What type of evidence supports the theory that the Cretaceous-Paleogene extinction was caused by an asteroid strike?

An impact crater dated to about 66 million years ago, along with tsunami deposits from the same time, is direct evidence of a major asteroid impact. This supports the theory that an asteroid strike caused the Cretaceous-Paleogene extinction. Banded-iron formations, stromatolites, and coal seams do not specifically indicate an impact.

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