Newspaper article from our research archive:

Stone Age folk in the Rift Valley `lived in nuclear families'

Stone Age people lived in nuclear families and were using tools made from animal bone 90,000 years ago - about 50,000 years earlier than previously thought - scientists report today in the journal Science.

New dates of a Stone Age site in the Rift Valley region of eastern Zaire, where the scientists found relatively sophisticated bone tools, put the age of the settlement to between 75,000 and 90,000 years old.

The age is significant because it was around 100,000 years ago that anatomically modern humans, Homo sapiens sapiens, began to replace "archaic" humans, Homo sapiens, in Africa.

Archaeologists had previously believed that it had taken modern humans several tens of thousands of years to ...

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