Gona, Ethiopia

The Gona Paleoanthropological Research Project, located in Ethiopia’s Afar region, is co-directed by Dr. Sileshi Semaw (Centro Nacional de Investigación sobre la Evolución Humana, Spain) and Dr. Michael Rogers (Southern Connecticut State University). The site has revealed hominin fossils over 6.3 million years old, as well as stone tools that trace 2.6 million years of human technological development.

Figure 1. 1.5-Million-Year-Old Human Face Reveals New Insights into Evolution.

The updated reconstruction combines a fossilized braincase (first described in 2020) with several facial fragments from a single individual, DAN5, who lived between 1.6 and 1.5 million years ago. Using digital techniques, researchers reassembled the facial pieces and teeth to create the most complete human skull from this period ever recovered in the Horn of Africa. Figure 1 shows 1.5-Million-Year-Old Human Face Reveals New Insights into Evolution.

DAN5 has been identified as Homo erectus, a long-lived species that spread across Africa, Asia, and Europe around 1.8 million years ago.

Reconstructing the DAN5 Fossil:

Scientists used high-resolution micro-CT scans of the four major facial fragments, discovered during 2000 fieldwork at Gona. From these scans, 3D models were created and digitally reassembled on a computer, with teeth positioned in the upper jaw where possible. The final step was connecting the reconstructed face to the braincase, producing a mostly complete cranium. The process took about a year and involved several iterative adjustments before the final version was achieved.

What Scientists Concluded

The study reveals that the Gona population from 1.5 million years ago had a mix of traits: a braincase typical of Homo erectus, but facial and dental features more ancestral, usually seen in earlier species. For example, DAN5 had a relatively flat nasal bridge and large molars. Researchers reached this conclusion by comparing DAN5’s face and teeth with fossils of the same age, as well as older and younger specimens.

While a similar combination of traits had been observed in Eurasian fossils, DAN5 is the first African fossil to show this mix, challenging the notion that Homo erectus evolved outside Africa. Dr. Yousuke Kaifu (University of Tokyo) recalls being shocked when he first saw the reconstructed face and jaw.

Dr. Baab notes, “The oldest Homo erectus fossils are from Africa, and DAN5 shows that transitional forms existed there too, supporting Africa as the species’ origin. However, because DAN5 postdates the initial migration out of Africa, other interpretations remain possible.”

Remarkably, DAN5 was associated with both Oldowan stone tools and early Acheulian handaxes, some of the earliest evidence linking these tool traditions directly to a hominin fossil, according to Dr. Semaw.

Future Research

The team aims to compare DAN5 with early European fossils, including Homo erectus and Homo antecessor (~1 million years old), to better understand facial variation, adaptation, and evolution. Dr. Freidline (University of Central Florida) notes that such comparisons could also test alternative evolutionary scenarios, like genetic admixture between species—similar to later interactions among Neanderthals, Denisovans, and modern humans.

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025), Ancient 1.5-Million-Year-Old Human Face Challenges Our Understanding of Evolution, AnaTechMaz, pp.1240