Mammacyon fossil map
Where fossils of Mammacyon have been found, shown on the Earth as it looked about 30 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 30 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 | 41.03–18.5 million years ago (Bartonian to Burdigalian) |
| Periods | Paleogene, Neogene |
| Family | Amphicyonidae |
| Named by | Loomis 1936 |
| Fossil records | 16 occurrences at 6 locations (PBDB) |
| Found in | United States, Mexico |
| Rock formations | txn:41266, Monroe Creek, Sharps, Harrison, Penney Farms, Yolomécatl |
About Mammacyon
Mammacyon is an extinct genus of medium-sized amphicyonids endemic to North America during the Late Oligocene and Early Miocene. It lived from 26.3 to 20.4 Ma, existing for approximately 6 million years.
Text in “About” is quoted from the Wikipedia article Mammacyon (revision 1258131011), 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: Q6745736.
