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Over this time interval, the Caricao data set used by Int Cal04 differs by more than 200 years from the tree ring and our coral calibration data.The photo images of the Cariaco sediment layering (Hughen et al., 2004) shows very weak to indistinct layers in the 13,250 to 14,000 year interval where the offset of Cariaco data with the tree ring and coral data sets is most apparent.Another difference between the selections of Int Cal04 versus our calibration program is philosophical.Seven years elapsed between publication of Int Cal98 and Int Cal04 although the majority of new data between 14,000 and 26,000 are from our laboratory.Carbon-14 dating is a way of determining the age of certain archeological artifacts of a biological origin up to about 50,000 years old.It is used in dating things such as bone, cloth, wood and plant fibers that were created in the relatively recent past by human activities.A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.

The Fairbanks curve (Fairbanks et al., 2005; 2007) and Int Cal04 curve (Reimer et al., 2004) use the same tree ring data set from 0 to 12,410 cal yr B. and the two different radiocarbon calibration programs yield nearly identical results over this interval (See Cal Pal web site for a comparison).

BP using coral samples from our offshore coral reef core collections from Barbados (13.10°N; 59.32°W) in the western tropical Atlantic and Kiritimati Atoll (1.99°N, 157.78°W) in the central equatorial Pacific, and from the uplifted reefs of Araki Island (15.63°S; 166.93°E) in the western Pacific.

In addition, we have reanalyzed the radiocarbon and U age dates from our earlier radiocarbon calibration work using new pretreatment and analytical techniques and state-of-the-art instrumentation at higher precision; we report these new results in this WEB site and in Fairbanks et al., (2005).

It is estimated that nearly 90% of all measurements made at the more than 50 active accelerator mass spectrometry laboratories are radiocarbon dates.

This dramatic increase in the number of radiocarbon dates is driving the demand for a radiocarbon calibration program that spans the entire radiocarbon timescale from the present to 55,000 years BP.

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