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The assumptions are similar to the assumptions used in carbon dating.
The mathematical premise undergirding the use of these elements in radiometric dating contains the similar confounding factors that we find in carbon-14 dating method.
At first glance, it appears easy to date tree rings by just counting them, but reality is often more complicated than that.
Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.
Also, many fossils are contaminated with carbon from the environment during collection or preservation procedures.
Scientists attempt to check the accuracy of carbon dating by comparing carbon dating data to data from other dating methods.
These artifacts have gone through many carbon-14 half-lives, and the amount of carbon-14 remaining in them is miniscule and very difficult to detect.
Carbon dating cannot be used on most fossils, not only because they are almost always allegedly too old, but also because they rarely contain the original carbon of the organism that has been fossilized.
This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.
The age of the carbon in the rock is different from that of the carbon in the air and makes carbon dating data for those organisms inaccurate under the assumptions normally used for carbon dating.
Thus, studying this variation leads to improved understanding of past environmental conditions and is the basis for many research applications of dendrochronology.
A key distinction of dendrochronology is that all trees rings being analyzed are dated to their correct year of formation.