The Dmanisi Paleolithic site is an Early Pleistocene archaeological and paleontological locality beneath the ruins of the medieval town of Dmanisi in southern Georgia. Deposits on the Dmanisi promontory preserve evidence of repeated Lower Paleolithic occupations, including Mode 1 stone artifacts, animal and plant remains, and nearly 80 hominin fossils. The earliest securely documented occupations date to approximately 1.8 million years ago, while the hominin-bearing deposits formed around 1.77 million years ago.
The site is best known for the Dmanisi hominins, among the earliest securely dated skeletal remains of the genus Homo outside Africa. Its dated geological sequence allows the hominins and their stone technology to be studied alongside evidence for contemporary fauna, vegetation, climate and the processes that formed the fossil assemblages.
Discovery and research
Archaeological investigation at Dmanisi initially concentrated on the medieval settlement, where excavations had been conducted since the 1930s. In 1983, paleontologist Abesalom Vekua identified a fossil rhinoceros tooth among animal remains exposed during this work. Stone artifacts were recognized the following year, establishing that Early Pleistocene archaeological deposits survived below the medieval buildings. The first hominin fossil, a mandible, was discovered in 1991. The first Dmanisi cranial remains were formally reported in 2000.
Subsequent excavations recovered five hominin skulls, several mandibles and bones from other parts of the skeleton, as well as large collections of artifacts and animal fossils. Further research expanded beyond the principal fossil-bearing blocks. Test excavations and exposed cross-sections across the promontory demonstrated that deposits containing artifacts and fauna extend over at least , with preserved sequences as much as thick.
Georgia submitted the property as the "Dmanisi Hominid Archaeological Site" to the UNESCO World Heritage Tentative List on 24 October 2007 under cultural criteria (iii) and (v).
Location and geological setting Dmanisi lies at an average elevation of about on a promontory above the confluence of the Mashavera and Pinezauri rivers. The river valleys connect the volcanic uplands to the west and south with the Caspian lowlands to the east. During the Early Pleistocene, lava flowed down the Mashavera valley, covered the rocky ridge at the confluence and extended a short distance into the Pinezauri valley, damming the stream.
The cooled lava formed a basalt platform on which the archaeological deposits accumulated. Volcanic ash, wind-blown sediment, and material carried downslope subsequently covered the platform. As the two rivers cut more deeply into their valleys, the deposits were left on the elevated promontory later occupied by the medieval town. Most stone-working material was collected as rounded river cobbles or as angular blocks from nearby rock exposures.
Stratigraphy and site formation
Sequence and chronology
The sediments above the basalt are known as the Dmanisi Formation and are divided into Strata A and B. Their chronology is based on radiometric dating of volcanic rocks, the recorded reversals of Earth's magnetic field and the known time ranges of fossil animals. Regional volcanic dates provide an outer bracket of approximately 1.85–1.76 million years for the formation.
Stratum A, subdivided into A1–A4, consists mainly of successive volcanic-ash deposits separated by brief periods of soil formation. Magnetic minerals in these deposits point in the same direction as the present magnetic field, known as normal polarity, placing them within the closing part of the Olduvai subchron. Artifacts at several levels document repeated occupation. Direct dating of the uppermost basalt beneath Stratum A at M5 places these occupations between approximately 1.80 and 1.78 million years ago, refining the wider estimate of 1.85–1.78 million years proposed in earlier research.
A period of erosion separates Stratum A from Stratum B. Magnetic minerals in Stratum B point in the opposite direction, known as reversed polarity, showing that it accumulated after the end of the Olduvai subchron, during the early Upper Matuyama chron. Its lowest division, B1, comprises both sediment deposited on the slope and material filling underground erosion channels, collapse hollows and gullies. These fills yielded most of the vertebrate fossils and all hominin remains recovered from the principal excavation blocks. The main B1 fossil deposits formed around 1.77 million years ago. Strata B2–B5 consist mainly of deposits moving gradually down the slope, and B2 contains particularly dense concentrations of artifacts in several areas.
Formation and preservation
Dmanisi records a succession of occupations rather than a single living surface. Ash-covered surfaces in Stratum A and relatively undisturbed slope deposits in Strata B1 and B2 have the greatest potential to preserve artifacts and bones close to their original positions, although erosion and animal burrowing disturbed some areas.
A different context is represented by the underground channels and gullies of B1. Water moving through the earlier deposits opened underground passages; their collapse and subsequent surface erosion created hollows and gullies. Some bones, artifacts and sediment entered these features from surrounding surfaces, while other remains may have been deposited directly within them. Ferring and colleagues estimated that the principal channels and gullies formed and filled within decades. The slight weathering of the B1 bones indicates that they generally remained exposed for only a short time before burial. Although these fills are unlikely to preserve intact living surfaces, rapid burial and their subsequent sealing beneath Stratum B2 produced large, well-preserved fossil assemblages.
The principal bone concentrations were not deposited by rivers. Bones of different sizes occur together rather than having been sorted by flowing water, and rounding, polishing and other evidence of prolonged transport are rare or absent.
Hominins
Nearly 80 hominin fossils have been reported from Dmanisi, representing at least five individuals. The collection includes five skulls, mandibles, isolated teeth, and bones from the rest of the skeleton. All derive from B1 channel-and-gully fills in the principal excavation area, rather than from the older artifact-bearing levels of Stratum A.
The postcranial remains include elements of the spine, shoulder, arms and legs. Their anatomy indicates upright walking but combines human-like lower limbs with features of the upper body that differ from later Homo. Preserved remains also indicate substantial differences in body size among the individuals.
The fossils combine small cranial capacities and other primitive traits with characteristics associated with early Homo erectus. Vekua and colleagues provisionally assigned them to H. erectus while noting affinities with H. habilis. Lordkipanidze and colleagues later argued that variation among the five skulls could occur within one population and supported their inclusion in a variable H. erectus lineage rather than division into several species.
A 2025 analysis of postcanine tooth-crown area reached a different conclusion. Among the three individuals studied, D4500-D2600 showed closer affinities to australopiths; D2282-D211 and D2700-D2735 aligned more closely with early Homo. Nery and colleagues interpreted this as support for two contemporaneous taxa, H. georgicus and H. caucasi. They acknowledged that tooth-size ratios alone could not exclude one species if its sexual dimorphism resembled that of living great apes, but considered the contrasting dental proportions better explained by two taxa.
Stone technology
The lithic industry represents Mode 1 technology and is comparable to the African Oldowan. It consists principally of flakes, cores and core-choppers. Retouched pieces are rare, and bifacial tools such as hand axes are absent. An analysis of material collected during excavations from 1991 to 2006 included more than 8,000 objects. Untouched or naturally fractured cobbles and blocks constituted 44.6% of the collection, while flakes and cores–choppers demonstrate that stone was worked at the site.
Basalt, fine-grained volcanic tuff and andesite were the principal raw materials. Rounded cobbles were collected from deposits associated with the Mashavera and Pinezauri rivers, while angular blocks of tuff came from nearby Late Cretaceous exposures. Estimated collection distances ranged from several hundred meters to several kilometers. Flakes were most commonly removed from one face in a single direction; opposed-direction and centripetal reduction patterns were comparatively rare. Knapping surfaces received little preparation, and stone quality influenced how extensively cores were worked.
The older Stratum A assemblages occur at several distinct levels and are dominated by flakes; cores and core-choppers are also present. Differences in raw-material selection and reduction intensity between Strata A and B demonstrate variation among the repeated occupations, while the technology remained within a Mode 1 framework.
Paleoenvironment Microscopic silica bodies formed in plants (phytoliths), together with pollen and larger plant remains such as fossil fruits, indicate that the local environment changed while the deposits accumulated. Lower deposits dating to the Olduvai subchron record a mixture of grassland and woodland under relatively warm and humid conditions. Pollen from the equivalent lower sequence at nearby Orozmani represents oak–hornbeam woodland, riverside forest, and higher forests containing chestnut and beech. Because pollen was generally poorly preserved at Dmanisi, the reconstruction draws principally on phytoliths and fossil fruits.
Near the end of the Olduvai subchron, the combined plant evidence indicates a marked reduction in rainfall and the expansion of open vegetation. During the documented hominin occupation, grasses and plants adapted to dry conditions dominated locally, while woodland remained on nearby higher ground. Messager and colleagues reconstructed a warm, relatively dry steppe-forest. Although its open structure has been compared with African savanna environments, the identified plants were predominantly temperate species.
Amphibians and reptiles independently indicate a warm, seasonally dry climate resembling that of the modern Mediterranean. Estimates based on the climatic ranges of related living species produced a mean annual temperature of ± 2.4 °C and mean annual precipitation of approximately ± 191 mm. Summers were hotter and drier than at modern Dmanisi. The assemblage indicates environments ranging from steppe or semi-desert to open woodland, with rocky ground, shrubs, and permanent aquatic habitats.
Small mammals from Stratum B1 support this reconstruction of a varied but predominantly open landscape. When the species were grouped according to their preferred habitats, dry open meadow, waterside and rocky settings accounted for the largest proportions. Open habitats requiring more moisture were less prominent; woodland accounted for only a small proportion. The researchers reconstructed open steppe around Dmanisi, accompanied by rocky ground, wet areas, and limited woodland; the wider river valleys probably contained open water, wet ground, and gallery forest.
Fauna