The Cleveland-Lloyd Dinosaur Quarry is not only unique in dinosaur-packed Utah, it is also unique in the world. This fossil deposit, the largest concentration of Jurassic Era fossils in the world, was first discovered by scientists from the University of Utah in 1929. The most interesting and puzzling thing about the quarry is that the vast majority of bones (over 75%!) are from carnivores, and the majority are of one species: the allosaurus. Most of what we know about this particular dinosaur comes from the discoveries made here. In 1966 it became a National Natural Landmark, and it is managed by the BLM.
For anyone visiting the incredible San Rafael Swell, the Cleveland-Lloyd Quarry is both a quick side trip and a must-see unique experience. The site is quite small in area, but it is very interesting and even scenic. There is a small but nice visitor center, restrooms, and a picnic area. In addition to these, visitors are also treated to a view of a portion of the actual quarry, which is now in a covered building. Dinosaur bones are still clearly visible in the rock of the quarry!
There are three short hiking trails (Rock Walk, Raptor Point, and Rim Walk) that help visitors get a feel for the geology and natural history of the area. The longest of these is the Rim Walk, which is a 2-mile out-and-back trail.
The interesting history more than makes up for the lack of hiking, and this area is great for a side trip or day excursion if you are enjoying the north San Rafael Swell. It is also an especially kid-friendly destination that families will enjoy. The area is open daily from 10 a.m. to 5 p.m. from the end of May to the beginning of September. Otherwise it it open Thursday through Saturday from 10 a.m. to 5 p.m.