Rock formation · Cretaceous · United States, Canada
Two Medicine Formation
The Two Medicine Formation holds 10 genera from this site (9th of 26 formations), in 47 fossil records. Its dinosaur-bearing records date to the Campanian (83.6–72.1 Ma), with finds in Montana and Alberta.
Genera recorded here
Records in this formation, and the share of each genus's total records that come from it.
| Genus | Records here | Age | Group | Share of genus |
|---|---|---|---|---|
| Hypacrosaurus | 16 | 83.6–66 Ma | Ornithopods | 43% |
| Troodon | 9 | 83.6–66 Ma | Theropods | 9% |
| Daspletosaurus | 7 | 83.6–72.1 Ma | Theropods | 33% |
| Saurornitholestes | 4 | 83.6–66 Ma | Theropods | 3% |
| Prosaurolophus | 3 | 83.6–72.1 Ma | Ornithopods | 20% |
| Euoplocephalus | 2 | 83.6–72.1 Ma | Armoured & plated dinosaurs | 11% |
| Gryposaurus | 2 | 199.5–72.1 Ma | Ornithopods | 6% |
| Panoplosaurus | 2 | 83.6–66 Ma | Armoured & plated dinosaurs | 13% |
| Corythosaurus | 1 | 83.6–72.1 Ma | Ornithopods | 3% |
| Ornithomimus | 1 | 83.6–66 Ma | Theropods | 3% |
Age ranges of its genera
Overall stage range of each genus (all formations).
Where it crops out
Fossil records with coordinates.
Groups present
Ornithopods (4), theropods (4), armoured & plated dinosaurs (2).