Eucastor fossil map
Where fossils of Eucastor have been found, shown on the Earth as it looked about 15 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 15 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 | 23.04–1.8 million years ago (Aquitanian to Gelasian) |
| Periods | Neogene, Quaternary |
| Family | Castoridae |
| Named by | Allen 1877 |
| Fossil records | 128 occurrences at 35 locations (PBDB) |
| Found in | United States, Canada, China |
| Rock formations | Valentine, txn:41534, Ash Hollow, Wood Mountain, Juntura, Snake Creek |
About Eucastor
Eucastor is an extinct genus of beaver-grouped rodents.
Based on the available evidence of the foramina, Eucastor most likely is closely related to Castor, but not in its direct lineage.
It has two species, the type Eucastor (formerly Castor) tortus, and E. malheurensis
Text in “About” is quoted from the Wikipedia article Eucastor (revision 1258125007), 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: Q24883974.
_(cropped).jpg){kind=link}