Dendrochronological methods are a key part to our research team’s success. While analyzing and drawing conclusions from data is essential, it is equally as important to ensure the proper collection, preparation, and handling of samples and extraction of ring measurements. There are many key steps to this process in dendrochronology, that when done correctly, ensures the success of a research team.
Taking samples
Tree cores are extracted using an increment borer. By manually drilling the auger into a tree, the core is preserved inside the increment borer with minor injury to the tree. The core extractor, a half circular metal tray, then fits into the auger bit. After cranking the handle counter clockwise, the core then fully separates from the body of the tree. Pulling the core extractor out of the auger allows the extraction of a tree core.
Increment borer.
Selecting the right tree within a stand is crucial to obtaining a good sample. It is important to consider factors such as tree health and direction of lean before coring. Trees that lean excessively can be more difficult to core, as the wood is under more directed pressure. We aimed for trees that stand tall, with little to no lean. If there is
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Guest Blogger: Lynnsey Delio, The Keck Geology 2025 team has been working in the Wooster dendrochronology lab for the first week of research. The team cored the oak tree in front of Scovel on day 1 for some practice coring. They also made use of the woodshop in Scovel Hall and practiced sanding and mounting cores.
Dexter, Lynnsey, Lev, and Landon coring the oak tree in front of Scovel Hall.
Lev with a core reveal!
The team has also been working with programs COFECHA and CooRecorder in the computer lab to mark the tree rings on red cedars from Southeast Alaska. They have been working to create an optimized red cedar tree ring series for the area, dating back centuries. This data can be used to compare to other tree ring series and look for climate signals and responses. These climate responses can be analyzed from a global climate perspective to understand the correlation between dendrochronology and global climate phenomena.
To accurately date the cedar cores, the team used cores from previously dated red cedars in Southeast Alaska to correlate them to the undated samples. Some of these previously dated cores included logged trees that were intended for use in totem poles.
The team
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Learning about environmental change from tree rings
