The maximum flooding surface lying in estuarine - shallow Marine muddy unit demarcates the underlying transgressivesequence and overlying regressive sequence.
位于河口湾—浅海相中的最大海侵面将冰后期海侵沉积旋回分为其下的海侵层序和其上的海退层序。
2
It is considered that F4 layer is a submarine fan generated by gravity flow in marine environment, with a regressive-transgressivesequence from the lower to the upper parts.
Each sequence is composed of incised valley sandstone of low system tract, limestone, marl, coal and mudstone of transgressive system tract and clastics and coal of high system tract.