1 black shale. Containing more organic matter and finely dispersed iron sulfide, the organic matter content is 3-10%, and the appearance is similar to that of carbonaceous shale. The difference is that the black shale is not dyed.
2 carbonaceous shale. Contains a large amount of carbonized organic matter, commonly found in the top and bottom of coal-bearing formations.
Carbonaceous shale 3 oil shale. Contains a certain amount of kerogen (>10%), dark brown, light yellowish brown, etc., layered development, burning asphalt.
4 siliceous shale. It contains more chalcedony, opal, etc., and the SiO2 content is above 85%.
5 iron shale. A small amount of iron oxides, hydroxides, and the like. Mostly red or grayish green. It is more common in red and coal-bearing strata.
6 calcareous shale. Contains CaCO3, but does not exceed 25%, otherwise transition marl.
In addition, there is also a mixture of certain sandy components, called sandy shale.
The ability of shale to resist weathering is weak, and in the terrain, low mountains and valleys are often formed by erosion.
The shale is impervious to water and often becomes a water barrier in the distribution of groundwater.
River bank made up of shale
Iron shale
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