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Over the past three years, I have been working on revising these principles and I've presented numerous talks across the U. Eventually, I settled on the principles below as being representative of those to which we actually should adhere and have been adhering.
Usually this process tries to remove the growth trends due to normal physiological aging processes and changes in the surrounding forest community.Example: dating the growth suppressions left in tree rings from western spruce budworm outbreaks in the past.A layer of wood cells produced by a tree or shrub in one year, usually consisting of thin-walled cells formed early in the growing season (called earlywood) and thicker-walled cells produced later in the growing season (called latewood).Crossdating is considered fundamental principle of dendrochronology – without the precision given by crossdating, the dating of tree rings would be nothing more than simple ring counting! Baillie said it best in his 1982 book (page 263): "A tree-ring sample either dates or it does not.For example, one can date the construction of a building, such as a barn, pueblo, or log cabin, by matching the tree-ring patterns of wood taken from the buildings with tree-ring patterns from living trees. No amount of pressure will make a tree-ring pattern match if it does not." If you cannot confidently assign exact years (calendar or relative) to your tree-ring samples, then you cannot report any "possible" dates for that sample!NOTE TO READERS You may notice that the principles below represent a major change in the way we approach dendrochronology.
This is because, as a scientific discipline evolves, so too must the principles to which it adheres. I kept adding new principles while simultaneously revising or even deleting long familiar principles.
Example: dating the fire scars left in tree rings to determine how often fires occurred in the past.
The science that uses tree rings to date and study the past dynamics of insect populations.
Example: dating when trees were inundated by water to determine the sequence of lake level changes over time.
The science that uses tree rings to date and study past and present changes in wildfires.
We DO NOT give "possible" dates or dates with a plus or minus factor!