The fossil site known as the Cleveland-Lloyd Dinosaur Quarry in Emery County, Utah was known in 1927, but major operations did not begin there until 1960. An effort from nearly 40 institutions got thousands of bones between 1960 and 1965. The quarry is notable for the many "Allosaurus" remains, the condition of the specimens, and our ignorance of its ancient origin. It is estimated that the remains of at least 46 "A. fragilis" have been found there, out of at least 73 dinosaurs. The fossils found there are disarticulated (separate) and well-mixed.