Nacimiento Formation
| Nacimiento Formation | |
|---|---|
| Stratigraphic range: Paleocene ~ | |
The badlands below Angel Peak are made up of Nacimiento Formation rocks | |
| Type | Formation |
| Underlies | San Jose Formation |
| Overlies | Ojo Alamo Formation |
| Thickness | 254 m (833 ft) |
| Lithology | |
| Primary | Shale |
| Other | Siltstone, sandstone |
| Location | |
| Coordinates | 36°00′46″N 106°59′08″W / 36.0126977°N 106.9855481°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Nacimiento (now Cuba, New Mexico) |
| Named by | J.H. Gardner |
| Year defined | 1910 |
Nacimiento Formation (the United States) Nacimiento Formation (New Mexico) | |
The Nacimiento Formation is a sedimentary rock formation in the San Juan Basin of western New Mexico (United States). It is dated to approximately 61.0–65.7 million years ago, corresponding to the early and middle Paleocene. The formation has yielded numerous fossil assemblages from the interval following the Cretaceous–Paleogene extinction event, which have been used to study biotic recovery and the early diversification of mammals after the extinction.