Mudstone formation on Lyme Regis East Beach. Lyme Regis (ˌlaɪmˈriːdʒɪs is a coastal town in West Dorset, England, situated 25 Miles west of Dorchester and east of Exeter

Mudstone (also called mudrock) is a fine grained sedimentary rock whose original constituents were clays or muds. Sedimentary rock is one of the three main rock types (the others being igneous and Metamorphic rock) Clay is a naturally occurring material composed primarily of fine-grained Minerals which show plasticity through a variable range of Water content, and In computer gaming, a MUD ( Multi-User Dungeon, Domain or Dimension) is a multi-player computer game that combines elements of Grain size is up to 0. 0625 mm (0. The Millimetre ( American spelling: millimeter, symbol mm) is a unit of Length in the Metric system, equal to 0025 in) with individual grains too small to be distinguished without a microscope. With increased pressure over time the platey clay minerals may become aligned, with the appearance of fissility or parallel layering. Clay minerals are hydrous Aluminium phyllosilicates, sometimes with variable amounts of Iron, Magnesium, Alkali metals Alkaline Fissility refers to the property of Mudstones to split along layers more or less parallel to the plane of bedding thus becoming described as Shales See This finely bedded material that splits readily into thin layers is called shale, as distinct from mudstone. Shale (also called mudstone) is a fine-grained Sedimentary rock whose original constituents were Clay minerals or Muds It is characterized by The lack of fissility or layering in mudstone may be due either to original texture or to the disruption of layering by burrowing organisms in the sediment prior to lithification. Mud rocks, such as mudstone and shale comprise some 65% of all sedimentary rocks. Mudstone looks like hardened clay and, depending upon circumstances under which it was formed, it may show cracks or fissures, like a sun-baked clay deposit. Clay is a naturally occurring material composed primarily of fine-grained Minerals which show plasticity through a variable range of Water content, and They can be separated into 5 categories:

• Siltstone - greater than half of the composition is silt-sized particles. Siltstone is a Sedimentary rock which has a composition intermediate in grain size between the coarser Sandstones and the finer Mudstones and
• Claystone - greater than half of the composition is clay-sized particles. Claystone (ˈkleɪstoʊn is a geological term used to describe a Sedimentary rock that is composed primarily of Clay -sized particles (less than 1/256 Millimetre
• Mudstone - indurated mud; a mix of silt and clay sized particles.
• Shale - exhibits lamination or fissility. Shale (also called mudstone) is a fine-grained Sedimentary rock whose original constituents were Clay minerals or Muds It is characterized by
• Argillite - has undergone low grade metamorphism. "Argillite" may also refer to Argillite Kentucky. An argillite (ˈɑrdʒɨlaɪt is a fine-grained Sedimentary rock composed

References

• Blatt, Harvey, and Robert J. Tracy, 1996, Petrology, W. H. Freeman, 2nd ed. ISBN 0-7167-2438-3