The Two Major Coal Fields of The United States.
Coal Fields of the U.S.
Western Coal
Primarily subbituminous coal with a small amount of bituminous coal. Montana and North Dakota have huge lignite deposits. All deposits were formed during the late Cretaceous, Paleocene and Eocene time periods.
Eastern Coal
Primarily bituminous coal with a minor amount of anthricite. Higher in sulfer and ash than Rocky Mountain coal. Deposited during the Pennsylvanian time period.
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