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In geology, a single sedimentary rock unit with a distinct set of physical characteristics or contained fossils, readily distinguishable from those of beds above and below. Well-defined partings called bedding planes separate successive beds or strata.
The depth of a bed can vary from a fraction of a centimetre to several metres, and can extend over any area. The term is also used to indicate the floor beneath a body of water (lake bed), and a layer formed by a fall of particles (ash bed). Beds of Portland and Purbeck limestone are clearly shown at Stair Hole, next to Lulworth Cove, Dorset, England.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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