This picture shows a reverse hinge fracture which is one of the "classic" break patterns that happens during basal thinning. This picture shows both sides of a broken Clovis preform found on the Ledford site in Kentucky. The wide basal thinning flake curved inward causing this biface to snap into. Broken artifacts like these are accurate cultural indicators. The manufacturing process they exhibit is very specific and can sometimes be the most important evidence found on a site.
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