vertical shaft

   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.

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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