In an undeformed sequence of sedimentary rocks, each bed is older than the one above and younger than the one below. the preceding is a statement of the law of

Superposition

Explanation:

 The law of superposition is the term which is used to refers to the fundamental concept of the given sedimentary rocks  of unreformed sequence.

 This concept is basically explained about the sedimentary geology and also the different types of relative ages of the each bed in the given sedimentary rock sequence.

 According to the given question, the given above statement is explained about the law of superposition that the each bed in the rocks is older as compared to the above layer and also younger than the given below layer.

 Therefore, Superposition is the correct answer.

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