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Millingstone Horizon is an archaeological period of Native American dominance denoting a period in California, USA 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.
The Chumash people, who inhabited much of present day San Luis Obispo County, Santa Barbara County, and Ventura County have Millingstone Horizon elements in their history. For example an extensive site at Morro Creek in the present day town of Morro Bay has yielded evidence of coastal Chumash in the Millingstone period.
- Terry L. Jones and Kathryn Klar (2007) California Prehistory: Colonization, Culture, and Complexity, Published by Rowman Altamira ISBN 0-7591-0872-2, 408 pages
- C.Michael Hogan (2008) Morro Creek, ed. by A. Burnham 
- T.L. Jones, 2007
- C.M. Hogan, 2008
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