New Early Eocene Mammalian Fauna from Western Patagonia, Argentina
Two new fossil mammal localities from the Paleogene of central-western Patagonia are preliminarily described as the basis for a new possible biochronological unit for the early Eocene of Patagonia, correlated as being between two conventional SALMAs, the Riochican (older) and the Vacan subage of the...
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/138889 2023-05-15T14:01:53+02:00 New Early Eocene Mammalian Fauna from Western Patagonia, Argentina Tejedor, Marcelo Fabián Goin, Francisco Javier Gelfo, Javier Nicolás López, Guillermo Marcos Bond, Mariano Carlini, Alfredo Armando Scillato Yané, Gustavo Juan Woodburne, Michael O. Chornogubsky, Laura Aragón, Eugenio Reguero, Marcelo Alfredo Czaplewski, Nicholas J. Vincon, Sergio Martín, Gabriel Mario Ciancio, Martín Ricardo 2009-03-31 application/pdf 1-43 http://sedici.unlp.edu.ar/handle/10915/138889 en eng http://sedici.unlp.edu.ar/handle/10915/138889 issn:0003-0082 issn:1937-352x http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) CC-BY Paleontología Paleogene Patagonia SALMA La Meseta Articulo 2009 ftunivlaplata 2022-07-10T00:06:32Z Two new fossil mammal localities from the Paleogene of central-western Patagonia are preliminarily described as the basis for a new possible biochronological unit for the early Eocene of Patagonia, correlated as being between two conventional SALMAs, the Riochican (older) and the Vacan subage of the Casamayoran SALMA. The mammal-bearing strata belong to the Middle Chubut River Volcanic-Pyroclastic Complex (northwestern Chubut Province, Argentina), of Paleocene-Eocene age. This complex includes a variety of volcaniclastic, intrusive, pyroclastic, and extrusive rocks deposited after the K-T boundary. Geochronological data taken from nearby volcanic deposits that underlie and overlie the mammal-bearing levels indicate that both faunas are of late early Eocene age (Ypresian-Lutetian boundary). In addition to more than 50 species of mammals, including marsupials, ungulates, and xenarthrans, two lower molars are the oldest evidence of bats in South America. Paleobotanical and palynological evidence from inferred contemporary localities nearby indicate subtropical environments characterized by warm and probably moderately humid climate. Remarkably, this new fauna is tentatively correlated with Eocene mammals from the La Meseta Formation in the Antarctic Peninsula. We conclude that the two localities mentioned above are part of a possible new biochronological unit, but the formal proposal of a new SALMA awaits completion of taxonomic analysis of the materials reported upon here. If the La Meseta fauna is correlated biochronologically to western Patagonia, this also suggests a continental extension of the biogeographic Weddelian Province as far north as central-western Patagonia. Facultad de Ciencias Naturales y Museo Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Antarctic Antarctic Peninsula Argentina Chubut ENVELOPE(-62.533,-62.533,-76.100,-76.100) Patagonia Salma ENVELOPE(32.133,32.133,65.817,65.817) The Antarctic |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
op_collection_id |
ftunivlaplata |
language |
English |
topic |
Paleontología Paleogene Patagonia SALMA La Meseta |
spellingShingle |
Paleontología Paleogene Patagonia SALMA La Meseta Tejedor, Marcelo Fabián Goin, Francisco Javier Gelfo, Javier Nicolás López, Guillermo Marcos Bond, Mariano Carlini, Alfredo Armando Scillato Yané, Gustavo Juan Woodburne, Michael O. Chornogubsky, Laura Aragón, Eugenio Reguero, Marcelo Alfredo Czaplewski, Nicholas J. Vincon, Sergio Martín, Gabriel Mario Ciancio, Martín Ricardo New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
topic_facet |
Paleontología Paleogene Patagonia SALMA La Meseta |
description |
Two new fossil mammal localities from the Paleogene of central-western Patagonia are preliminarily described as the basis for a new possible biochronological unit for the early Eocene of Patagonia, correlated as being between two conventional SALMAs, the Riochican (older) and the Vacan subage of the Casamayoran SALMA. The mammal-bearing strata belong to the Middle Chubut River Volcanic-Pyroclastic Complex (northwestern Chubut Province, Argentina), of Paleocene-Eocene age. This complex includes a variety of volcaniclastic, intrusive, pyroclastic, and extrusive rocks deposited after the K-T boundary. Geochronological data taken from nearby volcanic deposits that underlie and overlie the mammal-bearing levels indicate that both faunas are of late early Eocene age (Ypresian-Lutetian boundary). In addition to more than 50 species of mammals, including marsupials, ungulates, and xenarthrans, two lower molars are the oldest evidence of bats in South America. Paleobotanical and palynological evidence from inferred contemporary localities nearby indicate subtropical environments characterized by warm and probably moderately humid climate. Remarkably, this new fauna is tentatively correlated with Eocene mammals from the La Meseta Formation in the Antarctic Peninsula. We conclude that the two localities mentioned above are part of a possible new biochronological unit, but the formal proposal of a new SALMA awaits completion of taxonomic analysis of the materials reported upon here. If the La Meseta fauna is correlated biochronologically to western Patagonia, this also suggests a continental extension of the biogeographic Weddelian Province as far north as central-western Patagonia. Facultad de Ciencias Naturales y Museo |
format |
Article in Journal/Newspaper |
author |
Tejedor, Marcelo Fabián Goin, Francisco Javier Gelfo, Javier Nicolás López, Guillermo Marcos Bond, Mariano Carlini, Alfredo Armando Scillato Yané, Gustavo Juan Woodburne, Michael O. Chornogubsky, Laura Aragón, Eugenio Reguero, Marcelo Alfredo Czaplewski, Nicholas J. Vincon, Sergio Martín, Gabriel Mario Ciancio, Martín Ricardo |
author_facet |
Tejedor, Marcelo Fabián Goin, Francisco Javier Gelfo, Javier Nicolás López, Guillermo Marcos Bond, Mariano Carlini, Alfredo Armando Scillato Yané, Gustavo Juan Woodburne, Michael O. Chornogubsky, Laura Aragón, Eugenio Reguero, Marcelo Alfredo Czaplewski, Nicholas J. Vincon, Sergio Martín, Gabriel Mario Ciancio, Martín Ricardo |
author_sort |
Tejedor, Marcelo Fabián |
title |
New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
title_short |
New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
title_full |
New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
title_fullStr |
New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
title_full_unstemmed |
New Early Eocene Mammalian Fauna from Western Patagonia, Argentina |
title_sort |
new early eocene mammalian fauna from western patagonia, argentina |
publishDate |
2009 |
url |
http://sedici.unlp.edu.ar/handle/10915/138889 |
long_lat |
ENVELOPE(-62.533,-62.533,-76.100,-76.100) ENVELOPE(32.133,32.133,65.817,65.817) |
geographic |
Antarctic Antarctic Peninsula Argentina Chubut Patagonia Salma The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Argentina Chubut Patagonia Salma The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
http://sedici.unlp.edu.ar/handle/10915/138889 issn:0003-0082 issn:1937-352x |
op_rights |
http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
op_rightsnorm |
CC-BY |
_version_ |
1766271944554971136 |