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== Bacaan lanjutan ==
* Stephen hawking, the greaytest barrier.›
* Neal L Larson, Steven D Jorgensen, Robert A Farrar and Peter L Larson. ''Ammonites and the other Cephalopods of the Pierre Seaway''. Geoscience Press, 1997.
* Ogg, Jim; June, 2004, ''Overview of Global Boundary Stratotype Sections and Points (GSSP's)'' http://www.stratigraphy.org/gssp.htm Accessed April 30, 2006.
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