Grand Canyon'a age raised: ; Western wall of gorge is 17 million years old,; not 6 million, study says

From: Charleston Gazette | Date: March 7, 2008| Author: | Copyright information

WASHINGTON - 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.

The Grand Canyon often is referred to as about 6 million years old - but its western half actually began to open at least 17 million years ago, a University of New Mexico team reports Friday in the journal Science.

Wait: The western side of the canyon is the downstream end of the Colorado River, so how could it be older than the arguably more spectacular eastern ...

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