Mudstone
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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.
Mudstone on east beach of Lyme Regis, England
A mudstone: few small components in a micritic matrix, width of picture is 32 mm
Thin section photomicrograph of carbonate mudstone
Fissility (geology)
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In geology, fissility is the ability or tendency of a rock to split along flat planes of weakness. These planes of weakness are oriented parallel to stratification in sedimentary rocks. Fissility is d
Slate displaying fissility