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

K-Pg

Fig. 3: An example of distal ejecta deposits. In the Agost section (Spain), the K-Pg boundary is at the base of a dark, several cm-thick, clay layer (indicated by the arrow). Photo courtesy of Dr. Raul Esperante.

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