Ancient Colorado river flowed backwards
Monday, October 4, 2010 - 11:32
in Earth & Climate
Geologists have found evidence that some 55 million years ago a river as big as the modern Colorado flowed through Arizona into Utah in the opposite direction from the present-day river. They have named this ancient northeastward-flowing river the California River, after its inferred source in the Mojave region of southern California.
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