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The simplest situation for a geologist is a "layer cake" succession of sedimentary or extrusive igneous rock units arranged in nearly horizontal layers.

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.

The principle of superposition therefore has a clear implication for the age of a vertical succession of strata.For example, the principle of superposition is based, fundamentally, on gravity.In order for a layer of material to be deposited, something has to be beneath it to support it.An early summary of them is found in Charles Lyell's .In no way are they meant to imply there are no exceptions.They are the "initial working hypotheses" to be tested further by data.