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, 307 (5710), 709-14

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

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

Peter D Ward et al. Science.

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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