Separate from developments in Afro-Eurasia and the Americas the region of greater Oceania continued to develop independently of the outside world. In Australia, the society of Aborigines and Melanesia changed little through the Post Classical Period since their arrival in the area from Africa around 50,000 BC. The only outside contact were encounters with fishermen of Indonesian origin. Polynesian and Micronesian Peoples are rooted from Taiwan and Southeast Asia and began their migration into the Pacific Ocean from 3000 to 1500 BC.