Meanwhile, over the Cretaceous Gulf of Mexico…

Heat-trapping asteroid dust may have incinerated the dinosaurs within hours sciencenews.org

The asteroid that ended the Cretaceous may have killed far faster than anyone modeled. Fine dust thrown into the upper atmosphere trapped the heat of re-entering debris, turning the sky into a broiler within minutes and potentially cooking exposed animals worldwide in the first hours — not the slow, dark starvation long assumed.