Monosaulax fossil map
Where fossils of Monosaulax 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 | 33.9–5.09 million years ago (Rupelian to Zanclean) |
| Periods | Paleogene, Neogene |
| Family | Castoridae |
| Named by | Stirton 1935 |
| Fossil records | 140 occurrences at 48 locations (PBDB) |
| Found in | United States, China, France, Switzerland, Canada, Türkiye, Slovakia, Hungary, Kazakhstan |
| Rock formations | txn:41534, Valentine, Fort Randall, Esmeralda, Olcott, Barstow |
About Monosaulax
Monosaulax is an extinct genus of beaver-grouped rodents. It is sometimes treated as a synonym of Eucastor (McKenna and Bell, 1997).
Text in “About” is quoted from the Wikipedia article Monosaulax (revision 1248772785), 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: Q24883977.
