122 GLACIAL PHENOMENA IN MAINE. 
greenstone dikes exhibiting also the character¬ 
istic markings; and an immense median mo¬ 
raine in the same locality cannot escape notice. 
A few miles to the west of West Waterville a 
terminal or front moraine is thrown across the 
neck of the lake, forming a barrier to which 
this sheet of water owes its existence. Half¬ 
way between Waterville and West Waterville 
are tine polished and striated surfaces. At 
Clinton, as also between Etna and Newport, 
the marks are very distinct. In all these 
localities the lines run due north and south. 
To the west of Bangor the country is rolling 
and rather flat. Here the rockes moutonnees 
are numerous, with polished surfaces, upon 
which the scratches and grooves are very dis¬ 
tinct, but bearing generally north-northwest, 
over beds of slaty rock striking northeast. 
These rocks are partially covered by drift, in 
which scratched pebbles are not rare, though it 
contains but few large boulders. In the imme¬ 
diate neighborhood of Bangor, and especially 
near Pusliaw Lake, the roches moutonnees are 
very extensive, and, from their character, par¬ 
ticularly instructive. These rolling hills are 
formed by thin upturned clay-slate beds, stand- 
