thalassic

Adjective

Meaning

Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.

Source: Webster's dictionary

marine oceanic littoral water sea hydrographic naval maritime aquatic nautical seafaring seagoing deep-sea pelagic saltwater

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deposits of sediment in gulfs and seas rather than in the ocean proper are known as thalassic deposits Source: Internet