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Timing of recovery from the end-Permian extinction: Geochronologic and biostratigraphic constraints from south China

Daniel J. Lehrmann^*,1, Jahandar Ramezani², Samuel A. Bowring², Mark W. Martin^,2, Paul Montgomery^#,3, Paul Enos³, Jonathan L. Payne⁴, Michael J. Orchard⁵, Wang Hongmei⁶ and Wei Jiayong⁶

¹ Department of Geology, University of Wisconsin–Oshkosh, Oshkosh, Wisconsin 54901, USA
² Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
³ Department of Geology, University of Kansas, Lawrence, Kansas 66045, USA
⁴ Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA
⁵ Geological Survey of Canada, Vancouver, BC V6B 5J3, Canada
⁶ Guizhou Bureau of Geology and Mineral Resources, Guiyang, Guizhou, People's Republic of China

Four volcanic-ash beds bracket the Early-Middle Triassic boundary, as defined by conodont biostratigraphy, in a stratigraphic section in south China. High-precision U-Pb dates of single zircons allow us to place the Early to Middle Triassic (Olenekian-Anisian) boundary at 247.2 Ma. Magnetic-reversal stratigraphy allows global correlation. The new dates constrain the Early Triassic interval characterized by delayed biotic recovery and carbon-cycle instability to 5 m.y. This time constraint must be considered in any model for the end-Permian extinction and subsequent recovery.

Key Words: U-Pb geochronology • conodont • biostratigraphy • Permian • Triassic • extinction

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