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Journal of the Geological Society; 2005; v. 162; issue.5; p. 745-748;
DOI: 10.1144/0016-764905-051
© 2005 Geological Society of London

Short Communication

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

Morag A. Hunter1, David J. Cantrill2, Michael J. Flowerdew & Ian L. Millar3

1 1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: mahu@bas.ac.uk)
2 2Swedish Museum of Natural History, Department of Palaeobotany, Box 50007, Stockholm 104 05 Sweden
3 3NERC isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK

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.


Keywords: Antarctica, Middle Jurassic, Gondwana, biostratigraphy, absolute age.




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