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Santa Vitória do Palmar, Brazil

Kerber L.,Secao de Paleontologia | Lopes R.P.,Grande Rio University | Vucetich M.G.,Museo de La Plata | Ribeiro A.M.,Secao de Paleontologia | Pereira J.,Museu Coronel Tancredo Fernandes de Mello
Revista Brasileira de Paleontologia | Year: 2011

New records of rodents from the late Pleistocene Chuí Creek, Rio Grande do Sul State, southern Brazil, are here described. A partial dentary with fragmented cheek teeth is identified as Chinchillidae, Lagostomus Brookes cf. L. maximus (Desmarest). Other two specimens are identified as cheek teeth of Dolichotinae indet. (Caviidae). Pleistocene fossils of Lagostomus were previously reported for Argentina and Uruguay. The material of Lagostomus from Chuí Creek represents the first confidently record of this taxon Brazil. Pleistocene fossil remains of Dolichotinae have been found in Argentina, Uruguay and other areas of southern Brazil, though the Brazilian find lack precise stratigraphic information. These new records widen the paleobiogeographic distribution of Lagostomus and confirm the presence of Dolichotinae during the late Pleistocene of southern Brazil. © 2011 by the Sociedade Brasileira de Paleontologia. Source

Lopes R.P.,Federal University of Rio Grande do Sul | Kinoshita A.,Sacred Heart University of Brazil | Baffa O.,University of Sao Paulo | Figueiredo A.M.G.,Brazilian Nuclear Energy Research Institute (IPEN) | And 3 more authors.
Quaternary International | Year: 2014

The Coastal Plain of Rio Grande do Sul state (CPRS), in southern Brazil, encompasses four barrier-lagoon depositional systems formed by marine highstands during the Quaternary, but the ages of the Pleistocene systems older than ~125ka are not precisely known due to the lack of numerical dates. In order to refine the chronology of these deposits, several fossils of terrestrial mammals collected in the fluvial facies of the Lagoon System III and fossil shells from the marine facies of the Barrier System II, exposed in the southern sector of the CPRS, were subject to dating by electron spin resonance (ESR). The ages of the mammalian remains range from 90±10 to 43±3ka, thus representing the last glacial cycle (MIS 4 and 3). The mean EU age of the shells is 224±24.6ka, but this value is considered younger than the 'real' age because of excessive Uranium uptake observed among the younger shells. An estimated mean age of some 235-238ka would agree with other ESR and TL ages obtained for fossils and sediments collected from beds overlying the shells, and would be consistent with the sea-level highstand at the early MIS 7 (substage 7e). The presence of bivalves and foraminifers that indicate ocean temperatures higher than at present seems to corroborate this estimate, given that MIS 7e was characterized by hypsithermal conditions. © 2013 Elsevier Ltd and INQUA. Source

Kerber L.,Federal University of Rio Grande do Sul | Lopes R.P.,Federal University of Rio Grande do Sul | De Oliveira E.V.,Federal University of Pernambuco | Ribeiro A.M.,Fundacao Zoobotanica do Rio Grande do Sul | Pereira J.,Museu Coronel Tancredo Fernandes de Mello
Gaea | Year: 2012

Fossil remains of the sigmodontine rodent Holochilus brasiliensis (Desmarest, 1819) from two geographic areas from the state of Rio Grande do Sul, southern Brazil are reviewed and described here. The specimens came from two localities: Quaraí River in the western region, which has yielded a dentary with an incisor and molars, and Chuí Creek in the eastern region, where a fragmented right dentary and a maxillary fragment with molars were collected. The presence of this taxon in the late Pleistocene of meridional Brazil suggests the existence of perennial water bodies. © 2012 by Unisinos. Source

Pereira J.C.,Museu Coronel Tancredo Fernandes de Mello | Lopes R.P.,Institute Oceanografia | Kerber L.,Museu de Ciencias Naturais
Revista Brasileira de Paleontologia | Year: 2012

The Chuí Creek, located in the southernmost Brazil, is a fossiliferous outcrop known since the late 1960s, which bears important records of late Pleistocene mammals, other vertebrates and invertebrate fossils. The presence of some taxa (e.g. Hydrochoerus hydrochaeris Linnaeus, Tapirus terrestris Linnaeus, Ozotoceros bezoarticus Linneaus), although mentioned on the literature, is still to be confirmed. Specimens from Chuí Creek belonging to several collections are reexamined and new excavations and geological surveys in the area are being conducted. The new records include isolated teeth of cf. Ursidae and Rodentia (Myocastor cf. M. coypus Molina); a complete and articulated skull and jaw of a tayassuid, Catagonus Ameghino, as well as a left dentary of a juvenile ground sloth, Eremotherium cf. E. laurillardi Lund. The ongoing systematic revision led to the confirmation of the presence of the glyptodont Doedicurus Burmeister, represented by a portion of the carapace; the cervid genera Antifer Ameghino and Morenelaphus Carette; and the equids Equus Linnaeus and Hippidion Owen, represented by cranial and dental remains. These findings expand the knowledge on the diversity of the extinct fauna found in the Chuí Creek, and have biogeographic, biostratigraphic and paleoenvironmental implications, which are herein discussed. © 2012 by the Sociedade Brasileira de Paleontologia. Source

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