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,2
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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