Mayoan
The Mayoan age is a period of geologic time from 11.8 to 10 Ma, within the Middle to Late Miocene epoch of the Neogene, used more specifically within the SALMA classification in South America. It follows the Laventan and precedes the Chasicoan age.
Etymology
The age is named after the Río Mayo Formation in the Golfo San Jorge Basin of Patagonia, Argentina.Formations
| Formation bold is type | Country | Basin | Notes |
| Río Mayo Formation | Golfo San Jorge Basin | ||
| Coquimbo Formation | Tongoy Bay | ||
| Gran Bajo del Gualicho Formation | Colorado Basin | ||
| Huaylas Formation | Parinacota Province | ||
| Mauri Formation | Altiplano Basin | ||
| Navidad Formation | Chilean Coast Range | ||
| Paraná Formation | Paraná Basin | ||
| Pebas Formation | Amazon Basin | ||
| Pisco Formation | Pisco Basin | ||
| Puerto Madryn Formation | Valdés Basin | ||
| Urumaco Formation | Falcón Basin | ||
| Yecua Formation | Paraná Basin |