- An underground chamber containing notable quantities of collapsed material. The term is commonly abused in describing the origin of cave chambers floored by collapse debris. Though wall and roof collapse are common modifying processes in larger chambers, it is important to remember that such collapse cannot form a chamber, as it can only take place into a preexisting cavity .
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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