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・ Stratton Township, Edgar County, Illinois
・ Stratton Upper School
・ Stratton's Independence Mine and Mill
・ Stratton, California
・ Stratton, Colorado
・ Stratton, Cornwall
・ Stratton, Dorset
・ Stratton, Nebraska
・ Stratton, Ohio
・ Stratton, Vermont
・ Stratton, Virginia
・ Stratton, Western Australia
・ Stratton-on-the-Fosse
・ Strattonia
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Stratum
・ Stratum (album)
・ Stratum (disambiguation)
・ Stratum (linguistics)
・ Stratum basale
・ Stratum corneum
・ Stratum corneum chymotryptic enzyme
・ Stratum granulosum
・ Stratum intermedium
・ Stratum lucidum
・ Stratum lucidum (disambiguation)
・ Stratum lucidum of hippocampus
・ Stratum membranosum
・ Stratum Pier
・ Stratum spinosum


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Stratum : ウィキペディア英語版
Stratum

In geology and related fields, 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.
==Characteristics==

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. Each band represents a specific mode of deposition: river silt, beach sand, coal swamp, sand dune, lava bed, etc.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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