The Ancient Native American Found 2.5 Miles Inside Mammoth Cave — And The Mystery Of Why His People Went So Deep Underground
As the Green River cut its valley progressively deeper into the surrounding hills over the past several million years, it lowered the regional water table.
Water that had been filling cave passages at one level drained away, leaving those passages dry, and began the same dissolution process at a lower level.
This is how the five distinct levels of Mammoth Cave formed — each level representing a period when the water table was at a particular height, and the passages at that level were active waterways.
The upper levels, where the ancient miners worked, are the oldest.
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