Forestry. Dendrology Leaf Key. 2011_forestry_cg.pdf (application/pdf Object) Dendrochronology. Drill for dendrochronology sampling and growth ring counting The growth rings of a tree at Bristol Zoo, England.
Each ring represents one year; the outside rings, near the bark, are the youngest. Dendrochronology (from δένδρον, dendron, "tree limb"; χρόνος, khronos, "time"; and -λογία, -logia) or tree-ring dating, is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. Dendrochronology can date the time at which tree rings were formed, in many types of wood, to the exact calendar year.