Far earlier than many textbooks suggest, ancient voyagers were already crossing dangerous seas toward a very different-looking Australia.
Fresh genetic research now argues that the first people reached the combined landmass of Australia and New Guinea around 60,000 years ago, reshaping debates about when humans spread across the globe and how skilled they were at early seafaring.
Ancient continent, ancient journeys
During the last Ice Age, sea levels were far lower than today. Australia, New Guinea and Tasmania formed a single vast continent, known as Sahul. To reach it, early Homo sapiens still had to cross open water from Southeast Asia, navigating strong currents and unfamiliar coasts.
A new international study led by scientists at the University of Huddersfield and the University of Southampton argues that those first crossings happened significantly earlier than some genetic models had suggested in recent years.
New DNA evidence backs a “long chronology”, placing the first settlement of Sahul at roughly 60,000 years ago.
The work combines archaeogenetics, maritime archaeology, earth science and oceanography, reflecting how complex this migration story really is.
Long versus short timeline for first Australians
Archaeologists, geneticists and anthropologists have long debated when people first reached Sahul. Radiocarbon dates from archaeological sites and stone tools have pointed to very early settlement, yet interpretations differ.
Within Western scientific research, two broad views have dominated:
- Long chronology: humans arrived around 60,000 years ago or slightly earlier
- Short chronology: first settlement closer to 45,000–50,000 years ago
Many Aboriginal communities describe an unbroken connection to Country that stretches back “forever”. The scientific timelines cannot capture the full depth of that cultural understanding, but they attempt to date when people first set foot on Sahul, at least in terms of physical arrival.
What the new DNA study actually did
Following maternal lineages through time
The team focused on mitochondrial DNA (mtDNA), a small ring of genetic material passed down from mothers to their children. Because it does not mix with paternal DNA, mtDNA allows researchers to trace maternal lineages with fine detail.
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Scientists gathered nearly 2,500 mtDNA genomes from Aboriginal Australians, New Guineans and neighbouring populations from Southeast Asia and the western Pacific. They then built a giant family tree of these lineages.
By measuring how much the mitochondrial lineages have changed, researchers used a “molecular clock” to estimate when different branches split.
In genetics, the molecular clock is based on the steady rate at which mutations accumulate. The more differences between two lineages, the further back in time they shared a common ancestor.
Oldest lineages rooted firmly in Sahul
The team found that the oldest mtDNA lineages present in Aboriginal Australians and New Guineans, and absent elsewhere, cluster around 60,000 years ago. These lineages appear to have arisen in Sahul after the first settlers arrived.
Their genetic ancestors point back to Southeast Asia. But the pattern is not simple. Most Sahul-related lineages link to northern parts of Southeast Asia, such as northern Indonesia and the Philippines. A smaller but still significant group connects to southern Indonesia, Malaysia and Indochina.
The dual ancestry suggests at least two main seafaring routes into Sahul, reaching land at roughly the same period.
This fits with earlier computer simulations and archaeological models that proposed multiple likely crossing points, including routes via what are now the Lesser Sunda Islands and possibly through the north near present-day New Guinea.
Why this challenges recent genetic thinking
Over the last few years, some large-scale genomic studies had leaned towards a shorter chronology, placing the arrival of humans in Sahul closer to 50,000 years ago. Those interpretations created tension with some archaeological dates and environmental reconstructions, which hinted at earlier human presence.
The new mitochondrial analysis pushes back against that trend. It argues that the genetic data, when re-examined with different assumptions about mutation rates, align better with an older settlement date.
Lead researchers stress that mtDNA is only one part of the story. A human genome contains around 3 billion base pairs, compared with roughly 16,000 in mitochondrial DNA. Ongoing work will use hundreds of full genomes from populations across the region to test whether the broader genetic picture supports the same timeline.
Rewriting early seafaring history
Beyond dates on a chart, the findings highlight the maritime skill of the first people reaching Sahul. To cross from Southeast Asia, they had to organise groups, build watercraft and plan journeys across gaps of open ocean, sometimes out of sight of land.
These were not accidental castaways: they were deliberate voyagers with knowledge of coasts, currents and winds.
Maritime archaeologists at Southampton have previously modelled how early humans could have travelled across island chains using simple rafts, canoes or other vessels. The new genetic timelines suggest this kind of sea travel was already well established tens of millennia before later Pacific voyages that led to the settlement of far-flung islands like Hawaii and Easter Island.
Deep heritage for Indigenous communities
The research underscores the extraordinary timespan of Aboriginal and Papuan presence in the region. Tens of thousands of years of cultural continuity, adaptation and story-telling took place on landscapes that were later drowned by rising seas at the end of the Ice Age.
Many coastal plains that once formed part of Sahul now lie underwater. Oral histories in some communities speak of changing shorelines and lost lands, which some researchers think may echo ancient sea-level rise.
How this fits with archaeology and climate
Archaeological evidence from Australia and New Guinea has long hinted at very early settlement. Stone tools, hearths and other remains at some sites appear to push back occupation toward 60,000 years ago, though dating ancient sediments is technically challenging.
The new genetic work lines up more neatly with these older archaeological signals than some recent short-chronology genetic models. It also fits with broader patterns of human expansion out of Africa and across Eurasia between 60,000 and 70,000 years ago.
| Evidence type | What it shows | Approximate timing |
|---|---|---|
| Archaeological sites | Stone tools, hearths, occupation layers in Australia and New Guinea | Up to ~60,000 years ago |
| mtDNA lineages | Unique maternal lines shared by Aboriginal Australians and New Guineans | Origins dating to ~60,000 years ago |
| Sea-level reconstructions | Modelled land connections and sea gaps between Asia and Sahul | Last Ice Age, 70,000–20,000 years ago |
What could change with future data
The researchers are cautious about treating any single study as the final word. Molecular clocks depend on assumptions about how fast mutations accumulate, and these rates can be revised as more ancient DNA and archaeological data appear.
Future work on complete genomes from people across Southeast Asia and Oceania may refine the timing further. Ancient DNA from human remains in the region, if preserved well enough to sequence, could provide direct snapshots of the population structure at different moments in the past.
As methods improve, models for how many migration waves occurred, and how they mixed, will likely grow more detailed.
Key terms and why they matter
The debate around this research often uses technical language that can hide the real story. Three concepts are especially useful:
- Sahul: the Ice Age megacontinent that combined modern Australia, New Guinea and Tasmania. Understanding Sahul reminds us that early migrants were settling a single landmass, not separate countries.
- Mitochondrial DNA (mtDNA): a tiny portion of our genetic code, inherited only from mothers. It is a powerful tool for tracing maternal ancestry and timing migrations, although it represents just one branch of our family tree.
- Molecular clock: a method that uses the rate of genetic changes to estimate dates. Clocks can tick a bit faster or slower depending on calibration, so scientists compare them with archaeological dates to keep them realistic.
Together, these tools help build a layered picture: when people moved, how many groups were involved and which routes they likely took.
Thinking about early voyages in practical terms
Imagining these journeys in everyday terms makes their scale clearer. Crossing even a 20–30 kilometre sea gap without modern navigation is hazardous. Groups would have needed watercraft sturdy enough for families and supplies, knowledge of seasonal winds, and ways to keep people together in poor visibility.
One scenario suggested by computer models is that people may have used stepping-stone routes, moving gradually along chains of islands until the final crossings into Sahul. That pattern matches the dual genetic ancestry from both northern and southern parts of Southeast Asia.
Such early maritime mobility likely had knock-on effects. It enabled people to track shifting resources, respond to climate swings and maintain connections between distant groups. The skills developed in these crossings may have laid foundations for later, long-distance seafaring traditions across the Pacific.