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The first technique to yield tangible ''direct'' dates for rock art was the determination of 14C in a secondary calcite skin reprecipitated over petroglyphs in Malangine Cave, South Australia (Bednarik, 1981, 1984).
The approximate age of reprecipitated calcite is therefore measurable by determination of its remnant content of radiocarbon, at least in theory (Wendt et al.
The preferred materials for analysis are carbonates (particularly reprecipitated carbonates, such as travertines, speleothems, corals and marl, also mollusc shells, bone and teeth) but other materials may be suitable.
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