Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa |
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| Authors: | Ward Peter D Botha Jennifer Buick Roger De Kock Michiel O Erwin Douglas H Garrison Geoffrey H Kirschvink Joseph L Smith Roger |
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| Institution: | Department of Biology, University of Washington, Seattle, WA 98195, USA. argo@u.washington.edu |
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| 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. |
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