| Atrasado Formation | |
|---|---|
| Stratigraphic range: | |
 Atrasado Formation north of Jemez Springs, New Mexico | |
| Type | Formation |
| Unit of | Madera Group |
| Sub-units | See text |
| Underlies | Bursum Formation |
| Overlies | Gray Mesa Formation |
| Thickness | 272 m (892 ft) |
| Lithology | |
| Primary | Limestone |
| Other | Sandstone, shale |
| Location | |
| Coordinates | 34°41′56″N 107°07′12″W / 34.699°N 107.120°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Atrasado Arroyo |
| Named by | Kelley and Wood |
| Year defined | 1946 |
  Atrasado Formation (the United States)  Atrasado Formation (New Mexico) | |
The Atrasado Formation is a geologic formation in New Mexico. Its fossil assemblage dates the formation to the Kasimovian age of the Pennsylvanian. It was formerly known locally as the Wild Cow Formation or the Guadelupe Box Formation.