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Double-horned rhinoceros. Representative evidence-type visual; not the exact specimen.
OBJECT DOSSIER · SMITHSONIAN OPEN ACCESS

Double-horned rhinoceros — Menoceras arikarense

SAGE Museum Deep Time scientific dossier
Date / Period
Oligocene — early Arikareean · Oligocene in the Smithsonian catalog.
Object Type
composite
Medium
representative_scientific_visual
About This Object

Geologic period: Oligocene — early Arikareean

Age: Oligocene in the Smithsonian catalog.

Feeding: Herbivorous.

Evidence: Skeletons and skulls directly preserve rhinoceros anatomy. Behavior associated with the paired nasal horn structures remains inferred.

Why it matters: Menoceras shows that rhinoceroses were once far more diverse in size and skull form than the surviving species suggest.

Plain Language Identity: A relatively small early rhinoceros from the Oligocene of North America.

What You Are Looking At: A composite reconstruction of Menoceras arikarense.

Ecosystem: Oligocene terrestrial plains of North America.

Source Urls: https://naturalhistory.si.edu/visit/virtual-tour/current-exhibits/deep-time-virtual-tour-fossil-list; https://www.si.edu/object/nmnhpaleobiology_3342409

Formation: Harrison Formation, Arikaree Group

Find Location: Nebraska, United States

Enrichment Method: SAGE curated research pass; title + scientific name + source scene matched; chronology and taxonomy conflicts retained rather than silently corrected; evidence separated from inference

Scientific name: Menoceras arikarense

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

Why It Is In This SAGE Exhibit

Representative evidence-type visual; not the exact specimen.

After the Dinosaurs: Mammals, Ice Ages and the World We Inherited.

Provenance
Smithsonian Deep Time source scene: Costs and Benefits of Living Large
Exhibition History
Included in the SAGE Museum Dinosaurs & Deep Time staging exhibit.
Subjects & Themes
Menoceras arikarense Oligocene — early Arikareean composite Costs and Benefits of Living Large After the Dinosaurs
ORIGINAL COLLECTION SOURCE

This object page stays inside SAGE Museum. The Smithsonian link below is provided only as the original scholarly collection record. It opens separately.