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Science 11 April 1997:
Vol. 276. no. 5310, pp. 235 - 238
DOI: 10.1126/science.276.5310.235
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Reports

Permo-Triassic Boundary Superanoxia and Stratified Superocean: Records from Lost Deep Sea

Yukio Isozaki

Pelagic cherts of Japan and British Columbia, Canada, recorded a long-term and worldwide deep-sea anoxic (oxygen-depleted) event across the Permo-Triassic (or Paleozoic and Mesozoic) boundary (251 ± 2 million years ago). The symmetry in lithostratigraphy and redox condition of the boundary sections suggest that the superocean Panthalassa became totally stratified for nearly 20 million years across the boundary. The timing of onset, climax, and termination of the oceanic stratification correspond to global biotic events including the end-Guadalupian decline, the end-Permian extinction, and mid-Triassic recovery.

Department of Earth and Planetary Sciences, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152, Japan. E-mail: yisozaki{at}geo.titech.ac.jp

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