Schematic cross section across one idealized third-order depositional sequence for siliciclastic strata (“sea slug diagram”). Diagram (A) illustrates the distribution of sediment and systems tracts in depth and space. Diagram (B) shows the distribution in time (vertical axis) and space. Blank areas on diagram (B) record the lack of deposition and/or the erosion that would occur in different areas at a specific time interval. Colored areas record deposition of strata in different areas at a specific time interval. Pgc = prograding complex; Bf = basin floor fan; fl = fan lobe; fc = fan channel, sf = slope fan, tbsf = top basin floor fan surface; tsfs = top slope fan surface; lsw = lowstand wedge; TS = transgressive surface; ivf = incised valley; SB1 = Type 1 sequence boundary; SB2 = Type 2 sequence boundary; TST = transgressive systems tract; mfs = maximum flooding surface; HST = highstand systems tract; smst = shelf margin systems tract; pgc = prograding complex. After Vail (1987).
Reprinted with permission of AAPG, whose permission is required for further use.
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