Omnisaura
Demo

Dinosaur genus

Stokesosaurus

Madsen 1974

Stokesosaurus is a dinosaur genus known from bones, found in rocks 152.2–143.1 million years old, in the United States.

Confidence labels
How sure are we?0 high7 medium1 lowHow we rate confidence

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
152.2–143.1 Ma
Triassic
Jurassic
Cretaceous
252 million years ago20114366

Solid: the ages of its dated fossils, 152.2–143.1 million years ago (Omnisaura's calculation). Pale: the published range, 154.8–143.1 million years ago, which also counts records Omnisaura leaves out.

The last non-bird dinosaurs died out 66 million years ago. That's as far from us as the end of this bar.

Named by
Madsen 1974
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Described in
J. H. Madsen (1974). A new theropod dinosaur from the Upper Jurassic of Utah. Journal of Paleontology 48(1): 27–31.
mediummedium: Only PBDB gives this; its author and year match the naming authority (Madsen 1974).
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.

Type species
Stokesosaurus clevelandi
mediummedium: Only PBDB gives this; nothing contradicts it.
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Lived
Kimmeridgian to Tithonian, 154.8–143.1 million years ago
mediummedium: Only PBDB gives this; nothing contradicts it.
Omnisaura calculation152.2–143.1 million years ago, from its dated fossil records
lowlow: Omnisaura's calculation from only 2 dated record(s).
Sources

Given by: Paleobiology Database. How it was chosen: PBDB leads.

Fossils found in
United States
mediummedium: Only PBDB records it (2 records).
Sources

Given by: Paleobiology Database. How it was chosen: Union of all sources (ISO 3166).

Rock formations
Morrison Formation
mediummedium: Only PBDB records it (2 records).
Sources

Given by: Paleobiology Database. How it was chosen: Canonical names, automatic and editor-approved matches applied.

Parent group
Tyrannosauroidea
mediummedium: 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).

Sources: Paleobiology Database (CC BY 4.0), Natural History Museum Data Portal (CC0 1.0), Wikidata (CC0 1.0)Confidence levels and gaps are Omnisaura's own assessment.

Gaps are answers

What isn't known yet

  • Order: no source we use gives it yet.
  • Family: 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: 4 fossil records left out: identified only tentatively (for example "cf." or "?").
  • Resting on one source: 4 facts come from a single source with nothing against them (rated medium): authority (PBDB); type species (PBDB); parent group (PBDB); age (headline) (PBDB).

Size, diet and behaviour aren't covered yet. Omnisaura leaves them out rather than guess.

Where sources disagree

None open. Where our sources overlap, they agree on everything shown here.

Did it meet…?

?

No. Stokesosaurus had gone at least 59.5 million years before Tyrannosaurus appears in the fossil record.

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.

AllosaurusCamarasaurusStegosaurusDiplodocusApatosaurusCamptosaurusDryosaurusNanosaurusBrontosaurusBarosaurusCeratosaurusBrachiosaurusCoelurusTorvosaurusHaplocanthosaurusHesperosaurusand 18 more

Same parent group

Other genera in Tyrannosauroidea with a full profile.

AlectrosaurusAppalachiosaurusCalamosaurusDilongDryptosaurusKhankhuuluuTimimus

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.