Groundstone Axes & Celts; Basalt rock; Boone County, MO; Prehistoric. Groundstone tools are produced all over by rubbing hard rocks together and changed very little over time and cultures. University of Missouri Kelso Collection.

Groundstone Axes & Celts; Basalt rock; Boone County, MO; Prehistoric. Groundstone tools are produced all over by rubbing hard rocks together and changed very little over time and cultures. University of Missouri Kelso Collection.

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