Tree ring dating activity

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Objective To learn how scientists determine the age of living and non-living trees. Tell students they will be taking on the role of a dendrochronologist, a tree-ring scientist. Provide each student with two copies of the "Tree-Ring Science" student handout. Students will be crossdating tree-ring samples to determine which sample is oldest, and will then determine the age of the oldest sample.
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Dendrochronology - Tree Rings as Records of Climate Change

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Solar activity reconstructed over a millennium

Previously on StoneAgeMan, we covered relative and radiocarbon dating methods. Trees produce rings each year that they grow. Trees grow more during wet years, producing wide rings, and less during dry years, leaving narrow rings. Since no two years have the same precipitation levels, this generates unique patterns of wide-to-narrow rings.
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Count the Tree Rings

Trees are timekeepers. Trees are also meticulous record keepers of climatic conditions. By unraveling the rich data stored in tree rings, scientists can do everything from dating archaeological sites and preventing forest fires to documenting planetary history and offering a crystal ball into our environmental future. Anything that affects a tree — precipitation, temperature, nutrients in the soil, fires, injuries — can show up in the rings.
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Ron Towner from the Laboratory of Tree-Ring Research at the University of Arizona explains the principles behind dendrochronology and why this dating method is valuable to archaeologists. Ron demonstrates how to accurately count tree-rings, and discusses the importance of patterns and master chronologies. Trees are often used to make analogies about the past.
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