If tree rings were an effective way of determining age polystrate trees would be serious problem for dating strata.
Some will say that has been debunked but that is wishful thinking because these trees are buried by several layers of strata.
Dendrochronology From Wikipedia, the free encyclopedia
The growth rings of a tree at Bristol Zoo, England. Each ring represents one year; the outside rings, near the bark, are the youngest.
Dendrochronology (from δένδρον, dendron, "tree limb"; χρόνος, khronos, "time"; and -λογία, -logia) or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree rings, also known as growth rings. Dendrochronology can date the time at which tree rings were formed, in many types of wood, to the exact calendar year. This has three main areas of application: paleoecology, where it is used to determine certain aspects of past ecologies (most prominently climate); archaeology, where it is used to date old buildings, etc.; and radiocarbon dating, where it is used to calibrate radiocarbon ages (see below).
In some areas of the world, it is possible to date wood back a few thousand years, or even many thousands. Currently, the maximum for fully anchored chronologies is a little over 11,000 years from present.[1]
Dendrochronology - Wikipedia, the free encyclopedia
LOOKY HERE
Myths Regarding Radiocarbon Dating WHY AM i NOT SUPRISED THEY WOULD SAY Dendrochronology HAS BEEN DEBUNKED.LOL!
[ame=http://youtu.be/zIBXk7s3RtY]Debunking CDK007 - 'Why Young Earth Creationists are Wrong' (dendrochronology) - YouTube[/ame]