Dinosaur National Monument stretches along the southeast portion of the Uintas Mountains and over the Utah and Colorado border, with most being in the latter. The monument's visitor center is located seven miles north of Jensen, Utah. Nearby is the famous Carnegie Quarry Exhibit Hall, which is a large room that protects a rock wall containing numerous dinosaur fossils such as Allosaurus, Apatosaurus, Camarasaurus, Diplodicus, and Stegosaurus. The dinosaurs date back to the Jurassic Period. The monument also features 10,000 years of human habitation. Petroglyphs and pictographs are scattered throughout the park, numbering up to 800 sites.
Fossils were first discovered here in 1909 by a paleontologist of the Carnegie Museum of Natural History. The park was designated a National Monument in 1915 expanded from 80 acres to 200,000 in 1938.