This came out last week. Article in the wapoo. One in press in PNAS IIRC. And the New Yorker.
Link to the scientific paper in Proceeding of National Academy of Science
https://www.pnas.org/content/early/2019/03/27/1817407116
Link the New Yorker Article (more interesting unless you are a Paleontologist, geologist, or geomorphologist)
https://www.newyorker.com/magazine/2019/04/08/the-day-the-dinosaurs-died