EntityQ1276327· pop 10· linked from 28 articlesiridium anomalySign in to savethin layer of the element iridium in rock strata at the Cretaceous–Paleogene boundaryConnectionsMexicoCountrygeologyEntitychemical elementEntitydinosaurEntityInternational Standard Book NumberEntityiridiumEntityclayEntitydigital object identifierEntityEarth's crustEntityInternational Standard Serial NumberEntityYucatan PeninsulaEntityCretaceousEntitymeteoriteEntityphysicistEntityLuis Walter AlvarezEntityPaleogeneEntityQ180686Entityimpact craterEntitybibcodeEntityextinction eventEntityCategoriesCretaceous–Paleogene boundaryIridium