The Cretaceous-Tertiary (K-Pg/K-T) boundary mass extinction is famously associated with a globally distributed iridium-enriched clay layer, interpreted as evidence of a large asteroid impact (the Chicxulub impactor) that is widely credited with causing (or contributing to) the extinction event, including that of the non-avian dinosaurs.
The Cretaceous/Tertiary (K-Pg) boundary is marked worldwide by a thin clay layer with anomalously high iridium concentrations, first identified by Alvarez and colleagues, providing key...
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