What Happened During the Younger Dryas Period?

It's that it's that crazy sort of up and down of temperature that happened. There was the bowling allerod period which had this up and down and then there was a very distinctive. You know deep freeze as we're slowly coming out is that deep freeze that come as we're coming out of the end of the pleistocene and that's that period called the younger driest. It's 12 800 or 900 years ago up to about 11 600 and we kind of get a jolt we get jolted down. Then we get jolted back out up back up again and ever since then more or less very stable climate. Very very consistent low slight warming Trend over time but then there's always been this what happened in this. In this period this younger driest period. And it sort of aligns roughly with the megaphone extinctions.