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{{Short description|Method of dating based on the
[[File:tree.ring.arp.jpg|thumb|The growth rings of a tree at [[Bristol Zoo]], [[England]]. Each ring represents one year; the outside rings, near the bark, are the youngest]]
[[File:Tree cookie in Royal Ontario Museum 2023a.jpg|thumb|A "tree cookie" cross-section of a [[Pseudotsuga menziesii var. menziesii|Coast Douglas-fir]] tree displayed in the [[Royal Ontario Museum]]. The tree was over 500 years old when it was cut down in [[British Columbia]] in the 1890s. The markings indicating historical events were added in the 1920s.]]
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