After a brief review of the previous studies on distributions and physical environments of Chinese open-coast tidal flats,this paper focuses on analyses of the continuity of tidal flat deposits based on our long time field observations.

Shell sediments on tidal flat near Dongying Harbor of Yellow River Delta;

On the basis of tidal bedding,herringbone cross-bedding,flush cross bedding and plenty of shells,it has been identified that the sedimentary environment of the study area is of tidal flat environment.

The Silurian in this area is tide-controlled coastline sedimentary environment and here mainly developed the tidal flat depositional system.

Vertical changes of grain-size parameters in each tidal-flat sequence were employed to define intertidal subfacies boundaries in this study.

According to the analysis of coring and logging data,this paper believes the tidal-flat and shallow-marine shelf is the main facies of Silurian in Tahe area.

Three types of Triassic carbonate rock, including bank facies, tidal flat facies and karst zone, are widely spread in the Lower Middle Yangtze Region.

Formation and characteristics of the mire on the subtidal sand flat environment;