stratum


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Related to stratum: stratum basale, striatum

stratum

1. any of the distinct layers into which sedimentary rocks are divided
2. Biology a single layer of tissue or cells
3. a layer of ocean or atmosphere either naturally or arbitrarily demarcated

stratum

see SOCIAL STRATUM.

Stratum

 

in geology, the principal form of occurrence of sedimentary rocks, reflecting their sequential deposition. A stratum has more or less homogeneous composition and is confined by two roughly parallel surfaces (the upper is the ceiling and the lower is the sole). The thickness of a stratum, from fractions of a meter to several meters, is much less than the length. Each stratum (with normal, undisturbed bedding) is younger than the one beneath it. Strata may also be composed of metamorphic rocks. Magmatic rocks and ores that are stratiform are called sheet deposits.


Stratum

 

a designation for social levels or classes found in certain non-Marxist conceptions of social stratification.

stratum

[′strad·əm]
(geology)
A mass of homogeneous or gradational sedimentary material, either consolidated rock or unconsolidated soil, occurring in a distinct layer and visually separable from other layers above and below.
(science and technology)
One in a sequence of distinct layers.
(statistics)

stratum

A bed of sedimentary rock or earth.
References in periodicals archive ?
Micah Osborne will continue to head the organisation as the president of Stratum Nutrition, and Chris Haynes will head sales as the director of Global Sales.
In which: H is the distance from the top of natural arch to the coal stratum flooring; [h.
Mike Hughes said: "We are very much looking forward to working in partnership with the Stratum team and are confident that we will work successfully to add value to businesses and reduce bottom line costs.
The greatest decline occurred between 1988 and 1998; during that decade, the middle stratum contracted from 33% of households to 28.
Also included in the article are: a storage stratum made of absorbent fibrous material; an intermediate stratum interposed between the absorbent composite and the storage stratum; and a liquid impervious backsheet.
1) The first stratum, the Material of the work, corresponds to the inorganic stratum in ontological systems.
For State A where the population consists of one stratum, the problem of choosing the appropriate sampling method is straightforward.
In each index area, each item stratum is allocated a minimum number of observations.
Since it could be reasonably supposed that a stratum nearer the surface was younger than one deeper down, the strata offered a method for working out an orderly history of life from the fossils and even coming to some rough conclusions as to how long ago different fossils had existed as living forms.
Since 1998, when Stratum Med first became an Amerinet member, the organization has achieved more than $5 million a year in savings for its members.
The first stratum contains hydrophobic fibers and a binder and the second stratum contains a binder and fibers selected from the group consisting of both hydrophilic and hydrophobic fibers and mixtures, thereof.