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—. «J _
THROUGH NORWAY WITH LADIES.
I should add. that Mr. G-eilde adopts the
hypothesis of a “ ground moraine,” or “ moraine
profonde,” to explain the origin of the till. So far
we agree, but he considers this to have been
formed on shore or in subaerial conditions. I
contend that it was formed as a deposit dropped
from the bottom of floating and thawing glaciers.
Both explanations accord with the composition of
the till, i. e. as containing all the debris of the
glacier, and the question between us is which
explanation encounters the fewer difficulties otherwise.
I fully agree with all Mr. Geikie’s arguments
against the hypothesis that attributes the till to
the droppings of mere icebergs.
The main difficulty of the ground - moraine
theory is that of reconciling the existence of such
a deposit with the tremendous erosive power of
the glacier moving over it ; especially when we
consider that at the time of its deposit from the
thawing ice, the matrix, the present stiff clay,
must have been a purée of thin slimy mud. To
me it is utterly inconceivable that a glacier
capable of eroding the hardest rocks, of scooping
out lake basins in the manner so forcibly described
by Mr. Geikie himself, could have rested upon this,
have ridden above it while depositing it, as it must
have done according to the ground-moraine theory.
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