A series of "Clear Fork" tools from the Rio Grande Plain of southern Texas have been subjected to a functional analysis. Macroscopic, microscopic, and edge angle studies were conducted. A high frequency of nibbling wear was recorded on steeply-angled working edges. Comparisons of these data with several published studies indicate that this tool form was used in the working of wood or other tough materials.
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Hester et al. (1973) studied this question.
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