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1 Earth and Environmental Science Program, New York University, 100 Washington Square East, New York, New York 10003, USA, and NASA, Goddard Institute for Space Studies, 2880 Broadway, New York, New York 10025, USA
2 Department of Earth Sciences, University of Ottawa, 365 Nicholas Street, Ottawa, Ontario K1N 6N5, Canada
3 Department of Physics, New York University, 2-4 Washington Place, New York, New York 10003, USA
The Permian-Triassic (P-T) boundary is marked by the most severe mass extinction in the geologic record. High-resolution cyclostratigraphy on a 104 yr scale across the P-T boundary in a core from the Carnic Alps (Austria) revealed significant cycles in the ratio 
40:10:4.7:2.3 m, identified with Milankovitch cycles of 412:100:40:20 k.y. (eccentricity 1 and 2, obliquity, and precession). Wavelet analysis indicates continuity of deposition across the boundary, with an average accumulation rate of 10 cm/k.y. The dramatic faunal changes at the P-T boundary can be constrained within an interval of <60 k.y. (possibly <8 k.y.), with the accompanying sharp negative global carbon-isotope shift within <30 k.y., suggesting a catastrophic cause.
Key Words: Permian-Triassic boundary • Milankovitch cycles • extinctions • cyclostratigraphy
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