Stratum

Stratum is a term used in various fields to refer to a layer or a series of layers of a material. In the context of geology, it refers to a layer of sedimentary rock or soil with internally consistent characteristics that distinguish it from other layers. In biology, it refers to a layer of tissue or cells. In sociology, it refers to a level or class in society.

Geology

In geology, a stratum (plural: strata) is a layer of sedimentary rock or soil with internally consistent characteristics that distinguish it from contiguous layers. Each layer is generally one of a number of parallel layers that lie one upon another, laid down by natural processes. They may extend over hundreds of thousands of square kilometers of the Earth's surface. Strata are typically seen as bands of different colored or differently structured material exposed in cliffs, road cuts, quarries, and river banks. Individual bands may vary in thickness from a few millimeters to a kilometer or more.

Biology

In biology, stratum refers to a layer of tissue or cells. The term is used in both plant anatomy and animal anatomy. In plants, strata refer to layers of cells within the periderm. In animals, strata refer to layers within the skin (epidermis), among other things.

Sociology

In sociology, stratum refers to a level or class in society. The concept of social strata is related to the concept of social class, and is based on the idea that society is divided into hierarchical levels, or strata, based on factors such as wealth, occupation, and education.

See also

• Stratigraphy
• Stratification (disambiguation)
• Social stratification

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