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Dating hand axes

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900,000 year old Chinese Handaxes? - Dating the earliest Acheulean Handaxes in North China

Email Human ancestors living in what is now Spain fashioned double-edged stone cutting tools as early as , years ago. Europe's Stone Age has taken an edgy turn. A new analysis finds that human ancestors living in what is now Spain fashioned double-edged stone cutting tools as early as , years ago, almost twice as long ago as previous estimates for this technological achievement in Europe. If confirmed, the new dates support the idea that the manufacture and use of teardrop-shaped stone implements, known as hand axes, spread rapidly from Africa into Europe and Asia beginning roughly 1 million years ago, say geologist Gary Scott and paleontologist Luis Gibert, both of the Berkeley Geochronology Center in California. Evidence of ancient reversals of Earth's magnetic field in soil at two archaeological sites indicates that hand axes date to , years ago in one location and to , years ago in the other, Scott and Gibert report in the Sept. Until now, most researchers thought that hand axes unearthed at these sites were made between , and , years ago.

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Humans Shaped Stone Axes 1. The study, published this week in Nature, raises new questions about where these tall and slender early humans originated and how they developed sophisticated tool-making technology. Early humans were using stone hand axes as far back as 1. Homo erectus appeared about 2 million years ago, and ranged across Asia and Africa before hitting a possible evolutionary dead-end, about 70, years ago. Some researchers think Homo erectus evolved in East Africa, where many of the oldest fossils have been found, but the discovery in the s of equally old Homo erectus fossils in the country of Georgia has led others to suggest an Asian origin. The study in Nature does not resolve the debate but adds new complexity.

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He had found them in prehistoric lake deposits along with the bones of extinct animals and concluded that they were made by people "who had not the use of metals" and that they belonged to a "very ancient period indeed, even beyond the present world". Following visits to both Abbeville and Saint Acheul by the geologist Joseph Prestwich , the age of the tools was finally accepted. The industry was renamed as the Acheulean in From the Konso Formation of Ethiopia, Acheulean hand-axes are dated to about 1. Not all researchers use this formal name, and instead prefer to call these users early Homo erectus. However more recent research demonstrated that hand-axes from Spain were made more than , years ago.

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Humans Shaped Stone Axes 1.8 Million Years Ago, Study Says

Four classes of hand axe are: Large, thick hand axes reduced from cores or thick flakes, referred to as blanks 2: While form remains rough and uncertain, an effort has been made to reduce the thickness of the flake or core 3: Either a preform or crude formalized tool, such as an adze 4: Finer formalized tool types such as projectile points and fine bifaces While Class 4 hand axes are referred to as "formalized tools", bifaces from any stage of a lithic reduction sequence may be used as tools.

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