GLACIAL PHENOMENA IN MAINE. 121 
Never do we find winding, branching furrows 
determined by the inequalities in the hardness 
of the rock, or by pre-existing fissures, as is 
the case wherever rocks are worn by water, or 
rather by sand and pebbles set in motion by 
water. 
While upon the subject of glacial phenom¬ 
ena in general, and in order not to interrupt 
too frequently the account of my own journey, 
I may here enumerate some of the localities 
in the State of Maine where glacial marks are 
most distinct. They are so numerous, that I 
must limit myself to those where the traces 
are most remarkable. To the east of Port¬ 
land there are a number of ledges where they 
are well preserved, and they exist also upon 
some rocky surfaces in the islands of the bay. 
Rocky ledges occur frequently between Yar¬ 
mouth and Lewiston, the surface of which is 
polished and scratched from north to south. 
These ledges are partly covered by morainic 
accumulations. West of Lewiston, along the 
Little Androscoggin, there is a coarse clay 
slate distinctly scratched in the same way. 
To the east of Lewiston, along Lake Wintlirop, 
there are surfaces of clay slate intersected by 
