A new chronology for middle Eocene-early Miocene South American Land Mammal Ages

Autores
Dunn, Regan E.; Madden, Richard H.; Kohn, Matthew J.; Schmitz, Mark D.; Stromberg, Caroline A. E.; Carlini, Alfredo Armando; Re, Guillermo Hector; Crowley, James
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Cenozoic South American Land MammalAges (SALMAs) have historically beencorrelated to the geologic time scale using40Ar/39Ar dating and magnetostratigraphy.At Gran Barranca (68.7°W, 45.7°S)?one ofSouth America?s key areas for constrainingSALMAs?existing radioisotopic ages haveuncertainties of up to 4 m.y. To better constrainthe ages of mammalian assemblages,we employed high-precision (±<40 k.y.) U-Pbdating using single zircon crystals. We datednine tuffs from the Sarmiento Formationcontaining middle Eocene?early Miocenefaunas (Barrancan, Mustersan, Tinguirirican,Deseadan, Colhuehuapian, and ?Pinturan?).The new dates span from 39.861 ±0.037 Ma to 19.041 ± 0.027 Ma. The La CanchaTuff, occurring within the Tinguiriricanfaunal level yielded an age of 33.581 ± 0.015Ma, confi rming that the Vera Member containsthe only fossiliferous geologic sectionencompassing the Eocene?Oligocene transitionin the Southern Hemisphere. The pre-Deseadan fauna, La Cantera, is ≤30.77 Ma,the age of the Colhuehuapian is expanded to21.1?20.1 Ma, and the Pinturan may be asold as ca. 19 Ma.The new U-Pb dates confi rm that atmospherictemperatures and vegetationremained constant across the Eocene?Oligocene transition in Patagonia and thathypsodonty occurred in South American ungulatesmuch earlier than on any other continent.Additionally, refi nement of the SALMAboundaries will eventually provide the contextnecessary to compare faunal transitionsacross continents, although currently toomuch data are missing to allow such comparisons.Finally, the new ages provide a highresolutionage model from which hypothesesabout rates of environmental and evolutionarychange at Gran Barranca can be tested.
Fil: Dunn, Regan E.. University of Washington; Estados Unidos
Fil: Madden, Richard H.. University of Chicago; Estados Unidos
Fil: Kohn, Matthew J.. Boise State University; Estados Unidos
Fil: Schmitz, Mark D.. Boise State University; Estados Unidos
Fil: Stromberg, Caroline A. E.. University of Washington; Estados Unidos
Fil: Carlini, Alfredo Armando. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Re, Guillermo Hector. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina
Fil: Crowley, James. Boise State University; Estados Unidos
Materia
Eocene to Miocene
Chronology
Patagonia
Land Mammal Ages
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:11336/241123
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/241123
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A new chronology for middle Eocene-early Miocene South American Land Mammal AgesDunn, Regan E.Madden, Richard H.Kohn, Matthew J.Schmitz, Mark D.Stromberg, Caroline A. E.Carlini, Alfredo ArmandoRe, Guillermo HectorCrowley, JamesEocene to MioceneChronologyPatagoniaLand Mammal Ageshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Cenozoic South American Land MammalAges (SALMAs) have historically beencorrelated to the geologic time scale using40Ar/39Ar dating and magnetostratigraphy.At Gran Barranca (68.7°W, 45.7°S)?one ofSouth America?s key areas for constrainingSALMAs?existing radioisotopic ages haveuncertainties of up to 4 m.y. To better constrainthe ages of mammalian assemblages,we employed high-precision (±<40 k.y.) U-Pbdating using single zircon crystals. We datednine tuffs from the Sarmiento Formationcontaining middle Eocene?early Miocenefaunas (Barrancan, Mustersan, Tinguirirican,Deseadan, Colhuehuapian, and ?Pinturan?).The new dates span from 39.861 ±0.037 Ma to 19.041 ± 0.027 Ma. The La CanchaTuff, occurring within the Tinguiriricanfaunal level yielded an age of 33.581 ± 0.015Ma, confi rming that the Vera Member containsthe only fossiliferous geologic sectionencompassing the Eocene?Oligocene transitionin the Southern Hemisphere. The pre-Deseadan fauna, La Cantera, is ≤30.77 Ma,the age of the Colhuehuapian is expanded to21.1?20.1 Ma, and the Pinturan may be asold as ca. 19 Ma.The new U-Pb dates confi rm that atmospherictemperatures and vegetationremained constant across the Eocene?Oligocene transition in Patagonia and thathypsodonty occurred in South American ungulatesmuch earlier than on any other continent.Additionally, refi nement of the SALMAboundaries will eventually provide the contextnecessary to compare faunal transitionsacross continents, although currently toomuch data are missing to allow such comparisons.Finally, the new ages provide a highresolutionage model from which hypothesesabout rates of environmental and evolutionarychange at Gran Barranca can be tested.Fil: Dunn, Regan E.. University of Washington; Estados UnidosFil: Madden, Richard H.. University of Chicago; Estados UnidosFil: Kohn, Matthew J.. Boise State University; Estados UnidosFil: Schmitz, Mark D.. Boise State University; Estados UnidosFil: Stromberg, Caroline A. E.. University of Washington; Estados UnidosFil: Carlini, Alfredo Armando. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Re, Guillermo Hector. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; ArgentinaFil: Crowley, James. Boise State University; Estados UnidosGeological Society of America2012-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241123Dunn, Regan E.; Madden, Richard H.; Kohn, Matthew J.; Schmitz, Mark D.; Stromberg, Caroline A. E.; et al.; A new chronology for middle Eocene-early Miocene South American Land Mammal Ages; Geological Society of America; Geological Society of America Bulletin; 125; 3-4; 12-2012; 539-5550016-7606CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1130/B30660.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:47Zoai:ri.conicet.gov.ar:11336/241123instacron: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:34982025-09-29 10:11:47.832CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
title A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
spellingShingle A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
Dunn, Regan E.
Eocene to Miocene
Chronology
Patagonia
Land Mammal Ages
title_short A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
title_full A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
title_fullStr A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
title_full_unstemmed A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
title_sort A new chronology for middle Eocene-early Miocene South American Land Mammal Ages
dc.creator.none.fl_str_mv Dunn, Regan E.
Madden, Richard H.
Kohn, Matthew J.
Schmitz, Mark D.
Stromberg, Caroline A. E.
Carlini, Alfredo Armando
Re, Guillermo Hector
Crowley, James
author Dunn, Regan E.
author_facet Dunn, Regan E.
Madden, Richard H.
Kohn, Matthew J.
Schmitz, Mark D.
Stromberg, Caroline A. E.
Carlini, Alfredo Armando
Re, Guillermo Hector
Crowley, James
author_role author
author2 Madden, Richard H.
Kohn, Matthew J.
Schmitz, Mark D.
Stromberg, Caroline A. E.
Carlini, Alfredo Armando
Re, Guillermo Hector
Crowley, James
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Eocene to Miocene
Chronology
Patagonia
Land Mammal Ages
topic Eocene to Miocene
Chronology
Patagonia
Land Mammal Ages
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Cenozoic South American Land MammalAges (SALMAs) have historically beencorrelated to the geologic time scale using40Ar/39Ar dating and magnetostratigraphy.At Gran Barranca (68.7°W, 45.7°S)?one ofSouth America?s key areas for constrainingSALMAs?existing radioisotopic ages haveuncertainties of up to 4 m.y. To better constrainthe ages of mammalian assemblages,we employed high-precision (±<40 k.y.) U-Pbdating using single zircon crystals. We datednine tuffs from the Sarmiento Formationcontaining middle Eocene?early Miocenefaunas (Barrancan, Mustersan, Tinguirirican,Deseadan, Colhuehuapian, and ?Pinturan?).The new dates span from 39.861 ±0.037 Ma to 19.041 ± 0.027 Ma. The La CanchaTuff, occurring within the Tinguiriricanfaunal level yielded an age of 33.581 ± 0.015Ma, confi rming that the Vera Member containsthe only fossiliferous geologic sectionencompassing the Eocene?Oligocene transitionin the Southern Hemisphere. The pre-Deseadan fauna, La Cantera, is ≤30.77 Ma,the age of the Colhuehuapian is expanded to21.1?20.1 Ma, and the Pinturan may be asold as ca. 19 Ma.The new U-Pb dates confi rm that atmospherictemperatures and vegetationremained constant across the Eocene?Oligocene transition in Patagonia and thathypsodonty occurred in South American ungulatesmuch earlier than on any other continent.Additionally, refi nement of the SALMAboundaries will eventually provide the contextnecessary to compare faunal transitionsacross continents, although currently toomuch data are missing to allow such comparisons.Finally, the new ages provide a highresolutionage model from which hypothesesabout rates of environmental and evolutionarychange at Gran Barranca can be tested.
Fil: Dunn, Regan E.. University of Washington; Estados Unidos
Fil: Madden, Richard H.. University of Chicago; Estados Unidos
Fil: Kohn, Matthew J.. Boise State University; Estados Unidos
Fil: Schmitz, Mark D.. Boise State University; Estados Unidos
Fil: Stromberg, Caroline A. E.. University of Washington; Estados Unidos
Fil: Carlini, Alfredo Armando. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Departamento Científico de Paleontología de Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Re, Guillermo Hector. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología; Argentina
Fil: Crowley, James. Boise State University; Estados Unidos
description Cenozoic South American Land MammalAges (SALMAs) have historically beencorrelated to the geologic time scale using40Ar/39Ar dating and magnetostratigraphy.At Gran Barranca (68.7°W, 45.7°S)?one ofSouth America?s key areas for constrainingSALMAs?existing radioisotopic ages haveuncertainties of up to 4 m.y. To better constrainthe ages of mammalian assemblages,we employed high-precision (±<40 k.y.) U-Pbdating using single zircon crystals. We datednine tuffs from the Sarmiento Formationcontaining middle Eocene?early Miocenefaunas (Barrancan, Mustersan, Tinguirirican,Deseadan, Colhuehuapian, and ?Pinturan?).The new dates span from 39.861 ±0.037 Ma to 19.041 ± 0.027 Ma. The La CanchaTuff, occurring within the Tinguiriricanfaunal level yielded an age of 33.581 ± 0.015Ma, confi rming that the Vera Member containsthe only fossiliferous geologic sectionencompassing the Eocene?Oligocene transitionin the Southern Hemisphere. The pre-Deseadan fauna, La Cantera, is ≤30.77 Ma,the age of the Colhuehuapian is expanded to21.1?20.1 Ma, and the Pinturan may be asold as ca. 19 Ma.The new U-Pb dates confi rm that atmospherictemperatures and vegetationremained constant across the Eocene?Oligocene transition in Patagonia and thathypsodonty occurred in South American ungulatesmuch earlier than on any other continent.Additionally, refi nement of the SALMAboundaries will eventually provide the contextnecessary to compare faunal transitionsacross continents, although currently toomuch data are missing to allow such comparisons.Finally, the new ages provide a highresolutionage model from which hypothesesabout rates of environmental and evolutionarychange at Gran Barranca can be tested.
publishDate 2012
dc.date.none.fl_str_mv 2012-12
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/11336/241123
Dunn, Regan E.; Madden, Richard H.; Kohn, Matthew J.; Schmitz, Mark D.; Stromberg, Caroline A. E.; et al.; A new chronology for middle Eocene-early Miocene South American Land Mammal Ages; Geological Society of America; Geological Society of America Bulletin; 125; 3-4; 12-2012; 539-555
0016-7606
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241123
identifier_str_mv Dunn, Regan E.; Madden, Richard H.; Kohn, Matthew J.; Schmitz, Mark D.; Stromberg, Caroline A. E.; et al.; A new chronology for middle Eocene-early Miocene South American Land Mammal Ages; Geological Society of America; Geological Society of America Bulletin; 125; 3-4; 12-2012; 539-555
0016-7606
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1130/B30660.1
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
application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
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 13.070432

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