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End-Triassic Extinction biotic and environmental change ~200 million years ago


Ein ProMare-Vortrag von Dr. Jozsef Palfy
(Hungarian Natural History Museum, Budapest)
Donnerstag, 5. November 2009, 18:00, Raum 2B 201, GEOZENTRUM Althanstraße 12, 1090 Wien 
Eintritt: freie Spende
Vortrag in englischer Sprache

In the context of the current global environmental and climate change which threatens the ecosystems around us, much can be learned from mass extinction events and correlated environmental change in the geological record. One of the least understood of the five largest extinctions is the end-Triassic event, which nevertheless has been subject to much current research. In this presentation, I will provide 1) a geochronological (temporal) framework of the Triassic-Jurassic boundary to allow correlation of various events; 2) an analysis of the fossil record of some key groups to compare biotic records in the terrestrial and marine realms and to settle controversial claims of sudden versus gradual extinction; 3) a discussion of environmental proxy records, focusing primarily on the carbon isotope curves; and 4) an evaluation of various scenarios proposed to explain the series of end-Triassic events. Finally, I will discuss the significance of an Austrian Triassic-Jurassic boundary section which awaits the final approval to become the international standard (Global Stratotype Section and Point) for this crucial boundary in Earth history.