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Overlying the Harthill Sandstone Formation, the Group comprises around 775 metres thickness of mudstones with some subordinate sandstones. Some burrows and bioturbation are present. The uppermost unit is the early Ordovician Merevale Shale Formation, a mudstone with some dolomitic beds .
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks.
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
It consists of mudstones with lesser sandstones and siltstones displaying rhythmic bedding, typical of turbidite deposits. [2] The overlying Bideford Formation is over 1200m thick in places and consists of interbedded sandstones, mudstones and siltstones with a range of different characters including turbidites, channel sandstones, cross-bedded ...
Lithic sandstones can have a speckled (salt and pepper) or gray color, and are usually associated with one specific type of lithic fragment (i.e., igneous, sedimentary, or metamorphic). [ 1 ] Tectonically, lithic sandstones often form in a wide variety sedimentary depositional environments (including fluvial , deltaic , and alluvial sediments ...
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They are closely related to sandstones in origin, and exhibit many of the same types of sedimentary structures, such as tabular and trough cross-bedding and graded bedding. [ 1 ] [ 2 ] [ 3 ] Fanglomerates are poorly sorted, matrix-rich conglomerates that originated as debris flows on alluvial fans and likely contain the largest accumulations of ...
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