Dmanisi hominins
Earliest well-dated hominin fossils in Eurasia, from Dmanisi, Georgia.
Here is the rewritten encyclopedia entry about the Dmanisi hominins:
The Dmanisi hominins are a group of early human ancestors from the Early Pleistocene, known from fossils unearthed at Dmanisi, Georgia. These remains, along with stone tools, date to between 1.85 and 1.77 million years ago, making them the oldest securely dated hominin fossils found outside of Africa and the most complete early *Homo* specimens from a single location from that period. While experts disagree on their exact classification, the fossils are crucial for understanding the first hominin migrations from Africa. The collection includes over a hundred fossils, including cranial, dental, and postcranial elements, and five well-preserved skulls, labeled Dmanisi Skulls 1 through 5.
Their taxonomic status is debated because of their small brain size, primitive body structure, and the notable physical differences between the skulls. Initially, they were classified as *Homo ergaster* or *Homo erectus*, an African species, or as an early branch of Asian *Homo erectus*. In 2000, the discovery of a large jaw (D2600) led some researchers to suggest multiple hominin species were present, and in 2002 that jaw was named the type specimen for a new species, *Homo georgicus*. Later work by the Dmanisi team proposed that all the skulls belong to a single species, with differences due to age and sex, though this is not universally accepted. By 2006, the team leaned toward classifying them as a subspecies of *Homo erectus*, either *H. erectus georgicus* or *H. e. ergaster georgicus*, but the naming remains unsettled.
Anatomically, the Dmanisi hominins show a mix of features. Their legs were essentially modern in length and shape, suited for long-distance walking and running, but their arms were more similar to those of *Australopithecus* and modern apes than to later humans. They were smaller than later (non-island) *Homo*, standing 145–166 cm tall with brain sizes of 545–775 cc, comparable to *Homo habilis* rather than later *Homo erectus*. All the skulls share prominent brow ridges and large faces, though these traits vary in intensity.
During the Pleistocene, Georgia’s climate was wetter and more forested than today, similar to a Mediterranean environment. The Dmanisi site sat by an ancient lake, surrounded by forests and grasslands that supported a diverse range of Pleistocene animals.
- Field
- Paleoanthropology
- Known for
- Earliest well-dated hominin fossils in Eurasia; five well-preserved skulls (Dmanisi Skulls 1–5); evidence of early hominin migration out of Africa
- Era
- Early Pleistocene (1.85–1.77 million years ago)
- Location
- Dmanisi, Georgia
- Brain size
- 545–775 cc
- Body height
- 145–166 cm (4.8–5.4 ft)
Lore & Background
The Dmanisi hominins are known from over a hundred fossils, including cranial, dental, and postcranial elements, and five famous well-preserved skulls, designated Dmanisi Skulls 1–5. The first hominin fossil discovered at the site was a mandible (D211) uncovered on 25 September 1991 by a team led by Medea Nioradze and Antje Justus. Subsequent discoveries included Skull 1 (D2280) and Skull 2 (D2282) in 1999, a large jaw (D2600) in 2000, Skull 3 (D2700) and its jaw (D2735) in 2001, the toothless Skull 4 (D3444, with jaw D3900 found in 2003), and Skull 5 (D4500) in 2005, which matched the 2000 jaw.
Reader's Guide
The Dmanisi hominins are of paramount significance in paleoanthropology because they provide the earliest well-dated evidence of hominins outside Africa, pushing back the timeline of early human dispersal. Their fossils exhibit a mosaic of traits: modern leg morphology adapted for long-range walking and running, but arms more similar to Australopithecus and non-human apes. Their small body size (145–166 cm) and brain size (545–775 cc) are comparable to Homo habilis rather than later Homo erectus. The taxonomic debate—whether they represent Homo erectus, Homo ergaster, a distinct species Homo georgicus, or a single variable taxon—remains unresolved, highlighting the complexity of early Homo evolution. The site's Oldowan stone tools and its location near an ancient lake shore in a humid, forested climate suggest Dmanisi may have served as a refuge for early hominins, reachable from Africa via the Levantine corridor.
Did You Know?
- The Dmanisi hominins are the earliest well-dated hominin fossils in Eurasia, ranging from 1.85 to 1.77 million years old.
- Skull 4 (D3444) is the only toothless hominin discovered in such early sediments.
- The Dmanisi hominins had a brain size of 545–775 cc, comparable to Homo habilis.
- Stone tools found at the Dmanisi site are of the Oldowan tradition.
Frequently Asked Questions
Who are the Dmanisi hominins?
They are a group of early human ancestors whose fossils were recovered from a single site in Georgia. Five well-preserved skulls along with associated stone tools make them the most complete early Homo assemblage known from that time window.
Where and when were the Dmanisi hominins found?
The remains come from the town of Dmanisi in Georgia and are dated to roughly 1.85–1.77 million years ago. That makes them the oldest securely dated hominin fossils identified outside of Africa.
Why are the Dmanisi hominins important to human evolution?
They supply the clearest fossil evidence that early Homo left Africa and entered Eurasia during the Early Pleistocene. Their discovery reshaped how researchers think about the timing and route of the first major out-of-Africa migration.
What do the Dmanisi hominins look like physically?
Brain volumes across the five skulls range from about 545 to 775 cubic centimeters, showing notable individual variation. Estimated standing height falls between roughly 145 and 166 centimeters, placing them in the range of small modern adults.
Are the Dmanisi hominins a single species?
Scientists still debate their exact taxonomic placement, with some arguing for one species and others proposing multiple. Regardless of classification, all five skulls come from the same locality and time window, making them a uniquely complete sample.
More in Human Evolution 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced