Karst Springs
From MicrobeWiki, the student-edited microbiology resource
Introduction
A Karst topography is formed when rock (often limestone) is dissolved, causing small fissures within the surface structure. This fissures channel water, leading to subsurface flow within cave-like structures. Karst springs are formed when water exits the subterranean matrix and forms surface pools.
Microbial Inhabitants
References
Picture reference: International Association of Hydrogeologists http://www.iah.org/karst/karst_hydrogeology.html