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Systematics, biostratigraphy and biogeography of brachiopods and other fossils from the Middle Cambrian Nelson Limestone, Antarctica
(Palaeobiology)
2016 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, no 3, p. 377-392Article 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.

Place, publisher, year, edition, pages
2016. Vol. 138, no 3, p. 377-392
Keywords [en]
Cambrian; Brachiopods; Trilobites; Small Shelly Fossils; Biostratigraphy; Palaeobiogeography
National Category
Geology
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-252128DOI: 10.1080/11035897.2015.1094510ISI: 000381491500002OAI: oai:DiVA.org:uu-252128DiVA, id: diva2:809325
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
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
Keywords
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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