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Intro to Tree-Ring Dating Jan 12, 2009. Crossdating.

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Presentation on theme: "Intro to Tree-Ring Dating Jan 12, 2009. Crossdating."— Presentation transcript:

1 Intro to Tree-Ring Dating Jan 12, 2009

2 Crossdating

3

4 Crossdating is the procedure of matching and synchronizing ring-width patterns among trees that have grown in nearby areas, allowing the identification of the exact year in which the ring was formed. Dated and measured rings from a number of trees in a region are combined to form a tree- ring chronology.

5 Crossdating A tree-ring chronology must have at least 50 trees or wood samples from the same genus. This will decrease the influence of noise. The chronology can be used as a tool for dating events that caused tree death or a marked change in the appearance of a ring or set of rings.

6 Anomalies in Ring Growth Missing ring – a ring that is entirely absent from a tree Locally absent ring – a ring that is not present throughout the entire circumference of the tree

7 False ring – when it appears that more than one ring has been created in 1 growing season Anomalies in Ring Growth

8 Skeleton Plots Skeleton plot is a graphical representation of ring width patterns, used in crossdating. du/skeletonplot/Skeleto nPlot19.htm

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