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New evidence suggests that the river that started carving the Grand Canyon once flowed north into Utah, until the south-flowing Colorado River captured it.

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Grand Canyon mystery

Geologists debate the age of the planet’s deepest canyon, with the answer to ancient riddles hanging in the balance

So I’m sitting on a river-smoothed swirl of Vishnu Schist in the bottom of the Grand Canyon trying to reset my imagination as the Colorado River roars past.

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