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Description of camenellan tommotiids from the Early Cambrian of the Transantarctic Mountains, Antarctica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Palaeobiology)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A collection of camenellan tommotiid sclerites from the Transantarctic Mountains have been re-examined. New data shows that Dailyatia sp. A is found alongside Dailyatia odyssei Evans and Rowell 1990 in the Early Cambrian Shackleton Limestone, as in the Arrowie Basin of Australia. A further examination of Shackleton Limestone sclerites, similar to others previously described as Kennardia sp. A and Kennardia sp. B, suggests that the Shackleton Limestone also contains a further species of camenellan. A further examination of the detail of ornamentation and gross morphology ofthese sclerites suggests that they are more likely to be a further species of Dailyatia, rather than Kennardia. A new species of Dailyatia is also reported from the Early Cambrian "Schneider Hills Limestone" formation of the Argentina Range. No overlap is found in sclerite morphologies between the Botomian-aged Schneider Hills and the temporally equivalent Shackleton Limestone, indicating a spatial influence on the distribution of tommotiids in the Cambrian of Antarctica.

Keyword [en]
Cambrian; Tommotiids; Dailyatia; Small Shelly Fossils; Early Cambrian; Paleobiogeography; Antarctica
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-252130OAI: oai:DiVA.org:uu-252130DiVA: diva2:809327
Projects
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
Funder
Swedish Research Council, VR 2009-4395, 2012-1658.
Note

In press.

Available from: 2015-05-02 Created: 2015-05-02 Last updated: 2015-05-20
In thesis
1. The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
Open this publication in new window or tab >>The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

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.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2015
Keyword
Brachiopoda, Dailyatia, Cambrian, Drumian, Middle Cambrian, Early Cambrian, Antarctica, tommotiid, camenellan, palaeobiology, small shelly fossils
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-252137 (URN)
Presentation
2015-05-08, Geocentrum Skåne, Geocentrum, Villavägen 16, 752 36 Uppsala, Uppsala, 18:05 (English)
Opponent
Supervisors
Funder
Swedish Research Council, VR 2009-4395, 2012-1658.
Available from: 2015-05-20 Created: 2015-05-02 Last updated: 2015-10-21Bibliographically approved

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