Christopher J. Schenk Timothy R. Klett Phuong A. Le Heidi M. Leathers Michael E. Brownfield Thomas M. Finn Stephanie B. Gaswirth Kristen R. Marra Marilyn E. Tennyson Ronald M. Drake II 2017 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 884 million barrels of oil and 106 billion cubic feet of gas in the North-Central Montana and Williston Basin Provinces of central Montana and western North Dakota.</p> application/pdf 10.3133/fs20173032 en U.S. Geological Survey Assessment of undiscovered continuous oil and gas resources in the Heath Formation, central Montana and western North Dakota, 2016 reports