Middle Miocene vertebrates from the Amazonian Madre de Dios Subandean Zone, Perú

Pierre Olivier Antoine, Martin Roddaz, Stéphanie Brichau, Julia Tejada-Lara, Rodolfo Salas-Gismondi, Ali Altamirano, Mélanie Louterbach, Luc Lambs, Thierry Otto, Stéphane Brusset

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Abstract

A new middle Miocene vertebrate fauna from Peruvian Amazonia is described. It yields the marsupials Sipalocyon sp. (Hathliacynidae) and Marmosa (Micoureus) cf. laventica (Didelphidae), as well as an unidentified glyptodontine xenarthran and the rodents Guiomys sp. (Caviidae), " Scleromys" sp., cf. quadrangulatus-schurmanni-colombianus (Dinomyidae), an unidentified acaremyid, and cf. Microsteiromys sp. (Erethizontidae). Apatite Fission Track provides a detrital age (17.1 ± 2.4 Ma) for the locality, slightly older than its inferred biochronological age (Colloncuran-early Laventan South American Land Mammal Ages: ~15.6-13.0 Ma). Put together, both the mammalian assemblage and lithology of the fossil-bearing level point to a mixture of tropical rainforest environment and more open habitats under a monsoonal-like tropical climate. The fully fluvial origin of the concerned sedimentary sequence suggests that the Amazonian Madre de Dios Subandean Zone was not part of the Pebas mega-wetland System by middle Miocene times. This new assemblage seems to reveal a previously undocumented " spatiotemporal transition" between the late early Miocene assemblages from high latitudes (Patagonia and Southern Chile) and the late middle Miocene faunas of low latitudes (Colombia, Perú, Venezuela, and ?Brazil).
Original languageAmerican English
Pages (from-to)91-102
Number of pages12
JournalJournal of South American Earth Sciences
Volume42
DOIs
StatePublished - 1 Mar 2013

Keywords

  • Biochronology
  • Biogeography
  • Colloncuran-early Laventan
  • Fission track age
  • Marsupialia
  • Rodentia

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    Antoine, P. O., Roddaz, M., Brichau, S., Tejada-Lara, J., Salas-Gismondi, R., Altamirano, A., Louterbach, M., Lambs, L., Otto, T., & Brusset, S. (2013). Middle Miocene vertebrates from the Amazonian Madre de Dios Subandean Zone, Perú. Journal of South American Earth Sciences, 42, 91-102. https://doi.org/10.1016/j.jsames.2012.07.008