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What is tree ring dating

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From the beginning of history, we have relied on trees of various types to meet our needs. Much can be learned about a species of tree and its environment by discovering its age, and researchers employ several methods to date trees. The most common, most accurate way to find the age of a tree is to count the number of rings visible when their trunk is cut horizontally. Each year, most trees add an extra layer of growth to their trunks. Over time, their trunks get thicker and thicker.
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How are tree rings used to help date an archaeological site?

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Tree Rings are Used to Accurately Date Cataclysmic Prehistoric Events

Archaeologists have a group of unlikely allies: trees. Dendrochronology, the scientific method of studying tree rings, can pinpoint the age of archaeological sites using information stored inside old wood. Originally developed for climate science, the method is now an invaluable tool for archaeologists, who can track up to 13, years of history using tree ring chronologies for over 4, sites on six continents. Under ideal conditions, trees grow quickly, leaving wide annual rings behind. During droughts, unseasonable cold, and other unusual conditions, growth slows, leaving behind narrow rings. In the early 20th century, astronomer Andrew Ellicott Douglass began studying trees in the American Southwest to learn more about how sunspots affected climate on Earth. Douglass eventually extended his work from living trees to wood used in ancient pueblo sites and began using them to piece together a regional chronology that could be used to date such archaeological sites.
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Tree Rings are Used to Accurately Date Cataclysmic Prehistoric Events

What does the age of a tree have to do with the age of the earth? If, in fact, the oldest tree is years old, so what? Perhaps Dr. Hovind is impressed by the fact that such a tree would have sprouted at about the time Noah's flood ended. If that is the case, then it is time for a reality check.
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Response: I asked several people who know about this field. Their responses are numbered below. C14 dating is very accurate for wood used up to about 4, years ago. This is only because it is well calibrated with objects of known age. Example: wood found in a grave of known age by historically reliable documents is the standard for that time for the C14 content.
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