Calibration of the Radiocarbon timescale is traditionally based on tree-rings dated by dendrochronology. At present, the tree-ring curve dates back to about 9900 BC. Beyond this limit, marine datasets extend the present calibration curve INTCAL98 to about 15600 years ago. Since 1998, a wealth of AMS measurements became available, covering the complete 14C dating range. No calibration curve can presently be recommended for the older part of the dating range until discrepancies are resolved.
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