Timothy C. Hester James W. Schmoker Howard L. Sahl U.S. Geological Survey Denver The Woodford shale is one of several organic rich "black" shales of late Devonian and early Mississippian age present in basins of the North American craton. Other examples of similar age include the Antrim shale of the Michigan basin, the new Albany shale of the Illinois basin, the lower and upper members of the Bakken formation of the Williston basin, the Exshaw formation of the Alberta basin, and the "Devonian" shales of the Appalachian basin. Where thermally mature, these black shales are economically important as hydrocarbon source rocks. ...

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