A few principles were recognized and specified later.
An early summary of them is found in Charles Lyell's .
I thought it would be useful to present an example where the geology is simple, and unsurprisingly, the method does work well, to show the quality of data that would have to be invalidated before a major revision of the geologic time scale could be accepted by conventional scientists.
Geochronologists do not claim that radiometric dating is foolproof (no scientific method is), but it does work reliably for most samples.
In such a situation, the "principle of superposition" is easily applied, and the strata towards the bottom are older, those towards the top are younger.
There are situations where it potentially fails -- for example, in cave deposits.My thanks to both him and other critics for motivating me.Much of the Earth's geology consists of successional layers of different rock types, piled one on top of another.ECRIN is a public, non-profit organisation that links scientific partners and networks across Europe to facilitate multinational clinical research.We provide sponsors and investigators with advice, management services and tools to overcome hurdles to multinational trials and enhance collaboration.