Eubrontotherium fossil map
Where fossils of Eubrontotherium 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 | 48.07–37.71 million years ago (Lutetian to Bartonian) |
| Periods | Paleogene |
| Family | Brontotheriidae |
| Named by | Mihlbachler 2007 |
| Fossil records | 2 occurrences at 1 locations (PBDB) |
| Found in | United States |
| Rock formations | Clarno |
About Eubrontotherium
Eubrontotherium (lit. 'true thunder beast') is an extinct genus of horned brontothere that lived in North America and East Asia during the Late Eocene. The genus contains a single species, E. clarnoensis, known from fossils found in the Clarno Formation of Oregon and in the Ergilin Dzo Formation of Mongolia. Eubrontotherium fossils in Mongolia are younger in age than those in the United States; it is unclear if this has paleobiogeographical implications since relatively few fossils of the genus are known.
Although it was not the largest animal in its environment on either continent, Eubrontotherium was a large and heavy brontothere, estimated to have weighed over two tonnes. Eubrontotherium had two short horns in front of its eyes, relatively smaller than the horns of its close relatives.
Text in “About” is quoted from the Wikipedia article Eubrontotherium (revision 1379947610), 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: Q15808749.
