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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 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 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
This group , which consists dominantly of psammite with local developments of quartzite, lies above the Glenfinnan Group in what is interpreted to be a normal stratigraphic contact. The upper boundary of this group is not seen, with Old Red Sandstone typically found unconformably above it. In contrast to the Glennfinnnan Group, there are well ...
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.
psammite (psammitic) arenite (arenaceous) Fine clay(ey) pelite (pelitic) lutite (lutaceous) Barrovian facies series. In the late 1800s and early 1900s, George Barrow ...
The oldest rocks within the area are those of the Tonian age Badenoch Group, [5] which occur along the northwestern edge of the national park. These rocks were formerly referred to as the Central Highland Division or Central Highland Migmatite Complex and have been included both within the Moine and Dalradian successions at various times.
The Wester Ross Supergroup is one of the subdivisions of the Neoproterozoic sequence of sedimentary rocks (or their metamorphic equivalents) in the Scottish Highlands.It lies unconformably on medium to high-grade metamorphic rocks and associated igneous rocks of the Archaean and Paleoproterozoic age Lewisian complex or locally over the Mesoproterozoic sedimentary rocks of the Stoer Group. [1]