This latest system of dating developed by intcal, an international working group, was based on dating coral samples from the ocean floor.
Intcal extended radiocarbon dates beyond the limit of dendrochronology by basing it on “matched uranium series and radiocarbon dates on fossil corals, coupled with radiocarbon-dated organic material from laminated marine sediments in the Cariaco Basin, Venzuela” (Mike Walker, Quartenary Dating Methods, 2005). They apparently increased the effectiveness of radiocarbon dating by basing their calibration charts on radiocarbon-dated coral and sediment layers!
And what was it that finally got the scientists to agree on their uncertain calibration curve? The problem with all these theories and conclusions is that they hark back to the scientists’ blind belief in the false theory of evolution.
That is about the only thing the scientists agree on, yet it causes much confusion and chaos.
But they still have to verify their calibrations with samples of known dates. Radiocarbon dates can only be trusted up until the record left by trees can back them up.