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Complete sections make core dating easier, although this is not always possible!The tree-ring pages have a nice form that you can print out.Eugenia Ferrero, Xiaohua Gou, Esther Jansma, Alexander Kirdyanov, and Jonathan Palmer.
This second annual ring is considered the false ring.
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).
False rings (or double rings) may also occur during a favorable growing season, whereby two rings are formed.
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.
You need multiple cores of a tree to be able to crossdate the cores.