Getting the Dates
After doing all of this:
Skeleton plotting the core
Showing the master chronology
Matching the pattern of your skeleton plot with the master
Accounting for possible ring-growth anomalies of absent or false rings
Now determine the actual dates of the virtual sample and consider possible
paleoenvironmental applications
.
When
you try skeleton plotting for yourself
, you can find the start and end dates:
Assume that the virtual sample had 21 rings
The skeleton plot extends from line #0 to line #20, as on the right
The pattern matching with the master chronology is obvious
Therefore:
The first ring (line #0 on the skeleton plot) corresponds to 1809
The last ring (line #20 on the skeleton plot) corresponds to 1829
Year dates of formation of all 21 rings are now known
Congratulations
: This sample is crossdated by skeleton plotting
When
you try skeleton plotting for yourself
, you can check your answers:
There will be a button to "Show or Hide Answers," as on the left
When you mouse click to show answers, a box of answers will appear, as on the right
If the sample had
ring-growth anomalies
, then the answer will include dates of absent/false rings as well
Introduction
|
Dendrochronology Applications
|
Crossdating Application
|
Ring-Growth Anomalies
Relative Scale
|
Sensitivity-Complacency
|
Skeleton Plotting
|
Master Chronology
Pattern Matching
|
Finding the Dates
|
Absent/False Rings
|
Try Skeleton Plotting for Yourself!
Laboratory of Tree-Ring Research
Paul R. Sheppard
(520) 621-6474
Laboratory of Tree-Ring Research, The University of Arizona
Tucson, Arizona 85721 USA
sheppard@ltrr.arizona.edu
Copyright © 1998, Laboratory of Tree-Ring Research
Revised -- October, 1998
URL:
http://tree.ltrr.arizona.edu/skeletonplot/introcrossdate.htm