Genus · Dome-headed dinosaurs · Cretaceous
Pachycephalosaurus
Named by Brown and Schlaikjer 1943
Pachycephalosaurus lived 72.1–66 million years ago, during the Maastrichtian stage of the Late Cretaceous. The Paleobiology Database lists 34 fossil records for it from 2 countries (United States and Canada) — the 34th 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 6 formations; the largest share, 56%, is from the Hell Creek Formation.
- Triceratops appears in 22% of the collections that hold Pachycephalosaurus; Tyrannosaurus in 22%.
- Its stage range spans about 6.1 million years (83rd longest of 99); it is the 2nd best-recorded of the 2 dome-headed dinosaurs here.
1 accepted species
Pachycephalosaurus has a single accepted species in PBDB.
| Species | Named by | Records |
|---|---|---|
| Pachycephalosaurus wyomingensis | Gilmore 1931 | 26 |
Where it was found
34 records with coordinates.
Found alongside
Rock formations
States & provinces
| Region | Records | Share |
|---|---|---|
| Montana | 16 | 47% |
| Wyoming | 9 | 26% |
| South Dakota | 5 | 15% |
| Alberta | 2 | 6% |
| North Dakota | 1 | 3% |
| Colorado | 1 | 3% |
| Country | Records | Share |
|---|---|---|
| United States | 32 | 94% |
| Canada | 2 | 6% |
Records by stage
Well-dated records, by the stage of their mid-point age.
Depositional settings
Also from these formations
Data: PBDB taxon 38786 · method