Ischyromys fossil map
Where fossils of Ischyromys have been found, shown on the Earth as it looked about 30 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 30 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 | 45.9–29.5 million years ago (Lutetian to Rupelian) |
| Periods | Paleogene |
| Family | Ischyromyidae |
| Named by | Leidy 1856 |
| Fossil records | 276 occurrences at 41 locations (PBDB) |
| Found in | United States, Canada |
| Rock formations | Brule, txn:41390, White River, Chadron, Renova, Cypress Hills |
About Ischyromys
Ischyromys is an extinct genus of rodent from North America.
Text in “About” is quoted from the Wikipedia article Ischyromys (revision 1376808859), 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: Q2211588.
