Genus · Tenontosauridae · Cretaceous
Tenontosaurus
Named by Ostrom 1970
Tenontosaurus lived 121.4–113.2 million years ago, during the Aptian stage of the Early Cretaceous. The Paleobiology Database lists 83 fossil records for it from 1 country (United States) — the 10th most of the 99 genera on this site.
Where it sits in time
Key facts from the records
- Most of what is known comes from one rock unit: 76% of its records are from the Cloverly Formation.
- Every record is from United States; Montana alone has 55 of them.
- Deinonychus appears in 29% of the collections that hold Tenontosaurus; Sauropelta in 9%.
- Its stage range spans about 8.2 million years (74th longest of 99); it is the 3rd best-recorded of the 21 ornithopods here.
2 accepted species
| Species | Named by | Records |
|---|---|---|
| Tenontosaurus tilletti | Ostrom 1970 | 53 |
| Tenontosaurus dossi | Winkler et al. 1997 | 1 |
Where it was found
83 records with coordinates.
Found alongside
Rock formations
States & provinces
| Region | Records | Share |
|---|---|---|
| Montana | 55 | 66% |
| Wyoming | 8 | 10% |
| Oklahoma | 6 | 7% |
| Texas | 5 | 6% |
| Utah | 4 | 5% |
| Arizona | 2 | 2% |
| Maryland | 2 | 2% |
| Idaho | 1 | 1% |
Records by stage
Well-dated records, by the stage of their mid-point age.
Depositional settings
Other ornithopods of its time
Same group, overlapping stage range, not found in the same collections.
| Genus | Age | Country | Records |
|---|---|---|---|
| Iguanodon | 139.8–113.2 Ma | United Kingdom, Spain | 133 |
| Gryposaurus | 199.5–72.1 Ma | Canada, United States | 31 |
| Mantellisaurus | 132.6–113.2 Ma | United Kingdom, Spain | 17 |
Also from these formations
Data: PBDB taxon 38741 · method