Dictionary of Human Evolution and Biology

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Stone

1. polished concretion of hardened sediment, one of the raw materials exploited by Paleolithic peoples, of which rocks consist.

2. a nonmetric unit of weight (body mass).

3. rarely, in various (but not all) geological classification systems, a particle of sediment about 60 40 mm in diameter, larger than a pebble but smaller than a cobble.

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