Christopher J. Schenk Tracey J. Mercier Heidi M. Leathers-Miller Marilyn E. Tennyson Thomas M. Finn Cheryl A. Woodall Michael E. Brownfield Phuong A. Le Ronald M. Drake II Kristen R. Marra 2020 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 2.6 trillion cubic feet of gas in the Lewis Shale Total Petroleum System of the San Juan Basin Province, New Mexico and Colorado.</p> application/pdf 10.3133/fs20203048 en U.S. Geological Survey Assessment of undiscovered gas resources in the Lewis Shale Total Petroleum System of the San Juan Basin Province, New Mexico and Colorado, 2020 reports