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Bitterroot 7,500-6,500 B.P.
The Bitterroot is triangular with a lenticular cross- section and has straight edges. The Bitterroot displays a uniform flaking pattern. Flakes tend to hinge at the midline on both faces creating a fairly well-defined ridge. The flaking technique is similar on all varieties of the Bitterroot points. Bases can be straight, concave, or convex. Side-notches are usually deep and narrow but can also be shallow. Length range: 1.4 to 8.8 cm, width range: 1.4 to 3.5 cm, thickness range: .3 to .9 cm. Swanson Jr.