There are faint indications of other
terraces in Glen Roy, even at a higher level than the uppermost parallel
road, owing their origin probably to the short duration of a higher
level of the glacier-lake, when the great general glacier had not yet
been lowered to a more permanent level determined by a limited
circumscription within the walls of the valleys. There are other
terraces in neighboring valleys at still different levels,--in Glen
Gloy, for instance, where the one horizontal road was no doubt formed in
consequence of the damming of the valley by a glacier from Loch Arkeig.
Mr. Darwin has seen another in Glen Kinfillen, which I would explain by
the presence of a glacier in the Great Glen, the marks of which are
particularly distinct about the eastern end of Glen Garry.
The evidence of the ancient presence of glaciers is no less striking in
other parts of the Scotch Highlands. Between the southeastern range of
the Grampian Hills, in Forfarshire and Perthshire, and the opposite
ridge of Sidlaw Hills, stretches the broad valley of Strathmore. At the
time when Glen Spean received the masses of ice from the slopes of the
western Grampian range, the glaciers descended from the valleys on the
southern slope of the southeastern range and from those on the northern
slope of Sidlaw Hills into the capacious bed of the valley which divides
them.
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