JERUSALEM, October 27, 2026 — New research shows the ‘Ubeidiya archaeological site in the Jordan Valley is at least 1.9 million years old, placing early humans in the region hundreds of thousands of years earlier than previous estimates. The revised timeline makes ‘Ubeidiya, alongside the Dmanisi site in Georgia, one of the oldest known human settlements outside Africa.
The Dating Problem at ‘Ubeidiya
For decades, the ‘Ubeidiya Formation has drawn scientific attention because of its early evidence of the Acheulean stone tool tradition. This technology is known for large tools shaped on both sides, including hand axes. The site also contains a rich collection of animal fossils representing species originally associated with Africa and Asia, several of which are now extinct. Despite its importance, researchers have struggled to establish exactly when early humans occupied the area.
Previous estimates generally placed ‘Ubeidiya between 1.2 million and 1.6 million years old. According to the research team, those dates relied on comparisons with other archaeological and geological evidence rather than direct measurements. The uncertainty left a gap in the story of how and when human populations first moved beyond their African homeland.
The new study was led by Prof. Ari Matmon of the Hebrew University of Jerusalem, Prof. Omry Barzilai of the University of Haifa, and Prof. Miriam Belmaker of the University of Tulsa. By combining three advanced dating methods, the team established a more reliable timeline. Their findings indicate the site is at least 1.9 million years old, making it one of the earliest known locations where ancient humans lived outside Africa.
How the New Methods Work
To resolve the uncertainty, the researchers collected new samples from the site and analyzed them using three complementary dating techniques. Each provided an independent source of evidence about the age of the ancient deposits. The first technique, called cosmogenic isotope burial dating, uses rare isotopes that form when cosmic rays interact with rocks exposed at Earth’s surface.
After the rocks become buried, these isotopes decay at known rates. Measuring what remains allows scientists to estimate how long the rocks have been underground. This method gave the team a direct measurement of the burial age, independent of the relative comparisons used in earlier studies.
The researchers also investigated evidence of Earth’s ancient magnetic field recorded in sediments deposited at the bottom of a lake. As tiny magnetic minerals settle through water, they align with the planet’s magnetic field at that moment. When the field flips — as it has done many times in Earth’s history — the alignment recorded in the sediment layers flips with it. Matching these patterns to the known global timeline of magnetic reversals provides another age constraint.
A third technique examined the radioactive decay of uranium and thorium in carbonate formations. Together, the three methods converged on the same minimum age. The convergence of independent lines of evidence gives the new date its weight.
What the Tools and Fossils Tell Us
The ‘Ubeidiya Formation contains evidence of the Acheulean stone tool tradition, characterized by large, double-sided hand axes. This toolkit represents a significant technological step beyond the simpler Oldowan tools found at earlier African sites. The presence of Acheulean tools at 1.9 million years ago suggests the populations reaching the Levant carried this technology with them, or developed it very soon after arrival.
The site also features a collection of animal fossils from species associated with Africa and Asia, including some now extinct. This mix of fauna reflects the Jordan Valley’s position as a biological crossroads. The environment would have offered fresh water, diverse habitats, and a corridor for movement between continents — conditions that attracted both humans and the animals they hunted or scavenged.
The Homo genus is evidenced by the appearance of H. habilis over 2 million years ago. Anatomically modern humans emerged in Africa approximately 300,000 years ago. The ‘Ubeidiya occupants lived in the long interval between these milestones, likely representing an early form of Homo erectus or a closely related population.
Rewriting the Migration Map
The revised dating makes ‘Ubeidiya roughly as old as the famous Dmanisi site in Georgia. Dmanisi has yielded fossils and simple stone tools dated to about 1.8 million years ago. Together, the two sites now anchor the earliest known human presence outside Africa at the western and eastern ends of a potential dispersal corridor.
Intriguingly, the toolkits differ. Dmanisi preserves Oldowan-like technology — simple flakes and choppers. ‘Ubeidiya shows the more advanced Acheulean tradition. This contrast raises questions about whether different populations with different technologies entered Eurasia at roughly the same time, or whether the Acheulean appeared later and spread rapidly. The new date pushes the Acheulean’s appearance outside Africa much closer to its African origins.
The findings suggest that ancient human populations, using different types of stone tools, had already spread into the Levant during a crucial early period of human expansion beyond Africa. The Jordan Valley and the Caucasus region may have represented separate entry points, or nodes along a broader frontier of movement.
What This Means for the Human Timeline
The 1.9-million-year-old date for ‘Ubeidiya compresses the timeline between the earliest Homo fossils in Africa — over 2 million years ago — and the first solid evidence of humans in Eurasia. It leaves less time for the anatomical and behavioral changes that equipped populations for long-distance dispersal.
Researchers now have two firmly dated anchor points at opposite ends of the same general latitude. The next steps will involve searching for sites in the vast territory between them — across the Levant, Anatolia, and the Iranian plateau — to trace the routes and rhythms of that first expansion. The science behind the new dating methods, particularly cosmogenic isotope burial dating, can now be applied to other candidate sites where volcanic or sedimentary sequences preserve similar conditions.
What researchers found at ‘Ubeidiya does not just shift a date. It reshapes the framework within which we ask about the pace, the drivers, and the capabilities of the first human journeys beyond Africa. The Jordan Valley, long known as a crossroads of history, now stands confirmed as a crossroads of deep prehistory as well.
Sources
- Human evolution
- 1.9-million-year-old discovery rewrites the story of human evolution
- BHU-Aus univ pact for evolution research | Varanasi News – The Times of India
Photo: עומרי ברזילי – Omry Barzilai (CC BY-SA 4.0)
