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Shelly fossils from the lower Cambrian White Point Conglomerate, Kangaroo Island, South Australia
Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW, Australia; Northwest Univ, Early Life Inst, Xian, Shaanxi, Peoples R China; Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Shaanxi, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology. Macquarie Univ, Dept Biol Sci, Sydney, NSW, Australia.ORCID iD: 0000-0002-1216-1886
Macquarie Univ, Dept Biol Sci, Sydney, NSW, Australia.ORCID iD: 0000-0002-2277-7350
Univ South Australia, Sch Nat & Built Environm, Adelaide, SA, Australia.
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2019 (English)In: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 64, no 3, p. 489-522Article in journal (Refereed) Published
Abstract [en]

The lower Cambrian (Series 2) White Point Conglomerate (WPC) on Kangaroo Island, South Australia contains exotic clasts representing a diverse array of lithologies, including metamorphics, chert, sandstone, and abundant carbonates, notably archaeocyath-rich bioclastic limestone. Acetic acid digestion of the WPC bioclastic limestone clasts reveals a diverse shelly fauna. This assemblage includes abundant organophosphatic brachiopods such as Cordatia erinae Brock and Claybourn gen. et sp. nov., Curdus pararaensis, Eodicellomus elkaniformiis, Eohadrotreta sp. cf. E. zhenbaensis, Eoobolus sp., Kyrshabaktella davidii, and Schizopholis yorkensis. Additional shelly taxa include the solenopleurid trilobite Trachoparia? sp., the tommotiids Dailyatia odyssei, Dailyatia decobruta Betts sp. nov., Kelanella sp., and Lapworthella fasciculata, spines of the bradoriid arthropod Mongolitubulus squamifer, and several problematica, such as Stoibostrombus crenulatus and a variety of tubular forms. The upper age limit for the WPC is constrained by biostratigraphic data from the overlying Marsden Sandstone and Emu Bay Shale, which are no younger than the Pararaia janeae Trilobite Zone (Cambrian Series 2, Stage 4). The shelly fossil assemblage from the WPC limestone clasts indicates an upper Dailyatia odyssei Zone (= Pararaia tatei to lower P. janeae trilobite zones), equivalent to the Atdabanian–early Botoman of the Siberian scheme. This contrasts with the previously suggested late Botoman age for the limestone clasts, based on the diverse archaeocyath assemblage. The minor age difference between the WPC and its fossiliferous limestone clasts suggests relatively rapid reworking of biohermal buildups during tectonically-active phases of deposition in the Stansbury Basin.

Place, publisher, year, edition, pages
2019. Vol. 64, no 3, p. 489-522
Keywords [en]
Brachiopoda, Trilobita, Tommotiida, chronostratigraphy, early Cambrian, Australia
National Category
Geology
Identifiers
URN: urn:nbn:se:uu:diva-394982DOI: 10.4202/app.00586.2018ISI: 000486595900004OAI: oai:DiVA.org:uu-394982DiVA, id: diva2:1360233
Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-11Bibliographically approved

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