136 GLACIAL PHENOMENA IN MAINE. 
skeleton of a fossil animal. In the face of 
these facts it seems preposterous to assume 
that the loose materials and boulders scat¬ 
tered over this interval should have been 
stranded by icebergs driven inward from the 
sea-shore by currents or tidal waves. The 
whole movement, whatever its cause, was un¬ 
questionably in the opposite direction. The 
testimony of the loose materials and erratic 
boulders is the same all over the United States. 
They are always of northern birth. I have 
never seen a single fragment of rock from any 
more southern locality resting upon glaciated 
surfaces to the north of them, though I have 
searched for them from the Atlantic coast to 
Iowa. 
The picturesque island of Mount Desert lies 
on the southern shore of Maine, in Hancock 
County, and is separated from the mainland 
by a narrow arm of the sea. Much higher in 
the centre than on the margin, its mountains 
seem, as one draws near, to rise abruptly from 
the sea. It is cleft through the middle by a 
deep fiord, known as Somes’s Sound, dividing 
the southern half of the island into two un¬ 
equal portions ; and its shores are indented by 
