Genus: Brontosaurus MARSH, 1879
Etymology: Greek, bronte, “thunder”, and Greek, sauros, “lizard”: “thunder lizard”.

Species: louisae (HOLLAND, 1915)

Holotype: CM 3018 (DNM 1 and 25)

Locality: Quarry face as exposed inside the Dinosaur National Monument Visitor Center, Carnegie Quarry, Vernal, Uintah County, Utah.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

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

Material: 1-15 cervicals, dorsals 1-10, 1-5 sacrals, 1-64 caudals, 18 ribs, chevrons 1-3, scapulae, coracoid, humeri, left radius, ulna and manus, ilia, pubes, ischia, right femur, tibia and fibula, left pes.

Note: Caudal vertebrae 22 and 23 are coossified/pathologic.


RIGGS, 1903

Locality: Grand River Valley, near Fruita, Mesa County, Colorado.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

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


FMNH 7163: 11 dorsal vertebrae, 5 sacral, 23 caudal vertebrae, pelvis, ribs, and femur.
Note: Paleopathology, broken and rehealed ribs (5 and 6).