Block of oil shale

Block of oil shale

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Credit: U.S. DEPT. OF ENERGY/SCIENCE PHOTO LIBRARY

Caption: Block of oil shale (marlstone) and a beaker of the crude oil (kerogen) that is derived from it. Oil shale is a fine-grained rock that contains varying amounts of kerogen, an organic material. Heating or retorting (distilling) to 900 degress F. yields a synthetic oil and gas. This specimen is from the Green River formation, a major U.S. deposit spread over the Colorado-Wyoming-Utah area.

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Keywords: crude (kerogen), fossil fuel, geology, kerogen, marlstone, oil, oil shale

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