Deseadan
The Deseadan age is a period of geologic time within the Oligocene epoch of the Paleogene to the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification of South America. It follows the Tinguirirican and precedes the Colhuehuapian age.
Etymology
The age is named after the Deseado Formation of the Deseado Massif in eastern Patagonia, Argentina.Formations
| Formation bold is type | Country | Basin | Notes |
| Deseado Formation | Deseado Massif | ||
| Abanico Formation | Abanico Basin | ||
| Agua de la Piedra Formation | Precordillera | ||
| Barzalosa Formation | Upper Magdalena Valley | ||
| Castillo Formation | Falcón Basin | ||
| Chambira Formation | Ucayali Basin | ||
| Chilcatay Formation | Pisco Basin | ||
| Dos Bocas Formation | Progreso Basin | ||
| Fray Bentos Formation | Paraná Basin | ||
| Monte León Formation | Austral Basin | ||
| Moquegua Formation | Moquegua Basin | ||
| Mugrosa Formation | Middle Magdalena Valley | ||
| Petaca Formation | Subandean Belt | ||
| "Puca Group" - Lacayani fauna | Subandean Belt | ||
| Río Baguales Formation | Aysén Basin | ||
| Salla Formation | Salla-Luribay Basin | ||
| Sarmiento Formation | Golfo San Jorge Basin | ||
| Tremembé Formation/São Paulo Formation | Taubaté Basin |