Grand Canyon May Be 60 Million Years Older Than Thought

Aired: 11/30/2012 | 0:05:14 | Clip
A newly published study renews an old debate about the age of the Grand Canyon, positing a possibility that the geographical formation could be tens of millions of years older than current wisdom suggests, dating back to the time of dinosaurs. Margaret Warner talks to science correspondent Miles O'Brien about its significance.

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