Ronald C. Johnson Michael E. Brownfield Jesse G. Self Tracey J. Mercier 2010 Using a geologic-based assessment methodology, the U.S. Geological Survey estimated an in-place oil shale resource of 1.07 trillion barrels under Federal mineral rights, or 70 percent of the total oil shale in place, in the Piceance Basin, Colorado. More than 67 percent of the total oil shale in-place resource, or 1.027 trillion barrels, is under Federal surface management. application/pdf 10.3133/fs20103041 en U.S. Geological Survey In-Place Oil Shale Resources Underlying Federal Lands in the Piceance Basin, Western Colorado reports