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So, by comparing many different trees in a forest in South Germany, and performing radiocarbon dating on a large number of samples, a calibration scale was developed.Other researchers did similar work in a forest in Northern Germany.
In addition to tree rings, scientists have looked at what are called lake varves in Northern Sweden.
Bristlecone pine is both worse and better to use than oak.
It is worse, in that the rings are very thin, and roughly 5% of the time the tree either does not grow a ring in a year or else grows two rings.
A more difficult to deal problem with radiocarbon dating came from Egyptian and Mesopotamian artifacts when the dates were already known.
In Egypt, Assyria, Babylonia, and Sumeria, there are "king lists" of who reigned and for how long.
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Now trees shed their leaves in the fall, and the leaves that fall in a lake form a thin layer at the bottom.