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They can determine the exact calendar year each tree ring was formed.Dendrochronological findings played an important role in the early days of radiocarbon dating.Libraries of tree rings of different calendar ages are now available to provide records extending back over the last 11,000 years.The trees often used as references are the bristlecone pine (Pinus aristata) found in the USA and waterlogged Oak (Quercus sp.) in Ireland and Germany.And indeed, results of calibration are often given as an age range rather than an absolute value.
In practice, tree-ring calibration is not as straightforward due to many factors, the most significant of which is that individual measurements made on the tree rings and the sample have limited precision so a range of possible calendar years is obtained.
BP stands for “Before Present” or “Before Physics” as some would refer to it.
It should be noted that a BP notation is also used in other dating techniques but is defined differently, as in the case of thermoluminescence dating wherein BP is defined as AD 1980.
The tree rings were dated through dendrochronology.
At present, tree rings are still used to calibrate radiocarbon determinations.Suess’s curve, based on the bristlecone pine, used tree rings for its calendar axis.