Blocks of oil shale (marlstone)

Blocks of oil shale (marlstone)

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Caption: Blocks of oil shale (marlstone) from which a form of crude oil (kerogen) is derived, at the Paraho Oil Shale Facility, Anvil Points, Colorado. Oil is extracted from the rock by retorting (distilling) at 900 degrees F. in vertical kilns. One of the major oil shale deposits in the U.S., known as the Green River Formation, it is spread over the Colorado-Wyoming-Utah area. Photograph taken on August 15th, 1979.

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

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