This does though
The Green River Formation contains the largest oil shale deposits in the world. It has been estimated that the oil shale reserves could be equal up to 3 trillion barrels (480 billion cubic metres) of shale oil, up to half of which may be recoverable by shale oil extraction technologies (”cooking” kerogen).[11][12][13][14][15] However, the above quoted estimate of ‘recoverable’ oil is in doubt, and challenged, by many renowned geologists because the technology for converting rock into an oil from the Green River shale deposit has not been developed, and it has never been profitably implemented at any significant scale
http://en.wikipedia.org/wiki/Green_River_Formation
By Justin E. Birdwell, Tracey J. Mercier, Ronald C. Johnson, and Michael E. Brownfield,,,(Feb 7th 2013)
Abstract Using a geology-based assessment methodology, the U.S. Geological Survey estimated a total of 4.285 trillion barrels of oil in-place in the oil shale of the three principal basins of the Eocene Green River Formation. Using oil shale cutoffs of potentially viable (15 gallons per ton) and high grade (25 gallons per ton), it is estimated that between 353 billion and 1.146 trillion barrels of the in-place resource have a high potential for development
For additional information contact: Director, Central Energy Resources Science Center U.S. Geological Survey Box 25046, MS-939 Denver Federal Center Denver, CO 80225-0046 http://energy.usgs.gov/