Adjustment to NonPeriodicity and Sequence Boundary in Four Divided Model of Sequence Stratigraphy

Key words: 
• sequence stratigraphy /
• remnant maximum flooding surface /
• correlative subaerial unconformity /
• abolishing the previous highstand normal regression /
• RT sequence

Abstract: Based on illustrating chronosequence framework, this article has proved the existence of nonperiodicity of shoreline trajectory within fourdivided model in current sequence stratigraphy, presenting one vertical periodicity corresponding to one and onesixth of lateral periodicities due to the unreasonably assigned highstand normal regression. Authors of this article suggest that the terms of highstand normal regression (HNR) and previous highstand systems tract HST formed during HNR should be abolished or reinterpreted. Depositional sequence has been adjusted as bounded by remnant maximum flooding surfaces (RMFS) and their correlative subaerial unconformities (CSU), and is composed of falling stage, lowstand, transgressive systems tracts upwards, i.e., FSSTLSTTST superposition. At the same time, this paper has united the boundaries between depositional sequence, genetic sequence and RT sequence on the basis of abolishing highstand normal regression and previously assigned highstand systems tract to avoid that genetic sequence and TR sequence span two depositional sequences.