Cross dating for dendrochronology

The proper use of COFECHA adds a high degree of confidence that tree-ring samples have been crossdated correctly and measured accurately, ensuring that the environmental signal is maximized.In this paper, I describe the use of COFECHA through all necessary steps, and discuss the meaning of the initial questions posed at program start-up, the various options available in the main menu, the various sections of the output from COFECHA, and interpretation of the diagnostics of crossdating and measurement accuracy.

australis) on a steep 9,000 foot ridge of Pine Mountain in the San Gabriel Range of southern California.

Close-up view of the increment borer, showing the slender wood core that is extracted from the trunk.

The core is sanded and treated with a wood oil to make the rings more distinct.

The rings are very close together and require magnification in order to count them.

Due to the enormous size of the trunk, it was necessary to extrapolate the age based on the radius of the trunk.

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The increment borer removes a small cylinder or core of wood from the tree trunk.

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