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Extent of the Upper Hell Creek hydrogeologic unit in the Powder River and Williston structural basins

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: January 27, 2026 | Last Modified: 2020-11-17T00:00:00Z
These data represent the extent of the Upper Hell Creek hydrogeologic unit in the Powder River and Williston structural basins.

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