Cleveland-Lloyd Dinosaur Quarry

Cleveland-Lloyd Dinosaur Quarry

1976 ExcavationThis dinosaur quarry is located at the north end of the San Rafael Swell, about 30 miles south of Price, Utah, in the heart of Dinosaur Country. The site was discovered in 1929 by the University of Utah, which excavated the site for three years. Later excavations were conducted by Princeton University (1939-1941), then by the University of Utah Cooperative Dinosaur Program (1960-1964), the Antiquities Section of the Utah Division of State History (1975-1980), Brigham Young University 1987-1990), and the Natural History Museum of Utah (2001-2002).

Our specimens of Cleveland-Lloyd dinosaurs were purchased through the University of Utah Cooperative Dinosaur Program.

1976 Quarry MapThe site is among the more important dinosaur sites in the world because of the large number of Allosaurus specimens found there.

These include juveniles that might have been around 6 feet long, to large adults close to 30 feet long. Why so many Allosaurus have been found there is a mystery. Various suggestions include 1) concentration of animals at a drying water hole; 2) animals becoming mired in a muddy bog formed either in an oxbow lake or fed by a spring; 3) transport of bones into a depression by a flood.

The Quarry occurs in the Brushy Basin Member of the Morrison Formation. A potassium-argon radiometric date of rock collected near the quarry has an age of 152 million years, which is Late Jurassic.

Cleveland-Lloyd Dinosaur Quarry Finds

This internationally famous dinosaur quarry is known for the large numbers of the meat-eating dinosaur bones excavated there. Other dinosaurs are also represented, but these are not as common.

List of the dinosaurs excavated and the number of individuals.

Theropods (meat-eaters)

Allosaurus (46)
Ceratosaurus (1)
Torvosaurus (1)
Marshosaurus (2)
Stokesosaurus (2)
Tanycolagreus (1)
Torvosaurus (1)

Sauropods (long-necked dinosaurs)

Camarasaurus (5)
Barosaurus (1)

Stegosaurus (plated dinosaur)

Stegosaurus (5)

Ornithopod (bipedal plant-eater)

Camptosaurus (5)

Other Animals

Goniopholis (crocodile) (1)
Blyptops (freshwater turtle) (1)

*On display at the museum.

Cleveland-Lloyd Quarry map

Portion of a quarry map showing the high density of bones that made the site so world famous. Seen here are the large bones of a sauropod and smaller bones of Allosaurus.

 


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