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
spring head alcove
The arcuate cliff surrounding many risings, formed by progressive headward sapping and cavern collapse. The rapidity of their formation is increased by the cliff-line which frequently exists already at the lower margin of the karst area .