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The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
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 [en]
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: urn:nbn:se:uu:diva-252137OAI: oai:DiVA.org:uu-252137DiVA: diva2:809352
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
List of papers
1. Systematics, biostratigraphy and biogeography of brachiopods and other fossils from the Middle Cambrian Nelson Limestone, Antarctica
Open this publication in new window or tab >>Systematics, biostratigraphy and biogeography of brachiopods and other fossils from the Middle Cambrian Nelson Limestone, Antarctica
2016 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, no 3, 377-392 p.Article in journal (Refereed) Published
Abstract [en]

An assemblage dominated by acrotretid brachiopods (Prototreta millsi Brock and Percival, 2006) is described from the Nelson Limestone of the Transantarctic Mountains, Antarctica. The formation also includes paterinids (Micromitra sp. cf. M. nerranubawu Kruse, 1990 and Dictyonina australis Roberts, 1990), lingulids (Oepikites haimantensis Reed, 1910)and acrothelids (Acrothele sp. cf. A. vertex Reed, 1910). The macrofauna also contains orthids (Diraphora dyunyin Kruse, 1990). The associated fauna include sponge spicules present in vast abundance. Other recognisable small shelly fossils (including chancelloriids and hyolithelminths) make up a small section of the fauna. Trilobites (including Nelsonia schesis Palmer and Gatehouse, 1972 and Solenopleura pruina Palmer and Gatehouse, 1972) belong to taxa previously described from the Nelson Limestone and support the Drumianage proposed for the formation. Palaeobiogeographic analysis indicates that the brachiopod fauna corroborates previously described strong links with Australasia and also suggests a strong link to Indian material, corroborating previous evidence for an East Gondwanan faunal province in the Middle Cambrian.

Keyword
Cambrian; Brachiopods; Trilobites; Small Shelly Fossils; Biostratigraphy; Palaeobiogeography
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
urn:nbn:se:uu:diva-252128 (URN)10.1080/11035897.2015.1094510 (DOI)000381491500002 ()
External cooperation:
Projects
The Cambrian lophotrochozoans of the Transantarctic Mountains, Antarctica
Funder
Swedish Research Council, VR 2009-4395, 2012-1658.
Note

Currently in press.

Available from: 2015-05-02 Created: 2015-05-02 Last updated: 2017-12-04Bibliographically approved
2. Description of camenellan tommotiids from the Early Cambrian of the Transantarctic Mountains, Antarctica
Open this publication in new window or tab >>Description of camenellan tommotiids from the Early Cambrian of the Transantarctic Mountains, Antarctica
(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
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:nbn:se:uu:diva-252130 (URN)
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
3. Discovery of the youngest known tommotiid from the middle Cambrian (Drumian) Nelson Limestone of Antarctica
Open this publication in new window or tab >>Discovery of the youngest known tommotiid from the middle Cambrian (Drumian) Nelson Limestone of Antarctica
(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
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:nbn:se:uu:diva-252129 (URN)
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

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Output format
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