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Science. 2005 Feb 4;307(5710):709-14. Epub 2005 Jan 20.

Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa.

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  • 1Department of Biology, University of Washington, Seattle, WA 98195, USA. argo@u.washington.edu

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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PMID:
15661973
[PubMed - indexed for MEDLINE]
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