A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications
Abstract Our knowledge of the foraminiferal fossil record of Antarctica is notoriously patchy but still offers us an overview of its Cenozoic faunas. Few occurrences have been reported for the continent, with deep-sea assemblages described mainly for its eastern portion. Here we describe 21 taxa of...
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Online Access: | http://dx.doi.org/10.1017/jpa.2021.120 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336021001207 |
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crcambridgeupr:10.1017/jpa.2021.120 2024-03-03T08:37:46+00:00 A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications Badaró, Victor C.S. Petri, Setembrino Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Conselho Nacional de Desenvolvimento Científico e Tecnológico 2022 http://dx.doi.org/10.1017/jpa.2021.120 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336021001207 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Paleontology volume 96, issue 3, page 493-512 ISSN 0022-3360 1937-2337 Paleontology journal-article 2022 crcambridgeupr https://doi.org/10.1017/jpa.2021.120 2024-02-08T08:34:46Z Abstract Our knowledge of the foraminiferal fossil record of Antarctica is notoriously patchy but still offers us an overview of its Cenozoic faunas. Few occurrences have been reported for the continent, with deep-sea assemblages described mainly for its eastern portion. Here we describe 21 taxa of large agglutinated foraminifers from the Miocene Hobbs Glacier Formation and the Plio-Pleistocene Weddell Sea Formation on Seymour Island, West Antarctica, including the gigantic Ammodiscus vastus new species. Most of them consist of genera or species typical of deep-sea agglutinated assemblages. All specimens are completely filled and partially covered by lithified micrite. This, along with the postfill fragmentation of some tests, indicates their re-elaboration from older deposits. Because all of these foraminifers share the same taphonomic features and most of them represent taxa associated with deep-sea settings, they probably represent a flysch-type assemblage from an unknown deposit that was eroded and had its microfossils scattered through post-Paleogene sediments. A Paleocene age for this putative assemblage is indicated by the presence of Reticulophragmiun garcilassoi (Frizzell, 1943), a Paleocene index fossil, and by its association with the Cretaceous–Paleocene Ammodiscus pennyi Cushman and Jarvis, 1928. If taken as a coherent foraminiferal assemblage, it represents one of the few deep-sea assemblages known for West Antarctica, and the first flysch-type assemblage recognized for the Antarctic Cenozoic. In addition, it would show that the Paleocene foraminiferal communities of the West Antarctica's deep-sea floor were more like their Pacific counterparts than their Atlantic equivalents. UUID: http://zoobank.org/0d281489-c0c6-47b4-9884-f820806485b7 Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Weddell Sea West Antarctica Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Weddell Sea West Antarctica Pacific Weddell Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Hobbs ENVELOPE(-57.500,-57.500,-64.300,-64.300) Journal of Paleontology 1 20 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Paleontology |
spellingShingle |
Paleontology Badaró, Victor C.S. Petri, Setembrino A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
topic_facet |
Paleontology |
description |
Abstract Our knowledge of the foraminiferal fossil record of Antarctica is notoriously patchy but still offers us an overview of its Cenozoic faunas. Few occurrences have been reported for the continent, with deep-sea assemblages described mainly for its eastern portion. Here we describe 21 taxa of large agglutinated foraminifers from the Miocene Hobbs Glacier Formation and the Plio-Pleistocene Weddell Sea Formation on Seymour Island, West Antarctica, including the gigantic Ammodiscus vastus new species. Most of them consist of genera or species typical of deep-sea agglutinated assemblages. All specimens are completely filled and partially covered by lithified micrite. This, along with the postfill fragmentation of some tests, indicates their re-elaboration from older deposits. Because all of these foraminifers share the same taphonomic features and most of them represent taxa associated with deep-sea settings, they probably represent a flysch-type assemblage from an unknown deposit that was eroded and had its microfossils scattered through post-Paleogene sediments. A Paleocene age for this putative assemblage is indicated by the presence of Reticulophragmiun garcilassoi (Frizzell, 1943), a Paleocene index fossil, and by its association with the Cretaceous–Paleocene Ammodiscus pennyi Cushman and Jarvis, 1928. If taken as a coherent foraminiferal assemblage, it represents one of the few deep-sea assemblages known for West Antarctica, and the first flysch-type assemblage recognized for the Antarctic Cenozoic. In addition, it would show that the Paleocene foraminiferal communities of the West Antarctica's deep-sea floor were more like their Pacific counterparts than their Atlantic equivalents. UUID: http://zoobank.org/0d281489-c0c6-47b4-9884-f820806485b7 |
author2 |
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Conselho Nacional de Desenvolvimento Científico e Tecnológico |
format |
Article in Journal/Newspaper |
author |
Badaró, Victor C.S. Petri, Setembrino |
author_facet |
Badaró, Victor C.S. Petri, Setembrino |
author_sort |
Badaró, Victor C.S. |
title |
A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
title_short |
A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
title_full |
A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
title_fullStr |
A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
title_full_unstemmed |
A deep-sea foraminiferal assemblage scattered through the late Cenozoic of Antarctic Peninsula and its biostratigraphic and biogeographic implications |
title_sort |
deep-sea foraminiferal assemblage scattered through the late cenozoic of antarctic peninsula and its biostratigraphic and biogeographic implications |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jpa.2021.120 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022336021001207 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-57.500,-57.500,-64.300,-64.300) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea West Antarctica Pacific Weddell Seymour Seymour Island Hobbs |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea West Antarctica Pacific Weddell Seymour Seymour Island Hobbs |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island Weddell Sea West Antarctica |
op_source |
Journal of Paleontology volume 96, issue 3, page 493-512 ISSN 0022-3360 1937-2337 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/jpa.2021.120 |
container_title |
Journal of Paleontology |
container_start_page |
1 |
op_container_end_page |
20 |
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1792501426092507136 |