Sydney Basin, Australia Permian-Triassic Boundary Geochemical Data Fielding, C.R.; Frank, T.D.; McLoughlin, S.; Vajda, V.; Mays, C.; Tevyaw, A.P.; Winguth, A.; Winguth, C.; Nicoll, R.S.; Bocking, M.; Crowley, J.L. Fielding, C.R. Frank, T.D. McLoughlin, S. Vajda, V. Mays, C. Tevyaw, A.P. Winguth, A. Winguth, C. Nicoll, R.S. Bocking, M. Crowley, J.L. earth science/paleoclimate/others (Pacific Power Hawkesbury Bunnerong DDH-1>LATITUDE -33.976>LONGITUDE 151.218) Past studies of the end-Permian extinction (EPE), the largest biotic crisis of the Phanerozoic, have not resolved the timing of events in southern high-latitudes. Here we use palynology coupled with high-precision CA-ID-TIMS dating of euhedral zircons from continental sequences of the Sydney Basin, Australia, to show that the collapse of the austral Permian Glossopteris flora occurred prior to 252.3 Ma (~370 kyrs before the main marine extinction). Weathering proxies indicate that floristic changes occurred during a brief climate perturbation in a regional alluvial landscape that otherwise experienced insubstantial change in fluvial style, insignificant reorganization of the depositional surface, and no abrupt aridification. Palaeoclimate modelling suggests a moderate shift to warmer summer temperatures and amplified seasonality in temperature across the EPE, and warmer and wetter conditions for all seasons into the Early Triassic. The terrestrial EPE and a succeeding peak in Ni concentration in the Sydney Basin correlate, respectively, to the onset of the primary extrusive and intrusive phases of the Siberian Traps Large Igneous Province. STUDY NOTES: Carbon isotope (d13C) and geochemical (Nickel concentration, Kaolinite/Illite ratio, Chemical Index of Alteration) data from a drillhole in the Sydney Basin, New South Wales, Australia, for the Permian-Triassic boundary interval (259-248 million years BP) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Fielding, C.R. Investigator : Frank, T.D. Investigator : McLoughlin, S. Investigator : Vajda, V. Investigator : Mays, C. Investigator : Tevyaw, A.P. Investigator : Winguth, A. Investigator : Winguth, C. Investigator : Nicoll, R.S. Investigator : Bocking, M. Investigator : Crowley, J.L. 2019-06-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26990 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/fielding2019/sydneybasin2019.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/fielding2019/sydneybasin2019.txt English https://www.ncdc.noaa.gov/paleo/study/26990 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/fielding2019/sydneybasin2019.txt Christopher R. Fielding, Tracy D. Frank, Stephen McLoughlin, Vivi Vajda, Chris Mays, Allen P. Tevyaw, Arne Winguth, Cornelia Winguth, Robert S. Nicoll, Malcolm Bocking, James L. Crowley2019Age and pattern of the southern high-latitude continental end-Permian extinction constrained by multiproxy analysisNature Communications3851010.1038/s41467-018-07934-zhttps://www.nature.com/articles/s41467-018-07934-z START YEAR: 259000000 cal yr BP * END YEAR: 248000000 cal yr BP 151.218 -33.976 151.218 -33.976