bituminous coals

Listing 1 - 3 from 3 for bituminous coals

Appalachian origins revealed through the "coal-rank thermometer"
... coals. Low-vol bituminous coals result when burial depths approach 15,000- 20,000 feet. These coals are valuable as coking coals used in steel-making. High-vol bituminous coals are ... bituminous and lignite coals which are found in other regions of the U.S. Because of their higher fixed carbon content and lower moisture content, bituminous coals contain more energy per pound than sub-bituminous coals ...
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Climate during the Carboniferous Period
... of deposition. There are many areas in the coalfields which contain few minable coals or no coals at all. But for the most part individual seam horizons are remarkably persistent ... is peat. Next comes lignite, then sub-bituminous, bituminous, and in tectonically active regions-- anthracite. Coal beds of the Carboniferous Period are almost all ranked bituminous, or higher, because of their great ...
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Lab III - Preservation (2)
... of coal. Coal geologists recognize a continuum of degree of metamorphism in coal: peat - lignite - bituminous coal (A-C) - anthracite. Peat is an accumulation of virtually unaltered plant material, while ... plants, but can be important in some types of marine settings. Compactions In peat, brown coals (lignite), middens and soft sediments, plant remains may retain their external form with only ...
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