Title
Middle Miocene vertebrates from the Amazonian Madre de Dios Subandean Zone, Perú
Date Issued
01 March 2013
Access level
open access
Resource Type
journal article
Author(s)
Antoine P.O.
Roddaz M.
Brichau S.
Louterbach M.
Lambs L.
Otto T.
Brusset S.
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). © 2012 Elsevier Ltd.
Start page
91
End page
102
Volume
42
Language
English
OCDE Knowledge area
Paleontología
Subjects
Scopus EID
2-s2.0-84871158942
Source
Journal of South American Earth Sciences
ISSN of the container
08959811
Sponsor(s)
The field trips to MD-67 were funded by the écoSystèmes Paléogènes d'AMazonie program (SPAM) of the University of Toulouse, France , and by the Paleo2 Programme of the Centre National de la Recherche Scientifique . S. Brusset benefited from a financial support of the convenio IRD-PeruPetro . We would like to thank the volunteer Nicolas Childovski for his help in the field and our colleague Patrice Baby for the pictures used in the Fig. 2 A and B and his pivotal role in launching the Amazonian field project. We are much indebted to Alejandro G. Kramarz and to Adriana Candela for discussing on rodent affinities and providing us with pivotal references and pictures. J.J. Flynn (AMNH) and C. Argot (MNHN) kindly granted access to the collections under their care. F. Catzeflis provided priceless comparison material of living marmosine marsupials. L. Marivaux granted access to the multifocus stereomicroscopic camera funded by the ANR-ERC Palasiafrica Program (ANR-08-JCJC-017), took the picture illustrated in Fig. 2 C, and highly improved an earlier version of the manuscript. Two anonymous reviewers provided constructive comments and valuable remarks. Publication ISE-M 2012-086.
Sources of information:
Directorio de Producción Científica
Scopus