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• 2008-04-08 22:23 Tillman 800×600× (149382 bytes) USGS, [[Carlsbad Caverns National Park]] http://3dparks.wr.usgs.gov/carlsbad/html2/cc21.htm Flowstone is a form of speleothem that forms where calcium-carbonate-rich water trickles down the walls of a cavern. Over time travertine accumulates in unusual