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Authored On: 01/24/2014 - 14:09
Last Updated: 04/21/2018 - 11:23
… RSR's List of Not So Old Things … * Opals Form in Months,  Man's … form of a dead bat - the tunnel stalagmites  at Tennessee's  Raccoon Mountain - hundreds of stalactites beneath the … not so old! *  National Geographic's Not-So-Old Hard-Rock Canyon at Mount St. Helens : As our List of Not So Old Things …