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Grand Canyon - older still?

Started 5 months ago | Discussion thread
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brettmeikle
brettmeikle
Senior Member • Posts: 1,765
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Grand Canyon - older still?
5 months ago

6 million years or 70 million?  Or 6,000

Anyway, an interesting article  about a paper published in Science that suggests an older canyon.

--
Brett Meikle
http://brettmeiklephoto.smugmug.com/

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