Digitala Vetenskapliga Arkivet

Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
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 universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. 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.
Visa övriga samt affilieringar
2019 (Engelska)Ingår i: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 64, nr 3, s. 489-522Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2019. Vol. 64, nr 3, s. 489-522
Nyckelord [en]
Brachiopoda, Trilobita, Tommotiida, chronostratigraphy, early Cambrian, Australia
Nationell ämneskategori
Geologi
Identifikatorer
URN: urn:nbn:se:uu:diva-394982DOI: 10.4202/app.00586.2018ISI: 000486595900004OAI: oai:DiVA.org:uu-394982DiVA, id: diva2:1360233
Tillgänglig från: 2019-10-11 Skapad: 2019-10-11 Senast uppdaterad: 2020-02-26Bibliografiskt granskad
Ingår i avhandling
1. Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia
Öppna denna publikation i ny flik eller fönster >>Biostratigraphy and Systematics of Cambrian Small Shelly Fossils from East Antarctica and South Australia
2021 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The remote lower Cambrian Byrd group of sedimentary rocks from East Antarctica has been studied intermittently since its discovery over a century ago. Previous insights into the trilobites and archaeocyaths indicated a close correlation to the sedimentary sequences of South Australia. The lowest unit of the Byrd Group is the fossiliferous Shackleton Limestone which overlies the Neoproterozoic metamorphic rocks of the Beardmore Group and is representative of a long period of carbonate shelf formation on a passive margin with the palaeo-Pacific. This was truncated by marine transgression and the deposition of the deeper-water calcareous siltstones of the fossiliferous Holyoake Formation. This is overlain by the Starshot Formation and all three units are cross-cut by the Douglas Conglomerate, marking the start of a collisional tectonic regime between the East Gondwana and palaeo-Pacific plates. The first systematically sampled and analysed sections through the carbonate Shackleton Limestone and argillaceous Holyoake Formation has yielded a new fauna of small primarily phosphatic and secondarily phosphatised shelly fossils. The abundant molluscs, brachiopods and tommotiids are reported here. These findings are ideal for correlating this section to the fossil biozones of South Australia, including the Dailyatia odyssei small shelly fossil Zone and the Pararaia janeae trilobite Zone. Chemostratigraphic data from three sections preserve the profiles of two major stable carbon isotope excursions: the Mingxinsi Carbon Isotope Excursion and the Archaeocyathid Extinction Carbon isotope Excursion. The combination of these two lines of evidence are a strong indicator for Cambrian Series 2, early-mid Stage 4. This is corroborated by newly described D. odyssei-P. janeae Zone small shelly fossils from the  carbonate clasts from the Cambrian Stage 4 White Point Conglomerate of South Australia which bear strong similarity to the fauna of the Shackleton Limestone. Palaeobiogeographically the fauna recovered from the Byrd Group is similar to the East Gondwanan region of South Australia, with similar brachiopod assemblages to those recovered from the Xinji Formation of North China and similar molluscan assemblages to the Bastion Formation of North-East Greenland.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2021. s. 63
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1907
Nyckelord
Cambrian, Biostratigraphy, Systematics, East Antarctica, Small Shelly Fossils
Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Identifikatorer
urn:nbn:se:uu:diva-405216 (URN)978-91-513-0880-7 (ISBN)
Disputation
2021-02-26, Hambergsalen, Geocentrum, Villavägen 16,, 752 36 Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2021-01-29 Skapad: 2020-02-26 Senast uppdaterad: 2021-03-04

Open Access i DiVA

fulltext(1402 kB)220 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1402 kBChecksumma SHA-512
b21a5d11c1a62d60047712a8aea139eef9ab1938a9be62ad2214cac03909fdc9191bb579f1d679e1067fa22c8daee8a53a3f91afc905bf81053a5c6cd6696b7a
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextURL

Sök vidare i DiVA

Av författaren/redaktören
Claybourn, ThomasBrock, Glenn A.
Av organisationen
Paleobiologi
I samma tidskrift
Acta Palaeontologica Polonica
Geologi

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 220 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 167 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf