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law of superposition
DEFINITION: The principle that states that in any pile of sedimentary rocks that have not been disturbed by folding or overturning, the strata on the bottom will have been deposited first. This is the principle that the sequence of observable strata, from bottom to top, reflects the order of deposition, from earliest to latest. Older beds or strata are overlain and buried by progressively younger beds or strata.

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