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Human remains discovered during excavations of cemetery from early Iron Age in Kosiorow village, Eastern Poland.

Inaccuracies Found in Radiocarbon Dating Calibrations Could Change Historical Timelines

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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, southern 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.

Comparison of Radiocarbon Dates to Calendar Dates. Radiocarbon dates underestimate the actual age of the objects being dated, because the ratio of carbon-14 to carbon-12 has not been constant over time. (Source: Howard Morland/ CC BY-SA 3.0)

Comparison of Radiocarbon Dates to Calendar Dates. Radiocarbon dates underestimate the actual age of the objects being dated, because the ratio of carbon-14 to carbon-12 has not been constant over time. (Source: Howard Morland/ CC BY-SA 3.0)

Manning, professor of archaeology at Cornell University and director of the Cornell Tree-Ring Laboratory, is the lead author of "Fluctuating Radiocarbon Offsets Observed in the Southern Levant and Implications for Archaeological Chronology Debates," published in the Proceedings of the National Academy of Sciences.

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.

The Cornell-led team questioned those assumptions.

"We went looking to test the assumption behind the whole field of radiocarbon dating," Manning said. "We know from atmospheric measurements over the last 50 years that radiocarbon levels vary through the year, and we also know that plants typically grow at different times in different parts of the Northern Hemisphere. 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."

Juniperus phoenicea sample from Taybet Zaman, Jordan. Credit: Sturt Manning/Cornell University

Juniperus phoenicea sample from Taybet Zaman, Jordan. Credit: Sturt Manning/Cornell University

The authors measured a series of carbon-14 ages in southern Jordan tree rings, with established calendar dates between 1610 and 1940 AD. They found that contemporary plant material 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. But our work indicates that it's arguable their fundamental basis is faulty -- they are using a calibration curve that is not accurate for this region."

Applying their results to previously published chronologies, the researchers show how even the relatively small offsets they observe can shift calendar dates by enough to alter ongoing archaeological, historical and paleoclimate debates.

"There has been much debate for several decades among scholars arguing for different chronologies sometimes only decades to a century apart -- each with major historical implications. And yet these studies ... may all be inaccurate since they are using the wrong radiocarbon information," Manning said.

"Our work," he added, "should prompt a round of revisions and rethinking for the timeline of the archaeology and early history of the southern Levant through the early Biblical period."

Top image: Human remains discovered during excavations of cemetery from early Iron Age in Kosiorow village, Eastern Poland. Source: CC BY 4.0

The article, originally titled ‘Inaccuracies in radiocarbon dating was originally published on Science Daily.

Source: Cornell University. "Inaccuracies in radiocarbon dating." ScienceDaily. ScienceDaily, 5 June 2018. www.sciencedaily.com/releases/2018/06/180605112057.htm

References

Sturt W. Manning, Carol Griggs, Brita Lorentzen, Christopher Bronk Ramsey, David Chivall, A. J. Timothy Jull, Todd E. Lange. Fluctuating radiocarbon offsets observed in the southern Levant and implications for archaeological chronology debates. Proceedings of the National Academy of Sciences, 2018; 201719420 DOI: 10.1073/pnas.1719420115

 

Comments

I remember reading back in the 1970s that tests then showed that the amount of carbon 14 in the environment varied over different periods. Trying to locate the article but no luck to date.

I’ve heard that volcano eruptions, radioactivity and meteor activity can all alter radiocarbon dating

Purdue University found back in, I think, 2013, that the rate of radioactive isotope decay varies with solar activity. Moreover, the fluctuation in decay rate is observed far enough ahead of the impact of solar ejecta, that the military is now using this to predict when their satellites need to go into protection mode before the flux overwhelms them. The claim, though, is that the change in decay rate is very slight. But, the solar outbursts we've seen were also perceptible only to those with the right equipment to make such observations. Were we to experience another Carrington event, who knows what effect this could have on the apparent dates of all archaeological material. And, since the effect is to slow the decay rate, and because it seems likely that Carrington-class events were once fairly common, all our dates, when judged by current rates, may appear to be orders of magnitude older than they actually are.

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