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bed

1. n. [Geology]

A layer of sediment or sedimentary rock, or stratum. A bed is the smallest stratigraphic unit, generally a centimeter or more in thickness. To be labeled a bed, the stratum must be distinguishable from adjacent beds.

See: bed thicknesscompetentdipping bedlaminationprogradationretrogradationsedimentstrikesuperpositiontrue stratigraphic thicknesstrue vertical thickness

Relative thicknesses of laminations, beds and strata
Relative thicknesses of laminations, beds, and strata.

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