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The base of the Lystrosaurus Assemblage Zone, Karoo Basin, predates the end-Permian marine extinction

Author

Listed:
  • Robert A. Gastaldo

    (Colby College)

  • Sandra L. Kamo

    (University of Toronto, Toronto)

  • Johann Neveling

    (Council for Geosciences, Private Bag x112, Silverton)

  • John W. Geissman

    (The University of Texas at Dallas
    The University of New Mexico)

  • Cindy V. Looy

    (University and Jepson Herbaria, University of California–Berkeley)

  • Anna M. Martini

    (Amherst College)

Abstract

The current model for the end-Permian terrestrial ecosystem crisis holds that systematic loss exhibited by an abrupt turnover from the Daptocephalus to the Lystrosaurus Assemblage Zone (AZ; Karoo Basin, South Africa) is time equivalent with the marine Permian–Triassic boundary (PTB). The marine event began at 251.941 ± 0.037 Ma, with the PTB placed at 251.902 ± 0.024 Ma (2σ). Radio-isotopic dates over this interval in the Karoo Basin were limited to one high resolution ash-fall deposit in the upper Daptocephalus AZ (253.48 ± 0.15 (2σ) Ma) with no similar age constraints for the overlying biozone. Here, we present the first U-Pb CA-ID-TIMS zircon age (252.24 ± 0.11 (2σ) Ma) from a pristine ash-fall deposit in the Karoo Lystrosaurus AZ. This date confirms that the lower exposures of the Lystrosaurus AZ are of latest Permian age and that the purported turnover in the basin preceded the end-Permian marine event by over 300 ka, thus refuting the previously used stratigraphic marker for terrestrial end-Permian extinction.

Suggested Citation

  • Robert A. Gastaldo & Sandra L. Kamo & Johann Neveling & John W. Geissman & Cindy V. Looy & Anna M. Martini, 2020. "The base of the Lystrosaurus Assemblage Zone, Karoo Basin, predates the end-Permian marine extinction," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15243-7
    DOI: 10.1038/s41467-020-15243-7
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    Cited by:

    1. Jacopo Dal Corso & Robert J. Newton & Aubrey L. Zerkle & Daoliang Chu & Haijun Song & Huyue Song & Li Tian & Jinnan Tong & Tommaso Di Rocco & Mark W. Claire & Tamsin A. Mather & Tianchen He & Timothy , 2024. "Repeated pulses of volcanism drove the end-Permian terrestrial crisis in northwest China," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    2. Jun Shen & Jiubin Chen & Jianxin Yu & Thomas J. Algeo & Roger M. H. Smith & Jennifer Botha & Tracy D. Frank & Christopher R. Fielding & Peter D. Ward & Tamsin A. Mather, 2023. "Mercury evidence from southern Pangea terrestrial sections for end-Permian global volcanic effects," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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