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Shale is characterized by its tendency to split into thin layers less than one centimeter in thickness. This property is called fissility. [1] Shale is the most common sedimentary rock. [2] The term shale is sometimes applied more broadly, as essentially a synonym for mudrock, rather than in the narrower sense of clay-rich fissile mudrock. [3]
Lignite – Soft, brown, combustible, sedimentary rock; Limestone – Type of sedimentary rock; Marl – Lime-rich mud or mudstone which contains variable amounts of clays and silt; Mudstone – Fine grained sedimentary rock whose original constituents were clays or muds; Oil shale – Organic-rich fine-grained sedimentary rock containing kerogen
At this site, soft bodied creatures were preserved, some in whole, by the activity of mud in a sea. Solid skeletons are, generally, the only remnants of ancient life preserved; however, the Burgess Shale includes hard body parts such as bones, skeletons, teeth, and also soft body parts such as muscles, gills, and digestive systems.
Underground soft-rock mining is a group of underground mining techniques used to extract coal, oil shale, potash, and other minerals or geological materials from sedimentary ("soft") rocks. [1] Because deposits in sedimentary rocks are commonly layered and relatively less hard , the mining methods used differ from those used to mine deposits in ...
The dominant lithology within the Bright Angel Shale is greenish shale that is composed largely of illite and varying amounts of chlorite and kaolinite. A reddish brown coloration is imparted to a number of the sandstone and siltstone beds by the high percentage of hematitic ooids and iron oxide cements that they contain.
The Chagrin Shale is a gray [5] or greenish-gray [6] argillaceous shale [5] consisting of gray siltstone, silty gray shale, soft gray clay shale, and (uncommonly) grayish-black shale. [7] The primary minerals in the shale are chlorite, illite, kaolinite, and quartz. [6] Thin to massive beds [8] of siltstone and sandstone are common. [6]
The Conasauga Shale Field is a Cambrian Period part of the Appalachian thrust and fault region of Alabama, Georgia, and Tennessee. The subterranean formation consists of shales and carbonates over 15,000 feet (4,600 m) thick in certain areas.
Cannel coal from the Pennsylvanian of NE Ohio. Cannel coal or candle coal is a type of bituminous coal, [1] also classified as terrestrial type oil shale. [2] [3] [4] Due to its physical morphology and low mineral content cannel coal is considered to be coal but by its texture and composition of the organic matter it is considered to be oil shale. [5]