Planetetherium fossil map
Where fossils of Planetetherium have been found, shown on the Earth as it looked about 56 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 56 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 | 57.5–56 million years ago (Thanetian) |
| Periods | Paleogene |
| Named by | Simpson 1928 |
| Fossil records | 6 occurrences at 3 locations (PBDB) |
| Found in | United States |
| Rock formations | Fort Union, Lower Variegated Sequence |
About Planetetherium
Planetetherium is an extinct genus of herbivorous plagiomenid mammal endemic to North America during the Paleogene living from 56.8 to 55.4 mya, existing for approximately 1.4 million years.
Fossils have been discovered in strata formed from ancient cypress forests, suggesting that this was the animal's preferred habitat.
Text in “About” is quoted from the Wikipedia article Planetetherium (revision 1368551772), 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: Q675829.
