Tree ring dating is possible because

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Dendrochronologists date events and variations in environments in the past by analyzing and comparing growth ring patterns of trees and aged wood. Visible rings result from the change in growth speed through the seasons of the year; thus, critical for the title method, one ring generally marks the passage of one year in the life of the tree. Those areas of the animal or plant that grow faster would exhibit higher levels of carbon over time as compared to those parts of the animal or plant that grow more slowly or have stopped growing altogether as in the case of tree rings. Finding a precise year is rarely so clear-cut so a range of dates is selected, hence that radiocarbon dates always come with an error factor. He was right, and the more trees that were added to the record, the greater the size of the data could be extrapolated and the more complete picture we could build of our past climate.

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Before this, their ancestors would have a recognisable tree form, believed to be that of a giant type of fern that began the process of developing a woody stem.

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Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon datingwhich always produces a range rather than an exact date, to be very accurate. Twining "On the growth of timber — Extract of a letter from Mr. It is thought that one or all of these processes explain the fact that trace amounts of carbon are expected in all ancient organic material. In each growth season, trees create a new ring that reflects the weather conditions of that growth season. As might be expected though, the same problems in dating young samples plague the accurate dating of very old samples.

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