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Wednesday, November 11, 2009 |
Wednesday, November 11, 2009 |
Photo: Grand Canyon Gorge Is 9 Times Older Than ThoughtA new study suggests that the canyon's Upper Granite Gorge formed 55 million years ago, suggesting that the Grand Canyon we see today may be the result of "ancestral" canyons that slowly grew together. Photograph by W. E. Garrett/NGS
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