Michael E. Brownfield Marilyn E. Tennyson Phuong A. Le Tracey J. Mercier Thomas M. Finn Sarah J. Hawkins Stephanie B. Gaswirth Kristen R. Marra Timothy R. Klett Heidi M. Leathers-Miller Cheryl A. Woodall Christopher J. Schenk 2017 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated mean undiscovered, technically recoverable continuous resources of 0.45 billion barrels of oil and 1.0 trillion cubic feet of gas in the Middle and Upper Magdalena Basins, Colombia.</p> application/pdf 10.3133/fs20173060 en U.S. Geological Survey Assessment of continuous oil and gas resources in the Middle and Upper Magdalena Basins, Colombia, 2017 reports