Accommodation

Aggradation

Aggradational Parasequence Set

Progradational Parasequence Set

Retrogradation

Retrogradational Parasequence Set

Transgression

Lateral outbuilding, or progradation, of strata in a sea-ward direction. Progradation can occur as a result of a sea-level rise accompanied by a high sediment flux (causing a regression). This latter usually occurs during the late stages of the development of a Highstand Systems Tract and/or an Falling Stage Systems Tract.

A Progradational stacking pattern of parasequences refers to the pattern in which facies at the top of each parasequence becomes progressively more proximal (Posamantier, 1999, Wilgus, 1988, Emery, 1986).