Shelly fossils from the lower Cambrian White Point Conglomerate, Kangaroo Island, South Australia

• Autorzy: Betts M.J. , Claybourn T.M. , Brock G.A. , Jago J.B. , Skovsted C.B. , Paterson J.R.
• Języki publikacji: EN

Abstrakty

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.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2019
• Tom: 64
• Numer: 3
• Opis fizyczny: p.489-522,fig.,ref.

Twórcy

autor

Betts M.J.

• Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia, 2351
• Early Life Institute and Department of Geology, State Key Laboratory for Continental Dynamics, Northwest University, Xi’an 710069, China

autor

Claybourn T.M.

• Department of Biological Sciences, Macquarie University, North Ryde, Sydney, NSW, Australia, 2109
• Department of Earth Sciences, Palaeobiology, Uppsala University, Villav. 16, SE-75236, Uppsala, Sweden

autor

Brock G.A.

• Department of Biological Sciences, Macquarie University, North Ryde, Sydney, NSW, Australia, 2109

autor

Jago J.B.

• School of Natural and Built Environments, University of South Australia, Mawson Lakes, Adelaide, SA, Australia, 5005

autor

Skovsted C.B.

• Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, SE 104 05 Stockholm, Sweden

autor

Paterson J.R.

• Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia, 2351

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Identyfikatory

DOI

10.4202/app.00586.2018