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Stratum

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A stratum (plural: strata) is a layer of sedimentary rock or soil with internally consistent characteristics that distinguish it from other layers. The "stratum" is the fundamental unit in a stratigraphic column and forms the basis of the study of stratigraphy.

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The Grand Canyon, in the western United States, has various different strata that can be seen on a geologic map.

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http://en.wikipedia.org/wiki/Stratum

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