About Jurassic National Monument

Jurassic National Monument was designated by the John D. Dingell, Jr. Conservation, Management and Recreation Act, signed on March 12, 2019, expanding the Cleveland-Lloyd Dinosaur Quarry visitor center to an 850-acre national monument. The Monument, located near Cleveland, Utah, in the San Rafael Swell, is well known for containing the densest concentration of Jurassic dinosaur fossils ever found.

Over 12,000 bones belonging to at least 74 individual dinosaurs have been excavated at the quarry. The Monument has offered paleontologists an enormous of information about the Jurassic period--and yet the site has perhaps generated as many questions as it has answers.

Curiously, more than 75% of the bones come from carnivores, primarily Allosaurus fragilis. With more than 46 individual specimens of Allosaurus, scientists have been able to deduce much about how Allosaurus aged and compare individuals to better understand intraspecies diversity. However, the sheer density of bones raises many questions. How did the carcasses of so many animals end up in one place, and why are most of them meat-eaters? Many hypotheses have been presented, but no consensus has been reached in the scientific community and the debate is ongoing.