Suddenly, all eyes looked to the heavens to catch a horrifying glimpse of a blazing fireball, blotting out the sun and streaking down toward the ocean. An instant later, a white hot flash of superheated gasses scoured the Earth with temperatures near the heat of the sun in every direction for over 200 miles.
A gigantic mushroom cloud of ejected debris and ash formed overhead and spread across the globe obscuring the sun and within weeks it had eradicated life giving photosynthesis everywhere.
Temperatures dropped to freezing, plant life withered worldwide. Even plankton in the oceans died. The basic building blocks of the food chain on Earth were destroyed. Doomsday 65 million B.C. had begun.
K-T boundary, a persistent worldwide chalk like layer of sedimentary material, that circles the Earth like a ribbon, running through rock striations at a specific depth on every continent.
This is the historical remnant of billions of tons of material ejected thousands of feet into the atmosphere, eventually settling back to Earth, smothering what might have survived the loss of sunlight and freezing temperatures, like blanket.