The prehistory of Australia is the period between the first human habitation of the Australian continent and the colonisation of Australia in 1788, which marks the start of consistent written documentation of Australia. This period has been variously estimated, with most evidence suggesting that it goes back between 50,000 and 65,000 years. This era is referred as prehistory rather than history because knowledge of this time period does not derive from written documentation. However, some argue that Indigenous oral tradition should be accorded an equal status. A hunter-gatherer lifestyle was dominant until the arrival of Europeans, although there is evidence of land management by practices such as cultural burning, and in some areas, agriculture, fish farming, and permanent settlements. Early human migrations#Near OceaniaHistory of Indigenous Australians#Origins and Aboriginal Australians#Origins The earliest evidence of humans in Australia has been variously estimated, with most agreement that it dates from between 50,000 and 65,000 years BP. There is considerable discussion among archaeologists as to the route taken by the first migrants to Australia, widely taken to be ancestors of the modern Aboriginal peoples. Migration took place during the closing stages of the Pleistocene, when sea levels were much lower than they are today. Repeated episodes of extended glaciation during the Pleistocene epoch resulted in decreases of sea levels by more than 100 metres in Australasia. People appear to have arrived by sea during a period of glaciation, when New Guinea and Tasmania were joined to the continent of Australia. The continental coastline extended much further out into the Timor Sea, and Australia and New Guinea formed a single landmass (known as Sahul), connected by an extensive land bridge across the Arafura Sea, Gulf of Carpentaria and Torres Strait. Nevertheless, the sea still presented a major obstacle so it is theorised that these ancestral people reached Australia by island hopping. Two routes have been proposed.