The Dinosaur Ridge in Morrison, Colorado, one of the world’s most famous dinosaur sites, was discovered in 1877 by Arthur Lakes, and Apatosaurus, Diplodocus, Stegosaurus, and Allosaurus were first identified. A stony incline, exposed in 1937, reveals hundreds of dinosaur footprints fossilized in the rock by Iguanodon-like herbivores and ostrich-sized carnivores about 100 million years ago, when the dinosaurs were migrating north and south along the shore of the ancient inland sea.
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