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Millingstone Horizon is an archaeological period of Native American dominance denoting a period in California, United States involving extensive use of manos and other grinding technology. The interval is a subset of the Archaic Period; specifically Millingstone is usually applied to the period 6500 to 1500 BC. Alternatively this epoch within North America is known as the Encinitas Tradition. Archaeological recovery from a number of sites in California has yielded evidence of Native American habitation and daily life in this period that ended around 3,500 years ago.
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