Dating conventions

Unless otherwise stated, the following conventions for dates are used in the text

and figures:


Before Present (Present = 1950) when associated with a

radiocarbon date

cal. years BP

years before present for radiocarbon dates after calibration to

calendar years using a standard function

years BP

years before present where mixed chronologies are shown on

one figure (e.g. uranium series and radiocarbon dates)

years ad

calendar age


thousand years ago


thousand year time span

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