Tracey J. Mercier Cheryl A. Woodall Thomas M. Finn Phuong A. Le Kristen R. Marra Geoffrey S. Ellis Heidi M. Leathers-Miller Ronald M. Drake II Christopher J. Schenk 2021 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 161 million barrels of oil and 93 billion cubic feet of gas in the Tyler Formation of the Williston Basin Province, North Dakota.</p> application/pdf 10.3133/fs20203067 en U.S. Geological Survey Assessment of undiscovered oil and gas resources in the Pennsylvanian Tyler Formation of the Williston Basin Province, 2020 reports