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Question: What is the name of the site in Colorado that features the largest known set of dinosaur tracks in North America?

Answer: Picketwire Canyonlands, located on the Comanche National Grassland south of La Junta.

A 5.2-mile hike (10.4-miles roundtrip) takes you to the largest known set of dinosaur tracks in North America. Left by Brontosaurus and Allosaurus that walked along the muddy edge of what was once a large shallow lake, the tracks are said to be the first evidence of social behavior among Brontosaurs.