Cambrian-Ordovician extinction events
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The Cambrian-Ordovician extinction event occurred approximately 488 million years ago. It was the first major extinction event and eliminated many brachiopods, conodonts, and severely reduced the number of trilobite species. The Cambrian-Ordovician event ended the Cambrian period, and led into the Ordovician period in the Paleozoic era.
[edit] Theories of Cambrian-Ordovician extinction event
- Glaciation
- Depletion of oxygen in marine waters
[edit] Further reading
- Gradstein, Felix, James Ogg, and Alan Smith, eds., 2004. A Geologic Time Scale 2004 (Cambridge University Press).
- Hallam, A. and Paul B. Wignall, 1997. Mass extinctions and their aftermath (Oxford University Press).
- Webby, Barry D. and Mary L. Droser, eds., 2004. The Great Ordovician Biodiversification Event (Columbia University Press).
