A femur (thigh bone) of the early dinosaur Chindesaurus, discovered at Petrified Forest National Park. The Jurassic (201 to 145 Ma) record of dinosaurs in the NPS is largely confined to the Colorado Plateau and Yellowstone area.
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No, Yellowstone is not based on any real events or people that exist in real life. However, the creator of the show explained that the issues that are explored in the show are inspired by problems that exist in western mountain states in the US.