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2019-02-23 22:32 Problems with Tree-Ring Dating. The most questionable assumption in dendrochronology is the rate of ring formation. General principles of biology and climate suggest that trees add only one ring each year. Individual bristlecone pines, which grow very slowly in arid, high altitude areas of western North America, will sometimes skip a year of growth. Tree ring dating helps answer questions about pre-Columbian life in the Mesa Verde region.


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