11,800 BC - Comet strike - fragments continues to strike for over 100 years. Ended the Ice Age, caused the Younger Dryas, extincted mega fauna and, the Clovis peoples in North America - the prime area of the strike.
There were many other large impacts after the Chicxulub Dino killer but none 6.8 to 50.3km in size
Younger Dryas impact 13000 years ago in North America was last one.
Mammoth tusks with micro impacts are pretty conclusive evidence as is widespread black mat.
66,000,000 years ago, October 9th.
LOL - guess I was off by a few years...
(BTW this is the technique liberals used to create massive culture changes in a few short years, how they sold peak oil, ozone hole, acid rain, all birds dying from DDT, population bomb, global warming etc. etc,etc.)
Soon we'll have a department of Asteroid Protection... and lots of hysteria about needing to 'SAVE MOTHER EARF' from total destruction.
The psychological mechanisms that create this insanity and total rejection of reality is too complicated to write up in the few decades I might have left on this insane planet.