Cambrian–Ordovician extinction events
- Cambrian–Ordovician extinction events
The Cambrian–Ordovician extinction event occurred approximately 488 million years ago. It was the first major extinction event in the Phanerozoic eon and it eliminated many brachiopods and 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.
Theories of Cambrian-Ordovician extinction event
* Glaciation
* Depletion of oxygen in marine waters
See also
* Geologic time scale
* Furongian
* Early Ordovician
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).
External links
* [http://www.scotese.com/eordclim.htm Early Ordovician Climate]
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