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New evidence suggests it was matter ejected from the Chicxulub crater that led to impact winter.
by Bob Yirka
But one area of contention has remained: the source of the material in K–Pg boundary records. In this new effort, the researchers suggest that while some of the material in K–Pg boundary records is likely from such burnt material, most of it came from material ejected from the crater at the impact site.
https://phys.org/news/2020-09-evidence-ejected-chicxulub-crater-impact.html
Paper:
@corlin 👍🏿
https://www.pbs.org/video/day-the-dinosaurs-died-rooax3/