Antoine P. O. auteur aut IRD Roddaz M. auteur aut IRD Brichau Stéphanie auteur aut IRD Tejada-Lara J. auteur aut IRD Salas-Gismondi R. auteur aut IRD Altamirano A. auteur aut IRD Louterbach M. auteur aut IRD Lambs L. auteur aut IRD Otto T. auteur aut IRD Brusset S. auteur aut IRD text journalArticle eng text/pdf born digital access 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: similar to 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, Peru, Venezuela, and ?Brazil). specialized Colloncuran-early Laventan Marsupialia Rodentia Biochronology Fission track age Biogeography PEROU 064 082 080 42 91-102 2013 0895-9811 https://www.documentation.ird.fr/hor/fdi:010060778 10.1016/j.jsames.2012.07.008 0895-9811 [F B010060778] https://www.documentation.ird.fr/hor/fdi:010060778 https://www.documentation.ird.fr/intranet/publi/2013/05/010060778.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-05-31 2017-08-23 fdi:010060778 fre