| 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 found in the San Juan Basin of western New Mexico (United States).[1] 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.