According to high resolution geophysical data inthe 3.5 kHz subbottom profile and single-channel seismic reflection

the Quaternary in the Pearl River mouth shelf can be di-vided into four main sedimentary facies and one special deposit body:fluvial facies

deltaic facies

shallow sea facies

tidal current-bayou facies and sand dune-sand wave deposits.These different sedimentary facies are sedimentary systems that formed in low water level

high water level of different periods and transgressive or regressive conditions con-trolled by regional eustasy during Pleistocene-Holocene.