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[–] ardvarcus ago 

“It’s likely quite young, geologically speaking,” MacGregor says. “It’s likely less than three million years old and possibly as young as 12,000 to 15,000 years old.”

That's quite the span of time you got there, scientists. No reason to suppose the impact was 12,000 years ago, other than that it would support some theories a few flakes have about ancient civilizations.