Christopher J. Schenk Jane S. Hearon Thomas M. Finn Sarah E. Gelman Cheryl A. Woodall Tracey J. Mercier Andrea D. Cicero Ronald M. Drake II Geoffrey S. Ellis Michael H. Gardner Benjamin G. Johnson Jenny H. Lagesse Phuong A. Le Heidi M. Leathers-Miller Scott S. Young Kira K. Timm 2025 <p> Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean continuous resources of 703 million barrels of oil and 5.8 trillion cubic feet of gas in the Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado.</p> application/pdf 10.3133/fs20253025 en U.S. Geological Survey Assessment of continuous oil and gas resources in the Upper Cretaceous Niobrara Formation in the Southwestern Wyoming Province, Wyoming and Colorado, 2024 reports