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.
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 tree rings of a beam from a ruin in the American Southwest to determine when it was built.
The science that uses tree rings to study present climate and reconstruct past climate.
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.
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.