In March of 2009, the U.S. Geological Survey (USGS) issued a revised assessment of the in-place oil shale reserves in the Piceance Basin of western Colorado.  Using a geology based assessment methodology, the USGS estimated a total of 1.525 trillion barrels of oil in place, an increase of approximately 50% over the the previous estimate.  The USGS fact sheet is available here: http:\\pubs.usgs.gov/fs/2009/3012/pdf/FS09-3012.pdf