The most recent age/stage of the Holocene, 4250 BP to the present, dated from a dripstone in Mawmluh Cave, Meghalaya, India; Global Auxiliary Stratotype, Mount Logan Ice Core, Canada. The beginning of this age coincided with the abrupt onset of a 200-year drought and climatic cooling that affected agricultural societies throughout the world, linked to the collapse of civilizations and major migrations in Egypt, Greece, Syria, Palestine, Mesopotamia, the Indus Valley, and the Yangtze River Valley.