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Conodonts from the Permian–Triassic transition in Australia and position of the Permian–Triassic boundary

2008; Taylor & Francis; Volume: 55; Issue: 3 Linguagem: Inglês

10.1080/08120090701769480

1440-0952

Ian Metcalfe, Robert S. Nicoll, R. J. Willink,

Geological and Geophysical Studies

Abstract Late Permian (late Changhsingian), possible Early Triassic Induan (Dienerian), and early Olenekian (Smithian) conodonts have been recovered from the Hovea Member of the Kockatea Shale in the exploration well Corybas 1, northern Perth Basin, Western Australia. Placement of the biostratigraphic Permian – Triassic boundary is in the lower part of the Sapropelic Interval of the Hovea Member. The Australian endemic Protohaploxypinus microcorpus palynofloral Zone is confirmed to be of late (but not latest) Changhsingian age. The Permian – Triassic boundary, based on international calibration using conodonts, carbon-isotope stratigraphy and new radio-isotopic dating, is placed in the lower part of the Kraeuselisporites saeptatus and Lunatisporites pellucidus Zones of western and eastern Australia, respectively, which corresponds approximately to the basal part of the Rewan Group and equivalents in eastern Australia. KEY WORDS: Australiaconodontsinternational calibrationmegasporesPermian–Triassic boundary Acknowledgements IM acknowledges support from the Australian Research Council for P – T boundary and mass extinction studies. We thank Mike Orchard, Heinz Kozur, Bruce Wardlaw and Charles Henderson for discussions on conodont taxonomy. Ian Glasspool and Clinton Foster are thanked for discussions on palynology and assistance with megaspore identifications. We thank Bruce Thomas for helpful comments on an early draft of the paper. Origin Energy and Arc Energy kindly provided the Corybas 1 drill cuttings samples, and support for sample preparation and digestion. Charles Henderson and an anonymous referee are thanked for their helpful reviews of the paper.