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Mapa De Twinton Strata Coal Company Sudfrica

Mapa De Twinton Strata Coal Company Sudfrica

The two most important deposits are in the Eocene Green River Formation in Colorado Wyoming and Utah and in the Devonian-Mississippian black shales in the eastern United States. Oil shale associated with coal deposits of Pennsylvanian age is also in the eastern United States. Other deposits are known to be in Nevada Montana Alaska Kansas .

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