Intro to tree ring dating
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Intro to Tree-Ring Dating. January 15, 2013. Crossdating. Crossdating. Crossdating. 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.

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Intro to Tree-Ring Dating

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Intro to tree ring dating

Intro to Tree-Ring Dating

January 15, 2013


Crossdating

Crossdating


Crossdating1

Crossdating


Crossdating2

Crossdating

  • 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.


Crossdating3

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.


Anomalies in ring growth

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


Anomalies in ring growth1

Anomalies in Ring Growth

  • False ring – when it appears that more than one ring has been created in 1 growing season


Skeleton plots

Skeleton Plots

  • Skeleton plot is a graphical representation of ring width patterns, used in crossdating.

  • http://tree.ltrr.arizona.edu/skeletonplot/SkeletonPlot19.htm


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