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 ArgentinaGolfo San Jorge Basin
[2]
Coquimbo Formation ChileTongoy Bay
[3]
Gran Bajo del Gualicho Formation ArgentinaColorado Basin
[4]
Huaylas Formation ChileParinacota Province
[5]
Mauri Formation BoliviaAltiplano Basin
[6]
Navidad Formation ChileChilean Coast Range
[7]
Paraná Formation ArgentinaParaná Basin
[8]
Pebas Formation Brazil
 Colombia
 Ecuador
 Peru		Amazon Basin
[9][10]
Pisco Formation PeruPisco Basin
[11]
Puerto Madryn Formation ArgentinaValdés Basin
[12]
Urumaco Formation VenezuelaFalcón Basin
[13]
Yecua Formation BoliviaParaná Basin
[14]

Fossil content
Group Fossils Formation Notes
MammalsMegathericulus patagonicusRío Mayo
[15]
Caraguatypotherium munozi, Epipeltephilus caraguensisHuaylas
[16][17]
Brujadelphis ankylorostrisPisco
[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]
BirdsKuntur cardenasi, Ramphastosula aguirrei, Sula brandi, S. figueroaePisco
[24][25]
Madrynornis mirandus, Palaeospheniscus bergi, Accipitridae indet., Dendrocygninae indet., Psilopteridae indet.Puerto
Madryn
[19][20]
[26][27]
ReptilesMourasuchus sp., Pleurodira indet.Yecua
[28]
FishesCosmopolitodus hastalisCoquimbo
[29]
Loricariidae indet., Percomorpha indet., Siluriformes indet.Puerto
Madryn
[19]
cf. Ariidae indet., Teleostei indet.Yecua
[28]

References
  1. Paleo Database: Mayoan
  2. Ecosteguy et al., 2003
  3. Le Roux et al., 2006, p.49
  4. Reichler, 2010, p.181
  5. García et al., 1999, p.251
  6. Marshall & Sempere, 1991, p.636
  7. Finger et al., 2007, p.13
  8. Martín Pérez, 2013, p.51
  9. Antoine et al., 2016, p.56
  10. Wesselingh et al., 2006, p.304
  11. Brand et al., 2011
  12. Acosta Hospitaleche et al., 2007, p.301
  13. Linares, 2004, p.16
  14. Hernández et al., 2002, p.5
  15. Arroyo Pedregoso at Fossilworks.org
  16. Montoya Sanhueza et al., 2017
  17. Caragua at Fossilworks.org
  18. Lambert et al., 2017
  19. Rincón Chico at Fossilworks.org
  20. La Pastosa at Fossilworks.org
  21. Punta San Román at Fossilworks.org
  22. Playa El Doradillo at Fossilworks.org
  23. Yecua at Fossilworks.org
  24. Stucchi et al., 2015a
  25. Stucchi et al., 2015b
  26. Puerto Madryn Autodromo at Fossilworks.org
  27. Playa Villarino at Fossilworks.org
  28. La Angostura, Margin of Piraí River at Fossilworks.org
  29. Tongoy area Unit 4 at Fossilworks.org

Bibliography
Río Mayo Formation
  • Ecosteguy, Leonardo; Carlos Dal Molín; Mario Franchi; Silvena Guena; Omar Lapido, and Adolfo Genini. 2003. Hoja Geológica 4772-II Lago Buenos Aires, 1–80. Instituto de Geología y Recursos Minerales, Servicio Geológico Minero Argentino. Accessed 2018-09-10.
Coquimbo Formation
Gran Bajo del Gualicho Formation
Huaylas Formation
Mauri Formation
Navidad Formation
Paraná Formation
Pebas Formation
Pisco Formation
Puerto Madryn Formation
Urumaco Formation
Yecua Formation
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