Carbon 14 dating accuracy
Why should the percentage of lead to uranium in zircon crystals (the key to ordinary uranium-lead, radiometric dating) depend on which geologic period they are found in?
If most of the geologic column were created during Noah's flood, would it really matter whether a zircon crystal was found in Cambrian strata or Cretaceous strata, in Jurassic strata or Tertiary strata?
By then, the relative ages (order) of the geologic column had already been worked out in some detail.
Radiometric dating would later confirm the relative ages of the strata and tie them to absolute dates.
Your chances are 6.2 billion to one of getting the right order for all thirteen.
And, when you consider that each period can also be divided into "upper, middle, and lower," the odds of arranging them in the correct order by pure chance become astronomical. It has correctly placed the Cambrian between the Precambrian and the Ordovician, the Ordovician between the Cambrian and the Silurian, the Silurian between the Ordovician and the Devonian, and so forth.
Noah's flood might just as easily deposit the same crystal in one place as another. Pressure has nothing to do with it, and zircon crystals all have about the same density as their total lead content is small.
Just what is it that a Cambrian stratum has which a Cretaceous stratum lacks?
It was found that certain fossils, now referred to as index fossils, were restricted to a narrow zone of strata.One would think that the flood sediments (gathered from the four corners of the old antediluvian world) and their associated igneous rock (formed during the flood) would all register very little radiometric age.At the very least we would expect random fluctuations if the radiometric methods were totally at sea.(Far from being a rubber stamp, radiometric dating would go on to revolutionize our understanding of the Precambrian.) Thus, it became possible to date strata directly from index fossils.Note that evolution has nothing to do with how the index fossils are used to date strata!