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carried by the ice-flow from the surrounding
mountains, and during the vigorous period of its
mature existence would, by its continuous
overflow, transfer this to the outlet glaciers of the
radiating valleys ; but when its decay commenced
this overflow would diminish and presently cease,
the residual and still considerable accumulation
melting on the bed of its own plateau, During
this melting process the water produced by the
thaw would wash away the minute particles of slaty
rock, or decomposed feldspar, &c., that is, the slimy
matter capable of producing clay when deposited
without disturbance; but this gently flowing water
would leave behind the larger particles of gritty
quartzose and other rock matter capable of forming
sand and gravel. Such residuum would obviously
correspond with that which I have described.
The soil of the glacier farms, already described
as so curiously characteristic of the Arctic and
subarctic coast of Norway, is similar to this, and I
have no doubt has been formed in like manner.
I have observed another deposit nearly
resembling this, and covering the surface of many of
the terraces. This appears to be due to a washing
and redeposition of the underlying till; the
washing effected in some cases by rivers, and in others
by sea waves breaking on an ancient strand of
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