Chixculub impact predates the K-T boundary mass extinction
- Author: Keller, G.; Adatte, Th.; Stinnesbeck, W.; Rebolledo-Vieyra, M.; Fucugauchi, J.U.; Kramar, U. and Stüben, D.
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Source:
Proceedings of the National Academy of Sciences of the United States of America, vol. 101, no. 11, pp. 3753-3758 (2004)
(http://www.pnas.org/cgi/content/abstract/101/11/3753)