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The relatively short-lived C taken into organic matter is also slightly variable. However, under about 20,000 years the results can be compared with dendrochronology, based on tree rings.

For the most accurate work, variations are compensated by means of calibration curves.

Carbon 14 is a common form of carbon which decays over time.

The amount of Carbon 14 contained in a preserved plant is modeled by the equation $$ f(t) = 10e^.

Current projects involve researching the history of Arnhem Land ancestral sites in northern Australian, surveying and excavating shell mounds across Cape York Peninsular, studying the high-resolution store of information about past environmental conditions from sub-fossil kauri logs and identifying how Asian civilisations emerged.

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