8 THE GKANITES OF MAINE. 
with granite, which extends southward and eastward through seven 
counties, reaching the coast at Casco Bay on the west and Penobscot 
Bay on the east, Southwest of this area is a mass of granite, which 
constitutes the eastern extension of the White Mountain massif of 
New Hampshire and reaches the coast at Casco Bay, Cape Porpoise, 
and York Cliffs. 
The Mount Katahdin granite lies wholly within the forested region 
of northern Maine, and therefore its exact boundaries are unknown. 
At the northeastern end of the area is the highest elevation in the 
State, Katahdin, 5,268 feet above the sea, a typical granite mountain. 
To the southwest, possibly connected with this area, is the granite 
near Lake Onawa, where the rock is well exposed in a deep cut of the 
Canadian Pacific Railroad. 
In the eastern counties three extensive granitic areas may be dis- 
tinguished. Of these the northernmost extends southwestward from 
New Brunswick across the northern portions of Washington and 
Hancock counties into Penobscot, and almost wholly is forested 
country. Southeast of this is the horseshoe-shaped granitic area of 
Hancock County, which crosses into Washington County near Cherry- 
field. On the west the outlying Mount Waldo mass may represent an 
extension of the same granite, although connecting exposures along the 
Penobscot River below Bucksport have not yet been observed. In the 
Hancock County area the granite can be traced from the shore of 
Eggemoggin Reach northward along a line of prominent hills, which 
are best seen from the Maine Central Railroad near Green Lake. 
North of Aurora these granite hills have less relief, but east of that 
place the belt extends southward with increasing rugged ness of topog- 
raphy, Tunk Mountain, near the Washington County Railroad, being 
characteristic of this southern portion. 
The other occurrence of granite in eastern Maine is the belt extend- 
ing from New Brunswick across the St. Croix, then southwestward 
to the coast at Addison, and thence along the coast to Penobscot Bay. 
Within this belt are included several large islands — Swans, Deer, 
and Vinalhaven — and the mountains of Mount Desert owe their toj to- 
graphic prominence to the massive character of the granite compos- 
ing them. 
Of the smaller areas of granite not included within the three groups 
described above, that in Lincoln County comprises the town of Waldo- 
boro and islands at the head of Muscongus Bay. The Hallowell- 
Augusta area in Kennebec, the North Jay and Phillips area in 
Franklin, and the Hartland and Norridgewock areas in Somerset 
County represent the larger of many small intrusive masses of granite 
in central Maine. With these should be mentioned the granite oc- 
currence in Aroostook County, about 12 miles west of Houlton. 
In the preparation of the map (PL I), showing the distribution of 
