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See below for details about the 45,000 annual varves in Lake Suigetsu. For example, polar bears that eat seals aren't getting their carbon from an atmospheric source.The second kind are datings on contaminated samples, or on samples which are a mixture.Some corals can be carbon dated, and also dated by another radioactive material, Thorium-230.Pollen found in the Greenland icecap has been carbon dated, and also dated by counting ice layers. Trees grow a thick ring in a good year, and grow a thin ring in a bad year.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.
Both of these man-made changes are a nuisance to carbon dating.
On the Web, you could visit a dating laboratory, visit a dating service, read an encyclopedia entry or read a critique.
The Lake Suigetsu varve calibration was reported by ABC News and was published: Atmospheric Radiocarbon Calibration to 45,000 yr B.
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.