quote:
Radiometric content is content, nothing more. It is only by uniforitarian assumption and model that we assign isotopic content an age due to assumed uninterupted process. The age model was erected by Lyell, father of uniformitarianism (to a degree). But, as the above article shows, if interpretations based upon his model of stratigraphy are shown by the evidence to be in error, and our current age models are based upon his assumptions, doesn't that put an amount of contingency on the ages we assign to isotopic content from samples that come from those same stratigraphic layers?
At first glance it may seem circular, especially when deliberately presented that way. However, science uses many different non-radiometric methods to corroborate radiometric dates. Historical records, tree rings, ice cores, and varves are all examples.