Synoplotherium fossil map
Where fossils of Synoplotherium have been found, shown on the Earth as it looked about 45 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 45 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 | 51.1–39.7 million years ago (Ypresian to Bartonian) |
| Periods | Paleogene |
| Family | Mesonychidae |
| Named by | Cope 1872 |
| Fossil records | 26 occurrences at 5 locations (PBDB) |
| Found in | United States |
| Rock formations | Washakie, Devil's Graveyard |
About Synoplotherium
Synoplotherium (synonym Dromocyon) is an extinct genus of relatively small, wolf-like mesonychids that lived 50 million years ago, in what is now Wyoming.
Synoplotherium coexisted with its larger relative, Mesonyx. Very little else remains known about this mesonychid since its discovery in 1875.
Text in “About” is quoted from the Wikipedia article Synoplotherium (revision 1260314273), 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: Q2080038.
