30 Nov '12, 5pm

Grand Canyon May Be 65 Million Years Older Than Thought

Grand Canyon May Be 65 Million Years Older Than Thought

Certainly not a current environmental question, but a supremely interesting one nevertheless, is the age of the Grand Canyon and what shaped it. Conventional thinking is that it was shaped by the Colorado River some 5-6 million years ago. But a new study led by researchers from the University of Colorado Boulder, published in Science , contends that the Grand Canyon is far, far older than that, and was carved by another river entirely, and running in the opposite direction to the water currently coursing through the canyon. CU assistant professor Rebecca Flowers says, "Our research implies that the Grand Canyon was directly carved, to within a few hundred meters of its modern depth, by about 70 million years ago." The conventional dating of the Grand Canyon is derived from the age of gravel washed downstream by the Colorado River. But the certainty of that 5-6 million year...

Full article: http://www.treehugger.com/natural-sciences/grand-canyon-m...

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