Argon–argon dating of volcanic ash overlying ochre fragments found there has dated what may represent some of the earliest human aesthetic sensibility to 285,000 years ago. The ochre fragments must have been brought to the site by human agency and may have been used as body adornment.
Tryon, CA and McBrearty, S, 2002, "Tephrostatigraphy and the Acheulean to Middle Stone Age transition in the Kapthurin Formation, Kenya", Journal of Human Evolution 42, 211–35, qtd in Scarre, C (ed.) (2005). The Human Past, London: Thames and Hudson. ISBN 0-500-28531-4.