This category of sediment migh be composed by fine mud, sandy mud or muddy sand (Emodnet, n.d.).
According to Wentworth's classification (1922), fine mud has grain sizes from 0.0078 mm to 0.0156mm.
The difference between sandy mud and muddy sand is the content in mud, sand and gravel. With sandy mud containing between 50- 90%, 10 - 50% sand, and less than 5% gravel; and muddy sand containing 10-50% mud, 50-90% sand, and less than 5% gravel (Emodnet, n.d.).
Source:
Emodnet, European Marine Observation and Data Network (n.d.). "EMODnet Folk substrate classification". Retrieved from https://www.emodnet-geology.eu, on 2022-02-15.
Wentworth C. (1922). "Grain Size Classification." The Journal of Geology: "A Scale of Grade and Class Terms for Clastic Sediments". Retrieved from https://www.planetary.org/space-images/wentworth-1922-grain-size on 2022-02-15.
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