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

Antoine, Pierre-Olivier and Roddaz, Martin and Brichau, Stéphanie and Tejada-Lara, Julia and Salas-Gismondi, Rodolfo and Altamirano, Ali and Louterbach, Mélanie and Lambs, Luc and Otto, Thierry and Brusset, Stéphane Middle Miocene vertebrates from the Amazonian Madre de Dios Subandean Zone, Perú. (2013) Journal of South American Earth Sciences, 42. 91-102. ISSN 08959811

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Official URL: http://dx.doi.org/10.1016/j.jsames.2012.07.008

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: ~15.6e13.0 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).

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Journal of South American Earth Sciences website : http://www.sciencedirect.com/science/journal/08959811
HAL Id:hal-00956894
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
Other partners > Institut Français d'Etudes Andines (PERU)
Other partners > Ministère des Affaires étrangères (FRANCE)
Other partners > Universidad Nacional Mayor de San Marcos - UNMSM (PERU)
Laboratory name:
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Deposited By: Luc LAMBS
Deposited On:07 Mar 2014 14:30

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