Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa

Author:

Ward Peter D.12345,Botha Jennifer12345,Buick Roger12345,De Kock Michiel O.12345,Erwin Douglas H.12345,Garrison Geoffrey H.12345,Kirschvink Joseph L.12345,Smith Roger12345

Affiliation:

1. Department of Biology, University of Washington, Seattle, WA 98195, USA.

2. Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA.

3. Karoo Paleontology, Iziko: South African Museum, Cape Town, South Africa.

4. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.

5. Department of Geology, Rand Afrikaans University, Johannesburg, South Africa.

Abstract

The Karoo basin of South Africa exposes a succession of Upper Permian to Lower Triassic terrestrial strata containing abundant terrestrial vertebrate fossils. Paleomagnetic/magnetostratigraphic and carbon-isotope data allow sections to be correlated across the basin. With this stratigraphy, the vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permian-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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