For years, geologists in the Southwest have pondered a big question: Where did the Colorado River go before it carved the Grand Canyon?
Researchers knew the river flowed near Grand Junction, Colo., 11 million years ago, and that it exited the Grand Canyon about 5.6 million years ago. But where did it go in the interim?
A study published in the journal Science on April 16 proposes a possible answer.
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