Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula
Palynological results from opposite sides of the northernmost Antarctic Peninsula provide insight on terrestrial vegetation and sea-surface conditions immediately before the Eocene–Oligocene transition (EOT), through Early Oligocene glacial conditions and the subsequent Late Oligocene interglacial i...
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ftbioone:10.1080/01916122.2017.1418444 2024-06-02T07:57:53+00:00 Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur world 2019-02-01 text/HTML https://doi.org/10.1080/01916122.2017.1418444 en eng AASP: The Palynological Society doi:10.1080/01916122.2017.1418444 All rights reserved. https://doi.org/10.1080/01916122.2017.1418444 Text 2019 ftbioone https://doi.org/10.1080/01916122.2017.1418444 2024-05-07T00:50:35Z Palynological results from opposite sides of the northernmost Antarctic Peninsula provide insight on terrestrial vegetation and sea-surface conditions immediately before the Eocene–Oligocene transition (EOT), through Early Oligocene glacial conditions and the subsequent Late Oligocene interglacial interval. A latest Eocene sample set from the uppermost La Meseta Formation on Seymour Island, James Ross (back-arc) Basin, records a low-diversity Nothofagus (southern beech)-dominated vegetation with some podocarp conifers similar to Valdivian-type forest found today in Chile and Argentina. Marine organicwalled phytoplankton include leiospheres and Eocene dinoflagellate cysts such as Vozzhennikovia rotunda, V. apertura, Senegalinium asymmetricum and Spinidinium macmurdoense. Immediately before the EOT near the top of the section the decrease in terrestrial palynomorphs, increase in reworked specimens, disappearance of key dinocysts, and overwhelming numbers of sea-ice-indicative leiospheres plus the small dinoflagellate cyst Impletosphaeridium signal the onset of glacial conditions in a subpolar climate. Early to Late Oligocene samples from the Polonez Cove and Boy Point formations on King George Island, South Shetland Islands (magmatic arc), yielded an extremely depauperate terrestrial flora, likely resulting in part from poor vegetation cover during the Polonez Glaciation but also because of destruction of vegetation due to continued regional volcanism. The prevalence of sea-ice-indicative leiospheres in the marine palynomorph component is consistent with polar to subpolar conditions during and following the Polonez Glaciation. Text Antarc* Antarctic Antarctic Peninsula King George Island Sea ice Seymour Island South Shetland Islands BioOne Online Journals Antarctic The Antarctic Antarctic Peninsula King George Island South Shetland Islands Argentina Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Rotunda ENVELOPE(161.567,161.567,-78.017,-78.017) Polonez Cove ENVELOPE(-58.131,-58.131,-62.153,-62.153) Boy Point ENVELOPE(-58.171,-58.171,-62.164,-62.164) Palynology 43 1 4 21 |
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Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
description |
Palynological results from opposite sides of the northernmost Antarctic Peninsula provide insight on terrestrial vegetation and sea-surface conditions immediately before the Eocene–Oligocene transition (EOT), through Early Oligocene glacial conditions and the subsequent Late Oligocene interglacial interval. A latest Eocene sample set from the uppermost La Meseta Formation on Seymour Island, James Ross (back-arc) Basin, records a low-diversity Nothofagus (southern beech)-dominated vegetation with some podocarp conifers similar to Valdivian-type forest found today in Chile and Argentina. Marine organicwalled phytoplankton include leiospheres and Eocene dinoflagellate cysts such as Vozzhennikovia rotunda, V. apertura, Senegalinium asymmetricum and Spinidinium macmurdoense. Immediately before the EOT near the top of the section the decrease in terrestrial palynomorphs, increase in reworked specimens, disappearance of key dinocysts, and overwhelming numbers of sea-ice-indicative leiospheres plus the small dinoflagellate cyst Impletosphaeridium signal the onset of glacial conditions in a subpolar climate. Early to Late Oligocene samples from the Polonez Cove and Boy Point formations on King George Island, South Shetland Islands (magmatic arc), yielded an extremely depauperate terrestrial flora, likely resulting in part from poor vegetation cover during the Polonez Glaciation but also because of destruction of vegetation due to continued regional volcanism. The prevalence of sea-ice-indicative leiospheres in the marine palynomorph component is consistent with polar to subpolar conditions during and following the Polonez Glaciation. |
author2 |
Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur |
format |
Text |
author |
Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur |
spellingShingle |
Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
author_facet |
Sophie Warny C. Madison Kymes Rosemary Askin Krzysztof P. Krajewski Andrzej Tatur |
author_sort |
Sophie Warny |
title |
Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
title_short |
Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
title_full |
Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
title_fullStr |
Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
title_full_unstemmed |
Terrestrial and Marine Floral Response to Latest Eocene and Oligocene Events on the Antarctic Peninsula |
title_sort |
terrestrial and marine floral response to latest eocene and oligocene events on the antarctic peninsula |
publisher |
AASP: The Palynological Society |
publishDate |
2019 |
url |
https://doi.org/10.1080/01916122.2017.1418444 |
op_coverage |
world |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(161.567,161.567,-78.017,-78.017) ENVELOPE(-58.131,-58.131,-62.153,-62.153) ENVELOPE(-58.171,-58.171,-62.164,-62.164) |
geographic |
Antarctic The Antarctic Antarctic Peninsula King George Island South Shetland Islands Argentina Seymour Seymour Island Rotunda Polonez Cove Boy Point |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula King George Island South Shetland Islands Argentina Seymour Seymour Island Rotunda Polonez Cove Boy Point |
genre |
Antarc* Antarctic Antarctic Peninsula King George Island Sea ice Seymour Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula King George Island Sea ice Seymour Island South Shetland Islands |
op_source |
https://doi.org/10.1080/01916122.2017.1418444 |
op_relation |
doi:10.1080/01916122.2017.1418444 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/01916122.2017.1418444 |
container_title |
Palynology |
container_volume |
43 |
container_issue |
1 |
container_start_page |
4 |
op_container_end_page |
21 |
_version_ |
1800741110001172480 |