Nature
13
The imprints were made by a one ton, twenty foot long, meat-eating dinosaur. The slab of sandstone came from a nearby side canyon. When Dilophosaurus tracked through the silt 170 million years ago, this was a different landscape. Shallow streams meandered across a marshy plain. Throughout Glen Canyon the red-orange layer of Kayenta sandstone appears, a lost world turned to stone, then river-cut and weathered into view.
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