Rock formation · Cretaceous · United States
Lance Formation
The Lance Formation holds 16 genera from this site (4th of 26 formations), in 158 fossil records. Its dinosaur-bearing records date to the Maastrichtian (72.1–66 Ma), with finds in Wyoming, South Dakota and Montana.
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 | 68 | 72.1–66 Ma | Horned dinosaurs | 41% |
| Edmontosaurus | 28 | 72.1–66 Ma | Ornithopods | 33% |
| Tyrannosaurus | 12 | 72.1–66 Ma | Theropods | 14% |
| Thescelosaurus | 10 | 83.6–66 Ma | Ornithopods | 18% |
| Ornithomimus | 9 | 83.6–66 Ma | Theropods | 26% |
| Pachycephalosaurus | 9 | 72.1–66 Ma | Dome-headed dinosaurs | 26% |
| Dryptosaurus | 6 | 83.6–66 Ma | Theropods | 46% |
| Ankylosaurus | 3 | 72.1–66 Ma | Armoured & plated dinosaurs | 19% |
| Troodon | 3 | 83.6–66 Ma | Theropods | 3% |
| Dromaeosaurus | 2 | 83.6–66 Ma | Theropods | 4% |
| Stenonychosaurus | 2 | 83.6–66 Ma | Theropods | 14% |
| Torosaurus | 2 | 72.1–66 Ma | Horned dinosaurs | 17% |
| Albertosaurus | 1 | 83.6–66 Ma | Theropods | 3% |
| Edmontonia | 1 | 83.6–66 Ma | Armoured & plated dinosaurs | 6% |
| Panoplosaurus | 1 | 83.6–66 Ma | Armoured & plated dinosaurs | 7% |
| 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 (8), armoured & plated dinosaurs (3), ornithopods (2), horned dinosaurs (2), dome-headed dinosaurs (1).