Genus · Ceratopsidae · Cretaceous
Triceratops
Named by Marsh 1889
Triceratops lived 72.1–66 million years ago, during the Maastrichtian stage of the Late Cretaceous. The Paleobiology Database lists 166 fossil records for it from 2 countries (United States and Canada) — the most of the 99 genera on this site.
Where it sits in time
Key facts from the records
- Its records are spread over at least 10 formations; the largest share, 41%, is from the Lance Formation.
- Edmontosaurus appears in 17% of the collections that hold Triceratops; Tyrannosaurus in 15%.
- Its stage range spans about 6.1 million years (83rd longest of 99); it is the best-recorded of the 11 horned dinosaurs here.
4 accepted species
| Species | Named by | Records |
|---|---|---|
| Triceratops horridus | Marsh 1889 | 41 |
| Triceratops prorsus | Marsh 1890 | 17 |
| Ojoceratops fowleri | Sullivan and Lucas 2010 | 6 |
| Tatankaceratops sacrisonorum | Ott and Larson 2010 | 1 |
Where it was found
166 records with coordinates.
Found alongside
Rock formations
States & provinces
| Region | Records | Share |
|---|---|---|
| Wyoming | 64 | 39% |
| Montana | 45 | 27% |
| South Dakota | 20 | 12% |
| Saskatchewan | 14 | 8% |
| North Dakota | 7 | 4% |
| New Mexico | 7 | 4% |
| Colorado | 5 | 3% |
| Alberta | 3 | 2% |
| Country | Records | Share |
|---|---|---|
| United States | 149 | 90% |
| Canada | 17 | 10% |
Records by stage
Well-dated records, by the stage of their mid-point age.
Depositional settings
Other horned dinosaurs of its time
Same group, overlapping stage range, not found in the same collections.
| Genus | Age | Country | Records |
|---|---|---|---|
| Pachyrhinosaurus | 83.6–66 Ma | Canada, United States | 16 |
| Torosaurus | 72.1–66 Ma | United States, Canada | 12 |
Also from these formations
Data: PBDB taxon 38862 · method