Dictionary of Human Evolution and Biology

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Bolas Stones

Round quartzite balls recovered at Olorgesailie and other East African prehistoric sites dating from 1.8 mya to 40 kya; a fanciful early interpretation that the balls were a primary hunting tool (bolas) has been revised by later archaeologists who showed that, when used as a hammerstone, repeated strikes turn such a rock into a round ball or spheroid.

See by-product hypothesis.

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