Eotitanops fossil map
Where fossils of Eotitanops 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 | 56–41.03 million years ago (Ypresian to Lutetian) |
| Periods | Paleogene |
| Family | Brontotheriidae |
| Named by | Osborn 1907 |
| Fossil records | 70 occurrences at 18 locations (PBDB) |
| Found in | United States, Pakistan |
| Rock formations | Wind River, Huerfano, Kuldana, Aycross, Wasatch, Willwood |
About Eotitanops
Eotitanops (lit. 'dawn titanic face') is an extinct genus of primitive brontothere that lived in Asia and North America during the Early Eocene. Eotitanops is generally considered to be the most basal (primitive) brontothere and may represent the earliest member of the group.
Two species of Eotitanops are currently recognized from North America, the type and larger species E. borealis, known from the Colorado, Wyoming, and Baja California, and the smaller species E. gregoryi (also known under the junior synonym E. minimus) from Colorado and Wyoming. Eotitanops fossils from Pakistan, contemporary with the North American species, have been assigned to a third species, E. pakistanensis. Fragmentary fossils of primitive brontotheres found on the Arctic Ellesmere Island in Canada may also belong to Eotitanops.
Eotitanops lived during the warm Early Eocene Climatic Optimum, and appears to have inhabited humid and densely forested habitats. Eotitanops was a small animal, weighing less than 100 kilograms (220 lb) and standing up to 75 centimetres (2.46 ft) tall at the shoulder. Other than features of its dentition, which place Eotitanops with the brontotheres, it would probably have been difficult to tell Eotitanops apart from primitive representatives of other perissodactyl lineages.
Text in “About” is quoted from the Wikipedia article Eotitanops (revision 1375911392), 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: Q650789.
