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Summary of East Gondwanan Conodont Data through the Ireviken Event at Boree Creek

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Abstract

The Ireviken Event was the first Middle Paleozoic event consisting of synchronised faunal, isotopic and facies change to be recognised. An analysis of the conodont faunas throughout the Boree Creek/Borenore Limestone succession in the central western region of the Tasman fold belt of New South Wales (Australia) revealing all five conodont zones that comprise the event is presented. While some zonal boundaries are precise, allowing direct comparison of stratigraphic intervals on other paleo-continents, some can only be approximated. Conodont data from pre-Ireviken Event strata, in contrast, only permit the identification of a broad Telychian chronology. The identification of Wenlock post-Ireviken Event conodont zones is incomplete due to lithological variability, namely the presence of tuffaceous beds near the top of the formation and an unconformity between the Boree Creek and overlying Borenore Limestone. The Boree Creek Formation contains the only example of the Ireviken Event discovered to date from the Tasman fold belt of eastern Gondwanaland.

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Acknowledgments

We are grateful for the excellent figures produced for this article with flair by Dean Oliver. We thank Leone Knight, the owner of the Kalinga property near Orange for allowing access to the site to collect geochemical and conodont samples during field work in 2018. We thank Joanne Simpson for organising logistics for this collecting. New sampling in 2018 was supported by the Grant Agency of Czech Republic (No. GA17-18120S). This work builds on long term paleontological interest in the area by MUCEP (Macquarie University Centre for Ecostratigraphy and Palaeobiology), a former research centre at Macquarie University that undertook extensive Middle Paleozoic research activity under the leadership of Emeritus Professor John Talent and the late Ruth Mawson. In particular, this article builds on the work of our good friend and close colleague, the late Peter Molloy, who undertook his PhD studies on conodont faunas recovered from Kalinga Gully. We dedicate this paper to his memory. Specimens illustrated form part of a larger study on the conodonts of the Boree Creek Formation, they will be lodged in the collections of the Australian Museum, Sydney and are identified by their AMF numbers. The final publication is available at Springer via https://doi.org/10.1007/s12583-021-1310-9.

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  1. Archives and Collections, University Library, Macquarie University, Sydney, NSW, 2109, Australia

    Andrew Simpson

  2. Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia

    David Mathieson

  3. Department of Environmental Geosciences, Czech University of Life Sciences Prague, 16500, Prague, Czech Republic

    Jiri Frýda & Barbora Frýdová

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Simpson, A., Mathieson, D., Frýda, J. et al. Summary of East Gondwanan Conodont Data through the Ireviken Event at Boree Creek. J. Earth Sci. 32, 512–523 (2021). https://doi.org/10.1007/s12583-021-1310-9

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