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.^[1]

Etymology

The age is named after the Río Mayo Formation in the Golfo San Jorge Basin of Patagonia, Argentina.

Formations

Locations of Mayoan formations

Formation bold is type	Country	Basin	Notes
Río Mayo Formation	Argentina	Golfo San Jorge Basin	[2]
Coquimbo Formation	Chile	Tongoy Bay	[3]
Gran Bajo del Gualicho Formation	Argentina	Colorado Basin	[4]
Huaylas Formation	Chile	Parinacota Province	[5]
Mauri Formation	Bolivia	Altiplano Basin	[6]
Navidad Formation	Chile	Chilean Coast Range	[7]
Paraná Formation	Argentina	Paraná Basin	[8]
Pebas Formation	Brazil  Colombia  Ecuador  Peru	Amazon Basin	[9][10]
Pisco Formation	Peru	Pisco Basin	[11]
Puerto Madryn Formation	Argentina	Valdés Basin	[12]
Urumaco Formation	Venezuela	Falcón Basin	[13]
Yecua Formation	Bolivia	Paraná Basin	[14]

Fossil content

Group	Fossils	Formation	Notes
Mammals	Megathericulus patagonicus	Río Mayo	[15]
	Caraguatypotherium munozi, Epipeltephilus caraguensis	Huaylas	[16][17]
	Brujadelphis ankylorostris	Pisco	[18]
	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]
	cf. Theosodon sp.	Yecua	[23]
Birds	Kuntur cardenasi, Ramphastosula aguirrei, Sula brandi, S. figueroae	Pisco	[24][25]
	Madrynornis mirandus, Palaeospheniscus bergi, Accipitridae indet., Dendrocygninae indet., Psilopteridae indet.	Puerto Madryn	[19][20] [26][27]
Reptiles	Mourasuchus sp., Pleurodira indet.	Yecua	[28]
Fishes	Cosmopolitodus hastalis	Coquimbo	[29]
	Loricariidae indet., Percomorpha indet., Siluriformes indet.	Puerto Madryn	[19]
	cf. Ariidae indet., Teleostei indet.	Yecua	[28]