Lead author and ANU PhD candidate Hendri Kaharudin emphasized the importance of the discovery's location at Elivavan on Indonesia's Tanimbar islands.
"Tanimbar is located just off the 'Sahul shelf', which encompasses modern-day Australia, as well as New Guinea," he said.
"The question of how our early ancestors arrived there from Southeast Asia is one of the most captivating in prehistoric migration, mainly because of the vast distances covered and advanced seafaring skills that would have been required.
"There are two main routes that have been explored as possibilities since the mid-20th century - a northern path via islands like Sulawesi, and a southern track passing near Timor and the Tanimbar islands.
"This discovery marks one of the southern route's earliest known sites, making it a crucial piece of the puzzle."
According to the researchers, while there are still unanswered questions about Elivavan's first inhabitants, the risky nature of the sea crossings suggests the colonists had developed advanced maritime technology by around 42,000 years ago.
"They would have had to traverse bodies of water exceeding 100 kilometres in distance, regardless of their direction of travel," Mr Kaharudin said.
"Along with tiny fragments of pottery we also found evidence of things like bones, shells, and sea urchins that point to the island's role as a hub for early maritime activities.
"As more work is done in lesser-explored regions like the Tanimbar islands, I expect we'll uncover more about early human life and migration patterns."
Mr Kaharudin said it's also clear the colonization of Sahul was not a single event but "a gradual process involving successive waves of seafaring populations."
"Coastal communities likely navigated shorelines, exploiting marine resources and establishing resilient settlements along their journey," he said.
"This island-hopping strategy facilitated cultural exchange and adaptation, shaping diverse societies across the land mass."
The study was conducted in collaboration with Indonesia's National Research and Innovation Agency (BRIN). The research team also included Professor Sue O'Connor and Dr. Shimona Kealy from ANU.
Research Report:Islands on the edge: 42,000-year-old occupation of the Tanimbar islands and its implications for the Sunda-Sahul early human migration discourse
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