a. The filling of desiccation cracks in mud, customarily in sandstone; generally preserved as raised ridges (casts) arranged in polygonal patterns on the underside of a sandstone bed. Pettijohn, 1
b. An irregular fracture in a crudely polygonal pattern, formed by the shrinkage of clay, silt, or mud, generally in the course of drying. Syn: sun crack; mud cast; shrinkage crack; desiccation crack. AGI
Source: Dictionary of Mining, Mineral, and Related Terms











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