How Old is the Grand Canyon?

I want to refer you two two items, one older piece by me and another very new, fresh out of the box piece by Carl Zimmer. Not that I’m trying to compare Zimmer and me. But the two posts are somewhat complementary, yet very much on the same page.How to Date the Grand Canyon: Go With the FlowAbducted by Aliens … and dropped off at the Grand CanyonWell, you’ve got to admit they are both pretty attractive titles….

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