key bed

noun

Definition of key bed

geology
: a distinctive stratum or group of strata that serves to facilitate correlation in field mapping or subsurface studies : the horizon or bed on which elevations are taken or to which elevations are referred in making a structure contour map

called also key horizon

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“Key bed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/key%20bed. Accessed 10 Aug. 2020.

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