Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa.
نویسندگان
چکیده
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.
منابع مشابه
Comment on "Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa".
We welcome the examination by Marshall (1) of our study (2), particularly his corrected statistical analysis of confidence intervals on stratigraphic ranges, which we accept. We believe, however, that in the process he has misinterpreted both our original data and his own reanalysis. We argued for both gradual and abrupt aspects to the Permian-Triassic (P-T) extinction, whereas Marshall suggest...
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ورودعنوان ژورنال:
- Science
دوره 307 5710 شماره
صفحات -
تاریخ انتشار 2005