Figure 3. Strata1 patterns and chronostratigraphy for the regressive systems tract described in this paper, modified from the concepts of Morton and Suter (1996). Progradation occurs with slow sea level fall and continuous sediment supply. The small hasinward shifts of the shoreline correspond to steps of “forced regression.” Coastal-plain processes are coeval with delta progradation. No unique regional unconformity is formed. Instead, there are numerous local erosion surfaces of different ages, with corresponding correlative conformities. Modified from Edwards (1995h).