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Reference.org
Iridium anomaly
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<p>The term iridium anomaly commonly refers to an unusual abundance of the <a href="/facts/Chemical_element/0jducgWD">chemical element</a> <a href="/facts/Iridium/TFQutoj1">iridium</a> in a layer of rock <a href="/facts/Stratum/w5D4VAwa">strata</a> at the <a href="/facts/Cretaceous%E2%80%93Paleogene_boundary/5056Agsq">Cretaceous–Paleogene</a> (K–Pg) boundary. The unusually high concentration of a rare metal like iridium is often taken as evidence for an <a href="/facts/Extraterrestrial_materials/G3TdepXj">extraterrestrial</a> <a href="/facts/Impact_event/fbWu9Q4p">impact event</a>. </p>