Rock formation · Cretaceous · United States
Ferris Formation
The Ferris Formation holds 10 genera from this site (9th of 26 formations), in 42 fossil records. Its dinosaur-bearing records date to the Maastrichtian (72.1–66 Ma), with finds in Wyoming.
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 |
|---|---|---|---|---|
| Saurornitholestes | 14 | 83.6–66 Ma | Theropods | 9% |
| Ankylosaurus | 5 | 72.1–66 Ma | Armoured & plated dinosaurs | 31% |
| Troodon | 5 | 83.6–66 Ma | Theropods | 5% |
| Panoplosaurus | 4 | 83.6–66 Ma | Armoured & plated dinosaurs | 27% |
| Tyrannosaurus | 4 | 72.1–66 Ma | Theropods | 5% |
| Dromaeosaurus | 3 | 83.6–66 Ma | Theropods | 6% |
| Pachycephalosaurus | 3 | 72.1–66 Ma | Dome-headed dinosaurs | 9% |
| Triceratops | 2 | 72.1–66 Ma | Horned dinosaurs | 1% |
| Ornithomimus | 1 | 83.6–66 Ma | Theropods | 3% |
| Struthiomimus | 1 | 83.6–66 Ma | Theropods | 6% |
Age ranges of its genera
Overall stage range of each genus (all formations).
Where it crops out
Fossil records with coordinates.
Groups present
Theropods (6), armoured & plated dinosaurs (2), dome-headed dinosaurs (1), horned dinosaurs (1).