Coba jelasin Bacaan lanjutan dari Ordovisium dong

Ogg, Jim, June, 2004, Overview of Global Boundary Stratotype Sections and Points (GSSP's) http://www.stratigraphy.org/gssp.htm Accessed April 30, 2006.

Stanley, Steven M., Earth System History. New York: W.H. Freeman and Company, 1999. ISBN 0-7167-2882-6

Stanley, S.M. and Hardie, L.A. (1998). "Secular oscillations in the carbonate mineralogy of reef-building and sediment-producing organisms driven by tectonically forced shifts in seawater chemistry". Palaeogeography, Palaeoclimatology, Palaeoecology 144: 3-19.

Stanley, S.M. and Hardie, L.A. (1999). "Hypercalcification; paleontology links plate tectonics and geochemistry to sedimentology". GSA Today 9: 1-7.

Mehrtens, Dr. Charlotte, "Chazy Reef at Isle La Motte" . An Ordovician reef in Vermont.

Adrian Melott et al., "Did a gamma-ray burst initiate the late Ordovician mass extinction?" International Journal of Astrobiology 3 (2004) 55

BBC News, " Ray burst is extinction suspect", 11 April 2005.

ABC News, "Ray burst may have wiped out life on Earth", 29 April 2004

Wilson, M.A. and Palmer, T.J., 2001. Domiciles, not predatory borings: a simpler explanation of the holes in Ordovician shells analyzed by Kaplan and Baumiller, 2000. Palaios 16:524-525.

Wilson, M.A. and Palmer, T.J. 2006. Patterns and processes in the Ordovician Bioerosion Revolution. Ichnos 13: 109-112.