An international team of archaeologists and biomolecular scientists published a blockbuster study on 21 September 2026 asserting that communities in the Peloponnese were cultivating olives and processing oil at industrial scale around 4,500 BCE — about 6,500 years ago. The paper, in the peer-reviewed journal Mediterranean Antiquity Review, reports radiocarbon dates from charred olive wood, 127 pottery sherds with lipid residues chemically consistent with olive oil, and at least 73 stone installations interpreted as presses across 213 survey sites in southern Greece.
Lead author Duuk van der Veen of the Hellenic Institute for Mediterranean Archaeology (HIMA) said the scale surprised even the project team. “We conservatively estimate contemporaneous cultivation across roughly 46,000 hectares — about 460 km² (178 sq miles) — and the residue chemistry shows processed oil, not mere fruit consumption,” he told The Plausible Post. Co-author Martin Studničková, who led the mass-spectrometry work at the Northern European Centre for Archaeological Science, added: “The isotopic signature and triacylglycerol profiles match modern olive oil far more closely than any wild-plant fats we’ve seen in comparable Neolithic assemblages.”
The team combined pollen cores taken from Lake Stymphalia and two coastal lagoons with intensive field survey in the Eurotas plain and Mani peninsula. Pollen spikes, a sudden change in phytolith assemblages and a sudden jump in heat-altered olive pits near press installations form the backbone of the authors’ case. “We also found cylindrical stone channels and smashed limestone basins we interpret as presses or collections vats,” van der Veen said. The authors estimate the landscape could have supported between 3 million and 5 million olive trees under a low- to medium-density planting model.
The paper has ignited fierce debate. Professor Jarl E. Söderberg, an archaeobotanist at the Scandinavian Institute for Prehistoric Studies not involved in the study, called parts of the claim “provocative and worth testing.” He warned in emailed remarks that residue contamination, reservoir effects in radiocarbon dating, and later re-use of stone features can mimic early dates. “Extraordinary claims require extraordinary replication,” Söderberg said. “Independent laboratories must re-run the lipid and aDNA tests before we rewrite textbooks.”
Local reaction in Messinia was immediate and impassioned. Olívia Bonilha, chair of the Kalamata Olive Growers Cooperative, said: “This is the origin story we’ve always felt — it changes everything about our identity and our product.” The Culture Ministry in Athens — which provided seed funding for the survey — said it would request an emergency €12 million (about $13 million) package to expand digs, fund conservation and fast-track museum displays around the finds. Samuel de Vries, senior adviser to the ministry’s antiquities department, said officials were already in talks with UNESCO over possible World Heritage extensions tied to early agrarian landscapes.
Outside politics, the study carries wide-reaching implications. If olive oil was being produced at scale centuries earlier than believed, it implies early long-distance trade networks, new forms of social organisation and different dietary economies across the eastern Mediterranean. “You move from subsistence gardens to exportable commodities; that changes everything about power and ritual,” said Sven Gunnarsson, an economic historian who has reviewed the preprint. The authors plan follow-up campaigns this winter: deeper lake cores, expanded ancient-DNA sampling of olive pits and blind inter-lab residue tests to answer skeptics.
Whether the claim becomes the next accepted chapter in Mediterranean prehistory or a contested outlier will depend on those replications. For now, the image of Bronze Age palaces and classical groves may be joined by a far older picture: Neolithic communities running oil presses and shipping the first liquid gold across islands and coasts. As van der Veen put it bluntly at the paper’s online press conference: “If we’re right, the Mediterranean diet has much older roots — and modern olives have an ancestor that never made it into our schoolbooks.”
