The tidal flats include dolomitic flat, limemud flat and dolomitic-limemud flat, whereas the open platform mainly consists of grain banks and reefs.

• 其中，潮坪环境包括云坪、灰坪、灰云坪等，而开阔台地环境为各种颗粒滩和生物礁。环境的演化反映了从早到晚海水逐渐加深的过程。