relict cave

relict cave
   Abandoned, inactive cave segment, left when the water that formed it is diverted elsewhere, normally due to rejuvenation, continuing cave development and increasing karstic maturity. Relict unmodified phreatic passage segments are abandoned in the vadose zone, where they may remain dry, retaining a typical phreatic morphology, or be invaded and modified to a keyhole profile by new streams. Ages of relict caves vary greatly and due to lack of stream-flow breakdown and speleothem deposition may become the dominant processes. Relict caves are commonly referred to incorrectly as fossil caves [9].

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

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