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SUMMARY:Late Ordovician extinction
DESCRIPTION:This presentation has since taken place\, you can view the film recording here. \nWilliam Schmachtenberg \n \nAbstract: \nThere have been at least 5 mass extinctions in the geologic past and some say there was a sixth.  Multiple theories from volcanism\, plate tectonics\, biotic interactions\, and changes to ocean chemistry have been proposed for these extinction events. Local field studies in Virginia has shed light on the Late Ordovician extinction when 86% of animals in the ocean perished. These data will be given in the presentation. Studies like this one are important in answering the question will there be another mass extinction in the future? \n  \n  \n  \n  \nby Dr. William F. Schmachtenberg (Dae Miami SL)  \nPrevious work in the Film Collection \n  \nRelated Hypothesis article “The Cracks in Time” \n  \n  \nIs this the first time you will attend a presentation with us?\nFollow this link first. \n 
URL:https://sciencecircle.org/event/late-ordovician/
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