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 |
The Nacimiento Formation is a sedimentary rock formation found in the San Juan Basin of western New Mexico (United States). It has an age of 61 to 65.7 million years, corresponding to the early and middle Paleocene. The formation has yielded an abundance of fossils from shortly after the Cretaceous-Paleogene extinction event that provide clues to the recovery and diversification of mammals following the extinction event.