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Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China

R.J.F. Jenkins, J.A. Cooper and W. Compston
Journal of the Geological Society, 159, 645-658, 1 December 2002, https://doi.org/10.1144/0016-764901-127
R.J.F. Jenkins
11Department of Geology and Geophysics, Adelaide University, North Terrace, Adelaide, S.A. 5005, Australia (e-mail: richard.jenkins@adelaide.edu.au)
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J.A. Cooper
11Department of Geology and Geophysics, Adelaide University, North Terrace, Adelaide, S.A. 5005, Australia (e-mail: richard.jenkins@adelaide.edu.au)
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W. Compston
22Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia
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Abstract

Reassessment of faunal discoveries in the Fleurieu Peninsula, South Australia, shows that the Sellick Hill tuff is late Atdabanian or early Botomian in age and is preceded by Tommotian to Atdabanian equivalents. Previous and new sensitive high-resolution ion microprobe (SHRIMP) zircon ages from the tuff have been adjusted for Pb loss in the reference zircon, and mixture-modelling has been applied to resolve inheritance and Pb loss. The revised tuff age is now 522.0 ± 2.0 Ma (σ), 0.7% younger than the original estimate. Undocumented SHRIMP ages for zircons from a middle to upper Botomian tuff near Cymbric Vale were cited in 1994 as a single 525 ± 4 Ma population, but reprocessing using the present approach shows instead that the correct age of volcanism is 517.8 ± 2.1 Ma (σ). Reprocessed and new SHRIMP ages for zircons from tuff within Bed 5 of the Lower Cambrian Meishucun section, South China, give a revised age for the earlier Tommotian of 538.2 ± 1.5 Ma (σ). We agree with US workers that the stratotypic lowest Cambrian sequence of Newfoundland correlates within the Nemakit–Daldynian of Siberia. These results agree broadly with the Early Cambrian time scale based on zircon U–Pb isotope dilution data, but differences remain that arise more from interpretations of biostratigraphy and from the preservation and origin of the sampled zircon grains than from instrumental accuracy. In particular, the increased duration for the Tommotian indicated by our results supports notions of a more gradualistic evolution attending the origins of animal skeletons.

  • China
  • Australia
  • Cambrian
  • biostratigraphy
  • absolute age
  • © 2002 The Geological Society of London
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Journal of the Geological Society: 159 (6)
Journal of the Geological Society
Volume 159, Issue 6
December 2002
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Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China

R.J.F. Jenkins, J.A. Cooper and W. Compston
Journal of the Geological Society, 159, 645-658, 1 December 2002, https://doi.org/10.1144/0016-764901-127
R.J.F. Jenkins
11Department of Geology and Geophysics, Adelaide University, North Terrace, Adelaide, S.A. 5005, Australia (e-mail: richard.jenkins@adelaide.edu.au)
  • Find this author on Google Scholar
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J.A. Cooper
11Department of Geology and Geophysics, Adelaide University, North Terrace, Adelaide, S.A. 5005, Australia (e-mail: richard.jenkins@adelaide.edu.au)
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
W. Compston
22Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 0200, Australia
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Age and biostratigraphy of Early Cambrian tuffs from SE Australia and southern China

R.J.F. Jenkins, J.A. Cooper and W. Compston
Journal of the Geological Society, 159, 645-658, 1 December 2002, https://doi.org/10.1144/0016-764901-127
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  • Article
    • Abstract
    • Biostratigraphy of the Normanville Group, Fleurieu Peninsula
    • The Cymbric Vale fauna of western New South Wales
    • Analytical methods and interpretation of ages
    • Sellick Hill tuff
    • Cymbric Vale tuff
    • Meishucun Bed 5 tuff
    • Discussion and conclusions
    • Acknowledgements
    • References
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