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Spanish for "natural wonder of the American West"
Jurassic National Monument, at the site of the Cleveland-Lloyd Dinosaur Quarry, is one of the world's foremost dinosaur fossil sources. More than 12,000 individual bones and one dinosaur egg have come from this prolific fossil bed. It is likely that many "complete skeletons" have been recovered, although it is impossible to state that with certainty because the bones are in a disarticulated state.
This is a working quarry where scientists conduct on-going research. There is a large visitor center featuring many exhibits. Visitor facilities are open April through October, Thursday thru Saturday from 10am to 5pm. They close for the season at the end of October and reopen in early April. Read more...
Today, at the Visitor Center you can see a complete Allosaur skeletal reconstruction and a Stegosaur wall mount. Recognized worldwide as the primary source of fossilized bones from the flesh-eating Allosaur, the quarry was designated a National Natural Landmark in 1966.
University of Utah scientists began studies in 1929. Princeton University did extensive work, financed by Malcolm Lloyd, in 1939-41 to obtain a museum exhibit. Because of the proximity to Cleveland, Utah, it became known as the Cleveland-Lloyd Quarry.
In 1960 the University of Utah commenced a 5-year project with several cooperating schools and museums including Brigham Young University and the College of Eastern Utah. Dr. William Lee Stokes was in charge of this ambitious project with assistance from James H. Madsen, Jr. In 2001, the University of Utah resumed investigations into the deposit. The focus this time around is more on trying to figure out what happened to produce such a magnificent collection rather than on just collecting more museum specimens.
Over the years, bones have been taken from the quarry representing at least 70 different animals and 11 species. Cast and original skeletons assembled from these bones are on display in over 60 museums worldwide, including the College of Eastern Utah Prehistoric Museum in Price.
Many theories have been proposed over the years to explain this mysterious deposit. Everything from river deposit to lake deposit to swampy bog to something involving earthquakes has been brought forward and dismissed by serious scientists. The latest theory produced by the U of U's recent work invokes a scenario of a watering hole in a drought-stricken land. While very promising, this theory too, has a few holes in it that may mean it isn't what really happened. But whatever did happen, the bones are there and have been for 147 million years. Covered by terrestrial deposits such as floodplain material, river channel, lake deposits, and volcanic ash for the next 50 million years, an interior seaway covered the area and added the weight of its marine mud for another 20 million years. More terrestrial deposits were added for the next 40 million years until finally erosion took over and started to remove all the covering rock.
The bones are now close enough to the surface to be recovered by scientific excavations. Two-thirds of the bones uncovered are from Allosaurus, one of the largest carnivore of the Jurassic period. Also present are plant-eating Stegosaurus, Camarasaurus and Camptosaurus. In the mid 1970's James H. Madsen Jr. described two previously unknown dinosaurs from bones discovered here. These small carnivores were known as Stokesosaurus clevelandi and Marshosaurus bicentesimus.
The quarry is located 30 miles south of Price, Utah, at the end of a graded road. Look for the "dinosaur" signs at road intersections. Room-size boulders scattered about the area create a unique setting for the exhibit buildings, picnic facilities, and the self-guided Rock Walk Nature Trail. The quarry is open March 25 - October 31. Operating hours are 10am - 5pm, Thursday - Sunday. For additional information, call the BLM office in Price, Utah at (435) 636-3600.
This is one of the federal government's "Fee Demonstration Project" sites. There is an entrance fee of $5 per adult. Anyone under 16 gets in free. All of the funds collected stay right at the site and are used for operations and improvements.
Please remember, fossilized bones of dinosaurs and other vertebrate animals contain valuable information from the past. When fossils are removed or damaged in any way, much of what they can tell us is lost forever.
We each have a responsibility to help preserve historically significant sites. Dinosaur bones are a rare and non-renewable resource. Anyone discovering these fossils should report their find to the nearest BLM office, or to the Utah Division of State History.
Cleveland-Lloyd Dinosaur Quarry was designated as a National Natural Landmark in 1966 and is protected under the Historic Sites Act of 1935. Please do not collect fossils, rocks, plants, or animals.
Please contact the following BLM office for more detailed information prior to visiting the area:
Price Field Office
125 S. 600 W.
Price, Utah 84501
751 E 100 N
Price, Utah 84501