Late Permian global coal hiatus linked to super 13 C-depleted C0 sub 2 flux into the atmosphere during the final consolidation of Pangea: comment and reply

Article Abstract:

Kevin Faure, Maarten J. de Wit, and James P. Willis' 'Late Permian global coal hiatus linked to super 13 C-depleted C0 sub 2 flux into the atmosphere during the final consolidation of Pangea' suggests a shift toward more negative delta 13 C values over the P/Tr boundary instead of more positive values. However, more positive values are expected since the Triassic is a warmer period compared to the Permian. Environmental parameters that occur during warmer periods have a positive shifting effect on the delta 13 C values.

Analysis, Natural history, Coal, Geology

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Evidence for abrupt latest Permian mass extinction of foraminifera: results of tests for the Signor-Lipps effect: comment and reply

Article Abstract:

Michael R. Rampino and associate presented proof for abrupt latest Permian mass extinction of foraminifera. They plotted the number of last occurrences of foraminifera against distance below the Permian-Triassic (P-tr) boundary and showed that 85% of taxa disappeared at the top of the Bellerophon Formation. However, inclusion of higher foraminiferal occurrences in their analysis would have extended the duration of the extinction interval.

Mass extinction, Mass extinction theory, Foraminifera, Rampino, Michael R.

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Tempo of the end-Permian event: high-resolution cyclostratigraphy at the Permian-Triassic boundary

Article Abstract:

Wavelet analysis of deposit continuity across the Permian-Triassic boundary suggests a catastrophic cause for the largest mass extinction in the geologic record. Faunal changes at this boundary can be constrained with an interval of 60,000 to 80,000 years.

United States, Extinction (Biology)

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