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Paleokarsts in Iowa

Posted on March 24th, 2015

Paleokarsts in Iowa by Robert M. McKay Following heavy rain, a muddy torrent of water laden with dislodged soil, twigs and leaves rushes down a gully and spills over a lip of rock, disappearing into a dark echoing hole. Crashing to the bottom of the pit, the flow continues outward and downward along narrow passageways […]