forearcbasseinid
Forearcbasseinid is a term used in some geological discussions to designate an informal lithostratigraphic unit within forearc basins—sedimentary basins that develop between a subduction trench and an overlying volcanic arc. The name combines forearc, basin, and the suffix -id, indicating a depositional package rather than a named formation. It is not a formal stratigraphic rank in the IUGS scheme, but is sometimes used to describe a characteristic facies association found in forearc basins.
Geological context and composition: Forearcbasseinid deposits form in convergent-margin settings under rapid subsidence and variable sediment
Interpretation and use: The identification of a forearcbasseinid facies can aid in reconstructing subsidence rates, volcanic
See also: Forearc basin, Turbidite, Accretionary wedge, Subduction zone.