A Pliocene–Pleistocene continental biota from Venezuela

dc.creatorCarrillo Briceño, Jorge D.
dc.creatorSánchez, Rodolfo
dc.creatorScheyer, Torsten M.
dc.creatorCarrillo, Juan David
dc.creatorDelfino, Massimo
dc.creatorGeorgalis, Georgios L.
dc.creatorKerber, Leonardo
dc.creatorRuiz Ramoni, Damián
dc.creatorBirindelli, José L. O.
dc.creatorCadena, Edwin A.
dc.creatorRincon, Aldo F.
dc.creatorChavez Hoffmeister, Martin
dc.creatorCarlini, Alfredo Armando
dc.creatorCarvalho, Mónica R.
dc.creatorTrejos Tamayo, Raúl
dc.creatorVallejo, Felipe
dc.creatorJaramillo, Carlos
dc.creatorJones, Douglas S.
dc.creatorSánchez Villagra, Marcelo R.
dc.date2021
dc.date2021-08-25T13:54:39Z
dc.date.accessioned2023-07-15T02:51:06Z
dc.date.available2023-07-15T02:51:06Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/123354
dc.identifierissn:1664-2376
dc.identifierissn:1664-2384
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7463512
dc.descriptionThe Pliocene–Pleistocene transition in the Neotropics is poorly understood despite the major climatic changes that occurred at the onset of the Quaternary. The San Gregorio Formation, the younger unit of the Urumaco Sequence, preserves a fauna that documents this critical transition. We report stingrays, freshwater bony fishes, amphibians, crocodiles, lizards, snakes, aquatic and terrestrial turtles, and mammals. A total of 49 taxa are reported from the Vergel Member (late Pliocene) and nine taxa from the Cocuiza Member (Early Pleistocene), with 28 and 18 taxa reported for the first time in the Urumaco sequence and Venezuela, respectively. Our findings include the first fossil record of the freshwater fishes Megaleporinus, Schizodon, Amblydoras, Scorpiodoras, and the pipesnake Anilius scytale, all from Pliocene strata. The late Pliocene and Early Pleistocene ages proposed here for the Vergel and Cocuiza members, respectively, are supported by their stratigraphic position, palynology, nannoplankton, and 86Sr/88Sr dating. Mammals from the Vergel Member are associated with the first major pulse of the Great American Biotic Interchange. In contrast to the dry conditions prevailing today, the San Gregorio Formation documents mixed open grassland/forest areas surrounding permanent freshwater systems, following the isolation of the northern South American basin from western Amazonia. These findings support the hypothesis that range contraction of many taxa to their current distribution in northern South America occurred rapidly during at least the last 1.5 million years.
dc.descriptionFacultad de Ciencias Naturales y Museo
dc.formatapplication/pdf
dc.format1-76
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectPaleontología
dc.subjectNeogene
dc.subjectNeotropics
dc.subjectNorthern South America
dc.subjectUrumaco sequence
dc.subjectPaleodiversity
dc.subjectPaleodiversity
dc.subjectMegaleporinus
dc.subjectAmblydoras
dc.subjectAnilius
dc.subjectCamelidae
dc.subjectChapalmalania
dc.titleA Pliocene–Pleistocene continental biota from Venezuela
dc.typeArticulo
dc.typeArticulo


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