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Carbonate speleothems (Moore, 1952) may experience ''radiocarbon rejuvenation'', for example where porosity is available for the deposition of younger carbonate, as well as through isotope exchange in the presence of moisture.
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.
One of these methods, thorium-uranium dating, has been used to estimate the minimum ages of two petroglyph traditions in Malangine Cave, South Australia, which were both concealed by subsequent secondary calcite skins (speleothems).
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