an unidentified apatosaurine, an unidentified diplodocine, Stegosaurus, Camptosaurus, Allosaurus, Ceratosaurus, Stokesosaurus, Marshosaurus, and Torvosaurus. At Carnegie Quarry, it has been found to coexist with Apatosaurus louisae, Diplodocus hallorum, Barosaurus, Stegosaurus, Dryosaurus elderae, Camptosaurus aphanoecetes, Allosaurus, Ceratosaurus, Torvosaurus, and Marshosaurus. Possible Haplocanthosaurus bones have been reported from Carnegie Quarry as well. The WDC specimens of C. lentus, the geologically youngest known of the species, were found at the same site as the apatosaurine skeleton NSMT-PV 20375, which may represent an as-yet unnamed genus and species of sauropod. C. lentus may be descended from the earlier species C. grandis, and the later species C. supremus may be a descendant of C. lentus. C. supremus first appears in the fossil record shortly before C. lentus disappears. References Works cited Late Jurassic dinosaurs of North America Macronarians Dinosaurs of the Morrison Formation Fossil taxa described in 1889 Taxa named by Othniel Charles Marsh Paleontology in Colorado Paleontology in Utah Paleontology in Wyoming