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Finally, the technique can only date the rings in a sample. The outer rings are the most recent (and only the ring directly under the bark is capable of providing the actual felling year of the tree), and these outermost edges of trees are often cut off during the process of converting round trees into square beams. In oak these rings are also sapwood, rather than heartwood, which makes them much more vulnerable to beetle attack or physical abrasion. Hence, it is only by careful selection of the available material, and no small amount of skill and luck, that samples that provide dates precise to the felling year are obtainable, otherwise estimates of the numbers of missing rings have to be made which provide a less precise date for the structure of interest.
For more information please contact the secretary of the Pembridge Amenity Trust info@pembridgeamenitytrust.co.uk
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