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Authored On: 01/24/2014 - 14:09
Last Updated: 01/10/2018 - 17:54
… RSR's List of Not So Old Things … * Opals Form in Months,  Man's … bat - the tunnel stalagmites  at Tennessee's  Raccoon Mountain - hundreds of stalactites beneath the Lincoln … Geographic's Not-So-Old Hard-Rock Canyon at Mount St. Helens : As our List of Not So Old Things (this web page) …