Nature
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A three-toed dinosaur known as a Saurischia therapod made these tracks about 170 million years ago during the Jurassic era, when the environment here was tropical. The footprints are raised natural sandstone castings of the original tracks. After the dinosaur walked through sandy mud, its dried tracks were filled by more mud that eventually hardened into rock of the Kayenta formation. Later, the Kayenta layer tilted and spalled, revealing the castings as well as the molds whose slab was too massive to remove.
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Page, Arizona · United States
