And now, if it be asked how much of this evidence for the former
existence of glaciers is to be found in Great Britain, I answer, that
there is not a valley in Switzerland where all these traces are found in
greater perfection than in the valleys of the Scotch Highlands, or of
the mountains of Ireland and Wales, or of the lake-region in England.
Not a link is wanting to the chain. Polished surfaces, traversed by
striae, grooves, and furrows, with a sheet of drift resting immediately
upon them, extend throughout the realm,--the _roches moutonnees_
raise their rounded backs from the ground there as in
Switzerland,--transverse moraines bar their valleys and lateral ones
border them, and the boulders from the hill-sides are scattered over the
plains as thickly as between the Alps and the Jura, and are here and
there perched upon the summits of isolated hills. This being the case,
let us examine a little more closely the local phenomena connected with
the ancient extension of glaciers in this region, and especially the
parallel roads of Glen Roy.
[Illustration:
G. R. Glen Roy.
M. Moeldhu Hill.
S. Spean River.
G. S. Glen Spean.
L. Loch Laggan.
T. Loch Treig.
G. Glen Gloy.
L. O. Loch Lochy.
A. Loch Arkeig.
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