A Pliocene–Pleistocene continental biota from Venezuela

The 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 sting...

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Autores principales: Carrillo Briceño, Jorge D., Sánchez, Rodolfo, Scheyer, Torsten M., Carrillo, Juan David, Delfino, Massimo, Georgalis, Georgios L., Kerber, Leonardo, Ruiz Ramoni, Damián, Birindelli, José L. O., Cadena, Edwin A., Rincon, Aldo F., Chavez Hoffmeister, Martin, Carlini, Alfredo Armando, Carvalho, Mónica R., Trejos Tamayo, Raúl, Vallejo, Felipe, Jaramillo, Carlos, Jones, Douglas S., Sánchez Villagra, Marcelo R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Paleontología
Neogene
Neotropics
Northern South America
Urumaco sequence
Paleodiversity
Megaleporinus
Amblydoras
Anilius
Camelidae
Chapalmalania
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123354
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123354
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Neogene
Neotropics
Northern South America
Urumaco sequence
Paleodiversity
Paleodiversity
Megaleporinus
Amblydoras
Anilius
Camelidae
Chapalmalania
spellingShingle Paleontología
Neogene
Neotropics
Northern South America
Urumaco sequence
Paleodiversity
Paleodiversity
Megaleporinus
Amblydoras
Anilius
Camelidae
Chapalmalania
Carrillo Briceño, Jorge D.
Sánchez, Rodolfo
Scheyer, Torsten M.
Carrillo, Juan David
Delfino, Massimo
Georgalis, Georgios L.
Kerber, Leonardo
Ruiz Ramoni, Damián
Birindelli, José L. O.
Cadena, Edwin A.
Rincon, Aldo F.
Chavez Hoffmeister, Martin
Carlini, Alfredo Armando
Carvalho, Mónica R.
Trejos Tamayo, Raúl
Vallejo, Felipe
Jaramillo, Carlos
Jones, Douglas S.
Sánchez Villagra, Marcelo R.
A Pliocene–Pleistocene continental biota from Venezuela
topic_facet Paleontología
Neogene
Neotropics
Northern South America
Urumaco sequence
Paleodiversity
Paleodiversity
Megaleporinus
Amblydoras
Anilius
Camelidae
Chapalmalania
description The 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.
format Articulo
Articulo
author Carrillo Briceño, Jorge D.
Sánchez, Rodolfo
Scheyer, Torsten M.
Carrillo, Juan David
Delfino, Massimo
Georgalis, Georgios L.
Kerber, Leonardo
Ruiz Ramoni, Damián
Birindelli, José L. O.
Cadena, Edwin A.
Rincon, Aldo F.
Chavez Hoffmeister, Martin
Carlini, Alfredo Armando
Carvalho, Mónica R.
Trejos Tamayo, Raúl
Vallejo, Felipe
Jaramillo, Carlos
Jones, Douglas S.
Sánchez Villagra, Marcelo R.
author_facet Carrillo Briceño, Jorge D.
Sánchez, Rodolfo
Scheyer, Torsten M.
Carrillo, Juan David
Delfino, Massimo
Georgalis, Georgios L.
Kerber, Leonardo
Ruiz Ramoni, Damián
Birindelli, José L. O.
Cadena, Edwin A.
Rincon, Aldo F.
Chavez Hoffmeister, Martin
Carlini, Alfredo Armando
Carvalho, Mónica R.
Trejos Tamayo, Raúl
Vallejo, Felipe
Jaramillo, Carlos
Jones, Douglas S.
Sánchez Villagra, Marcelo R.
author_sort Carrillo Briceño, Jorge D.
title A Pliocene–Pleistocene continental biota from Venezuela
title_short A Pliocene–Pleistocene continental biota from Venezuela
title_full A Pliocene–Pleistocene continental biota from Venezuela
title_fullStr A Pliocene–Pleistocene continental biota from Venezuela
title_full_unstemmed A Pliocene–Pleistocene continental biota from Venezuela
title_sort pliocene–pleistocene continental biota from venezuela
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/123354
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