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In this way, an uninterrupted sequence of tree rings can be extended far into the past.
The first such published sequence, based on bristlecone pine tree rings, was created in the 1960s by Wesley Ferguson.
Dendrochronology or the study of tree rings led to the first such sequence: tree rings from individual pieces of wood show characteristic sequences of rings that vary in thickness because of environmental factors such as the amount of rainfall in a given year.
These factors affect all trees in an area, so examining tree-ring sequences from old wood allows the identification of overlapping sequences.
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Source Bayesian Anal., Volume 3, Number 2 (2008), 225-248.