock in the re- 
port of the scientific survey of Maine for 1862. 
The conglomerate found at the outlet of Rangeley lake has been described by Prof. 
Geo. L. Vose. Some notes on the geology of the area north-east of Kennebago river 
were presented at the Portland meeting of the American Association for the Advance- 
ment of Science. The rocks found on the west of the Cupsuptic have been described 
by me at some length in the report of the geological survey of New Hampshire (Vol. 
II). As I understand the rocks, the following formations are represented : 
I. STRATIFIED GROUPS. 
Gneiss. 
; 
Gneiss containing limestone. 
lL 
LauRENTIAN. 
White Mountain gneisses and schists. 
Mica schists with staurolite. 
Chloritic and whitish argillitic mica schists. 
Sandstone schists. 
Diabase. 
Huronran, 
eu 
Diorite with serpentine. 
Argillitic mica schist with staurolite. 
Rangeley conglomerates. 
Wrinkled argillaceous schists with hard micaceous bands. 
; Slaty conglomerates. 
Pauzozoic. 
Calcareous sandstones with fossils. 
(Glacial drift. 
| Media drift, including kames, etc. 
Cenozoic. 
II. Eruptive Rocks. 
Granite (Conway). 
Diorite. 
Felsite. 
Gneiss. The area of gneiss is very small, and it was seen only on the boundary on 
the head waters of the north-west branches of the Kennebago river. It is a fine-grained 
