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Microbial communities and mass extinctions¦Online meeting
5 June, 7:30 pm-9:30 pm
Your RSVP is ESSENTIAL – you will then receive the Google Meet link with your confirmation email.
Our presenter at tonight’s ONLINE meeting will be Prof. Kliti Grice (John Curtin Distinguished Professor). Kliti Grice is Founding Director of WA-Organic and Isotope Geochemistry Centre, School of Earth and Planetary Sciences at Curtin University
Prof. Grice will discuss how microbial communities were associated with mass extinctions and their role in exceptional fossil preservation. The largest mass extinction, about 252 Ma years ago (the end-Permian event), occurred when climate forces led to low atmospheric oxygen levels with a parallel rise in concentrations of carbon dioxide and hydrogen sulfide. The ocean circulation became highly sluggish, and some 90 per cent of marine and 75 per cent of terrestrial species became extinct. This event contrasts markedly with the end-Cretaceous extinction event that destroyed the non-avian dinosaurs. The end-Permian event was not initiated by a meteorite impact but by climatic effects related to the aggregation of the supercontinent Pangea and volcanism released from the Siberian traps.