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A sample of 11 sherds from the Late Woodland component of the Sperry Site in Jackson County, Missouri was selected for petrographic analysis. The findings indicate that sherds as well as granite particles, and possibly limestone and sand served as tempering agents. It is suggested that prehistoric potters may have been utilizing till clays (available locally) which contain naturally occurring granitic particles and further tempering the clay with sherds, limestone, or sand.
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Nancy O’Malley (1981) studied this question.
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