Alphadon fossil map
Where fossils of Alphadon have been found, shown on the Earth as it looked about 75 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 75 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 | 100.5–48.07 million years ago (Cenomanian to Ypresian) |
| Periods | Cretaceous, Paleogene |
| Family | Alphadontidae |
| Named by | Simpson 1927 |
| Fossil records | 220 occurrences at 64 locations (PBDB) |
| Found in | United States, Canada, Portugal, Algeria |
| Rock formations | Hell Creek, Judith River, Mesaverde, Lance, Aguja, txn:67663 |
About Alphadon
Alphadon is an extinct genus of small, primitive mammal that was a member of the metatherians, a group of mammals that includes modern-day marsupials. Its fossils were first discovered and named by George Gaylord Simpson in 1929.
Text in “About” is quoted from the Wikipedia article Alphadon (revision 1376487304), 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: Q3768782.
