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See also:BASIN, or BASON (the older See also:form bacin is found in many of the Romanic See also:languages, from the See also:Late See also:Lat. baccinus or bacchinus, probably derived from bacca, a bowl) , a See also:round See also:vessel for holding liquids . Hence the See also:term has various technical uses, as of a See also:dock constructed with See also:flood-See also:gates in a tidal-See also:river, or of a widening in a See also:canal for unloading See also:barges; also, in See also:physical See also:geography, of the drainage See also:area of a river and its tributaries . In See also:geology, " See also:basin " is See also:equivalent to a broad shallow syncline, i.e. it is a structure proper to the See also:bed See also:rock of the See also:district covered by the term; it must not be confused with the physiographic river basin, although it occasionally happens that the two coincide to some extent . Some of the better known See also:geological basins in See also:England are, the See also:London basin, a shallow trough orsyncline of See also:Tertiary, Cretaceous and See also:Jurassic rocks; the See also:Hampshire basin, of similar formations; and the numerous See also:coal basins, e.g. the S . See also:Wales coalfield, the See also:Forest of See also:Dean, N . See also:Staffordshire coalfield, &c . The See also:Paris basin is made of strata similar to those in the London and Hampshire basins . Strictly speaking, a structural basin is formed of rock beds which exhibit a centroclinal See also:dip; an elongated narrow syncline or trough is not a basin . " Rock-basins " are comparatively small, steep-sided depressions that have been scooped out of the solid rock in mountainous regions, mainly through the agency of glaciers (see See also:CIRQUE) . Lakes sometimes occupy basins that have been caused by the removal in See also:solution of some of the more soluble constituents (rock See also:salt, &c.) in the underlying strata; occasion-ally See also:lake basins have been formed directly by crustal movements . |
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