dendrochronology

n. method of dating material from archaeological sites where trees have survived based on the annual growth rings in tree trunks

Dendrochronology or tree-ring dating is the method of scientific dating based on the analysis of tree-ring growth patterns. This technique was invented and developed during the 20th century originally by A. E. Douglass, the founder of the Laboratory of Tree-Ring Research at the University of Arizona. The technique can date wood to exact calendar years.
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A method of absolute dating that uses the number of tree rings found in a cross section of a tree trunk or branch to determine the age of the tree.

The study of growth rings in logs to determine climates

dendrochronology
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