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(Pleistocene, Palaeolithic - 10th millennium BC - 9th millennium BC - other millennia) Events: 10000 BC - Beggining of Jomon era in Japan. 9600 BC -- End of the Younger Dryas cold period -- boundary between Pleistocene and Holocene and traditionally the boundary between the Palaeolithic and Mesolithic. Before 9000 BC - First stone structures at Jericho.