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Alluvium
Alluvium (from the Latin, ''alluvius'', from ''alluere'', "to wash against") is loose, unconsolidated (not cemented together into a solid rock) soil or sediments, which has been eroded, reshaped by water in some form, and redeposited in a non-marine setting.〔(Glossary of Geological Terms ). Geotech.org. Retrieved on 2012-02-12.〕〔(Geology Dictionary – Alluvial, Aquiclude, Arkose ). Geology.Com. Retrieved on 2012-02-12.〕 Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. When this loose alluvial material is deposited or cemented into a lithological unit, or lithified, it is called an alluvial deposit.〔Chisholm, 1911〕
==Definitions==
The term "alluvium" is not typically used in situations where the formation of the sediment can clearly be attributed to another geologic process that is well described. This includes (but is not limited to): lake sediments (lacustrine), river sediments (fluvial), or glacially-derived sediments (glacial till). Sediments that are formed or deposited in a perennial stream or river are typically not referred to as alluvial.〔
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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