The Grand Canyon often is referred to as about 6 million years old — but its western half actually began to open at least 17 million years ago, a University of New Mexico team reports Friday in the journal Science.
Wait: The western side of the canyon is the downstream end of the Colorado River, so how could it be older than the arguably more spectacular eastern side?
Read more.
Wait: The western side of the canyon is the downstream end of the Colorado River, so how could it be older than the arguably more spectacular eastern side?
Read more.
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