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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Autores principales: 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
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Paleontología
Paleogene
Patagonia
SALMA
La Meseta
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138889
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138889
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
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.
format Articulo
Articulo
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
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