Similar markings streak and score the rocks up to
a great height in the deep valleys of the Highlands."[1]
We can realize, in our imagination, the glacier of the
mountain-valley crushing and marking the bed in which it moves, or
even the plain on which it discharges itself; but it is impossible to
conceive of a glacier upon the bare top of a mountain, without walls
to restrain it or direct its flow, or higher ice accumulations to
feed it.
Again:
"If glaciers descended, as they did, on both sides of the great
Alpine ranges, then we would expect to find the same results on the
plains of Northern Italy that present themselves on the low grounds
of Switzerland. But this is not the case. On the plains of Italy
there are no traces of the stony clay found in Switzerland and all
over Europe. Neither are any of the stones of the drift of Italy
scratched or striated."[2]
[1. "The Great Ice Age," p. 73.
2. Ibid., pp. 491, 492.]
{p. 22}
But, strange to say, while, as Geikie admits, no true "till" or Drift
is now being formed by or under the glaciers of Switzerland,
nevertheless "till" is found in that country _disassociated from the
glaciers_.
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