A String of Ancient Snails
In a small cave, 300 kilometers east of Cape Town, archaeologists found a collection of shells that changed our understanding of when human culture began. More than 70 beads made from the shell of a small sea snail, Nassarius kraussianus, were uncovered in the Middle Stone Age layers of Blombos Cave. These layers are dated to approximately 75,000 years ago using methods like optically stimulated luminescence and thermoluminescence. This discovery places personal ornamentation 30,000 years earlier than previously accepted examples from Europe.
The shells were not in the cave by accident. The Nassarius kraussianus snail lives in estuaries, and the nearest river mouths are 20 kilometers away from the cave. This indicates that the inhabitants of Blombos deliberately collected these shells. All the shells are of a similar size and have a single, small perforation near the lip. Microscopic analysis of these holes reveals they were likely made by a sharp bone point. The shells show distinct wear patterns around the perforations and on their surfaces, consistent with the friction created by being strung on a cord and rubbing against skin or clothing. Many were found in clusters, suggesting they were once part of a single necklace or bracelet. Traces of red ochre on the beads hint that they were worn against ochre-painted skin or were themselves colored with the pigment.