Duchesneodus fossil map
Where fossils of Duchesneodus 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 million years ago (Ypresian to Priabonian) |
| Periods | Paleogene |
| Family | Brontotheriidae |
| Named by | Lucas and Schoch 1982 |
| Fossil records | 48 occurrences at 10 locations (PBDB) |
| Found in | United States |
| Rock formations | Sespe, Santiago, Devil's Graveyard, Galisteo, Duchesne River, Slim Buttes |
About Duchesneodus
Duchesneodus (lit. 'Duchesnean tooth') is an extinct genus of horned brontothere that lived in North America during the Middle Eocene, in the late Uintan and Duchesnean land mammal ages. Several species of Duchesneodus have been recognized historically but only one species is seen as valid today, D. uintensis. Fossils of Duchesneodus were first discovered in the Duchesne River Formation in Utah. Fossils have also been found in the Galisteo Formation of New Mexico, and in the Vieja Area of Texas.
Duchesneodus was a large brontothere, though smaller than the later Megacerops. No postcranial elements of Duchesneodus have been securely identified, but it was probably similar to Megacerops. Several features of the skull distinguish Duchesneodus from its relatives, notably the presence of a developed dome on the skull's upper surface.
Text in “About” is quoted from the Wikipedia article Duchesneodus (revision 1373556605), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q5311279.
