Chacopterygus fossil map
Where fossils of Chacopterygus have been found, shown on the Earth as it looked about 66 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 66 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 | 66–63.4 million years ago (Danian) |
| Periods | Paleogene |
| Family | Cimolestidae |
| Named by | Williamson et al. 2011 |
| Fossil records | 2 occurrences at 1 locations (PBDB) |
| Found in | United States |
| Rock formations | Nacimiento |
About Chacopterygus
Chacopterygus is an extinct genus of cimolestid mammal which existed in New Mexico, during the early Paleocene (middle Puercan age). Its fossils have been recovered from the Nacimiento Formation, San Juan Basin, New Mexico. It was first named by Thomas E. Williamson, Anne Weil and Barbara Standhardt in 2011 and the type species is Chacopterygus minutus.
Text in “About” is quoted from the Wikipedia article Chacopterygus (revision 1368550249), 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: Q5066126.
