Marine regression

Cross-sectional diagrams illustrating the shift of sedimentary facies during transgression (onlap) and regression (offlap)

A marine regression is a geological process occurring when areas of submerged seafloor are exposed during a drop in sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously-exposed land.[1]

  1. ^ Monroe, James Stewart, and Reed Wicander. Physical Geology: Exploring the Earth. Fifth edition; Thomson Brooks/Cole, 2005; p. 162.