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Mudstone
Mudstone, a type of mudrock Mudrocks are a class of fine grained Sedimentary rock#Clastic sedimentary rocks, siliciclastic sedimentary rocks. The varying types of mudrocks include: ''siltstone'', ''claystone'', ''mudstone'', ''slate'', and ''shale''. Most of the particles of ..., is a fine-grained sedimentary rock Sedimentary rocks are types of Rock (geology), rock that are formed by the accumulation or deposition of mineral or organic matter, organic particles at the Earth's surface, followed by Cementation (geology), cementation. Sedimentation is the coll ... whose original constituents were clay Clay is a type of fine-grained natural soil material containing clay minerals. Clays develop plasticity (physics), plasticity when wet, due to a molecular film of water surrounding the clay particles, but become hard, brittle and non–plastic ...s or muds. Mudstone is distinguished from ''shale Shale is a fine-grained, clastic sedimentary rock Sedimentary rocks are types ...
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Mudrock
Mudrocks are a class of fine grained Sedimentary rock#Clastic sedimentary rocks, siliciclastic sedimentary rocks. The varying types of mudrocks include: ''siltstone'', ''claystone'', ''mudstone'', ''slate'', and ''shale''. Most of the particles of which the stone is composed are less than 0.0625 mm (1/16th mm or 0.0025 inches) and are too small to study readily in the field. At first sight the rock types look quite similar; however, there are important differences in composition and nomenclature. There has been a great deal of disagreement involving the classification of mudrocks. There are a few important hurdles to classification, including: #Mudrocks are the least understood, and one of the most understudied sedimentary rocks to date #It is difficult to study mudrock constituents, due to their diminutive size and susceptibility to weathering on outcrops #And most importantly, there is more than one classification scheme accepted by scientists Mudrocks make up fifty per ...
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Dunham Classification
The Dunham classification system for carbonate In chemistry, a carbonate is a salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of Salt (chemistry), salts; salt in its natural form as a crystallinity, crystalline min ... sedimentary rocks was originally devised by Robert J. Dunham in 1962, and subsequently modified by Embry and Klovan in 1971 to include coarse-grained limestone Limestone is a common type of carbonate rock, carbonate sedimentary rock. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science), crystal forms of calcium carbonate (). Limestone form ...s and sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently sediment transport, transported by the action of wind, water, or ice or by the force of gravity acting on the particles. Fo ...s that had been ...
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