106 CONTRIBUTIONS TO THE GEOLOGY OF MAINE. [bull. 105. 
mile distant — the contact metamorphism indicates nearness to the 
igneous mass. 
The granite itself is not uniform in appearance. In parts of the 
field it is almost black; in others it is of a light color. The dark and 
the light areas are not confined to any particular locality, and the 
transition from one to the other may occur within a few inches or 
may be imperceptible for rods. The light parts may contain areas 
and streams of the dark, or the dark parts be smeared and banded 
with the light, without any apparent regularity as to size or shape. 
It is similar to the appearance produced by the presence of dark 
aggregates in granites, but is on a larger scale. 
The field relations indicate that this is an intruded mass. No con- 
tact was seen, but the sedimentary rocks near by are metamorphosed 
in proportion as they approach the granite. There are no lavas or 
other extrusive materials found within miles of this outcrop, although 
they are abundant in the region. The granite is a small area sur- 
rounded b}^ sedimentary rocks, and seems to have been recently 
uncovered by the great general denudation which northern Maine 
has suffered. 
In the bed of the Aroostook River, at the base of the granite hill, 
are dikes of aplite, syenite, and kersantite, which vary in width from 
a few inches to 500 feet. They have been intruded between the sedi- 
mentary strata, which are altered in consequence. As to their origin 
and time of formation, these dike rocks arc referred to the granite 
mass. 
DREWS LAKE GRANITE. 
The granite of Drews Lake forms a somewhat conspicuous feature of 
the landscape. The country here is a low, rolling, wooded plain with 
many swamps, and the granite constitutes part of a group of hills and 
low knobs standing out in contrast to the general level. In the depres- 
sions between the hills is a group of lakes which constitute the head 
waters of branches of the Mattawamkeag, which flows southwesterly to 
the Penobscot, and of the Meduxnekeag, which empties into the St. 
John. The shores and bottoms of these lakes — this whole region, in 
fact, is strewn with large, angular, granite bowlders. The eminences 
here are in some cases granite; in others, highly metamorphosed schists 
and altered slates. The schists seem to be remnants of the ancient sur- 
face rocks, which in part have been wholly worn away, but in places 
still cover the granites. The granite hills are general^ rounded, but 
in places present craggy, jagged profiles. Hitchcock 1 has mentioned 
this area and roughly outlined it on his geologic map. He considers 
it, together with several exposures to the southwest, to be part of one 
large mass typically exposed at Island Falls. This relationship is not 
indicated by the mass under discussion, which is not large and is nearly 
1 Agriculture and Geology of Maine, 1862, p. 360. 
