New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

Abstract The vertebrate fossil record of the Pampean Region of Argentina occupies an important place in South American vertebrate paleontology. An abundance of localities has long been the main basis for constructing the chronostratigraphical/geochronological scale for the late Neogene–Quaternary of...

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Autores principales:	Francisco J. Prevosti, Cristo O. Romano, Analía M. Forasiepi, Sidney Hemming, Ricardo Bonini, Adriana M. Candela, Esperanza Cerdeño, M. Carolina Madozzo Jaén, Pablo E. Ortiz, François Pujos, Luciano Rasia, Gabriela I. Schmidt, Matias Taglioretti, Ross D. E. MacPhee, Ulyses F. J. Pardiñas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9be85b7bd70b4d53aaf4ed47bfcad9ac
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spelling	oai:doaj.org-article:9be85b7bd70b4d53aaf4ed47bfcad9ac2021-12-02T15:36:31ZNew radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America10.1038/s41598-021-89135-12045-2322https://doaj.org/article/9be85b7bd70b4d53aaf4ed47bfcad9ac2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89135-1https://doaj.org/toc/2045-2322Abstract The vertebrate fossil record of the Pampean Region of Argentina occupies an important place in South American vertebrate paleontology. An abundance of localities has long been the main basis for constructing the chronostratigraphical/geochronological scale for the late Neogene–Quaternary of South America, as well as for understanding major patterns of vertebrate evolution, including the Great American Biotic Interchange. However, few independently-derived dates are available for constraining this record. In this contribution, we present new 40Ar/39Ar dates on escorias (likely the product of meteoric impacts) from the Argentinean Atlantic coast and statistically-based biochronological analyses that help to calibrate Late Miocene–Pliocene Pampean faunal successions. For the type areas of the Montehermosan and Chapadmalalan Ages/Stages, our results delimit their age ranges to 4.7–3.7 Ma and ca. 3.74–3.04 Ma, respectively. Additionally, from Buenos Aires Province, dates of 5.17 Ma and 4.33 Ma were recovered for “Huayquerian” and Montehermosan faunas. This information helps to better calibrate important first appearances of allochthonous taxa in South America, including one of the oldest records for procyonids (7.24–5.95 Ma), cricetids (6.95–5.46 Ma), and tayassuids (> 3.74 Ma, oldest high-confidence record). These results also constrain to ca. 3 Ma the last appearances of the autochthonous sparassodonts, as well as terror birds of large/middle body size in South America. South American faunal turnover during the late Neogene, including Late Pliocene extinctions, is interpreted as a consequence of knock-on effects from global climatic changes and initiation of the icehouse climate regime.Francisco J. PrevostiCristo O. RomanoAnalía M. ForasiepiSidney HemmingRicardo BoniniAdriana M. CandelaEsperanza CerdeñoM. Carolina Madozzo JaénPablo E. OrtizFrançois PujosLuciano RasiaGabriela I. SchmidtMatias TagliorettiRoss D. E. MacPheeUlyses F. J. PardiñasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Francisco J. Prevosti Cristo O. Romano Analía M. Forasiepi Sidney Hemming Ricardo Bonini Adriana M. Candela Esperanza Cerdeño M. Carolina Madozzo Jaén Pablo E. Ortiz François Pujos Luciano Rasia Gabriela I. Schmidt Matias Taglioretti Ross D. E. MacPhee Ulyses F. J. Pardiñas New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
description	Abstract The vertebrate fossil record of the Pampean Region of Argentina occupies an important place in South American vertebrate paleontology. An abundance of localities has long been the main basis for constructing the chronostratigraphical/geochronological scale for the late Neogene–Quaternary of South America, as well as for understanding major patterns of vertebrate evolution, including the Great American Biotic Interchange. However, few independently-derived dates are available for constraining this record. In this contribution, we present new 40Ar/39Ar dates on escorias (likely the product of meteoric impacts) from the Argentinean Atlantic coast and statistically-based biochronological analyses that help to calibrate Late Miocene–Pliocene Pampean faunal successions. For the type areas of the Montehermosan and Chapadmalalan Ages/Stages, our results delimit their age ranges to 4.7–3.7 Ma and ca. 3.74–3.04 Ma, respectively. Additionally, from Buenos Aires Province, dates of 5.17 Ma and 4.33 Ma were recovered for “Huayquerian” and Montehermosan faunas. This information helps to better calibrate important first appearances of allochthonous taxa in South America, including one of the oldest records for procyonids (7.24–5.95 Ma), cricetids (6.95–5.46 Ma), and tayassuids (> 3.74 Ma, oldest high-confidence record). These results also constrain to ca. 3 Ma the last appearances of the autochthonous sparassodonts, as well as terror birds of large/middle body size in South America. South American faunal turnover during the late Neogene, including Late Pliocene extinctions, is interpreted as a consequence of knock-on effects from global climatic changes and initiation of the icehouse climate regime.
format	article
author	Francisco J. Prevosti Cristo O. Romano Analía M. Forasiepi Sidney Hemming Ricardo Bonini Adriana M. Candela Esperanza Cerdeño M. Carolina Madozzo Jaén Pablo E. Ortiz François Pujos Luciano Rasia Gabriela I. Schmidt Matias Taglioretti Ross D. E. MacPhee Ulyses F. J. Pardiñas
author_facet	Francisco J. Prevosti Cristo O. Romano Analía M. Forasiepi Sidney Hemming Ricardo Bonini Adriana M. Candela Esperanza Cerdeño M. Carolina Madozzo Jaén Pablo E. Ortiz François Pujos Luciano Rasia Gabriela I. Schmidt Matias Taglioretti Ross D. E. MacPhee Ulyses F. J. Pardiñas
author_sort	Francisco J. Prevosti
title	New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
title_short	New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
title_full	New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
title_fullStr	New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
title_full_unstemmed	New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America
title_sort	new radiometric 40ar–39ar dates and faunistic analyses refine evolutionary dynamics of neogene vertebrate assemblages in southern south america
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9be85b7bd70b4d53aaf4ed47bfcad9ac
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New radiometric 40Ar–39Ar dates and faunistic analyses refine evolutionary dynamics of Neogene vertebrate assemblages in southern South America

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