stratum

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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 ?
Some authors, for example, Kauffman & Martin (2008), recommend geological model construction using geological maps that define lateral extents of geological layers.
In view of investigation into engineering geological layers, four geological layers were generalized:
Mitsuhisa Watanabe, a geomorphology professor at Toyo University, said, "I must say Hokuriku Electric is making a far-fetched assessment in saying that geological layers of 130,000 to 120,000 years have not been morphed.
Zonal Adjustment eliminates 'leakage' of volume properties out of geologically defined layers and ensures placement of volume properties into correct geological layers.
To determine the impact of a deep geological layers at social cohesion and the image of a region of implantation, the cantons Committee (CoC) has commissioned a study on the subject ("Cohesion social image and relation to the disposal of radioactive waste "short version" Social Engineering ") as part of the second stage.
The Opportunity team set a goal to examine this mineral in its natural context -- where it is found, how it is situated with respect to other minerals and the area's geological layers -- a valuable method for gathering more information about this ancient environment.
Geological layers comprised not just of bedrock from ancient periods but also sand and pebbles dating back to 130,000 to 120,000 years suggest the fault was deformed, the report said.
The survey on which TEPCO based the conclusion began last April and took longer than expected due to temporary opposition from the local fishing industry to research on geological layers at the bottom of the sea.
Air Liquide will also provide its expertise in the design of the injection skid and assistance in analyzing the results to ensure that the buried CO2 will remain trapped in the deep geological layers.
The mountain has exposed geological layers, including ones identified by Mars orbiters as originating in a wet environment.
Steno's work on geological layers meant that he was also seen as a pioneer of stratigraphy, the study of strata or layers.

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