Cimolomys fossil map
Where fossils of Cimolomys have been found, shown on the Earth as it looked about 66 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 66 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 | 85.7–66 million years ago (Santonian to Maastrichtian) |
| Periods | Cretaceous |
| Family | Cimolomyidae |
| Named by | Marsh 1889 |
| Fossil records | 186 occurrences at 70 locations (PBDB) |
| Found in | United States, Canada |
| Rock formations | Lance, Hell Creek, Mesaverde, Judith River, Wahweap, Milk River |
About Cimolomys
Cimolomys (Greek for "chalk mouse") is a mammal genus from the Upper Cretaceous of North America. It was a member of the extinct order Multituberculata within the suborder Cimolodonta and family Cimolomyidae.
The genus Cimolomys was named by Othniel Charles Marsh in 1889.
Text in “About” is quoted from the Wikipedia article Cimolomys (revision 1299140385), 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: Q5120158.
