Grand Canyon's 55-million-year-old secret
An ancient river may have laid the canyon's foundation.New dating of the canyon's Upper Granite Gorge suggests that this older, 1,000-metre-deep gorge may have been a rough template for the eastern third of the Grand Canyon.
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1 comments:
You began the Blog by saying "ancient" Of cores that word applies to where i am living.Just a thought of cores.
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