Sauropod dinosaur — Diplodocus hallorum

Geologic period: Late Jurassic — Tithonian

Age: Late Jurassic.

Feeding: Herbivorous.

Locomotion: Terrestrial quadruped.

Body plan: Extremely long neck and tail, relatively small skull and four weight-bearing limbs.

Evidence: Vertebrae and limb anatomy establish body proportions. Neck posture, feeding height and detailed behavior remain subjects of biomechanical interpretation.

Why it matters: Diplodocus illustrates one of the most extreme solutions to large herbivore body design: enormous overall length combined with a relatively small head.

Plain Language Identity: A giant long-necked diplodocid sauropod from the Late Jurassic Morrison Formation.

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

Ecosystem: Late Jurassic Morrison Formation.

Preservation: Composite skeletal mount.

Open Questions: Do not present one rigid neck posture as the only possible living posture.

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.