Large collapse chambers within caves
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In the karsts of China and Mulu (Sarawak) large chambers and tiankengs are associated with much smaller cave passages. They have developed mainly on fracture zones, some within the phreas, where rock collapse is not associated only with vadose drainage.
Collapse, Fracture, Chamber, Aven, Tiankeng
Speleogenesis and Evolution of Karst Aquifers, Vol. 4, no. 9 (2006).
Eavis, Andy, "Large collapse chambers within caves" (2006). KIP Articles. 3087.