Abstract
ON July 4 last I was on Ingleborough with a party of geologists examining the swallow-holes which mark where the water, running off the impervious drift and shale above Newby Moss on the southern shoulder of the hill, first reaches the Mountain Limestone. Some of these swallow-holes are what we may call obsolete—that is to say, when new openings have been formed and enlarged as time went on, some of the chasms which obviously at one time carried off the flood-water from a large gathering-ground, now receive only what oozes in from the peat and drift immediately round it, or the rain which falls directly on it: and rain seldom falls vertically up there. Some of them seem to have been developed without any large body of water having ever invaded them. They run to great depths, the open shaft being from 30 to 360 feet deep, below which the cavernous rock carries the water on through caves and crevices and open joints far down to the valley below.
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HUGHES, T. Snow-drifts on Ingleborough in July. Nature 62, 389 (1900). https://doi.org/10.1038/062389a0
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DOI: https://doi.org/10.1038/062389a0
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