Recalibrating the Great American Faunal Interchange

Autores
Campbell, Kenneth
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
A late Miocene gomphothere from southeastern Peru documents the earliest occurrence of a North American mammal in South America as a result of the Great American Faunal Interchange (GAFI). The gomphothere came from the Ipururo Formation, which underlies the Madre de Dios Formation and is separated from it by the Pan- Amazonian Ucayali Unconformity. The Madre de Dios Formation is dated to 9.5-3.0 Ma using 40Ar/39Ar dates on two volcanic ashes, in combination with magnetostratigraphy. The basal horizon of the Madre de Dios Formation is often fossiliferous, containing many fossil vertebrates typical of the Chasicoan (12-9 Ma) and Huayquerian (9-6 Ma) SALMAs. Also occurring in this horizon are other North American mammals, including other gomphotheres, tapirs, and two genera of extinct peccaries. The presence of this suite of North American mammals in South America in the late Miocene is recognized as the first pulse of the GAFI. Although the well-known swimming ability of elephantoids might have facilitated their very early (~10+ Ma) dispersal to South America, geologic data are now available that indicate the presence of a terrestrial pathway connecting North and South America in the late Miocene. This pathway led from central Panama, where North American mammals are found in early Miocene deposits, through mountainous terrain of the Panama-Costa Rica arc prior to this allochthonous terrain being completely sutured onto western Colombia. Late Miocene ground sloths found in North America probably traveled this route as well. Sea level fluctuations might have served to pulse interchange events until a permanent terrestrial link was established at ~5.0 Ma. That the GAFI began in earnest via terrestrial links in the late Miocene is supported by new data derived from paleontological discoveries, paleoceanographic research, and molecular divergence time estimates. The presence of such a terrestrial link has implications for many fields of scientific endeavor.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Great American Faunal Interchange
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16827

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spelling Recalibrating the Great American Faunal InterchangeCampbell, KennethCiencias NaturalesPaleontologíaGreat American Faunal InterchangeA late Miocene gomphothere from southeastern Peru documents the earliest occurrence of a North American mammal in South America as a result of the Great American Faunal Interchange (GAFI). The gomphothere came from the Ipururo Formation, which underlies the Madre de Dios Formation and is separated from it by the Pan- Amazonian Ucayali Unconformity. The Madre de Dios Formation is dated to 9.5-3.0 Ma using 40Ar/39Ar dates on two volcanic ashes, in combination with magnetostratigraphy. The basal horizon of the Madre de Dios Formation is often fossiliferous, containing many fossil vertebrates typical of the Chasicoan (12-9 Ma) and Huayquerian (9-6 Ma) SALMAs. Also occurring in this horizon are other North American mammals, including other gomphotheres, tapirs, and two genera of extinct peccaries. The presence of this suite of North American mammals in South America in the late Miocene is recognized as the first pulse of the GAFI. Although the well-known swimming ability of elephantoids might have facilitated their very early (~10+ Ma) dispersal to South America, geologic data are now available that indicate the presence of a terrestrial pathway connecting North and South America in the late Miocene. This pathway led from central Panama, where North American mammals are found in early Miocene deposits, through mountainous terrain of the Panama-Costa Rica arc prior to this allochthonous terrain being completely sutured onto western Colombia. Late Miocene ground sloths found in North America probably traveled this route as well. Sea level fluctuations might have served to pulse interchange events until a permanent terrestrial link was established at ~5.0 Ma. That the GAFI began in earnest via terrestrial links in the late Miocene is supported by new data derived from paleontological discoveries, paleoceanographic research, and molecular divergence time estimates. The presence of such a terrestrial link has implications for many fields of scientific endeavor.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16827enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:02Zoai:sedici.unlp.edu.ar:10915/16827Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:03.195SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Recalibrating the Great American Faunal Interchange
title Recalibrating the Great American Faunal Interchange
spellingShingle Recalibrating the Great American Faunal Interchange
Campbell, Kenneth
Ciencias Naturales
Paleontología
Great American Faunal Interchange
title_short Recalibrating the Great American Faunal Interchange
title_full Recalibrating the Great American Faunal Interchange
title_fullStr Recalibrating the Great American Faunal Interchange
title_full_unstemmed Recalibrating the Great American Faunal Interchange
title_sort Recalibrating the Great American Faunal Interchange
dc.creator.none.fl_str_mv Campbell, Kenneth
author Campbell, Kenneth
author_facet Campbell, Kenneth
author_role author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Great American Faunal Interchange
topic Ciencias Naturales
Paleontología
Great American Faunal Interchange
dc.description.none.fl_txt_mv A late Miocene gomphothere from southeastern Peru documents the earliest occurrence of a North American mammal in South America as a result of the Great American Faunal Interchange (GAFI). The gomphothere came from the Ipururo Formation, which underlies the Madre de Dios Formation and is separated from it by the Pan- Amazonian Ucayali Unconformity. The Madre de Dios Formation is dated to 9.5-3.0 Ma using 40Ar/39Ar dates on two volcanic ashes, in combination with magnetostratigraphy. The basal horizon of the Madre de Dios Formation is often fossiliferous, containing many fossil vertebrates typical of the Chasicoan (12-9 Ma) and Huayquerian (9-6 Ma) SALMAs. Also occurring in this horizon are other North American mammals, including other gomphotheres, tapirs, and two genera of extinct peccaries. The presence of this suite of North American mammals in South America in the late Miocene is recognized as the first pulse of the GAFI. Although the well-known swimming ability of elephantoids might have facilitated their very early (~10+ Ma) dispersal to South America, geologic data are now available that indicate the presence of a terrestrial pathway connecting North and South America in the late Miocene. This pathway led from central Panama, where North American mammals are found in early Miocene deposits, through mountainous terrain of the Panama-Costa Rica arc prior to this allochthonous terrain being completely sutured onto western Colombia. Late Miocene ground sloths found in North America probably traveled this route as well. Sea level fluctuations might have served to pulse interchange events until a permanent terrestrial link was established at ~5.0 Ma. That the GAFI began in earnest via terrestrial links in the late Miocene is supported by new data derived from paleontological discoveries, paleoceanographic research, and molecular divergence time estimates. The presence of such a terrestrial link has implications for many fields of scientific endeavor.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description A late Miocene gomphothere from southeastern Peru documents the earliest occurrence of a North American mammal in South America as a result of the Great American Faunal Interchange (GAFI). The gomphothere came from the Ipururo Formation, which underlies the Madre de Dios Formation and is separated from it by the Pan- Amazonian Ucayali Unconformity. The Madre de Dios Formation is dated to 9.5-3.0 Ma using 40Ar/39Ar dates on two volcanic ashes, in combination with magnetostratigraphy. The basal horizon of the Madre de Dios Formation is often fossiliferous, containing many fossil vertebrates typical of the Chasicoan (12-9 Ma) and Huayquerian (9-6 Ma) SALMAs. Also occurring in this horizon are other North American mammals, including other gomphotheres, tapirs, and two genera of extinct peccaries. The presence of this suite of North American mammals in South America in the late Miocene is recognized as the first pulse of the GAFI. Although the well-known swimming ability of elephantoids might have facilitated their very early (~10+ Ma) dispersal to South America, geologic data are now available that indicate the presence of a terrestrial pathway connecting North and South America in the late Miocene. This pathway led from central Panama, where North American mammals are found in early Miocene deposits, through mountainous terrain of the Panama-Costa Rica arc prior to this allochthonous terrain being completely sutured onto western Colombia. Late Miocene ground sloths found in North America probably traveled this route as well. Sea level fluctuations might have served to pulse interchange events until a permanent terrestrial link was established at ~5.0 Ma. That the GAFI began in earnest via terrestrial links in the late Miocene is supported by new data derived from paleontological discoveries, paleoceanographic research, and molecular divergence time estimates. The presence of such a terrestrial link has implications for many fields of scientific endeavor.
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