bed

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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

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