Dinosaur genus
Ornithomimus
Ornithomimus is a dinosaur genus known from bones, found in rocks 83.6–66 million years old, in the United States and Canada.
Confidence labels are switched off. Facts with low confidence, or where sources disagree, still carry a small dot: tap it for the reason.
At a glance
Data as of 12 October 2026- Named by
- Marsh 1890
high
high: PBDB and Wikidata agree.Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
- Described in
- O. C. Marsh (1890). Description of new dinosaurian reptiles. The American Journal of Science, series 3 39: 81–86. Read it
high
high: PBDB gives this publication for the name; its author and year match the naming authority (Marsh 1890), on which PBDB and Wikidata agree.Sources
Given by: Paleobiology Database. The publication the Paleobiology Database gives as the authority for this genus name, usually the one that first named and described it.
- Lived
- Campanian to Maastrichtian, 83.6–66 million years ago
high
high: PBDB and NHM agree.Omnisaura calculation83.6–66 million years ago, from its dated fossil recordsmedium
medium: Omnisaura's calculation from 27 confirmed PBDB records.Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
- Fossils found in
- CanadaUnited States
high
high: NHM and PBDB both record it.high
high: NHM and PBDB both record it.Sources
Given by: Paleobiology Database; Natural History Museum Data Portal. How it was chosen: Union of all sources (ISO 3166).
- Rock formations
- 15, including Lance Formation, Horseshoe Canyon, Dinosaur Park and Denver
mixed
mixed: Levels differ between entries; each has its own.Show all 15, each with its confidence
DenverDinosaur Parkmedium
medium: Only PBDB records it (2 records).Hell Creek Formationmedium
medium: Only PBDB records it (3 records).Horseshoe Canyonmedium
medium: Only PBDB records it (2 records).Lance Formationmedium
medium: Only PBDB records it (5 records).Agujamedium
medium: Only PBDB records it (6 records).Belly River Serieslow
low: Only one PBDB record.Frenchmandisputed
low: Only NHM gives this name and it matches no PBDB formation; awaiting an editor.Fruitlandlow
low: Only one PBDB record.Judith River Formationlow
low: Only one PBDB record.Kaiparowitslow
low: Only one PBDB record.Laramie Formationlow
low: Only one PBDB record.Scollarddisputed
low: Only NHM gives this name and it matches no PBDB formation; awaiting an editor.Tar Heellow
low: Only one PBDB record.Two Medicinelow
low: Only one PBDB record.low
low: Only one PBDB record.Sources
Given by: Paleobiology Database; Natural History Museum Data Portal. How it was chosen: Canonical names, automatic and editor-approved matches applied.
- Family
- Ornithomimidae
medium
medium: Only PBDB gives this; nothing contradicts it.Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
- Parent group
- Ornithomimidae
medium
medium: Only PBDB gives this; nothing contradicts it.Sources
Given by: Paleobiology Database. How it was chosen: PBDB leads.
- Known from
- Bones
Sources
Given by: Paleobiology Database (what the name was based on).
Gaps are answers
What isn't known yet
- Type species: no source we use gives it yet.
- Order: no source we use gives it yet.
- Common names: no source we use gives it yet.
- What it was named after: no source we use gives it yet.
- Held back: 8 fossil records left out: identified only tentatively (for example "cf." or "?").
- Resting on one source: 2 facts come from a single source with nothing against them (rated medium): parent group (PBDB); family (PBDB).
Size, diet and behaviour aren't covered yet. Omnisaura leaves them out rather than guess.
Where sources disagree
2 openFormations
- NonePBDB
- Belly River SeriesNHM
One source names a formation the other does not. An editor hasn't ruled yet, so this is rated low until they do.
Formations
- NonePBDB
- Laramie FormationNHM
One source names a formation the other does not. An editor hasn't ruled yet, so this is rated low until they do.
Did it meet…?
Yes. Both are found, identified to species, in the same rocks of the same age: Denver, Dinosaur Park, Lance.
Going by the ages and rock formations of their dated fossils, as on the map. Compare their fossil sites on the map.
Lived alongside
Genera found in the same rock formations, from rocks of the same age.
Same family
Other genera in Ornithomimidae with a full profile.
Credits
Where this page comes from
- Paleobiology DatabaseCC BY 4.0 · fossil records, ages, classification
- Natural History Museum Data PortalCC0 1.0 · catalogued specimens
- WikidataCC0 1.0 · names and identifiers
- OmnisauraOmnisaura editorial · confidence levels and gaps
- PaleoMAP PaleoCoastlines (Kocsis and Scotese 2021)CC BY 4.0 · ancient coastlines on the small map
- Natural EarthPublic domain · today's coastlines
Pictures linked from this page are credited beside each one, with their own licences; the full list is in the JSON download.