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== Literat ==
* Ogg, Jim, June, 2004, ''Overview of Global Boundary Stratotype Sections and Points (GSSP's)''. http://www.stratigraphy.org/gssp.htm
*Stanley, Steven M., ''Earth System History''. New York: W.H. Freeman and Company, 1999. ISBN 0-7167-2882-6
*[http://www.anr.state.vt.us/dec/geo/chazytxt.htm Mehrtens, Dr. Charlotte, "Chazy Reef at Isle La Motte"]. An Ordovician reef in Vermont.
*[http://arxiv.org/abs/astro-ph/0309415 Adrian Melott et al., "Did a gamma-ray burst initiate the late Ordovician mass extinction?"] ''International Journal of Astrobiology'' '''3''' (2004) 55
*[http://news.bbc.co.uk/2/hi/science/nature/4433963.stm BBC News, " Ray burst is extinction suspect"],
*[http://www.abc.net.au/science/news/stories/s1097756.htm ABC News, "Ray burst may have wiped out life on Earth"],
== Yüms plödik ==
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