Sauropod dinosaur — Diplodocus hallorum

Geologic period: Late Jurassic — Tithonian

Age: Late Jurassic.

Feeding: Herbivorous.

Locomotion: Terrestrial quadruped.

Body plan: Long neck, exceptionally long tail, small skull and four columnar limbs.

Evidence: Skeletal proportions are direct. Physiology, metabolic demands and detailed feeding behavior require scientific modeling.

Why it matters: This second Diplodocus record serves a different visitor story: the engineering problems created by giant body size.

Plain Language Identity: A Late Jurassic diplodocid sauropod displayed in the museum's large-body and climate interpretation area.

What You Are Looking At: A composite skeletal mount of Diplodocus hallorum.

Formation: Morrison Formation — Salt Wash Member for documented Smithsonian material.

Find Location: Utah, United States.

Preservation: Composite skeletal mount.

Room Context Note: This is a separate visitor-context record from the other Diplodocus hallorum entry. They must not overwrite each other.

Open Questions: Body-size physiology should be presented as evidence-based modeling rather than direct fossil observation.

Source Urls: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list; https://www.si.edu/object/diplodocus-hallorum-gillette-1991:nmnhpaleobiology_3449133

Enrichment Method: SAGE curated research pass; title + scientific name + source scene matched; historic taxonomy retained where relevant; evidence separated from inference

Scientific name: Diplodocus hallorum

Evidence / representation: Representative evidence-type visual; not the exact specimen.

Representative evidence-type visual; not the exact specimen.

Jurassic Giants: Size, Teeth, Armor and Survival.