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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
Points where water enters an underground drainage route or aquifer. An obvious type of input point is a surface sink or swallow hole, where allogenic drainage has direct access to a conduit system within a carbonate aquifer. Less obvious are points where drainage enters a potential carbonate conduit-system from adjacent noncarbonate strata (such as a porous sandstone aquifer) or where water utilizes a fracture system to pass through otherwise relatively impermeable beds and into the carbonate aquifer .