Flow velocity required for erosion of soft-sediment like mud is somewhat of the same order of magnitude as required to erode gravels because of the cohesiveness of mud. Tajpur beach, extreme south of West Bengal experiences erosion of muddy sediments and the outcome is mud balls, a rounded sedimentary structure, consisting of clay material. Desiccation cracks, bioturbation structures with low energetic waves are the root causes for the formation of mud balls. A detailed analysis shows that dimension of the mud balls has no control over their orientation. A trend in-between the transport distance and shape is found like that mud balls are deformed into rod like shapes as they cover longer distance from the source. Break up of cohesive soft-sediment provides fine sediment into the sand dominating environment, but attention needs in terms of management and protection of this sedimentary environment owing to coastal erosion.

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