Nacimiento Formation

Nacimiento Formation
Stratigraphic range: Paleocene
~65.7–61 Ma
The badlands below Angel Peak are made up of Nacimiento Formation rocks
TypeFormation
UnderliesSan Jose Formation
OverliesOjo Alamo Formation
Thickness254 m (833 ft)
Lithology
PrimaryShale
OtherSiltstone, sandstone
Location
Coordinates36°00′46″N 106°59′08″W / 36.0126977°N 106.9855481°W / 36.0126977; -106.9855481
RegionNew Mexico
CountryUnited States
Type section
Named forNacimiento (now Cuba, New Mexico)
Named byJ.H. Gardner
Year defined1910
Nacimiento Formation is located in the United States
Nacimiento Formation
Nacimiento Formation (the United States)
Nacimiento Formation is located in New Mexico
Nacimiento Formation
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.