Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)

Autores
Kent, Dennis V.; Santi Malnis, Paula; Colombi, Carina Ester; Alcober, Oscar; Martínez, Ricardo Néstor
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A measured magnetozone sequence defined by 24 sampling sites with normal polarity and 28 sites with reverse polarity characteristic magnetizations was established for the heretofore poorly age-constrained Los Colorados Formation and its dinosaur-bearing vertebrate fauna in the Ischigualasto–Villa Union continental rift basin of Argentina. The polarity pattern in this ∼600-m-thick redbed section can be correlated to Chrons E7r to E15n of the Newark astrochronological polarity time scale. This represents a time interval from 227 to 213 Ma, indicating that the Los Colorados Formation is predominantly Norian in age, ending more than 11 My before the onset of the Jurassic. The magnetochronology confirms that the underlying Ischigualasto Formation and its vertebrate assemblages including some of the earliest known dinosaurs are of Carnian age. The oldest dated occurrences of vertebrate assemblages with dinosaurs in North America (Chinle Formation) are younger (Norian), and thus the rise of dinosaurs was diachronous across the Americas. Paleogeography of the Ischigualasto and Los Colorados Formations indicates prolonged residence in the austral temperate humid belt where a provincial vertebrate fauna with early dinosaurs may have incubated. Faunal dispersal across the Pangean supercontinent in the development of more cosmopolitan vertebrate assemblages later in the Norian may have been in response to reduced contrasts between climate zones and lowered barriers resulting from decreasing atmospheric pCO2 levels.
Fil: Kent, Dennis V.. Rutgers University; Estados Unidos. Columbia University; Estados Unidos
Fil: Santi Malnis, Paula. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Alcober, Oscar. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
Fil: Martínez, Ricardo Néstor. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
Materia
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/156108
Acceder
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spelling Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)Kent, Dennis V.Santi Malnis, PaulaColombi, Carina EsterAlcober, OscarMartínez, Ricardo NéstorTRIASSICDINOSAURSISCHIGUALASTODISPERSALTRIASSICDINOSAURSISCHIGUALASTODISPERSALhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A measured magnetozone sequence defined by 24 sampling sites with normal polarity and 28 sites with reverse polarity characteristic magnetizations was established for the heretofore poorly age-constrained Los Colorados Formation and its dinosaur-bearing vertebrate fauna in the Ischigualasto–Villa Union continental rift basin of Argentina. The polarity pattern in this ∼600-m-thick redbed section can be correlated to Chrons E7r to E15n of the Newark astrochronological polarity time scale. This represents a time interval from 227 to 213 Ma, indicating that the Los Colorados Formation is predominantly Norian in age, ending more than 11 My before the onset of the Jurassic. The magnetochronology confirms that the underlying Ischigualasto Formation and its vertebrate assemblages including some of the earliest known dinosaurs are of Carnian age. The oldest dated occurrences of vertebrate assemblages with dinosaurs in North America (Chinle Formation) are younger (Norian), and thus the rise of dinosaurs was diachronous across the Americas. Paleogeography of the Ischigualasto and Los Colorados Formations indicates prolonged residence in the austral temperate humid belt where a provincial vertebrate fauna with early dinosaurs may have incubated. Faunal dispersal across the Pangean supercontinent in the development of more cosmopolitan vertebrate assemblages later in the Norian may have been in response to reduced contrasts between climate zones and lowered barriers resulting from decreasing atmospheric pCO2 levels.Fil: Kent, Dennis V.. Rutgers University; Estados Unidos. Columbia University; Estados UnidosFil: Santi Malnis, Paula. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Alcober, Oscar. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; ArgentinaFil: Martínez, Ricardo Néstor. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; ArgentinaNational Academy of Sciences2014-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/156108Kent, Dennis V.; Santi Malnis, Paula; Colombi, Carina Ester; Alcober, Oscar; Martínez, Ricardo Néstor; Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina); National Academy of Sciences; Proceedings of the National Academy of Sciences of The United States of America; 111; 22; 4-2014; 7958-79630027-84241091-6490CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.pnas.org/doi/suppl/10.1073/pnas.1402369111info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.1402369111info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:52:07Zoai:ri.conicet.gov.ar:11336/156108instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:52:07.962CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
title Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
spellingShingle Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
Kent, Dennis V.
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
title_short Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
title_full Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
title_fullStr Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
title_full_unstemmed Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
title_sort Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina)
dc.creator.none.fl_str_mv Kent, Dennis V.
Santi Malnis, Paula
Colombi, Carina Ester
Alcober, Oscar
Martínez, Ricardo Néstor
author Kent, Dennis V.
author_facet Kent, Dennis V.
Santi Malnis, Paula
Colombi, Carina Ester
Alcober, Oscar
Martínez, Ricardo Néstor
author_role author
author2 Santi Malnis, Paula
Colombi, Carina Ester
Alcober, Oscar
Martínez, Ricardo Néstor
author2_role author
author
author
author
dc.subject.none.fl_str_mv TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
topic TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
TRIASSIC
DINOSAURS
ISCHIGUALASTO
DISPERSAL
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A measured magnetozone sequence defined by 24 sampling sites with normal polarity and 28 sites with reverse polarity characteristic magnetizations was established for the heretofore poorly age-constrained Los Colorados Formation and its dinosaur-bearing vertebrate fauna in the Ischigualasto–Villa Union continental rift basin of Argentina. The polarity pattern in this ∼600-m-thick redbed section can be correlated to Chrons E7r to E15n of the Newark astrochronological polarity time scale. This represents a time interval from 227 to 213 Ma, indicating that the Los Colorados Formation is predominantly Norian in age, ending more than 11 My before the onset of the Jurassic. The magnetochronology confirms that the underlying Ischigualasto Formation and its vertebrate assemblages including some of the earliest known dinosaurs are of Carnian age. The oldest dated occurrences of vertebrate assemblages with dinosaurs in North America (Chinle Formation) are younger (Norian), and thus the rise of dinosaurs was diachronous across the Americas. Paleogeography of the Ischigualasto and Los Colorados Formations indicates prolonged residence in the austral temperate humid belt where a provincial vertebrate fauna with early dinosaurs may have incubated. Faunal dispersal across the Pangean supercontinent in the development of more cosmopolitan vertebrate assemblages later in the Norian may have been in response to reduced contrasts between climate zones and lowered barriers resulting from decreasing atmospheric pCO2 levels.
Fil: Kent, Dennis V.. Rutgers University; Estados Unidos. Columbia University; Estados Unidos
Fil: Santi Malnis, Paula. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Colombi, Carina Ester. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Alcober, Oscar. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
Fil: Martínez, Ricardo Néstor. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
description A measured magnetozone sequence defined by 24 sampling sites with normal polarity and 28 sites with reverse polarity characteristic magnetizations was established for the heretofore poorly age-constrained Los Colorados Formation and its dinosaur-bearing vertebrate fauna in the Ischigualasto–Villa Union continental rift basin of Argentina. The polarity pattern in this ∼600-m-thick redbed section can be correlated to Chrons E7r to E15n of the Newark astrochronological polarity time scale. This represents a time interval from 227 to 213 Ma, indicating that the Los Colorados Formation is predominantly Norian in age, ending more than 11 My before the onset of the Jurassic. The magnetochronology confirms that the underlying Ischigualasto Formation and its vertebrate assemblages including some of the earliest known dinosaurs are of Carnian age. The oldest dated occurrences of vertebrate assemblages with dinosaurs in North America (Chinle Formation) are younger (Norian), and thus the rise of dinosaurs was diachronous across the Americas. Paleogeography of the Ischigualasto and Los Colorados Formations indicates prolonged residence in the austral temperate humid belt where a provincial vertebrate fauna with early dinosaurs may have incubated. Faunal dispersal across the Pangean supercontinent in the development of more cosmopolitan vertebrate assemblages later in the Norian may have been in response to reduced contrasts between climate zones and lowered barriers resulting from decreasing atmospheric pCO2 levels.
publishDate 2014
dc.date.none.fl_str_mv 2014-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/156108
Kent, Dennis V.; Santi Malnis, Paula; Colombi, Carina Ester; Alcober, Oscar; Martínez, Ricardo Néstor; Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina); National Academy of Sciences; Proceedings of the National Academy of Sciences of The United States of America; 111; 22; 4-2014; 7958-7963
0027-8424
1091-6490
CONICET Digital
CONICET
url http://hdl.handle.net/11336/156108
identifier_str_mv Kent, Dennis V.; Santi Malnis, Paula; Colombi, Carina Ester; Alcober, Oscar; Martínez, Ricardo Néstor; Age constraints on the dispersal of dinosaurs in the Late Triassic from magnetochronology of the Los Colorados Formation (Argentina); National Academy of Sciences; Proceedings of the National Academy of Sciences of The United States of America; 111; 22; 4-2014; 7958-7963
0027-8424
1091-6490
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.pnas.org/doi/suppl/10.1073/pnas.1402369111
info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.1402369111
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv National Academy of Sciences
publisher.none.fl_str_mv National Academy of Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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