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The Acheulean biface shown in the figure below, dating to approximately 350,000 B.P., is from a site at Atapuerca, a small town in the province of Burgos in northern Spain. Bifaces are two-sided stone tools produced by chipping away flakes ("lithic reduction"). So they are have flake scars on both sides. These hand axes were used for a variety of purposes. They are usually convex in shape. This particular ax is shaped from quartzite.
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Below is another Acheulean hand ax, from the site for which the Acheulean is named, Saint-Acheul, a hamlet in northwestern France. Dating to about 400,000 B.P., this tool was chipped out of flint.
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