%0 Generic %A Hunter, Morag A. %A J. Cantrill, David %A Flowerdew, Michael J. %A Millar, Ian L. %D 2016 %T Mid-Jurassic age for the Botany Bay Group: implications for Weddell Sea Basin creation and southern hemisphere biostratigraphy %U https://geolsoc.figshare.com/articles/dataset/Mid-Jurassic_age_for_the_Botany_Bay_Group_implications_for_Weddell_Sea_Basin_creation_and_southern_hemisphere_biostratigraphy/3454298 %R 10.6084/m9.figshare.3454298.v1 %2 https://geolsoc.figshare.com/ndownloader/files/5425571 %K Weddell Sea embayment %K Weddell Sea Basin creation %K Southern Hemisphere biostratigraphic correlations %K Ma %K sedimentation %K Antarctic Peninsula %K Botany Bay Group floras %K Botany Bay Group %K volcanism %K implication %K Geology %X

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.

%I Geological Society of London