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LARGE NOTCHED may have been caused by ground pressure or a combination of a flaw in the stone & ground pressure or freezing and thawing. This notched biface is very similar to the slightly larger one it was found with and was most probably made by the same craftsman. They were both made of Burlington chert from the area around Avon in Illinois or Keokuk in Iowa. This one measures approximately 11 inches (27.9 cm) long and
4 inches ( 10.2 cm) wide
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