Crossdating by skeleton plotting

Examples of results are presented for specimens from sensitive, moderate, and complacent sites.

FORTRAN program listings are included for two subroutines for (a) identifying small rings and (b) producing the plot.

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Skeleton plotting is an established manual technique for representing the relative narrowness of tree rings in a single radius.

Following surface preparation, you can begin the process of crossdating.

This is probably the most fundamental and important aspect of tree ring research.

This paper describes a method for deriving these plots by computer.The method uses a low-pass digital filter, running means, and standard deviations of ring-width measurements.When the manual and computer plots are compared for the same series, approximately 85% agreement is found.Here, the curve is shown detrended (and somewhat zoomed out) to make the calculations behind the skeleton lines more obvious.(The slider (trackbar) of the "Settings/Plotting window settings/Set relative height of ring width curves" has also been somewhat adjusted to make the ring width curve higher.) When there is a reference available, this is plotted as a blue upside-down skeleton plot.