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 Tree-ring calibration
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Dendrochronologists have accumulated a continuous record of tree rings of known age back to about 12,500 years before present.
These include pine and oak trees from North America and Europe, among others.
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Radiocarbon ages of wood from tree rings of known age have been replicated from a number of laboratories around the world with high precision.
Δ(Age) ≈ 0.2% or ±16 years
Plots of true age (from tree rings) vs. radiocarbon age allow one to calibrate radiocarbon ages.
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