Genus · Diplodocidae · Jurassic
Apatosaurus
Named by Marsh 1877
Apatosaurus lived 154.8–145 million years ago, during the Kimmeridgian to Tithonian stages of the Late Jurassic. The Paleobiology Database lists 67 fossil records for it from 1 country (United States) — the 13th most of the 99 genera on this site.
Where it sits in time
Key facts from the records
- Most of what is known comes from one rock unit: 100% of its records are from the Morrison Formation.
- Every record is from United States; Wyoming alone has 28 of them.
- Allosaurus appears in 60% of the collections that hold Apatosaurus; Camarasaurus in 60%.
- Its stage range spans about 9.8 million years (56th longest of 99); it is the 3rd best-recorded of the 19 sauropodomorphs here.
2 accepted species
| Species | Named by | Records |
|---|---|---|
| Apatosaurus louisae | Holland 1915 | 5 |
| Apatosaurus ajax | Marsh 1877 | 3 |
Where it was found
67 records with coordinates.
Found alongside
Rock formations
States & provinces
| Region | Records | Share |
|---|---|---|
| Wyoming | 28 | 42% |
| Colorado | 17 | 25% |
| Utah | 11 | 16% |
| Oklahoma | 4 | 6% |
| New Mexico | 2 | 3% |
| South Dakota | 2 | 3% |
| Montana | 2 | 3% |
| Arizona | 1 | 1% |
Records by stage
Well-dated records, by the stage of their mid-point age.
Depositional settings
Other sauropodomorphs of its time
Same group, overlapping stage range, not found in the same collections.
| Genus | Age | Country | Records |
|---|---|---|---|
| Giraffatitan | 154.8–145 Ma | Tanzania | 42 |
| Cetiosaurus | 168.2–125.77 Ma | United Kingdom, Morocco | 30 |
| Mamenchisaurus | 165.3–145 Ma | China, Mongolia | 24 |
| Brontosaurus | 149.2–145 Ma | United States | 23 |
| Dicraeosaurus | 154.8–145 Ma | Tanzania, Zimbabwe | 19 |
| Omeisaurus | 165.3–145 Ma | China | 13 |
Also from these formations
Data: PBDB taxon 38665 · method