According to an article in Scientific American , Reid Ferring, an anthropologist at the University of North Texas in Denton, and his colleagues excavating the Dmanisi site in the Caucasus Mountains of Georgia, found stone artifacts–mostly flakes that were dropped as hominins knapped rocks to create tools for butchering animals–lying in sediments almost 1.85 million years old. Until now, anthropologists have thought that H. erectus evolved between 1.78 million and 1.65 million years ago–after the Dmanisi tools would have been made.

The full story is here:-
http://www.scientificamerican.com/article.cfm?id=human-ancestors-in-eurasia-earlier

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