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Date: 2003-04-09 18:56:01Geological history of Earth Extinction events Walter Alvarez Frank Asaro Uniformitarianism K–T boundary Impact event Iridium anomaly Chicxulub crater Historical geology Geology Geologic time scale | 2002 Medals and Awards PENROSE MEDALAdd to Reading ListSource URL: www.geosociety.orgDownload Document from Source WebsiteFile Size: 460,42 KBShare Document on Facebook |