Shale, a type of sedimentary rock with complex composition, but with thin sheets or thin layered joints, mainly composed of clay deposits formed by pressure and temperature, but mixed with quartz and feldspar. Debris and other chemicals. Shale is a kind of sedimentary rock with complex composition, but all have thin-sheet or thin-layered joints. It is mainly composed of clay and rock formed by pressure and temperature, but mixed with quartz and feldspar debris. And other chemical substances, according to the composition of the mixed substances, can be divided into: Calcareous shale, iron shale, siliceous shale, carbonaceous shale, black shale, oil shale, etc., among which iron shale may become iron ore, oil shale can refine oil, [1] black shale can be used as The indicated formation of oil. shale The shale is formed in a still water environment. After a long period of sedimentation, the sediment often exists in lakes and river deltas. There are also shale formations in the marine continental shelf. The shale often contains fossils of ancient animals and plants. Sometimes there are fossil footprints of animals, and even traces of ancient raindrops may be preserved in shale.
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