Dictionary of Human Evolution and Biology

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Radiocarbon Years

Since older radiocarbon dates nonsystematically deviate from solar (calendar) years due to inconsistencies in the CO2 reservoir, uncalibrated radiocarbon dates are usually reported as radiocarbon years before present (rybp). Dates subsequently calibrated with solar years (with a method such as CALIB 4.1) are reported as calibrated years before present (cal yr or cal age) or as BP.

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