a. The spread or extension of the sea over land areas, and the consequent evidence of such advance (such as strata deposited unconformably on older rocks, esp. where the new marine deposits are spread far and wide over the former land surface). Also, any change (such as rise of sea level or subsidence of land) that brings offshore, typically deep-water environments to areas formerly occupied by nearshore, typically shallow-water conditions, or that shifts the boundary between marine and nonmarine deposition (or between deposition and erosion) outward from the center of a marine basin. Ant: regression. CF: onlap marine transgression. AGI
b. A term used mostly in Europe for discrepancy in the boundary lines of continuous strata; i.e., unconformity. See also: unconformity AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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