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law of superposition
CATEGORY: term
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.
superposition
CATEGORY: term
DEFINITION: The principle that artifacts found at a lower level of a site predate those at a higher level. The order in which sedimentary layers are deposited, the highest being the youngest.

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