| Abiquiu Formation | |
|---|---|
| Stratigraphic range: Oligocene to Miocene | |
 Abiquiu Formation at Plaza Blanca, north of Abiquiu, New Mexico | |
| Type | Formation |
| Unit of | Santa Fe Group |
| Sub-units | Pedernal Chert |
| Underlies | Tesuque Formation |
| Overlies | El Rito Formation |
| Thickness | 400 m (1,300 ft) |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | conglomerate, mudstone |
| Location | |
| Coordinates | 36°14′24″N 106°17′53″W / 36.240°N 106.298°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named for | Abiquiu, New Mexico |
| Named by | H.T.U. Smith |
| Year defined | 1938 |
  Abiquiu Formation (the United States)  Abiquiu Formation (New Mexico) | |
The Abiquiu Formation is a geologic formation found in northern New Mexico. Radiometric dating constrains its age to between 18 million and 27 million years, corresponding to the late Oligocene to Miocene epochs.[1]
The formation is composed mostly of volcanic debris from the Latir volcanic field, and records the early stages of the opening of the Rio Grande rift in northern New Mexico.[2][3]
Artist Georgia O'Keeffe drew inspiration from her study of the formation at Plaza Blanca.[4]