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The stone tools in this tradition, first appearing about 1.5 million years BP and generally abandoned about 200,000 years ago, are bifacial wherein their creators, controlling the shape of the whole core tool, worked stone on both sides to produce a fine cutting edge. Their name is taken from Saint-Acheul, where they were first found, located in the Somme valley in the north of France. Acheulean tools differ from the Oldowan tools of Homo habilis in that as bifaces they are flatter, sharper, and bearing a more evenly formed cutting edge. Acheulean tools included hand axes, one of the most common, scrappers, choppers, and burins, but "the most common tools, however, remain the amorphous and ubiquitous utilized flakes" (Wolpoff 1999:444).
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