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Helton Phase.

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  • Additional Information
    • Subject Terms:
      Illinois River Valley (Ill.); United States
    • Abstract:
      The latter part of the Middle Archaic period saw the rise of the Helton phase in the lower Illinois Valley. The artifacts discovered at the Koster site in west-central Illinois were remarkable because of the evidence of ground and pecked chert implements such as woodworking adzes, stemmed points, grooved axes, and improved weights for atlatls. Technological innovations possibly resulted from shrinking territory, climatic changes, or other unknown factors.