Casamayoran
The Casamayoran age is a period of geologic time within the Early Eocene epoch of the Paleogene, used more specifically within the South American land mammal age classification. It follows the Riochican and precedes the Mustersan age.
Several astrapotherian mammals are known from this period, such as Antarctodon and Albertogaudrya from Antarctica and Argentina, respectively. Albertogaudrya and Scaglia were the size of a sheep or a small tapir, hence among the larger mammals in South America at this time.
Etymology
This age is named after the Casamayor Formation of the Golfo San Jorge Basin.Formations
| Formation bold is type | Country | Basin | Notes |
| Casamayor Formation | Golfo San Jorge Basin | ||
| Abanico Formation | Abanico Basin | ||
| Bogotá Formation | Altiplano Cundiboyacense | ||
| Cayara Formation | Cochabamba Department | ||
| Chota Formation | Bagua Basin | ||
| Los Cuervos Formation | Cesar-Ranchería Basin | ||
| Fonseca Formation | Fonseca Basin | ||
| Huitrera Formation | Neuquén Basin | ||
| Laguna del Hunco Formation | Cañadón Asfalto Basin | ||
| Lumbrera Formation | Salta Basin | ||
| Maíz Gordo Formation | Salta Basin | ||
| Quebrada de los Colorados Formation | Salta Basin | ||
| Sarmiento Formation | Golfo San Jorge Basin |