In summary, the meteorite collided with a small shallow sea, and vaporized a large volume of sulfur-containing gypsum deposits. The sulfur in the atmosphere int

In summary, the meteorite collided with a small shallow sea, and vaporized a large volume of sulfur-containing gypsum deposits. The sulfur in the atmosphere interacted with water in the atmosphere and formed sulfuric acid in sufficiently large quantities to cool the earth by about 10C, and make photosynthesis non-viable everywhere on earth for long enough that large herbivorous dinosaurs incapable of hibernation died off entirely.