Prehistory Decoded at Gobekli Tepe: From a Cataclysmic Event Dawns the Origin and Perhaps the End of Civilization
Nearly 13,000 years ago millions of people and animals were wiped out and the world plunged abruptly into a new ice-age. Known as the Younger Dryas event. It was more than a thousand years before the climate and mankind recovered.
Source: ancient-origins.net