Ornament, Weapon, or Tool? Microwear Analysis of Shark Teeth from the Rio Do Meio Site in Florianópolis, Brazil

Shark remains are common in coastal archaeological sites in southern Brazil. Here we present an analysis of microwear visible on shark teeth found at the Rio do Meio site in Florianópolis, Brazil. It demonstrates that hafted shark teeth were used to work soft materials such as leather, as well as semihard materials such as wood and bone, whereas others probably functioned as arrowheads. The results also show a possible preference for tiger shark teeth use for woodworking. The identified technical motions include piercing, cutting, and scraping, as well as scaling and sawing. These findings allow us to question the common interpretation of shark teeth use as ornaments and as having symbolic value. Instead, shark teeth seem to have been used as tools and weapons in daily life.