Slender marked medial ridge, diamond-shaped cross section, short narrow stem. Materials: Knife River Flint (56%), porcellanite (31%), silicified wood (7%). Scottsbluff thinner cross section, wider faces, more triangular Eden. Alberta similar Scottsbluff larger overall longer stems. Hunter-gatherers targeting bison other large game. Hell Gap (10,300-9,500 BP), Folsom (10,900-10,200 BP) fluted points, Clovis earliest documented points.
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