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Psammite (Greek: psammitēs "(made) from sand", from psammos "sand") [1] is a general term for sandstone. It is equivalent to the Latin-derived term arenite [ 2 ] [ 3 ] and is commonly used in various publications to describe a metamorphosed sedimentary rock with a dominantly sandstone protolith . [ 4 ]
The Sand Reckoner (Greek: Ψαμμίτης, Psammites) is a work by Archimedes, an Ancient Greek mathematician of the 3rd century BC, in which he set out to determine an upper bound for the number of grains of sand that fit into the universe.
The Altnaharra Psammite is interpreted to have been deposited as a prograding braid plain, with fluvial deposition being replaced by shoreline deposits that were tidally influenced, before a deeper marine environment developed during the deposition of the Vaich Pelite Formation. This is interpreted to be a single progradation-retrogradation cycle.
The equivalent Greek-derived term is psammite, though this is more commonly used for metamorphosed sediments. Since it refers to grain size rather than chemical composition, the term is used for example in the classification of clastic carbonatic limestones, as the granulometrically equivalent term sandstone is not appropriate for limestone.
psammite (psammitic) arenite (arenaceous) Fine clay(ey) pelite (pelitic) lutite (lutaceous) Barrovian facies series. In the late 1800s and early 1900s, George Barrow ...
The boulder is made up of siltstone, claystone, and medium-grained and medium-to-conglomeratic psammite (a type of sandstone) intercalated with siltstone. [5]
psammite A general term for a sandstone, most often used to describe a metamorphosed rock unit with a dominantly sandstone protolith. pseudomatrix A weaker material (mainly lithic fragments) that becomes crushed and matrix-like in a rock. pumice A light-coloured, highly vesicular volcanic rock of very low density. pyroclastic flow
In geology, metasedimentary rock is a type of metamorphic rock.Such a rock was first formed through the deposition and solidification of sediment.Then, the rock was buried underneath subsequent rock and was subjected to high pressures and temperatures, causing the rock to recrystallize.