KT + 40 minutes. Debris sent into orbit by the Chicxulub meteorite begins to fall back in enormous quantities, vitrifying. It is now found all over the world in the thin KT layer. A sudden temperature change of several hundred degrees is created across the Earth’s surface (according to some simulations, over 800°C). Many life forms on the surface are exterminated. But even just a few centimeters below the surface, the temperature could be acceptable for many living species, including mammals.
