Tree ring dating examples


04-Feb-2018 05:29

This is accomplished using wood specimens found preserved, for example, in historic buildings, or on the forest floor, or in peat bogs.

If the older timber retains its bark, the year that it was felled will be recorded by the outermost ring, the ring which was grown in the year that the tree was felled.Generally, it is not possible to construct a complete sequence of tree rings back through the historical periods using only living trees.Chronologies derived from living trees must be extended.The following article is abstracted from The Biblical Chronologist Volume 5, Number 1. The science of constructing chronologies from tree rings is called dendrochronology. Modern trees are known to produce one growth ring per year. (The idea that ancient trees grew more than one ring per year will be discussed below.) Therefore, by coring a living tree and counting rings from the present backwards, it is possible to determine the year in which each ring grew. The bristlecone pines in the White Mountains of California live to extremely old ages, some in excess of 4,000 years.

The University of Arizona dendrochronology lab sports a (no longer living) specimen which contains over 6,000 rings.Your response will be judged on the quality of your writing and on how well your response presents the key points in the passage.



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