Genus · Hadrosauridae · Cretaceous
Edmontosaurus
Named by Lambe 1917
Edmontosaurus lived 72.1–66 million years ago, during the Maastrichtian stage of the Late Cretaceous. The Paleobiology Database lists 85 fossil records for it from 2 countries (United States and Canada) — the 8th 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, 39%, is from the Hell Creek Formation.
- Triceratops appears in 31% of the collections that hold Edmontosaurus; Tyrannosaurus in 13%.
- Its stage range spans about 6.1 million years (83rd longest of 99); it is the 2nd best-recorded of the 21 ornithopods here.
2 accepted species
| Species | Named by | Records |
|---|---|---|
| Edmontosaurus annectens | Marsh 1892 | 30 |
| Edmontosaurus regalis | Lambe 1917 | 10 |
Where it was found
85 records with coordinates.
Found alongside
Rock formations
States & provinces
| Region | Records | Share |
|---|---|---|
| Montana | 25 | 29% |
| Wyoming | 25 | 29% |
| Alberta | 17 | 20% |
| South Dakota | 8 | 9% |
| North Dakota | 3 | 4% |
| Saskatchewan | 2 | 2% |
| Colorado | 2 | 2% |
| Alaska | 2 | 2% |
| Country | Records | Share |
|---|---|---|
| United States | 66 | 78% |
| Canada | 19 | 22% |
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 |
|---|---|---|---|
| Zalmoxes | 83.6–66 Ma | Romania, Austria | 44 |
| Saurolophus | 72.1–66 Ma | Mongolia, Canada | 38 |
| Hypacrosaurus | 83.6–66 Ma | Canada, United States | 37 |
| Rhabdodon | 83.6–66 Ma | France, Spain | 37 |
| Telmatosaurus | 72.1–66 Ma | Romania, France | 23 |
Also from these formations
Data: PBDB taxon 38761 · method