Answers are grounded in this paper and cite their sources.
H. Opperman, B. Heydenrych, A 22 000 Year-Old Middle Stone Age Camp Site with Plant Food Remains from the North-Eastern Cape, The South African Archaeological Bulletin, Vol. 45, No. 152 (Dec., 1990), pp. 93-99
No takes yet. Share an insight, caveat, or question.
Opperman et al. (1990) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: