Rock formation · Cretaceous · United States
Hell Creek Formation
The Hell Creek Formation holds 16 genera from this site (4th of 26 formations), in 249 fossil records. Its dinosaur-bearing records date to the Maastrichtian (72.1–66 Ma), with finds in Montana, South Dakota and North Dakota.
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 |
|---|---|---|---|---|
| Triceratops | 65 | 72.1–66 Ma | Horned dinosaurs | 39% |
| Tyrannosaurus | 49 | 72.1–66 Ma | Theropods | 58% |
| Edmontosaurus | 33 | 72.1–66 Ma | Ornithopods | 39% |
| Thescelosaurus | 29 | 83.6–66 Ma | Ornithopods | 53% |
| Pachycephalosaurus | 19 | 72.1–66 Ma | Dome-headed dinosaurs | 56% |
| Chirostenotes | 14 | 83.6–66 Ma | Theropods | 50% |
| Saurornitholestes | 11 | 83.6–66 Ma | Theropods | 7% |
| Troodon | 10 | 83.6–66 Ma | Theropods | 10% |
| Ankylosaurus | 4 | 72.1–66 Ma | Armoured & plated dinosaurs | 25% |
| Dromaeosaurus | 3 | 83.6–66 Ma | Theropods | 6% |
| Torosaurus | 3 | 72.1–66 Ma | Horned dinosaurs | 25% |
| Edmontonia | 2 | 83.6–66 Ma | Armoured & plated dinosaurs | 12% |
| Gorgosaurus | 2 | 83.6–72.1 Ma | Theropods | 10% |
| Ornithomimus | 2 | 83.6–66 Ma | Theropods | 6% |
| Stegoceras | 2 | 83.6–72.1 Ma | Dome-headed dinosaurs | 4% |
| Citipes | 1 | 83.6–72.1 Ma | Theropods | 8% |
Age ranges of its genera
Overall stage range of each genus (all formations).
Where it crops out
Fossil records with coordinates.
Groups present
Theropods (8), armoured & plated dinosaurs (2), ornithopods (2), dome-headed dinosaurs (2), horned dinosaurs (2).