Forty Thousand Years Ago on Sulawesi: Did Two Human Species Meet Face to Face—and Why Did Only One Survive?
Archaeologists working in Sulawesi, Indonesia, have uncovered evidence that could fundamentally alter how we understand human evolution in Southeast Asia. New excavations suggest that Homo sapiens may have shared this island with an archaic, now-extinct human species more than 65,000 years ago. If confirmed, this would raise a profound question: Did different human species coexist—and possibly interact—in Wallacea?
An international research team believes the answer may lie deep beneath the floor of a limestone cave known as Leang Bulu Bettue.
Sulawesi Archaeology and the Search for Human Overlap
Located in the Maros-Pangkep karst region of southern Sulawesi, Leang Bulu Bettue has been the focus of archaeological excavations since 2013. These efforts, led by Griffith University, aim to reconstruct a long and continuous record of human occupation on the island.
Researchers now report a near-continuous archaeological sequence extending at least eight meters below the cave floor. These layers preserve traces of human activity that predate the arrival of modern humans on Sulawesi, making the site one of the most significant Pleistocene records in Island Southeast Asia.
The findings were published in PLOS ONE under the title “A near-continuous archaeological record of Pleistocene human occupation at Leang Bulu Bettue, Sulawesi, Indonesia.”
Pleistocene Human Occupation in Sulawesi: A Timeline Reconsidered
Earlier studies already showed that archaic hominins occupied Sulawesi at least 1.04 million years ago. By contrast, most researchers believe Homo sapiens reached the island shortly before the first settlement of Australia, around 65,000 years ago.
What makes Leang Bulu Bettue exceptional is the depth and continuity of its cultural deposits. According to lead author Basran Burhan, a Griffith University Ph.D. candidate from South Sulawesi, the cave now stands as a flagship site for testing whether these two human lineages overlapped in time.
Could Sulawesi have been a rare meeting ground for multiple human species?
Stone Tools, Butchery, and Archaic Human Culture
The deepest layers of the cave reveal evidence dating to earlier than 132,000–208,000 years ago. These deposits contain signs of animal butchery and stone tool production, including large, heavy-duty implements known as picks.
Importantly, these activities occurred long before Homo sapiens left Africa.
According to Professor Adam Brumm of Griffith University’s Australian Research Centre for Human Evolution, these findings reflect a distinct archaic hominin cultural tradition. That tradition appears to have persisted on Sulawesi well into the Late Pleistocene.
A Dramatic Cultural Shift Around 40,000 Years Ago
By approximately 40,000 years ago, the archaeological record at Leang Bulu Bettue changes abruptly.
Earlier layers, dominated by cobble-based stone technologies and hunting of dwarf bovids (anoas) alongside now-extinct Asian straight-tusked elephants, give way to a new cultural phase.
This later phase includes a different technological toolkit and, crucially, the earliest evidence of symbolic behavior and artistic expression on Sulawesi—traits strongly associated with modern humans.
Does this sudden shift mark the arrival of Homo sapiens?
Homo sapiens Arrival and the Possible Replacement of Earlier Humans
Researchers suggest that the behavioral and technological break in the record may reflect a major demographic transition. In other words, modern humans may have entered Sulawesi and replaced an earlier hominin population.
However, replacement does not rule out interaction.
The site may hold the first direct archaeological evidence for a chronological overlap between archaic humans and Homo sapiens in Wallacea, a region already known for its complex evolutionary history.
If these groups coexisted, did they compete, avoid each other, or exchange knowledge?
Why Sulawesi Matters for Understanding Human Evolution
Sulawesi occupies a unique position in human prehistory. Unlike Australia, which was only ever inhabited by Homo sapiens, Sulawesi hosted multiple waves of hominins over more than a million years.
As Professor Brumm explains, digging deeper at Australian sites will never reveal pre-sapiens occupation. Sulawesi, however, offers a rare opportunity to excavate back to a time when two human species may have come face-to-face.
That possibility is what makes the island so scientifically compelling.
What Lies Beneath: Future Discoveries Still Await
Crucially, archaeologists have not yet reached the bottom of the cultural deposits at Leang Bulu Bettue. Several more meters of sediment may still lie below the deepest excavated layers.
Future excavations could uncover even older evidence of human activity—and potentially resolve whether Homo sapiens truly overlapped with an extinct human species on Sulawesi.
If confirmed, how might this reshape our understanding of migration, coexistence, and extinction in human history?
And are there other islands still holding secrets we have yet to uncover?
Source: Forty Thousand Years Ago on Sulawesi: Did Two Human Species Meet Face to Face—and Why Did Only One Survive?
Ölümün Tarih Öncesi Kimyası: 60.000 Yıllık Zehirli Oklar Bulundu
Ölümün Tarih Öncesi Kimyası: 60.000 Yıllık Zehirli Oklar Bulundu