The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
The origin of many lophotrochozoan groups can be traced to “small shelly fossil” (SSF) faunas of the Early Cambrian. Antarctica is a key region of study, due to the continent’s known close geographical proximity to well-studied Australian and Indian basins in in the Cambrian. Few studies have focuse...
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Uppsala universitet, Paleobiologi
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ftuppsalauniv:oai:DiVA.org:uu-252137 2023-05-15T13:37:43+02:00 The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica Bassett-Butt, Lewis 2015 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252137 eng eng Uppsala universitet, Paleobiologi Uppsala http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252137 info:eu-repo/semantics/openAccess Brachiopoda Dailyatia Cambrian Drumian Middle Cambrian Early Cambrian Antarctica tommotiid camenellan palaeobiology small shelly fossils Licentiate thesis, comprehensive summary info:eu-repo/semantics/masterThesis text 2015 ftuppsalauniv 2023-02-23T21:38:59Z The origin of many lophotrochozoan groups can be traced to “small shelly fossil” (SSF) faunas of the Early Cambrian. Antarctica is a key region of study, due to the continent’s known close geographical proximity to well-studied Australian and Indian basins in in the Cambrian. Few studies have focused on this region however, due to a paucity of data. Re-examination of camenellan sclerites from the Early Cambrian Shackleton Limestone of the Churchill Mountains of Antarctica has revealed a previously unidentified species of Dailyatia in the formation, co-occurring alongside previously described Dailyatia odyssei Evans and Rowell, 1990, as in the Arrowie Basin of Australia. Re-examination of material previously described as Kennardia sp. A and Kennardia sp. B has indicated that these taxa can likely be synonymized as a second species of Dailyatia. Dailyatia sclerites were also found in the temporally equivalent “Schneider Hills Limestone” formation, which cropsout in the Argentina Range of Antarctica. These specimens appear to belongto a third species of Dailyatia, suggesting that the spatial distribution of tommotiids in the Early Cambrian was more complex than previously recognized, and that the group may be useful in future biostratigraphic studies. A study ofthe Middle Cambrian (Drumian Stage) Nelson Limestone Formation of the Neptune Range, Antarctica has revealed a moderately diverse brachiopod and trilobite fauna. The brachiopods have strong faunal links to taxa from South Australia and India, as well as other parts of the Antarctic province, fitting independent strong evidence for a united East Gondwanan region in the Middle Cambrian. An unidentified camenellan tommotiid sclerite is also described from the Nelson Limestone. This extends the worldwide temporal range of the tommotiid clade into the Drumian Stage, and suggests that more basal members of the brachiopod stem-group survived to form part of a more diverse Middle Cambrian fauna. Master Thesis Antarc* Antarctic Antarctica Uppsala University: Publications (DiVA) Antarctic Argentina Argentina Range ENVELOPE(-42.172,-42.172,-82.362,-82.362) Churchill Mountains ENVELOPE(158.500,158.500,-81.500,-81.500) Indian Neptune Range ENVELOPE(-53.000,-53.000,-84.000,-84.000) Schneider Hills ENVELOPE(-42.701,-42.701,-82.571,-82.571) Shackleton The Antarctic Transantarctic Mountains |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Brachiopoda Dailyatia Cambrian Drumian Middle Cambrian Early Cambrian Antarctica tommotiid camenellan palaeobiology small shelly fossils |
spellingShingle |
Brachiopoda Dailyatia Cambrian Drumian Middle Cambrian Early Cambrian Antarctica tommotiid camenellan palaeobiology small shelly fossils Bassett-Butt, Lewis The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
topic_facet |
Brachiopoda Dailyatia Cambrian Drumian Middle Cambrian Early Cambrian Antarctica tommotiid camenellan palaeobiology small shelly fossils |
description |
The origin of many lophotrochozoan groups can be traced to “small shelly fossil” (SSF) faunas of the Early Cambrian. Antarctica is a key region of study, due to the continent’s known close geographical proximity to well-studied Australian and Indian basins in in the Cambrian. Few studies have focused on this region however, due to a paucity of data. Re-examination of camenellan sclerites from the Early Cambrian Shackleton Limestone of the Churchill Mountains of Antarctica has revealed a previously unidentified species of Dailyatia in the formation, co-occurring alongside previously described Dailyatia odyssei Evans and Rowell, 1990, as in the Arrowie Basin of Australia. Re-examination of material previously described as Kennardia sp. A and Kennardia sp. B has indicated that these taxa can likely be synonymized as a second species of Dailyatia. Dailyatia sclerites were also found in the temporally equivalent “Schneider Hills Limestone” formation, which cropsout in the Argentina Range of Antarctica. These specimens appear to belongto a third species of Dailyatia, suggesting that the spatial distribution of tommotiids in the Early Cambrian was more complex than previously recognized, and that the group may be useful in future biostratigraphic studies. A study ofthe Middle Cambrian (Drumian Stage) Nelson Limestone Formation of the Neptune Range, Antarctica has revealed a moderately diverse brachiopod and trilobite fauna. The brachiopods have strong faunal links to taxa from South Australia and India, as well as other parts of the Antarctic province, fitting independent strong evidence for a united East Gondwanan region in the Middle Cambrian. An unidentified camenellan tommotiid sclerite is also described from the Nelson Limestone. This extends the worldwide temporal range of the tommotiid clade into the Drumian Stage, and suggests that more basal members of the brachiopod stem-group survived to form part of a more diverse Middle Cambrian fauna. |
format |
Master Thesis |
author |
Bassett-Butt, Lewis |
author_facet |
Bassett-Butt, Lewis |
author_sort |
Bassett-Butt, Lewis |
title |
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
title_short |
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
title_full |
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
title_fullStr |
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
title_full_unstemmed |
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica |
title_sort |
cambrian lophotrochozoans of the transantarctic mountains, antarctica |
publisher |
Uppsala universitet, Paleobiologi |
publishDate |
2015 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252137 |
long_lat |
ENVELOPE(-42.172,-42.172,-82.362,-82.362) ENVELOPE(158.500,158.500,-81.500,-81.500) ENVELOPE(-53.000,-53.000,-84.000,-84.000) ENVELOPE(-42.701,-42.701,-82.571,-82.571) |
geographic |
Antarctic Argentina Argentina Range Churchill Mountains Indian Neptune Range Schneider Hills Shackleton The Antarctic Transantarctic Mountains |
geographic_facet |
Antarctic Argentina Argentina Range Churchill Mountains Indian Neptune Range Schneider Hills Shackleton The Antarctic Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252137 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766096927281119232 |