Calibration of Early Cretaceous dinoflagellate zones from the NWS of Australia to the global time scale through calcareous nannofossils |
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| Institution: | 1. BHP Billiton Petroleum, 1360 Post Oak Boulevard, Houston, TX 77056, USA;2. UWA Centre for Energy Geoscience, School of Earth and Environment, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. Department of Physiology and Biophysics, University of California, Irvine, CA 92697, USA;2. Institut für Toxikologie, Medizinische Hochschule Hannover, Hannover, Germany;3. NE-CAT and Department of Chemistry and Chemical Biology, Cornell University, Building 436E, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USA;4. Foodborne Toxin Detection and Prevention Research Unit, Western Regional Research Center, United States Department of Agriculture, Agricultural Research Service, Albany, CA 94710, USA;1. Department of Physics, Middle East Technical University, 06531 Ankara, Turkey;2. Department of Mathematics and Computer Science, Istanbul Arel University, Büyükçekmece, 34537 Istanbul, Turkey;1. Instituto Geológico del Sur-Consejo Nacional de Investigaciones Científicas y Técnicas/Departamento de Geología (UNS), Av. Alem 1253, Cuerpo B′-1º Piso, B8000ICN Bahía Blanca, Buenos Aires, Argentina;3. GCS ARGENTINA, Molina Campos 150, Bahía Blanca 8000, Argentina;4. Pampa Energía S.A., Maipu 1, Ciudad Autónoma de Buenos Aires, Argentina |
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| Abstract: | Palynomorphs and nannofossils were examined from the Lower Cretaceous interval of the well North Scarborough-1, drilled on the Exmouth Plateau, North West Shelf of Australia. Integration of the chronostratigraphic information from both fossil groups revealed discrepancies in the age information with the nannofossils suggesting a younger age than dinoflagellate cysts. The nannofossil events have a stronger tie to the global time scale than the dinoflagellate zones which are mainly local. The direct comparison of nannofossil and dinoflagellate events in the same section allows for improved stratigraphic precision and a revised correlation of Australian dinoflagellate zonal ages to the global time scale, GTS12. Global nannofossil ages confirm a Barremian–late Hauterivian age for the Muderongia australis Zone, but the Systematophora areolata to Dissimulidinium lobispinosum Zones appear to be 1–2 my younger than previously estimated. |
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| Keywords: | Biostratigraphy Nannofossils Palynology Early Cretaceous Australia |
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