The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island
New fossil mammals found at the base of Acantilados II Allomember of the La Meseta Formation, from the early Eocene (Ypresian) of Seymour Island, represent the oldest evidence of this group in Antarctica. Two specimens are here described; the first belongs to a talonid portion of a lower right molar...
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/119193 2023-05-15T13:43:37+02:00 The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island Gelfo, Javier Nicolás Mörs, Thomas Lorente, Malena López, Guillermo Marcos Reguero, Marcelo Alfredo 2015 application/pdf 101-110 http://sedici.unlp.edu.ar/handle/10915/119193 en eng http://sedici.unlp.edu.ar/handle/10915/119193 issn:1475-4983 http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) CC-BY-NC Paleontología West Antarctica Palaeogene Ypresian Tooth and bone morphology Ungulates Sparnotheriodontidae Articulo 2015 ftunivlaplata 2021-05-23T00:05:09Z New fossil mammals found at the base of Acantilados II Allomember of the La Meseta Formation, from the early Eocene (Ypresian) of Seymour Island, represent the oldest evidence of this group in Antarctica. Two specimens are here described; the first belongs to a talonid portion of a lower right molar assigned to the sparnotheriodontid litoptern Notiolofos sp. cf. N. arquinotiensis. Sparnotheriodontid were medium- to large-sized ungulates, with a wide distribution in the Eocene of South America and Antarctica. The second specimen is an intermediate phalanx referred to an indeterminate Eutheria, probably a South American native ungulate. These Antarctic findings in sediments of 55.3 Ma query the minimum age needed for terrestrial mammals to spread from South America to Antarctica, which should have occurred before the final break-up of Gondwana. This event involves the disappearance of the land bridge formed by the Weddellian Isthmus, which connected West Antarctica and southern South America from the Late Cretaceous until sometime in the earliest Palaeogene. Facultad de Ciencias Naturales y Museo Article in Journal/Newspaper Antarc* Antarctic Antarctica Seymour Island West Antarctica Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Antarctic Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) West Antarctica |
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 West Antarctica Palaeogene Ypresian Tooth and bone morphology Ungulates Sparnotheriodontidae |
spellingShingle |
Paleontología West Antarctica Palaeogene Ypresian Tooth and bone morphology Ungulates Sparnotheriodontidae Gelfo, Javier Nicolás Mörs, Thomas Lorente, Malena López, Guillermo Marcos Reguero, Marcelo Alfredo The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
topic_facet |
Paleontología West Antarctica Palaeogene Ypresian Tooth and bone morphology Ungulates Sparnotheriodontidae |
description |
New fossil mammals found at the base of Acantilados II Allomember of the La Meseta Formation, from the early Eocene (Ypresian) of Seymour Island, represent the oldest evidence of this group in Antarctica. Two specimens are here described; the first belongs to a talonid portion of a lower right molar assigned to the sparnotheriodontid litoptern Notiolofos sp. cf. N. arquinotiensis. Sparnotheriodontid were medium- to large-sized ungulates, with a wide distribution in the Eocene of South America and Antarctica. The second specimen is an intermediate phalanx referred to an indeterminate Eutheria, probably a South American native ungulate. These Antarctic findings in sediments of 55.3 Ma query the minimum age needed for terrestrial mammals to spread from South America to Antarctica, which should have occurred before the final break-up of Gondwana. This event involves the disappearance of the land bridge formed by the Weddellian Isthmus, which connected West Antarctica and southern South America from the Late Cretaceous until sometime in the earliest Palaeogene. Facultad de Ciencias Naturales y Museo |
format |
Article in Journal/Newspaper |
author |
Gelfo, Javier Nicolás Mörs, Thomas Lorente, Malena López, Guillermo Marcos Reguero, Marcelo Alfredo |
author_facet |
Gelfo, Javier Nicolás Mörs, Thomas Lorente, Malena López, Guillermo Marcos Reguero, Marcelo Alfredo |
author_sort |
Gelfo, Javier Nicolás |
title |
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
title_short |
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
title_full |
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
title_fullStr |
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
title_full_unstemmed |
The oldest mammals from Antarctica, early Eocene of the La Meseta Formation, Seymour Island |
title_sort |
oldest mammals from antarctica, early eocene of the la meseta formation, seymour island |
publishDate |
2015 |
url |
http://sedici.unlp.edu.ar/handle/10915/119193 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Seymour Seymour Island West Antarctica |
geographic_facet |
Antarctic Seymour Seymour Island West Antarctica |
genre |
Antarc* Antarctic Antarctica Seymour Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Seymour Island West Antarctica |
op_relation |
http://sedici.unlp.edu.ar/handle/10915/119193 issn:1475-4983 |
op_rights |
http://creativecommons.org/licenses/by-nc/4.0/ Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) |
op_rightsnorm |
CC-BY-NC |
_version_ |
1766191217152884736 |