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Ingeology and related fields, astratum (pl.:strata) is a layer ofrock orsediment characterized by certainlithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as eitherbedding surfaces orbedding planes.[1] Prior to the publication of the International Stratigraphic Guide,[1] older publications have defined a stratum as being either equivalent to a singlebed or composed of a number of beds; as a layer greater than 1 cm in thickness and constituting a part of a bed; or a general term that includes bothbed andlamina.[2] Related terms aresubstrate andsubstratum (pl.substrata), a stratum underlying another stratum.
Typically, a stratum is generally one of a number of parallel layers that lie one upon another to form enormousthicknesses of strata.[1] The bedding surfaces (bedding planes) that separate strata represent episodic breaks in deposition associated either with periodicerosion, cessation of deposition, or some combination of the two.[3][4] Stacked together with other strata, individual stratum can form compositestratigraphic units that can extend over hundreds of thousands of square kilometers of theEarth's surface. Individual strata can cover similarly large areas. Strata are typically seen as bands of different colored or differently structured material exposed incliffs, road cuts,quarries, andriver banks. Individual bands may vary in thickness from a few millimeters to several meters or more. A band may represent a specific mode ofdeposition: riversilt, beachsand, coalswamp,sand dune,lava bed, and others.
In the study of rock and sediment strata, geologists have recognized a number of different types of strata, includingbed,flow,band, andkey bed.[1][5] A bed is a single stratum that is lithologically distinguishable from other layers above and below it. In the classification hierarchy of sedimentary lithostratigraphic units, a bed is the smallest formal unit. However, only beds that are distinctive enough to be useful for stratigraphic correlation andgeological mapping are customarily given formal names and considered formal lithostratigraphic units. The volcanic equivalent of a bed, a flow, is a discrete extrusive volcanic stratum or body distinguishable by texture, composition, or other objective criteria. As in case of a bed, a flow should only be designated and named as a formal lithostratigraphic unit when it is distinctive, widespread, and useful for stratigraphic correlation. A band is a thin stratum that is distinguishable by a distinctive lithology or color and is useful in correlating strata. Finally, a key bed, also called amarker bed, is a well-defined, easily identifiable stratum or body of strata that has sufficiently distinctive characteristics, such as lithology or fossil content, to be recognized and correlated during geologic field or subsurface mapping.[1][5]
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