An Ancient Ochre Workshop
On the southern coast of South Africa, a limestone cliff cave 34.5 meters above sea level holds some of the earliest evidence of human symbolic thought. Blombos Cave, located about 300 km east of Cape Town, contains Middle Stone Age deposits dating back 100,000 years. Excavations have revealed a series of occupation layers. The M1 phase, dated to approximately 71,000 BCE, yielded two small, flat pieces of ochre that changed our understanding of early human cognition.
Ochre is an iron-rich mineral, a soft stone that can be ground to produce a red or yellow pigment. More than 8,000 pieces of ochre have been found in the cave's Middle Stone Age layers. The two most significant pieces, designated SAM-AA 8937 and SAM-AA 8938, show deliberately engraved geometric patterns. One piece has a cross-hatched design framed by parallel lines. The markings appear to be intentionally and systematically applied, suggesting they are not random doodles and are symbolic representations. These abstract designs are at least 77,000 years old, preceding comparable European cave art by tens of thousands of years.
A Cognitively Modern Toolkit
The engraved ochre pieces were not found in isolation. The same archaeological layers at Blombos Cave contained a sophisticated toolkit showing advanced cognitive abilities. Discoveries include finely made bifacial stone points, known as Still Bay points, likely used as spearheads. Archaeologists also unearthed more than 28 polished bone tools, some of the oldest of their kind in Africa.
Evidence of complex behavior comes from a 100,000-year-old ochre-processing workshop found in the cave. The kit consisted of two abalone shells (Haliotis midae) used as containers, which still held residue of a red, pigment-rich mixture. The compound contained ground ochre, crushed and heated mammal bone, charcoal, and a liquid binder. This find represents the earliest known example of humans creating and storing a compound substance. Also found in the cave are more than 65 shell beads made from Nassarius kraussianus shells, indicating personal ornamentation and expression were part of life for these early Homo sapiens.