File:The Quarterly journal of the Geological Society of London (12980965095).jpg

202
PEOCEEDINGS OF THE GEOLOGICAL SOCIETY.
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trated on the lower than on the higher
terraces. Many of the blocks are
rounded ; in this respect differing
markedly from the majority of those
on glaciers, in moraines, and probably
from those transported by icebergs,
which, derived from glaciers that
reach the sea-level, obtain their debris
by the fall of rocks and stones on their
surfaces from inland cliffs. In the
American hills which I saw, there are
no signs of true glaciers like those of
the Alps having existed; and the
boulders have been transported by
floating ice from old sea-shores, where
they had been long exposed to the
washing of the waves.
At Hawksbury Mills I crossed the
Ottawa with Sir William Logan, and
penetrated part of the Laurentine hills
lying several miles from the north
bank of the river. Waterworn gravel
here and there rises nearly to their
summits, now rarely more than 500
or 600 feet above the river.
In the range about eight miles
north of the Ottawa, there are well-
rounded and occasionally grooved sur-
faces of gneiss, greenstone, and quartz-
rock, — the striations, where I saw
them, running 10° and 20° W. of S.
In many places, among the hills,
numerous half-rounded boulders (of
the same substances as those that
strew the plains of the Ottawa and
the St. Lawrence) cover the ground,
and appear as if they had been
waiting their turn for glacial trans-
portation, ere the country was raised
above the sea. These general signs
existing in this chain, in latitude 45-i-°
!N"., gave me more perfect confidence
in the universal glacial abrasion of
the hills on the coast of Labrador in
a latitude nearly 150 miles further
north.
Glacial Drift of the Plains ; Strice;
and Roches moutonnees. — I need not