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answ2. No. For several reasons. When there is a major extinction event, there is not necessarily any carry-through of evolution of species.

Where there is a physical interruption to a column, for example by erosion, there may be a 'regional unconformity'.

But there are enough of the pieces of the puzzle left for the concept to be very useful, even if no perfect example can be found.

By analogy, the Rosetta Stone is incomplete - would we consider that evidence that it was never complete.

There is a valuable saying "Absence of evidence does not prove evidence of absence."

A1. No. The idea of the geologic column is a hypothetical one. There is no proof that it exists, so nowhere like this on Earth.

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