Orohippus fossil map
Where fossils of Orohippus 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 | Equidae |
| Named by | Marsh 1872 |
| Fossil records | 138 occurrences at 20 locations (PBDB) |
| Found in | United States |
| Rock formations | Bridger, Wind River, txn:42984, Aycross, Wasatch, Washakie |
About Orohippus
Orohippus (from the Greek ὄρος óros, 'mountain' and ἵππος híppos, 'horse') is an extinct equid that lived in the Eocene (about 50 million years ago). Its fossils have been unearthed in Oregon, Colorado, Utah, and Wyoming.
Text in “About” is quoted from the Wikipedia article Orohippus (revision 1360715319), 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: Q679501.
