The beginning of the end of the last Ice Age.
"The beginning of the end of the last Ice Age."
Actually, the end of the cooling of the Younger Dryas. There was a warmer phase between 18,000 years ago and the YD, 12,500 years ago.
This probably explains the orthodoxy problem in North America, where archeologist stopped looking when they found Clovis points. The Clovis were probably part of the post YD recovery. Now that they are digging deeper they are finding older remains, 14 and 15,000 years old.