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Discovery of the youngest known tommotiid from the middle Cambrian (Drumian) Nelson Limestone of Antarctica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Palaeobiology)
Swedish Museum of Natural History. (Palaeobiology)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A potential fragmentary tommotiid sclerite is described from the Nelson Limestone Formation of the Pensacola Mountains, Antarctica (Drumian in age). The sclerite bears similarities to other early Cambrian camenellan tommotiids. The sclerite is bilaterally symmetrical and may belong toa new genus. The find suggests that tommotiids may range into the Drumian Stage.

Keyword [en]
Cambrian; Tommotiids; Small Shelly Fossils; Middle Cambrian; Palaeobiogeography; Antarctica
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-252129OAI: oai:DiVA.org:uu-252129DiVA: diva2:809326
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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