Rock formation · Cretaceous · United States, Canada
Judith River Formation
The Judith River Formation holds 19 genera from this site (2nd of 26 formations), in 65 fossil records. Its dinosaur-bearing records date to the Campanian (83.6–72.1 Ma), with finds in Montana and Saskatchewan.
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 |
|---|---|---|---|---|
| Stegoceras | 15 | 83.6–72.1 Ma | Dome-headed dinosaurs | 33% |
| Troodon | 12 | 83.6–66 Ma | Theropods | 12% |
| Saurornitholestes | 7 | 83.6–66 Ma | Theropods | 5% |
| Dromaeosaurus | 4 | 83.6–66 Ma | Theropods | 8% |
| Albertosaurus | 3 | 83.6–66 Ma | Theropods | 9% |
| Edmontonia | 3 | 83.6–66 Ma | Armoured & plated dinosaurs | 19% |
| Euoplocephalus | 3 | 83.6–72.1 Ma | Armoured & plated dinosaurs | 17% |
| Monoclonius | 3 | 83.6–72.1 Ma | Horned dinosaurs | 23% |
| Centrosaurus | 2 | 83.6–72.1 Ma | Horned dinosaurs | 4% |
| Chirostenotes | 2 | 83.6–66 Ma | Theropods | 7% |
| Corythosaurus | 2 | 83.6–72.1 Ma | Ornithopods | 7% |
| Gorgosaurus | 2 | 83.6–72.1 Ma | Theropods | 10% |
| Chasmosaurus | 1 | 83.6–72.1 Ma | Horned dinosaurs | 5% |
| Daspletosaurus | 1 | 83.6–72.1 Ma | Theropods | 5% |
| Gryposaurus | 1 | 199.5–72.1 Ma | Ornithopods | 3% |
| Kritosaurus | 1 | 83.6–72.1 Ma | Ornithopods | 4% |
| Ornithomimus | 1 | 83.6–66 Ma | Theropods | 3% |
| Panoplosaurus | 1 | 83.6–66 Ma | Armoured & plated dinosaurs | 7% |
| Tyrannosaurus | 1 | 72.1–66 Ma | Theropods | 1% |
Age ranges of its genera
Overall stage range of each genus (all formations).
Where it crops out
Fossil records with coordinates.
Groups present
Theropods (9), horned dinosaurs (3), ornithopods (3), armoured & plated dinosaurs (3), dome-headed dinosaurs (1).