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Archaeologists apply the term "projectile point" to a wide range of tools. Although they used to think projectile points were used only for spears, they now realize hat the heavier, ill-shaped points were used as knives. Ahler 1971).
Projectile points can be made from just about anything that can be sharpened, including stone, glass, wood, bone, and metal. Flaked stone points are most common in Nebraska, although metal points and occasionally bone points have been found.