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groups for the grinding stone s

A wide range of prehistoric artifacts were formed by pecking,grinding, or polishing onestonewith another. Groundstonetools are usually made of basalt, rhyolite, granite, or other macrocrystalline igneous or metamorphic rocks, whose coarse structure makes them ideal forgrindingother materials, including plants and otherstones. Native Americans used cobbles found along streams and in ...

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