Crack pattern in clay exposed to the air Naturally forming mudcracks start as wet, muddy sediment and contracts. A strain is developed because the top layer shrinks while the material below stays the same size. When this strain becomes large enough, channel cracks form in the dried-up surface to relieve the strain. Individual cracks spread and join up, forming a polygonal, interconnected network. These cracks may later be filled with sediment and form over the base. [ ] are broadly similar features that form from underwater shrinkage of muddy sediment caused by differences in salinity or chemical conditions, rather than aerial exposure and desiccation.

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Syneresis cracks can be distinguished from mudcracks because they tend to be discontinuous,, and trilete or spindle-shaped. Morphology and classification [ ]. Fresh mudcracks Mudcracks are generally polygonal when seen from above and v-shaped in cross section. The 'v' opens towards the top of the bed and the crack tapers downward. Allen (1982) proposed a classification scheme for mudcracks based on their completeness, orientation, shape, and type of infill. Completeness [ ] Complete mudcracks form an interconnected network. The connection of cracks often occurs when individual cracks join together forming a larger continuous crack. Bart Davenport Physical World Rare.