In a new study, anthropologists in Australia argued that hominins arrived on the continent a little later than academia previously determined. It wasn\u2019t 65,000 years ago; it was about 50,000.<\/p>\n
\u201cWhen did humans first colonize Australia?\u201d That question propelled a team of researchers from Australia\u2019s La Trobe University to reevaluate the validity of the accepted arrival date against material evidence.<\/p>\n
In a recent press release, the authors of a new study published in Archaeology in Oceania explained that previous studies suggest that Homo sapiens and Neanderthals interbred only once, between 43,500 and 51,500 years ago.<\/p>\n
As Australians, much like everyone else, have 1-4% Neanderthal DNA in their genes, researchers logically deduced that hominins couldn\u2019t have arrived any time before that, which would call into question a fundamental belief concerning human migration.<\/p>\n
Researchers reexamined archaeological sites to determine a piece in the early human puzzle that never quite fit. As the press release states, \u201cAboriginal Australian culture is regarded as humanity\u2019s oldest continuous living culture. \u201d So, having the correct date is essential. They discovered that the fields of anthropology and history might have to update the history books.<\/p>\n
When did humans arrive in Australia?<\/p>\n
In 2017, a study of a seminal archaeological site in Australia known as Magjedbebe determined, using optically stimulated luminescence (OSL), that it dated between 59,000 and 70,000 years ago. This site played a central role in pinpointing the presence of hominins in Australia.<\/p>\n
The authors of the most recent study (2025) stated in a press release that the methods used might have accurately dated sand deposits but not the artifacts that they contained. OSL, the technique, reads minerals almost like a clock that stores energy. Radiation accumulates when minerals are buried and is released when exposed to light.<\/p>\n
That being said, the site experienced sand deposition. In other words, material artifacts moved down these deposits over time in Magjedbebe, much like other sites in Australia. The press release continues that because these artifacts were heavier than the sand could settle, previous studies might not have accounted for different dates coexisting.<\/p>\n
Study authors argue that the actual dating of most archaeological sites in Australia would fall between 43,000 and 54,000 years. Referring to the timeframe during which Neanderthals and\u00a0Homo sapiens\u00a0mated, anthropologist and lead author James O\u2019Connell said in the press release, \u201cThe colonization date falls within that interval.\u201d<\/p>\n
\u201cThat puts it in the same time range as the beginning of the displacement of Neanderthal populations in western Eurasia by anatomically modern humans.\u201d<\/p>\n
But that\u2019s not all.<\/p>\n
Humans couldn\u2019t get to Australia, literally<\/p>\n
O\u2019Connell and his colleagues pointed to the real obstacles the first Sahul peoples faced in Australia. They likely traveled on rafts and canoes from Southeast Asia. So, they would have to have the capacity to engineer these vessels that could cross 930 miles and island-hop through Indonesia. According to the study authors, the sheer achievement of the distance crossed further supports their hypothesis.<\/p>\n
\u201cThis strongly suggests that colonizing passage was deliberate, not accidental,\u201d O\u2019Connell said, adding that it \u201crequired sturdy rafts or canoes capable of holding, say, 10 or more people each plus the food and water needed to sustain those folks on open ocean voyages of up to several days, and of making headway against occasionally contrary ocean currents.\u201d<\/p>\n
Moreover, technological prowess and know-how would harmoniously align with other advancements, innovations, and behavioral shifts after the 50,000-year mark<\/a>. However, as per the press release, the \u201c50,000-year hypothesis,\u201d as it\u2019s called, has been circulating since 2018. Four separate genetics studies have concluded that hominins<\/a> couldn\u2019t have arrived earlier than 55,000 years ago.<\/p>\n In the press release, O\u2019Connell concluded<\/a> that he expects the field to adopt the 50,000-year hypothesis in the next five years or so.<\/p>\n \u201cIt links up with the broader Eurasian record of an out-of-Africa population<\/a> wave that spreads across Eurasia\u2014a process that occurs over several thousand years. That raises all kinds of questions about why it happens, what it involves, what prompts it, and what changes in behavior are indicated in greater detail than they are now.\u201d<\/p>\n