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As archaeological dating techniques go, dendrochronology is extremely precise: if the growth rings in a wooden object are preserved and can be tied into an existing chronology, researchers can determine the precise calendar year--and often season--the tree was cut down to make it.

Because of that precision, dendrochronology is used to calibrate ​radiocarbon dating, by giving science a measure of the atmospheric conditions which are known to cause radiocarbon dates to vary.

When dating a wooden element, the dendrochronologue specifies, amongst other things, the geographical provenance of the used tree, allowing to reconstruct trade networks of raw materials.

In addition a dendro-archaeological study allows to rediscover the old know-how of wood artisans, supplies indications concerning forest management, the selection of raw materials, etc.

However, the home owner is becoming more and more interested in knowing the exact dates of construction of both their houses and their barns.There is an overlap for the years 1870-1910: both trees have the same pattern of thick and thin annual rings.Dendrochronology is the formal term for tree-ring dating, the science that uses the growth rings of trees as a detailed record of climatic change in a region, as well as a way to approximate the date of construction for wooden objects of many types.In wet and warm years, trees grow well, in cold and dry years hardly at all.A thin annual ring therefore is an indication for a cold year and a thick ring is prove that the year was warm.The oak slice from the Tredyffrin double log crib English Lake District style bank barn located near Devon in Chester County, Pennsylvania was dendro-dated to 1779.This barn type is an extreme rarity in Pennsylvania.Dendro-dating can be a very effective although not foolproof way of creating data that can often lead to discerning the age of construction of various buildings and structures in the northeast and beyond.There are, however, certain criteria that must be satisfied or met in order that a wood testing on any particular building will yield good to even excellent but not guaranteed results.The expertise is presented in the form of a report describing the full protocol of the analyses, the results of the study and the dendrochronological data, all this illustrated with graphs and figures.The contributions of a dendrochronological analysis go beyond simple dating.