Genus: Brachiosaurus RIGGS, 1903
Etymology: Greek, brachon, “arm” and Greek, sauros, lizard: “Arm lizard”.
= Brachyosaurus LANGSTON, 1974 (sic)
= Branchiosaurus YADAGIRI, 1988 (sic)

Species: altithorax RIGGS, 1903
Etymology: Latin, altithronus, ‘one enthroned on high, seated in heaven’, and Latin, thorax, ‘corselet, breastplate’; in reference to how high the chest was in this animal from the ground.
= Brachiosaurus (Brachiosaurus) altithorax (RIGGS, 1903) PAUL, 1988
= Astrodon (Brachiosaurus) altithorax (RIGGS, 1903) KINGMAN, 1962
= Brachiosaurus altus JENSEN, 1986 (sic)

Holotype: FMNH P 25107

Locality: Rigg’s Quarry 13 (Riggs Hill, Field Museum Quarry), Grand Junction, Mesa County, Colorado.

Horizon: Lower Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Lowest zone 3.

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

Material: Sacrum, 7 dorsal and 2 anterior caudal vertebrae, right humerus, coracoid, ilium, and femur and a number of ribs.

Referred material:


Locality: Reed's YPM Quarry 13, T22N, R76W, Sec. 4 or 5, Como Bluff, East (East of Marshall road), Albany County, Wyoming.

Horizon: Salt Wash Member, Morrison Formation.

Biostratigraphy: Zone 2.

Age: Comobluffian age, Kimmeridgian Stage, Uppermost Malm Epoch, Late Jurassic.


YPM 1911: Premaxillae, maxillae, lachrymals, vomers, dentaries, loose teeth and some fragments.

Note: A large incomplete Camarasaurus-like skull and dentary. This is the skull Marsh used for his first reconstruction of Brontosaurus.


HOLT, 1990

Locality: Near the old Field Museum quarry.


Number: Not given: 32 caudal vertebrae, tibia and fibula.

Note: Probably belongs to type.


= Diplodocidae incertae sedis SCHWARZ, IKEJIRI, BREITHAUPT, SANDER & KLEIN, 2007 (moved to this genus by CARBALLIDO, MARPMANN, SCHWARZ-WINGS & PABST, 2012)

Locality: Howe Stephens Quarry, Big Horn County, Wyoming.

Horizon: Member?, Lower Morrison Formation.

Biostratigraphy: Zone?

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.


SMA 0009: Nearly complete skeleton, mid-cervical to mid caudal and nearly all the bones in between, of a juvenile.