Tracey J. Mercier Cheryl A. Woodall Geoffrey S. Ellis Thomas M. Finn Phuong A. Le Kristen R. Marra 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 83 million barrels of oil and 351 billion cubic feet of gas in lower Paleozoic strata of the Williston Basin Province, North Dakota, Montana, and South Dakota.</p> application/pdf 10.3133/fs20203063 en U.S. Geological Survey Assessment of undiscovered conventional oil and gas resources in the lower Paleozoic of the Williston Basin Province, 2020 reports