A beautifully shaped grinding stone from S. California, used prehistorically to grind grain and nuts. Rare remnants of asphaltum around edges which would have been used as a sort of adhesive to hold a net, attached to the bowl to prevent the finely ground flower to escape.
Ex. Jerry Gaither, Tamarack Trading, Palos Verdes, CA
8 in / 20.25 cm
8 lbs 14 oz / 4 kg