Acheronodon fossil map
Where fossils of Acheronodon 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 | 66–57.5 million years ago (Danian to Thanetian) |
| Periods | Paleogene |
| Family | Microcosmodontidae |
| Named by | Archibald 1982 |
| Fossil records | 6 occurrences at 3 locations (PBDB) |
| Found in | Canada, United States |
| Rock formations | Paskapoo, Fort Union |
About Acheronodon
Acheronodon is a genus of herbivorous arboreal mammal which belongs to the family Microcosmodontidae and which was endemic to North America during the Early Paleocene subepoch (66—56.8 mya) and in existence for approximately 9.2 million years.
It is a member of the extinct order Multituberculata and lies within the suborder Cimolodonta.
The species Acheronodon garbani is known from fossils found in the Puercan (Paleocene)-age formations of Tullock Formation in Montana (United States) and possible specimens from the Porcupine Hills in Alberta, Canada. The holotype was found in Montana.
Text in “About” is quoted from the Wikipedia article Acheronodon (revision 1368549552), 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: Q726947.
