What is the evidence for a large asteroid impact at the Cretaceous-Paleogene (K-Pg) boundary?

alvarez

Fig. 1: Physicist Luis Alvarez and his geologist son Walter, next to the thin dark clay layer, sandwiched between limestone beds, outcropping near Gubbio, Italy. This is one of the initial localities where the iridium anomaly was first detected. Image courtesy of Berkeley Lab (CC BY-NC-ND 2.0)

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