Antiquity last year reported a startlingly old series of dates from Jinmium in tropical north Australia. At Jinmium are old rock-engravings, the pecked cups or cupules that are widespread in Australia. This study of the Jinmium cupules goes beyond that immediate topic to broader issues.
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Taçon et al. (1997) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: