It Took Eons to Make Grand Canyon GrandMarch 6th, 2008 By LAURAN NEERGAARD, Associated Press Writer in Earth / Earth Sciences
(AP) -- Gazing into the majestic Grand Canyon, awe-struck visitors inevitably ask: "How old is it?" Far older than generally thought, says new evidence that scientists culled from caves lining the canyon's red limestone cliffs.
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"It Took Eons to Make Grand Canyon Grand." March 6th, 2008. http://phys.org/news124041613.html