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

Suvasvesi_shocked_quartz

Microphotograph of shocked quartz grain with two sets of planar deformation features (PDFs) in impact melt rock. This example comes from the Suvasvesi South impact structure, Finland. Image courtesy of Martin Schmieder (CC BY 3.0)

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