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1 Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA
2 South African Museum, P.O. Box 61, 8000 Cape Town, South Africa
3 Earth Sciences Department, University of California, Santa Cruz, California 95064, USA
4 Department of Geological Sciences, Box 351310, University of Washington, Seattle, Washington 98195, USA
The rate, timing, and pattern of change in different regions and paleoenvironments are critical for distinguishing among potential causes for the Permian-Triassic (P-T) extinction. Carbon isotopic stratigraphy can provide global chronostratigraphic control. We report a large 
13C excursion at the P-T boundary and no long-term Permian 13C trends for samples from the interior of Pangea. Stratigraphic gaps between available samples limit the resolution of our 13C curve, but the excursion is within a 15-m-thick zone of overlap between Permian and Triassic taxa. Sedimentological and taphonomic observations demonstrate that this 15 m interval does not represent geologically instantaneous deposition. Together these data support a rapid and globally synchronous P-T event, but suggest that it occurred over a geologically resolvable interval of time.
Key Words: Permian-Triassic extinction • carbon isotopes • chemostratigraphy • therapsids • Karoo basin • South Africa
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