stratum
n.
horizontal layer of material; bed of sedimentary rock (Geology); level of society
Stratum
This article is about the geologic use of the term, for other uses see
Stratum (disambiguation) For other uses, see
strata (novel) and
strata title.In
geology and related fields, a stratum (plural: strata) is a layer of
rock or
soil with internally consistent characteristics that distinguishes it from contiguous layers. Each layer is generally one of a number of parallel layers that lie one upon another, laid down by natural forces. 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. Each band represents a specific mode of
deposition -- river
silt, beach
sand, coal
swamp,
sand dune,
lava bed, etc.
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Stratum (der)
n.
(Geology) stratum, layer of material, bed of sedimentary rock (such as rock, earth, etc.)
stratum (m)
n.
stratum, horizontal layer of material; bed of sedimentary rock (Geology); level of society
Stratum
(n.)
A bed or layer artificially made; a course.
(n.)
A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
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