| Oxaya Formation | |
|---|---|
| Stratigraphic range: Late Oligocene–Early Miocene | |
| Underlies | Zapahuira Formation, Huaylas Formation |
| Overlies | Azapa Formation, Lupica Formation? |
| Thickness | ca. 1,000 m (3,300 ft) |
| Lithology | |
| Primary | Ignimbrite |
| Location | |
| Region | Arica y Parinacota Region |
| Country | Chile |
| Type section | |
| Named for | Oxaya |
Oxaya Formation (Spanish: Formación Oxaya) is a geological formation in northern Chile made up of ignimbrite sheets. The formation formed about 25 to 19 million years ago in the Late Oligocene and Early Miocene.[1] Oxaya Formation is deformed by the Oxaya anticline.[2]