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For the purpose of climate reconstructions, it is essential to determine the changes in ring widths associated with age or other factors and to remove them from the measurements.
In other circumstances, a ring may be absent at some point on the tree, and therefore is only seen when a cross-section of the tree is taken (locally absent).
These plots are used to relate a group of cores to each other by pattern matching.
Narrow rings are recorded as they occur on strips of graph paper with 2 mm divisions.
You should collect the cores as close to the ground as possible, to get the maximum number of rings.
Since growth of the tree begins at the root system, a core taken above the base may have a much younger estimated age than one taken directly at ground level.
When discrepancies are found, another researcher checks the cores to verify proper crossdating techniques.