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That vertical shaft is these are formed by underground water dripping of flowing straight downward through the limestone along vertical cracks. uniformly distributed dissolution of the rock results in a silo- or well-shaped passage so that most of them appear roughly circular in cross section when viewed straight up and down. they form above active tubular passages although they may intersect a limited number of passages along their length. at mammoth cave, they range in size from 30 feet across to 200 feet from top to bottom [15]. synonym: dome-pit. see also canyon passage; fissure cave; keyhole passage; passage; tubular passage; vadose shaft; vertical cave.?

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