The Twilight Cave workshop
In Kenya's central Rift Valley, on the Mau Escarpment, is a rock shelter called Enkapune Ya Muto, or "Twilight Cave". The site sits at an elevation of 2,400 meters and contains a dense archaeological record stretching from the Middle Stone Age to the Iron Age. During excavations in 1982 and 1987, archaeologist Stanley Ambrose uncovered layers of stone tools, animal bones, and something more exceptional: the components of an ancient jewelry workshop.
Within a layer radiocarbon dated to approximately 40,000 years ago, Ambrose and his team found 13 complete ostrich eggshell beads, 12 unfinished bead preforms, and 593 fragments of shell. This collection represents one of the earliest examples of personal ornamentation ever discovered. The manufacturing process was meticulous. First, ostrich eggshells were broken into smaller pieces. These fragments, or blanks, were then drilled with a sharp stone point. Finally, the perforated blanks were likely strung together and ground against an abrasive stone to make them smooth and circular in size.