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This subject has the fancy name of Dendrochronology.The Wikipedia article says: For the entire period of a tree’s life, a year-by-year record or ring pattern is formed that reflects the climatic conditions in which the tree grew. Trees from the same region will tend to develop the same patterns of ring widths for a given period. Following these tree-ring patterns from living trees back through time, chronologies can be built up, both for entire regions, and for sub-regions of the world.
The reconstruction provides a high-resolution representation of temperature patterns in the Roman and Medieval Warm periods, but also shows the cold phases that occurred during the Migration Period and the later Little Ice Age.
Some partial chronologies were created, by pairing the set of all tree samples (living, dead, archaeological remains) with the living trees belonging to each subset.
We computed the contours of tree-growth variations (on both 100-year and longer time scales) for each subset, ending with six pairs of these partial subset chronologies.
Two sums of all these partial chronologies thus yielded a record of precipitation variations over a period ranging from 2627 BCE up to 2012 CE.
It was found that this record shows a high degree of similarity to the existing chronology produced using the regional curve standardization (RCS) method applied to the same dataset, indicating that the eigenvalue chronology is capable of faithfully extracting long-term climatic variations.
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This is a problem for creationists, which brings us to the article at the website of : Biblical Chronology and the 8,000-Year-Long Bristlecone Pine Tree-Ring Chronology. So, unless we choose to push the Flood back many thousands of years, effectively disregarding biblical chronologies, how can the conflicting chronologies be reconciled? The observable facts appear to contradict a literal interpretation of scripture. In our experience, most creationists just ignore such problems and stick with scripture. S., yet none of them is known to have ever produced more than one ring per year.