In the 1930s, paleoanthropologists Louis and Mary Leakey unearthed early stone artifacts at Olduvai Gorge in Tanzania and named them the Oldowan tool culture. (sciencedaily.com)
AMERICAN MADE A 18,500 - to 17,000 - year - old stone artifact unearthed at Chile's Monte Verde site, shown from the side (left) and top (right), contains smooth areas where pieces of the rock were struck off to create a scraping or cutting tool. (sciencenews.org)
In a second paper, Max Planck geoscientist Daniel Richter and colleagues date 14 stone artifacts found in and just above sediment that held the new fossil discoveries, allowing the researchers to narrow down the fossils» age to approximately 300,000 years ago. (sciencenews.org)