1. 1. Loy, T.H. Science 220,1269 (1983). 2. Loy, T.H. in Archaeometry: Further Australasian Studies (eds Ambrose, W.R. & Mummery, J.M.J.) 57 (Australian National University, Canberra, 1987). 3. Loy, T.H. Can. J. Archaeol. (in the press). 4. Sealy, J. Stable Carbon Isotopes and Prehistoric Diets in the South-western Cape Province, South Africa (BAR Int. Series 293, Oxford, 1986).