UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

Very small dissolutional channels, commonly 1-3mm across; parallel, convergent or randomly intersecting on a limestone surface. Though found in all climatic regions they are most conspicuous in semi-arid and periglacial environments, where dissolutional processes are minimal and very slow. The random patterns of some microkarren may be due to the effects of condensation water [9].