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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 | Catalog Last Checked: May 05, 2026 at 08:42 PM | Dataset Last Updated: November 17, 2020 at 12:00 AM
These data represent the extent of the Upper Hell Creek hydrogeologic unit in the Powder River and Williston structural basins.

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