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Cave deposits and varves have the potential to include old soil carbon, and there are as-yet unresolved issues with fluctuating amounts of C14 in ocean corals.
Beginning in the 1990s, a coalition of researchers led by Paula J.
It was the first absolute scientific method ever invented: that is to say, the technique was the first to allow a researcher to determine how long ago an organic object died, whether it is in context or not.
Reimer of the CHRONO Centre for Climate, the Environment and Chronology, at Queen's University Belfast, began building an extensive dataset and calibration tool that they first called CALIB.
Since that time, CALIB, now renamed Int Cal, has been refined several times--as of this writing (January 2017), the program is now called Int Cal13.
But there are many misconceptions about how radiocarbon works and how reliable a technique it is.
Radiocarbon dating was invented in the 1950s by the American chemist Willard F.
But before that, only fragmentary data is available, making it very difficult to definitively date anything older than 13,000 years.