To the untrained eye, the Grand Canyon might just look like one big hole in the ground. But to some scientists, the American Southwest's iconic gorge is increasingly looking like several ancient canyons of different ages, stitched together by erosion that occurred about six million years ago, and subsequently sculpted into its modern form.
A new study published in the journal Nature Geoscience, added to more than a century's worth of fieldwork, is helping researchers decipher a geological tale that began unfolding when dinosaurs roamed the landscape.
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