Mammoth Cave in Mammoth National Park is part of the longest cave system in the world, and is a world heritage site.The caves have formed in thick deposits of carboniferous limestone, with a sandstone cap-rock. With over 630 km of passageways and cave, the National Park was established to help preserve and protect the cave system. New discoveries are adding distance to the cave system every year. The Geology of the caves has been put together really well in the documentary "Geology of Mammoth Cave, Kentucky", by University Students at Ohio State.
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