Law of Superposition

The law of superposition (or the principle of superposition) is a key axiom based on observations of natural history that is a foundational principle of sedimentary stratigraphy and so of other geology dependent natural sciences:

Sedimentary layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top.

The law was formulated in the 17th century by the Danish scientist Nicolas Steno.

Read more about Law Of Superposition:  Development of The Law of Superposition, Application of The Law of Superposition, Superposition As Modified By Archaeological Considerations

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