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United States Of America
It is estimated that nearly 62% of the world?s potentially recoverable oil shale resources are concentrated in the USA. The largest of the deposits is found in the 42 700 km2 Eocene Green River formation in north-western Colorado, north-eastern Utah and south-western Wyoming. The richest and most easily recoverable deposits are located in the Piceance Creek Basin in western Colorado and the Uinta Basin in eastern Utah. The shale oil can be extracted by surface and in-situ methods of retorting: depending upon the methods of mining and processing used, as much as one-third or more of this resource might be recoverable. There are also the Devonian-Mississippian black shales in the eastern United States.
<font size="2" face="Verdana, Helvetica, sans-serif">Note the key word in the first line of the article (see below) is "economically".
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OIL SHALE
If a technology can be developed to economically recover oil from oil shale, the potential is tantalisingly enormous. If the containing organic material could be converted to oil, the quantities would be far beyond all known conventional oil reserves.
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