TrekGEO > Geology of Japan > Sedimentary facies > Estuary

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Ocean - River boundary


A sedimentary system composed of a series of sedimentary facies in estuary at the river mouths. Estuary is a variety of bays which is at the tide-dominated river mouths. Estuary is a shape of bays intruded into the land and is usually formed in the transgressive process, whereas delta is a shape of land protruded into the sea and is usually formed in the regressive process. Sediments deposit on the seafloor of the bay. It is considered as a system during the transitional stage from the low sea level to high sea level, and during the high sea level stage for large rivers.

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