Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica
The Permian–Triassic boundary within the Amery Group of the Lambert Graben is placed at the contact between the Bainmedart Coal Measures and overlying Flagstone Bench Formation, based on the first regular occurrence of Lunatisporites pellucidus and the first appearance of Aratrisporites and Lepidopt...
Published in: | Antarctic Science |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1997
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102097000370 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000370 |
id |
crcambridgeupr:10.1017/s0954102097000370 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102097000370 2024-06-23T07:46:03+00:00 Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica McLoughlin, Stephen Lindström, Sofie Drinnan, Andrew N. 1997 http://dx.doi.org/10.1017/s0954102097000370 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000370 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 9, issue 3, page 281-298 ISSN 0954-1020 1365-2079 journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0954102097000370 2024-06-12T04:03:18Z The Permian–Triassic boundary within the Amery Group of the Lambert Graben is placed at the contact between the Bainmedart Coal Measures and overlying Flagstone Bench Formation, based on the first regular occurrence of Lunatisporites pellucidus and the first appearance of Aratrisporites and Lepidopteris species. The Permian-Triassic boundary is marked by the extinction of glossopterid and cordaitalean gymnosperms, and by the disappearance or extreme decline of a range of gymnospermous and pteridophytic palynomorph groups. Earliest Triassic macrofloras and palynofloras of the Flagstone Bench Formation are dominated by peltasperms and lycophytes; corystosperms, conifers, and ferns become increasingly common elements of assemblages through the Lower Triassic part of the formation and dominate floras of the Upper Triassic strata. The sedimentary transition across this boundary is conformable but marked by a termination of coal deposits; overlying lowermost Triassic sediments contain only carbonaceous siltstones. Typical red-bed facies are not developed until at least 100 m above the base of the Flagstone Bench Formation, in strata containing ?Middle Triassic palynofloras. Across Gondwana the diachronous disappearance of coal deposits and appearance of red-beds is suggestive of a response to shifting climatic belts, resulting in progressively drier seasonal conditions at successively higher palaeolatitudes during the Late Permian to Middle Triassic. The abrupt and approximately synchronous replacement of plant groups at the Permian–Triassic boundary suggests that factors independent of, or additional to, climate change were responsible for the turnover in terresrtial floras. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains Cambridge University Press Amery ENVELOPE(-94.063,-94.063,56.565,56.565) East Antarctica Flagstone Bench ENVELOPE(68.178,68.178,-70.844,-70.844) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Antarctic Science 9 3 281 298 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
The Permian–Triassic boundary within the Amery Group of the Lambert Graben is placed at the contact between the Bainmedart Coal Measures and overlying Flagstone Bench Formation, based on the first regular occurrence of Lunatisporites pellucidus and the first appearance of Aratrisporites and Lepidopteris species. The Permian-Triassic boundary is marked by the extinction of glossopterid and cordaitalean gymnosperms, and by the disappearance or extreme decline of a range of gymnospermous and pteridophytic palynomorph groups. Earliest Triassic macrofloras and palynofloras of the Flagstone Bench Formation are dominated by peltasperms and lycophytes; corystosperms, conifers, and ferns become increasingly common elements of assemblages through the Lower Triassic part of the formation and dominate floras of the Upper Triassic strata. The sedimentary transition across this boundary is conformable but marked by a termination of coal deposits; overlying lowermost Triassic sediments contain only carbonaceous siltstones. Typical red-bed facies are not developed until at least 100 m above the base of the Flagstone Bench Formation, in strata containing ?Middle Triassic palynofloras. Across Gondwana the diachronous disappearance of coal deposits and appearance of red-beds is suggestive of a response to shifting climatic belts, resulting in progressively drier seasonal conditions at successively higher palaeolatitudes during the Late Permian to Middle Triassic. The abrupt and approximately synchronous replacement of plant groups at the Permian–Triassic boundary suggests that factors independent of, or additional to, climate change were responsible for the turnover in terresrtial floras. |
format |
Article in Journal/Newspaper |
author |
McLoughlin, Stephen Lindström, Sofie Drinnan, Andrew N. |
spellingShingle |
McLoughlin, Stephen Lindström, Sofie Drinnan, Andrew N. Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
author_facet |
McLoughlin, Stephen Lindström, Sofie Drinnan, Andrew N. |
author_sort |
McLoughlin, Stephen |
title |
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
title_short |
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
title_full |
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
title_fullStr |
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica |
title_sort |
gondwanan floristic and sedimentological trends during the permian–triassic transition: new evidence from the amery group, northern prince charles mountains, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0954102097000370 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000370 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(68.178,68.178,-70.844,-70.844) ENVELOPE(67.246,67.246,-71.427,-71.427) |
geographic |
Amery East Antarctica Flagstone Bench Prince Charles Mountains |
geographic_facet |
Amery East Antarctica Flagstone Bench Prince Charles Mountains |
genre |
Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica Prince Charles Mountains |
op_source |
Antarctic Science volume 9, issue 3, page 281-298 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102097000370 |
container_title |
Antarctic Science |
container_volume |
9 |
container_issue |
3 |
container_start_page |
281 |
op_container_end_page |
298 |
_version_ |
1802643665447813120 |