# Christopher Henshilwood Up: [[Consciousness, Neural Transduction and Human Origins]] Archaeologist (University of Bergen and University of the Witwatersrand), excavator of Blombos Cave, South Africa. ## Relevance - Engraved ochres from Blombos date to about 100–75 ka (Henshilwood et al., J Hum Evol 57:27, 2009). This is symbolic behavior well before 50 ka.