law of superposition

law of superposition
: a law in geology: where there has been no subsequent disturbance sedimentary strata were deposited in ascending order with younger beds successively overlying older beds

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Geol. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

Useful english dictionary. 2012.

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