Dictionary of Human Evolution and Biology

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Stone temporarily used as an instrument to modify something into an intended tool. When struck directly against another stone, a bulb of percussion will remain both on the core and on the removed flake. In advanced tool-making industries, a hammerstone is tapped against an intermediate tool such as an antler that is positioned to absorb the blow so that delicate flaking can be achieved. A hammerstone can also be used in conjunction with an anvil to crush long bones.

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