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Credit: Cornell University Radiocarbon dating is a key tool archaeologists use to determine the age of plants and objects made with organic material. But new research shows that commonly accepted radiocarbon dating standards can miss the mark—calling into question historical timelines.
Archaeologist Sturt Manning and colleagues have revealed variations in the radiocarbon cycle at certain periods of time, affecting frequently cited standards used in archaeological and historical research relevant to the southern Levant region, which includes Israel, accuracy of fossil dating Jordan and Egypt.
These variations, or offsets, of up to 20 years in the calibration of precise radiocarbon dating could be related to climatic conditions. Pre-modern radiocarbon chronologies rely on standardized Northern and Southern Hemisphere calibration curves to obtain calendar dates from organic material.
These standard calibration curves assume that at any given time radiocarbon levels are similar and stable everywhere across each hemisphere. Juniperus phoenicea sample from Taybet Zaman, Jordan.
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So we wondered whether the radiocarbon levels relevant to dating organic material might also vary for different areas and whether this might affect archaeological dating. They found that contemporary plant accuracy of fossil dating growing in the southern Levant shows an average offset in radiocarbon age of about 19 years compared the current Northern Hemisphere standard calibration curve.
Manning noted that "scholars working on the early Iron Age and Biblical chronology in Jordan and Israel are doing sophisticated projects with radiocarbon age analysis, which argue for very precise findings. This then becomes the timeline of history.
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But our work indicates that it's arguable their accuracy of fossil dating basis is faulty—they are using a calibration curve that is not accurate for this region. And yet these studies Manning et al, Fluctuating radiocarbon offsets observed in the southern Levant and implications for archaeological chronology debates, Proceedings of the National Academy of Sciences Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission.
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Radiometric Dating is Flawed!! Really?? How Old IS the Earth?