Mayoan
# Mayoan

The Mayoan (Spanish: Mayoense) 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 |
| - | - | - |
| Río Mayo Formation | Argentina | Golfo San Jorge Basin |
| Coquimbo Formation | Chile | Tongoy Bay |
| Gran Bajo del Gualicho Formation | Argentina | Colorado Basin |
| Huaylas Formation | Chile | Parinacota Province |
| Mauri Formation | Bolivia | Altiplano Basin |
| Navidad Formation | Chile | Chilean Coast Range |
| Paraná Formation | Argentina | Paraná Basin |
| Pebas Formation | Brazil Colombia Ecuador Peru | Amazon Basin |
| Pisco Formation | Peru | Pisco Basin |
| Puerto Madryn Formation | Argentina | Valdés Basin |
| Urumaco Formation | Venezuela | Falcón Basin |
| Yecua Formation | Bolivia | Paraná Basin |

## Fossil content

| Group | Fossils | Formation | Notes |
| - | - | - | - |
| Mammals | Megathericulus patagonicus | Río Mayo | |
| Mammals | Caraguatypotherium munozi, Epipeltephilus caraguensis | Huaylas | |
| Mammals | Brujadelphis ankylorostris | Pisco | |
| Mammals | Cardiatherium patagonicum, Kawas benegasorum, Notoziphius bruneti, Scirrotherium carinatum, Lagostomus (Lagostomopsis) sp., Dolichotinae indet., Macraucheniidae indet., Mylodontinae indet., Neuryurini indet., Palaehoplophorini indet. | Puerto Madryn | [19][20] [21][22] |
| Mammals | cf. Theosodon sp. | Yecua | |
| Birds | Kuntur cardenasi, Ramphastosula aguirrei, Sula brandi, S. figueroae | Pisco | |
| Birds | Madrynornis mirandus, Palaeospheniscus bergi, Accipitridae indet., Dendrocygninae indet., Psilopteridae indet. | Puerto Madryn | [19][20] [26][27] |
| Reptiles | Mourasuchus sp., Pleurodira indet. | Yecua | |
| Fishes | Cosmopolitodus hastalis | Coquimbo | |
| Fishes | Loricariidae indet., Percomorpha indet., Siluriformes indet. | Puerto Madryn | |
| Fishes | cf. Ariidae indet., Teleostei indet. | Yecua | |
