Journal
GEOLOGY
Volume 34, Issue 12, Pages 1053-1056Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G22827A.1
Keywords
U-Pb geochronology; conodont; biostratigraphy; Permian; Triassic; extinction
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Four voleanic-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 similar to 5 m.y. This time constraint must be considered in any model for the end-Permian extinction and subsequent recovery.
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