Simpsonotus fossil map
Where fossils of Simpsonotus 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 | 61.66–56 million years ago (Selandian to Thanetian) |
| Periods | Paleogene |
| Family | Henricosborniidae |
| Named by | Pascual et al. 1978 |
| Fossil records | 6 occurrences at 1 locations (PBDB) |
| Found in | Argentina |
| Rock formations | Mealla |
About Simpsonotus
Simpsonotus is an extinct genus of notoungulate mammals in the family Henricosborniidae from the Middle to Late Paleocene of South America. Fossils of the genus have been found in the Mealla Formation, a fluvial and lacustrine sedimentary unit of the Salta Basin in northwestern Argentina. The genus name honors paleontologist George Gaylord Simpson.
Text in “About” is quoted from the Wikipedia article Simpsonotus (revision 1258138441), 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: Q96181783.
