Radiocarbon dating inaccurate
In the 70's: If this sort of thing interests you, you should find the journal Radiocarbon and read one of the issues devoted to calibration.For example, see Radiocarbon 46,1029 (2005), which has a calibration curve that goes back 26,000 years.On the Web, you could visit a dating laboratory, visit a dating service, read an encyclopedia entry or read a critique.
However, even this small an adjustment was a bit of a shock.
When this was first done, it turned out that carbon dating had been giving too-young dates for early civilizations.
Apparently, the production of C14 by the Sun has changed by several percent across the last 10,000 years.
If you hear of a carbon dating up in the millions of years, you're hearing a confused report. Second, they rarely contain any of the original carbon.
We can't date oil paints, because their oil is "old" carbon from petroleum. And third, it is common to soak new-found fossils in a preservative, such as shellac.