Characteristic of sequence contained two respects: plane symmetry of sequence structure and relative stability of strata distribution, strata onlap and truncation strata superposed development.

• 层序的特征包括两个方面:层序结构的平面对称性和地层分布的相对稳定性;地层超覆和削蚀岩层并存且上下叠置发育。