On the Antiquity of the Caverns And Cavern Life of the Ohio Valley

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After being abandoned we sometimes find these caverns lastino- for an ex- tremely long time without change. The upper levels of the Mammoth Cave have doubtlessly remained substantially unchanged for tens of thousands of years. Stalactitic matter is kept from forming by the impervious roof, and by the small amount of limestone between the top of the cavern and the soil, which does not admit of the water becoming very much charged with lime in its passage to this level.
6 ANTIQUITY OF THE CAYEENS
... AND As the streams gather force they begin to use moving pebbles as teeth for their cutting work, and thus pass more rapidly from stage to stage. It may be in part to this that we owe the fact that the lower chambers in the series are quite generally smaller than the upper chambers. Most of the grand avenues known to me are on the upper level of the cavern work.
The most surprising features in the architecture of caverns are the great "domes" or wells, which often pass at one leap from the uppermost to the lowermost level of the caves.


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