Armored mud balls (AMB) on Revadanda Beach, on the west coast of India, are formed in the intertidal zone over a monsoonal seasonal cycle. The AMB are similar in shape to those reported from marine and lacustrine shorelines and the barrier-island environment, but unlike similar areas where the core is derived from erosion of muddy cliffs, at our study site the source of mud is a surficial deposit on the lower beach. Angular and discoidal blocks released from the crack zone, located seaward, are rounded and thinned by rolling about the major axis and are armored by adhesion during the dry season. Evaluation of AMB morphology indicates sedimentological and monsoonal control on their formation and evolution.

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