Dendrochronology cross dating
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Calibration is not only done before an analysis but also on analytical results as in the case of radiocarbon dating—an analytical method that identifies the age of a material that once formed part of the biosphere by determining its carbon-14 content and tracing its age by its radioactive decay.
There are seven dendrochronological principles that contain certain assumptions, that are used as a framework or theory to interpret tree-ring data.
Essentially what is the most practiced principle is comparing dates of tree-ring series from one tree to many other trees from a different location.
Wide rings are produced during wet years and, narrow rings during dry seasons.