Genus: Camarasaurus COPE, 1877
Etymology: Greek, kamara, “chamber”, and Greek, sauros, “lizard”: “Chamber lizard”.

Species: supremus COPE, 1877
Etymology: Latin, supremus, 'above, upper, high.'

Locality: Cope’s Quarry 8 (about 500 feet southwest of Cope’s Nipple), Garden Park, Canon City, Fremont County, Colorado.
Note: Cope also referred it to Camarasaurus Quarry 2 and Osborn and Mook 1921, incorrectly called it Cope Quarry 1.

Horizon: Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 4.

Age: Upper Part, Comobluffian age, Tithonian Stage, Uppermost Malm Epoch, Late Jurassic.


AMNH 5761: Maxilla, proximal end of dentary and posterior part of skull, cervicals 6, 8-9, 11, dorsal neural spine, fragmentary dorsal vertebra, dorsal vertebrae 1, 3-6, 8-10, sacrum, ilia, pubes, and ischia, caudal vertebrae 1-8, 10-11, 14-18, 19, 22-25, 28-30, 34, 39, 42-44, chevron 1-2, 4-7, 10, sternal plates, fragmentary ribs, ventral ribs (gastralia), 3 left and 2 right scapulae, left and right coracoids, humeri, left metacarpal I, II, right tibia, right fibula, astragalus, right metatarsal III.
Note: Cervicals 11 and 12 are fused together and are pathologic in nature.


Species: grandis (MARSH, 1877) GILMORE, 1925

Referred material:


Locality: East Camarasaurus Quarry, about 150 meters east of Bone Cabin Quarry, Albany County, northeast of Medicine Bow, Wyoming.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Stage?, Malm Epoch, Late Jurassic.


Gunma Museum of Natural History, GMNH 101 (Western Paleontological Laboratories, Inc, 1995): Approximately 65% complete skeleton, consisting the large part of an articulated skeleton, which is in many ways quite unusual. Preserved are the skull and mandible, cervical vertebrae 1-8, dorsal neural arches 6-12, most of the dorsal ribs, the articulated sacrum lacking centra, a nearly complete set of caudal vertebrae lacking only the centra of numbers 1 and 2, 18 chevrons, part of the right scapula, left coracoid, left humerus and fragments of the right, partial left ulna, partial left manus, right ilium, pubes, ischia and nearly complete right hind limb and pes, head of left femur and part of left pes.

Note: Caudals 25, 26, 32, 33, 39, 40, 43, 46, 47, and possibly 50-53, are pathologic. Metatarsal II has a stress fracture (ROTHSCHILD & MOLNAR, 2005)



Locality: Near Canon City, Colorado.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age:? Age? Stage? Upper Malm Epoch, Late Jurassic.


DMNH 2908: A nearly complete right humerus, associated dorsal vertebra and several caudal centra.
Note: The humerus shows a juxtacortial lesion pathology.


= Morosaurus lentus MARSH, 1899
= Camarasaurus lentus (MARSH, 1889)

Referred material:


Locality: BS-Quarry & S-Quarry, Warm Springs Ranch, approximately 7 km southeast of the town of Thermopolis, Hot Springs County, Wyoming.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

Age: Age? Just below the Tithonian-Kimmeridgian Stage Boundary, Malm Epoch, Late Jurassic.


WDC BS-263: 2 fused caudals.

Note: Pathologic?