Boats rot, so prehistoric seafaring leaves almost no direct trace. A 2025 study therefore looked at something that survives: stone tools. Their wear and residues suggest that people in island Southeast Asia were working plant fibre for cord and nets as early as about 40,000 years ago. For Optional Paper I, it is a good lesson in how archaeologists reason from indirect evidence.
Source: Fuentes and Pawlik, “Testing the waters: Plant working and seafaring in Pleistocene Wallacea”, Journal of Archaeological Science: Reports 62 (April 2025), DOI 10.1016/j.jasrep.2025.105020. Checked through the abstract record and press coverage.
Why direct evidence is rare
Early boats were probably made of wood and plant fibre. Such materials seldom survive, and direct boat remains are almost nonexistent. Researchers must therefore infer seafaring from other clues, such as the tools used to make and repair watercraft and the food that came from the sea.
What the tools show
The authors examined stone tools from sites in the Philippines, Indonesia and Timor-Leste, some dated to about 40,000 years ago. Microscopic traces show that people processed plants, probably to extract fibre. Fibre of this kind makes rope, nets and bindings, which fit boat building and fishing. Sites in Mindoro and Timor-Leste also yielded bones of deep-water fish such as tuna and sharks, along with hooks, gorges and net weights.
The authors read these finds together. Cordage, fishing gear and open-water fish suggest planning, and knowledge of fish seasons and routes. This points to people who were more than coastal foragers. However, it is a chain of inference.
What it cannot tell us
The evidence does not reveal what the vessels looked like. They may have been simple bamboo rafts or something more complex. It also cannot reconstruct a single voyage. Headlines that say the tools “contradict the timeline of civilisation” or show Southeast Asians “ahead of Europe” go beyond the abstract. The firmer claim is narrower: Palaeolithic technology was not centred only on Africa and Europe.
Using it in UPSC Mains
Use the study when a question asks about Palaeolithic technology, behavioural modernity or the peopling of islands. Make the method visible in your answer. State what the evidence is (tool residues, fish remains, fishing gear), what it implies (fibre technology and deep-water fishing), and what is still uncertain (boat design, route, purpose). That structure earns more credit than a list of discoveries.
For practice, use the Prehistoric Archaeology PYQs and choose a question on Palaeolithic culture and tool technology. For an earlier case where ecology shaped tool design, read the Lower Palaeolithic tools at Jaljulia and Qesem Cave. The syllabus map is in the Anthropology Optional complete guide.
Sources
Fuentes and Pawlik (2025), Journal of Archaeological Science: Reports 62, article 105020; Popular Archaeology coverage of the same study. Note that some news reports shorten the journal name to “Journal of Archaeological Science”.