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Two tools, one made of elk antler and the other made from a bison metatarsal, were recovered in an in situ Folsom component and are believed to have been used in removal of Channel flakes from Folsom projectile points. This offers the first known archeological evidence that can be used to argue that the process made use of controlled pressure through a simple leverage device.
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Frison et al. (1981) studied this question.
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