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Human changed from food collector to food producer

Many mills are basically classifyed two types, stamp mill( strike cereals grain in a mortar ) and rub down the cerial between upper and under stone.

In Japan, we call all a mortar, but it is necessary to distinguish two type, because it has different fuction. These both types excavated from the remains in the world.

Many mills is clasified basically two type of stone mills

Two types of stone mills, which fixed definite form (a crushing tool made by a stone). are known all over the world. In the old stone Age, it may be used capriciously or recreational, but the importance for his life was not great. (continue to next)

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