Uintatherium fossil map
Where fossils of Uintatherium have been found, shown on the Earth as it looked about 45 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 45 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 56–37.71 million years ago (Ypresian to Bartonian) |
| Periods | Paleogene |
| Family | Uintatheriidae |
| Named by | Leidy 1872 |
| Fossil records | 35 occurrences at 15 locations (PBDB) |
| Found in | United States, China |
| Rock formations | Bridger, Uinta, Aycross, Fowkes, Santiago, Devil's Graveyard |
About Uintatherium
Uintatherium is an extinct genus of dinoceratan mammal that lived during the Eocene epoch. Two species are currently recognized: U. anceps is found in the United States and lived during the early to middle Eocene (50.5–37 million years ago), while U. insperatus is found in China and lived during the middle and late Eocene (48–37 million years ago). The first fossils of Uintatherium were recovered from the Fort Bridger Basin and were initially believed to belong to a new species of brontothere. Several previously recognized species, as well as genera such as Edward Drinker Cope's Loxolophodon and Othniel Charles Marsh's Tinoceras, are now assigned to Uintatherium anceps.
Text in “About” is quoted from the Wikipedia article Uintatherium (revision 1379905299), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 22 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q131558.
