
© Kaye ReedA close-up view of the mandible from an early Homo species, shown just steps from where Arizona State University graduate student Chalachew Seyoum from Ethiopia spotted it.
An ancient jawbone fragment is the oldest human fossil discovered yet, a bone potentially from a new species that reveals the
human family may have arose a half million years earlier than previously thought, researchers say.This find also sheds light on the kind of landscape where humans first originated, scientists added.
Although modern humans are the only human lineage alive today,
other human species once roamed the Earth. These extinct lineages were members of the genus
Homo just as modern humans are.
For decades, scientists have been searching Africa for signs of the earliest phases of the human family, during the shift from more
apelike Australopithecus species to more human early
Homo species. Until now, the earliest credible fossil evidence of the genus
Homo was dated to about 2.3 million or 2.4 million years ago.
Now researchers have found a human fossil in Ethiopia about 2.8 million years old. The scientists detail their findings in two papers online today (March 4) in the journal
Science.
"There is a big gap in the fossil record between about 2.5 million and 3 million years ago — there's virtually nothing relating to the ancestors of
Homo from that time period, in spite of a lot of people looking," research team co-leader and study co-author Brian Villmoare, a paleoanthropologist at the University of Nevada in Las Vegas,told Live Science. "Now we have a fossil of
Homo from this time, the earliest evidence of
Homo yet.
Comment: In spite of all the evidence people still seem to have the image of Celts as howling savages.
Archaeologists discover bronze remains of Celtic Iron Age chariot