A Speleogen is a geological formation within a cave that has been created by the removal of bedrock, rather than as a secondary deposit. They are typically formed in limestone or dolostone solutional caves. The United States Code defines speleogens as `relief features on the walls, ceiling, and floor of any cave or lava tube which are part of the....
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http://en.wikipedia.org/wiki/Speleogen
A cave feature formed erosionally or by weathering in cave enlargement such as current marking scallops, rock pendants, canyons or spongework.
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http://www.cancaver.ca/docs/glossary.htm
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