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And a Canadian database is poised to help researchers around the world to organize this trove of archaeological and palaeontological data, and to address problems that have plagued carbon dating for years.Set up in the 1980s, the Canadian Archaeological Radiocarbon Database (CARD) is undergoing an expansion that began in 2014.Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.

In the past, this information wasn’t often published alongside carbon dates, says Thomas Stafford, a radiocarbon-dating consultant in Lafayette, Colorado.

Given enough properly dated archaeological finds, some experts argue that they can start to make careful population estimates and trace how human populations moved over space and time. Others argue that such data sets can be biased by archaeologists’ interests in particular areas or time periods: an abundance of radiocarbon dates in a given spot or time might reflect a researcher’s focus rather than real demographic change.

But the CARD database is getting large enough to iron out such factors, says Kelly.

The first such site should come online within the year.

There are other radiocarbon databases out there, but CARD is by far the largest, says Robert Kelly at the University of Wyoming in Laramie, who is collecting data to contribute to CARD. “We’ve spent 60 years running radiocarbon dates, and you can do a lot with them if they’re all in one place.” Radiocarbon dating uses the ratio of stable carbon atoms to a radioactive isotope called carbon-14 in the material to determine the age of a once-living specimen.




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