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Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy

Morag A. Hunter, David J. Cantrill, Michael J. Flowerdew and Ian L. Millar
Journal of the Geological Society, 162, 745-748, 1 September 2005, https://doi.org/10.1144/0016-764905-051
Morag A. Hunter
11British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: mahu@bas.ac.uk)
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David J. Cantrill
22Swedish Museum of Natural History, Department of Palaeobotany, Box 50007, Stockholm 104 05 Sweden
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Michael J. Flowerdew
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Ian L. Millar
33NERC isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK
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Abstract

New U–Pb zircon ion-microprobe ages from the alluvial conglomerates and flood plain sediments of the Botany Bay Group demonstrate that sedimentation occurred at c. 167 Ma, coeval with rift-related silicic volcanism in the northern Antarctic Peninsula. In contrast, rift-related volcanism and sedimentation in the southern Antarctic Peninsula (Latady Basin) occurred at c. 183 Ma. The new data indicate that syn-rift sedimentation and volcanism was diachronous from south to north, consistent with early opening of the Weddell Sea embayment by anti-clockwise rotation of the Antarctic Peninsula in the Mid-Jurassic. A definitive date for the Botany Bay Group floras has important implications for Southern Hemisphere biostratigraphic correlations.

  • Antarctica
  • Middle Jurassic
  • Gondwana
  • biostratigraphy
  • absolute age
  • © 2005 The Geological Society of London
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Journal of the Geological Society: 162 (5)
Journal of the Geological Society
Volume 162, Issue 5
September 2005
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Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy

Morag A. Hunter, David J. Cantrill, Michael J. Flowerdew and Ian L. Millar
Journal of the Geological Society, 162, 745-748, 1 September 2005, https://doi.org/10.1144/0016-764905-051
Morag A. Hunter
11British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: mahu@bas.ac.uk)
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David J. Cantrill
22Swedish Museum of Natural History, Department of Palaeobotany, Box 50007, Stockholm 104 05 Sweden
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Michael J. Flowerdew
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Ian L. Millar
33NERC isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK
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Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy

Morag A. Hunter, David J. Cantrill, Michael J. Flowerdew and Ian L. Millar
Journal of the Geological Society, 162, 745-748, 1 September 2005, https://doi.org/10.1144/0016-764905-051
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    • Abstract
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