03/06/2015

Fossil Jaw Turns Back Clock on Human Evolution

12:08 minutes

Close up view of the mandible that Chalachew Seyoum, an ASU graduate student from Ethiopia, discovered. Photo by Kaye Reed
Close up view of the mandible that Chalachew Seyoum, an ASU graduate student from Ethiopia, discovered. Photo by Kaye Reed

The fossil record linking Australopithecus specimens like Lucy to Homo, the genus to which humans belong, is spotty. But a newly discovered fossil jaw provides a glimpse at that little-known time period between two and three million years ago, and pushes the date of Homo‘s appearance to 2.8 million years ago—400,000 years earlier than previous estimates. Brian Villmoare and colleagues describe the fossil in Science Express.

Segment Guests

Brian Villmoare

Brian Villmoare is an assistant professor at the Department of Anthropology at University of Nevada, Las Vegas in Las Vegas, Nevada.

Fred Spoor

Fred Spoor is a paleontologist at University College London in London, England.

Chalachew Seyoum

Chalachew Seyoum is a graduate student at Arizona State University in Tempe, Arizona.

Meet the Producer

About Christopher Intagliata

Christopher Intagliata was Science Friday’s senior producer. He once served as a prop in an optical illusion and speaks passable Ira Flatowese.