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Its outer growth rings were compared with the inner rings of a living tree.If a pattern of individual ring widths in the two samples prove to be identical at some point, we can carry dating further into the past.Numerous studies illustrate how ring-counting leads to incorrect conclusions drawn from inaccurate dating.Dendrochronologists demand the assignment of a single calendar year to a single ring.With this method of matching overlapping patterns found in different wood samples, bristlecone chronologies have been established almost 9,000 years into the past.Sensitivity It is an oversimplification to say that dendrochronology is ring counting based on rainfall and the physiology of trees. This is especially true with the old bristlecones, as their growth can be affected by slope gradient, sun, wind, soil properties, temperature and snow accumulation.In the spring, when moisture is plentiful, the tree devotes its energy to producing new growth cells.



New wood grows from the cambium layer between the old wood and the bark.Review all the principles of dendrochronology as complied by Chronology Building The climatic changes or patterns in specific geographic areas can be traced by the study of old living trees.Samples taken from trees of unknown age can then be studied for matches with samples from trees with known sequences of growth.Trees showing sensitive rings are those affected by conditions like slope gradient, poor soils, little moisture.

Those showing complacent rings have generally constant climatic conditions such as a high water table, good soil, or protected locations.

Often several sample cores are taken from each tree examined.



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