New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting
Renewed field work in the Beardmore Glacier region of Antarctica has led to a new collection of tetrapod fossils from the upper member of the Fremouw Formation near Fremouw Peak. This locality records a sedimentary environment remarkably similar to that preserved at Gordon Valley, the only other loc...
Published in: | Journal of Vertebrate Paleontology |
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ftbioone:10.1080/02724634.2014.837472 2024-06-02T07:57:15+00:00 New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook world 2014-07-01 text/HTML https://doi.org/10.1080/02724634.2014.837472 en eng The Society of Vertebrate Paleontology doi:10.1080/02724634.2014.837472 All rights reserved. https://doi.org/10.1080/02724634.2014.837472 Text 2014 ftbioone https://doi.org/10.1080/02724634.2014.837472 2024-05-07T00:50:56Z Renewed field work in the Beardmore Glacier region of Antarctica has led to a new collection of tetrapod fossils from the upper member of the Fremouw Formation near Fremouw Peak. This locality records a sedimentary environment remarkably similar to that preserved at Gordon Valley, the only other locality known to preserve Cynognathus Assemblage Zone—equivalent taxa from Antarctica. Fossil bones are generally disarticulated and mixed with logs and reworked mudrock clasts, forming an intraformational channel-lag conglomerate. To date, very few bones of small-bodied taxa have been recovered from the upper Fremouw conglomerates, suggesting that they did not survive the reworking process. We use an apomorphy-based approach to record three previously unrecognized taxa from the upper Fremouw Formation: the dicynodont Angonisaurus, an indeterminate therocephalian therapsid, and an indeterminate crown-group archosaur. Combined with previous data, our work demonstrates that 10 distinct taxa can be recognized from the upper Fremouw, including two endemic temnospondyl species. Our recognition of Angonisaurus in the upper Fremouw Formation provides a new piece of evidence in favor of a correlation with the Cynognathus C subzone (uppermost Burgersdorp Formation) of South Africa and the Lifua Member of the Manda beds of Tanzania. Text Antarc* Antarctica Beardmore Glacier BioOne Online Journals Beardmore ENVELOPE(174.900,174.900,-83.350,-83.350) Beardmore Glacier ENVELOPE(170.000,170.000,-84.500,-84.500) Gordon Valley ENVELOPE(164.000,164.000,-84.383,-84.383) Fremouw Peak ENVELOPE(164.333,164.333,-84.283,-84.283) Journal of Vertebrate Paleontology 34 4 793 801 |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
Renewed field work in the Beardmore Glacier region of Antarctica has led to a new collection of tetrapod fossils from the upper member of the Fremouw Formation near Fremouw Peak. This locality records a sedimentary environment remarkably similar to that preserved at Gordon Valley, the only other locality known to preserve Cynognathus Assemblage Zone—equivalent taxa from Antarctica. Fossil bones are generally disarticulated and mixed with logs and reworked mudrock clasts, forming an intraformational channel-lag conglomerate. To date, very few bones of small-bodied taxa have been recovered from the upper Fremouw conglomerates, suggesting that they did not survive the reworking process. We use an apomorphy-based approach to record three previously unrecognized taxa from the upper Fremouw Formation: the dicynodont Angonisaurus, an indeterminate therocephalian therapsid, and an indeterminate crown-group archosaur. Combined with previous data, our work demonstrates that 10 distinct taxa can be recognized from the upper Fremouw, including two endemic temnospondyl species. Our recognition of Angonisaurus in the upper Fremouw Formation provides a new piece of evidence in favor of a correlation with the Cynognathus C subzone (uppermost Burgersdorp Formation) of South Africa and the Lifua Member of the Manda beds of Tanzania. |
author2 |
Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook |
format |
Text |
author |
Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook |
spellingShingle |
Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
author_facet |
Christian A. Sidor Roger M. H. Smith Adam K. Huttenlocker Brandon R. Peecook |
author_sort |
Christian A. Sidor |
title |
New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
title_short |
New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
title_full |
New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
title_fullStr |
New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
title_full_unstemmed |
New Middle Triassic Tetrapods from the Upper Fremouw Formation of Antarctica and Their Depositional Setting |
title_sort |
new middle triassic tetrapods from the upper fremouw formation of antarctica and their depositional setting |
publisher |
The Society of Vertebrate Paleontology |
publishDate |
2014 |
url |
https://doi.org/10.1080/02724634.2014.837472 |
op_coverage |
world |
long_lat |
ENVELOPE(174.900,174.900,-83.350,-83.350) ENVELOPE(170.000,170.000,-84.500,-84.500) ENVELOPE(164.000,164.000,-84.383,-84.383) ENVELOPE(164.333,164.333,-84.283,-84.283) |
geographic |
Beardmore Beardmore Glacier Gordon Valley Fremouw Peak |
geographic_facet |
Beardmore Beardmore Glacier Gordon Valley Fremouw Peak |
genre |
Antarc* Antarctica Beardmore Glacier |
genre_facet |
Antarc* Antarctica Beardmore Glacier |
op_source |
https://doi.org/10.1080/02724634.2014.837472 |
op_relation |
doi:10.1080/02724634.2014.837472 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/02724634.2014.837472 |
container_title |
Journal of Vertebrate Paleontology |
container_volume |
34 |
container_issue |
4 |
container_start_page |
793 |
op_container_end_page |
801 |
_version_ |
1800740298214604800 |