BASIN or BASON, a round vessel for holding liquids (the older form bacin is found in many of the Romanic languages, from the Late Lat. baccinus or bacchinus, probably derived from bacca, a bowl). Hence the term has various technical uses, as of a dock constructed with flood-gates in a tidal-river, or of a widen ing in a canal for unloading barges; also, in physical geography, of the drainage area of a river and its tributaries. In geology, a basin is a broad shallow syncline, i.e., it is a structure proper to the bed rock of the district covered by the term ; it must not be confused with the physiographic river basin, although it oc casionally happens that the two coincide to some extent. Some of the better known geological basins in England are, the London basin, a shallow trough or syncline of Tertiary, Cretaceous and Jurassic rocks; the Hampshire basin, of similar formations; and the numerous coal basins, e.g., the South Wales coalfield, the Forest of Dean, North Staffordshire coalfield, etc. The Paris basin is made of strata similar to those in the London and Hampshire basins. Lakes sometimes occupy basins that have been caused by the removal in solution of some of the more soluble con stituents (rock salt, etc.) in the underlying strata; occasionally lake basins have been formed directly by crustal movements.