Visit the Grand Canyon, and signs will inform you that scientists believe it is about 6 million years old, which, a new study suggests, is a mere 64 million years or so off. A group of "contrarian" geologists published a paper today arguing that the canyon is about 70 million years old, meaning dinosaurs could have roamed its depths, the Washington Post reports. The finding is based on a technique called thermochronology, which studies tiny crystals for signs of elemental decay that would only occur near Earth's surface.
Lead author Rebecca Flowers of the University of Colorado believes the canyon was not, as conventional wisdom holds, carved by the Colorado River, but by two other ancient rivers; the Colorado just took advantage of the existent path. "We know it's going to be controversial," Flowers says. And she's right. "It is simply ludicrous," says one noted canyon geologist, who worries the theory will confuse canyon-goers. "To them, it seems like dinosaurs might have lived with humans (like the Flintstones)."