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Such recurring events as mountain building and sea encroachment and believed to be recorded in rock layers that comprise units of geologic time.

Therefore, the actual length of geologic time represented by any given layer is usually unknown or, at best, a matter of opinion.

The relative dating methods themselves are generally sound when used with good assumptions.

However, when scientists apply relative dating to a preconceived uniformitarianism model, the dating methods are only as good as the model.

Ice core sampling normally uses the assumption that the ring bands observed represents years.

One known example where this assumption was used is very misleading.

Consequently, today the dates assigned to the “standard geologic column” are still based upon Lyell’s assignment where index fossils are used to date the rocks and the rocks are used to date the fossils. Today, it is not surprising that many geologists are rejecting uniformitarianism and embracing catastrophism again.