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Oil shale in the Green River formation of Eocene age underlies an area of about 1,400 square miles in that part of the Piceance Creek basin in Rio Blanco and Garfield Counties, Colo., that lies between the Colorado River to the south and the White River to the north. Preliminary estimates of tonnage and oil content of the oil shale include indicated and inferred potential reserves which may be combined as follows: (1) part of the richest oil-shale zone (the Mahogany zone) yielding an average of 45 gallons of oil per ton and ranging from 5 to 31 feet in thickness contains a total of more than 7 billion tons of shale and 7.5 billion barrels of oil, (2) shale zones yielding an average of 30 gallons of oil per ton and ranging from 15 to 180 feet in thickness contain about 137.5 billion tons of shale and about 98.8 billion barrels of oil, (3) shale zones yielding an average of 25 gallons of oil per ton and ranging from 15 to 780 feet in thickness contain about 325 billion tons of shale and about 194 billion barrels of oil, (4) shale zones yielding an average of 15 gallons of oil per ton and ranging from 15 to 2,200 feet in thickness contain about 2,686 billion' tons of oil shale, with an oil content of 959 billion barrels. The estimates reflect the total size and oil content of the deposits, and no allowance is made for losses that would be incurred in mining and processing of the oil shale.

Preliminary report on oil-shale resources of Piceance Creek basin, northwestern Colorado