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Project Progress

A manuscript was completed on a carbon isotopic, palynological and carbon-cycle modeling study of a non-marine Permian-Triassic boundary section in the Sydney Basin, Australia, showing that multiple isotopic excursions separate two mass-extinction horizons. The data are incompatible with a single impact event causing carbon-cycle perturbation and concomitant mass-extinction, as well as with most other proposed kill mechanisms for the Permian-Triassic. Modeling supports an oceanographic explanation for the isotopic excursions and the mass extinction(s).