It Took Eons to Make Grand Canyon Grand

March 6, 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 6, 2008