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.

Ward PD, Botha J, Buick R, De Kock MO, Erwin DH, Garrison GH, Kirschvink JL, Smith R.

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Department 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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Comment on "Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa". [Science. 2005]
Comment on "Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa".Marshall C. Science. 2005 Jun 3; 308(5727):1413; author reply 1413.

PMID:: 15661973; [PubMed - indexed for MEDLINE]

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