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Another good historical perspective from this blog: http://lablemminglounge.blogspot.com/2006/09/iridium-anomaly-as-historical-artifact.html Iridium anomaly as historical artifact Everybody knows that way back in 1980, Alvarez et al. showed that Italian sediments deposited on the Cretaceous / Tertiary boundary (and NOT the Cretaceous / Paleogene boundary, I ...


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