Earth and Life

Part of the series International Year of Planet Earth pp 615-630

An Analysis of the Ireviken Event in the Boree Creek Formation, New South Wales, Australia

  • Peter D. Molloy†Affiliated withEarth and Planetary Sciences, Macquarie University
  • , Andrew J. SimpsonAffiliated withDepartment of Earth and Planetary Sciences, Museum Studies and Centre for Ecostratigraphy and Palaeobiology (MUCEP), Macquarie University Email author 

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Conodont data from a section through the Boree Creek Formation in New South Wales, the best sequence in Australia extending through the Llandovery–Wenlock boundary, represent strata of the Ireviken Event. A significant number of conodont datum planes within the sequence indicating step-wise extinctions can be recognised and correlated with the sequence through the Visby Beds, in Gotland, Sweden, the most comprehensively analysed Ireviken Event sequence globally. This intercontinental correlation, involving both north and south hemispheres, adds to the data set concerning cyclicity in Silurian marine strata and postulated models concerning causality.


Silurian Llandovery Wenlock Australia Boree Creek Formation Conodonts Ireviken Event Stepped extinctions Stratigraphic alignments Cyclicity