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A detailed comparison of styles of coal deposition of Tertiary rocks in the Powder River Basin shows that stratigraphic variations, areal distributions, and trends of depositional facies are the results of variations in alluvial settings. Styles of coal deposition are examined in coal-zone intervals, which are treated either as individual or multiple depositional packages. Facies stratigraphic variations display a common interrelationship of channel-levee facies bounded by floodplain and backswamp facies. Anomalously thick, minable coal deposits commonly are split into discrete coal beds separated by complexes of channel-levee facies. The areal distribution of channel deposits and laterally juxtaposed minable coal deposits...

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