Mudstone
Fine grained sedimentary rock whose original constituents were clays or muds / From Wikipedia, the free encyclopedia
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Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from shale by its lack of fissility (parallel layering).[1][2]
The term mudstone is also used to describe carbonate rocks (limestone or dolomite) that are composed predominantly of carbonate mud.[3] However, in most contexts, the term refers to siliciclastic mudstone, composed mostly of silicate minerals.[2]
The NASA Curiosity rover has found deposits of mudstone on Mars that contain organic substances such as propane, benzene and toluene.[4]