That each successive layer of sediments is deposited on top of the previous layer, and hence is younger than the lower layer, is a statement of the

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The principle of superposition states that in an undeformed sequence of sedimentary rocks, each layer of rock is older than the one above and younger than the one below. This principle allows geologists to determine the relative ages of rock layers and their contained fossils.

That Each Successive Layer of Sediments Is Deposited on Top