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Glossary of Karst and Cave Terms
Based on "A Lexicon of Cave and Karst Terminology with Special to Environmental Karst Hydrology" EPA/600/R-02/003, 2002, EPA: Washington, DC., Speleogenesis Glossary includes 2699 cave & karst terms
Erosion of an existing cave floor by a freely flowing stream to form a canyon passage that is commonly narrower than the original passage. Where the stream entrenches an originally tubular phreatic passage a characteristic keyhole shaped profile develops. Also known as vadose entrenchment or incision .