The asteroid was totally vaporized by the energy of the collision. It left a thin layer of iridium deposits across the entire planet which can be seen in the fossil record. We found the impact crater in the Gulf of Mexico just north of the Yucatan peninsula.
https://en.wikipedia.org/wiki/Cretaceous–Paleogene_boundary
https://en.wikipedia.org/wiki/Chicxulub_crater
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