Extending the Calibrated Radiocarbon Record

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Abstract
The radiocarbon record is an important tool for accurate dating of climatic records, archaeological artifacts, and other records of past events. A calibrated record exists up to 24,000 years ago, but as Bard explains in his Perspective, extending the record beyond this time has been difficult. He highlights the record by Beck et al., which covers 24,000 to 45,000 years before present. The record shows large fluctuations in the radiocarbon ratio and is an important step toward an extended calibrated record.