Mesodma fossil map
Where fossils of Mesodma 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 | 100.5–57.5 million years ago (Cenomanian to Thanetian) |
| Periods | Cretaceous, Paleogene |
| Family | Neoplagiaulacidae |
| Named by | Jepsen 1940 |
| Fossil records | 508 occurrences at 105 locations (PBDB) |
| Found in | United States, Canada, Mexico |
| Rock formations | Hell Creek, Lance, Fort Union, Judith River, Scollard, Ravenscrag |
About Mesodma
Mesodma is an extinct genus of mammal, a member of the extinct order Multituberculata within the suborder Cimolodonta, family Neoplagiaulacidae. It lived during the upper Cretaceous and Paleocene Periods of what is now North America. The earliest definitive record is from the late Santonian stage strata of the Straight Cliffs Formation. A single premolar tooth from the lower Cenomanian stage strata of the Cedar Mountain Formation has been tentatively assigned to this genus based on its similarity, but its describers noted that it is unlikely that Mesodma lived during that time.
Text in “About” is quoted from the Wikipedia article Mesodma (revision 1351989110), 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: Q16985422.
