Relative dating of rock strata group dating ideas lds youth

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?

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That is, an index fossil corresponded to a very specific point in the geologic column.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?By the 1830's Adam Sedgwick and Roderick Murchison established a correlation between the various types of fossils and the rock formations in the British Isles.It was found that certain fossils, now referred to as index fossils, were restricted to a narrow zone of strata.

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