New findings reveal the geological age, context, and anatomy of hominin fossils discovered at the Ledi-Geraru Research Project in Ethiopia. Although scientists have uncovered much of the story of human evolution, several key chapters are still missing.
One major gap lies between 2 and 3 million years ago, a period for which fossil evidence remains scarce. This absence is especially significant because it marks the era when the branch of the hominin family tree that includes modern humans, or Homo sapiens, first appears in the fossil record.
Today, Homo sapiens (commonly referred to by anthropologists as Homo) is the only surviving member of the hominin lineage. In earlier times, however, our ancestors shared the Earth with other related species, sometimes competing and coexisting with them. Recent research supported by the National Science Foundation and the Leakey Foundation, and published in Nature, helps close one of these evolutionary gaps by revealing two early hominin species that lived side by side.
At the Ledi-Geraru site in Ethiopia’s Afar Region, an international research team discovered hominin fossils dated between 2.6 and 3.0 million years old. Lucas Delezene, an associate professor of anthropology at the University of Arkansas, served as the study’s second author, contributing alongside more than 20 scientists from North America, Africa, and Europe...
An international team of researchers working at Ledi-Geraru in Ethiopia has uncovered fossils indicating that early Homo and a newly identified Australopithecus species coexisted between 2.6 and 2.8 million years ago.
The discovery includes 13 Australopithecus teeth, distinct from the famous Australopithecus afarensis (“Lucy”), and confirms there is no evidence of Lucy’s kind after 2.95 million years ago.
Dating was made possible by analyzing volcanic ash layers containing feldspar crystals, bracketing the fossils in time. This finding reveals a more complex, “bushy tree” pattern of human evolution, where different hominin species overlapped in both time and place.
Two Hominin Species Together: Oldest known Homo fossils and a new Australopithecus species found at the same site.
Precise Dating from Volcanic Ash: Feldspar crystals in volcanic layers bracketed the fossils at 2.6–2.8 million years old. Complex Evolutionary Picture that Supports a “bushy tree” model of human evolution with overlapping species.
Arizona State University A team of international scientists has discovered new fossils at a field site in Africa that indicate Australopithecus, and the oldest specimens of Homo, coexisted at the same place in Africa at the same time — between 2.6 and 2.8 million years ago.
The paleoanthropologists discovered a new species of Australopithecus that has never been found anywhere. The Ledi-Geraru Research Project is led by scientists at Arizona State University and the site has revealed the oldest member of the genus Homo and the earliest Oldowan stone tools on the planet....