law of superposition

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.
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Universalium. 2010.
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superposition — /sooh peuhr peuh zish euhn/, n. Geol. the order in which sedimentary strata are superposed one above another. Cf. law of superposition. [1790 1800; < F superposition; see SUPER , POSITION] * * * … Universalium
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