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Siltstone is an unusual rock, in which most of the silt grains are made of quartz. [11] The origin of quartz silt has been a topic of much research and debate. [ 12 ] [ 13 ] Some quartz silt likely has its origin in fine-grained foliated metamorphic rock, [ 14 ] while much marine silt is likely biogenic, [ 15 ] [ 16 ] but most quartz sediments ...
The term is based on the word "whet", which means to sharpen a blade, [3] [4] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
Siltstone – Sedimentary rock which has a grain size in the silt range; Sylvinite – Sedimentary rock made of a mechanical mixture of sylvite and halite; Tillite – Till which has been indurated or lithified by burial; Travertine – Form of limestone deposited by mineral springs
Siltstone at UAT, Estonia. A siltstone is a lithified, non-cleavable mudrock. In order for a rock to be named a siltstone, it must contain over fifty percent silt-sized material. Silt is any particle smaller than sand, 1/16 of a millimeter, and larger than clay, 1/256 of millimeter.
A pelite (from Ancient Greek πηλός (pēlós) 'clay, earth') [3] or metapelite is a metamorphosed fine-grained sedimentary rock, i.e. mudstone or siltstone. The term was earlier used by geologists to describe a clay-rich, fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone, the metamorphosed version of which would ...
It contains numerous rhythmic sequences of mudstone, limestone, siltstone and sandstone of which there are 25 and 38 in the constituent lower and upper formations respectively. A conglomerate occurs at the base of the lower formation.
At its type area north of Ouray, Colorado, the Cutler Formation consists of over 1,000 feet (300 m) of bright red sandstone, siltstone, and conglomerate beds alternating with reddish mudstone or clay-rich limestone. [3] Further west, the unit shows great lithological diversity, and can be divided into easily recognizable mappable subunits.
Red beds (or redbeds) are sedimentary rocks, typically consisting of sandstone, siltstone, and shale, that are predominantly red in color due to the presence of ferric oxides. Frequently, these red-colored sedimentary strata locally contain thin beds of conglomerate, marl, limestone, or some combination of these sedimentary rocks. The ferric ...