Definition: Oil shale and oil sands (Code 2410)
Oil shale and oil sands are sedimentary rock which contains organic matter in the form of kerogen.
Kerogen is a waxy hydrocarbon-rich material regarded as a precursor of petroleum. Oil shale may be burned directly or processed by heating to extract shale oil.
Joint International Energy Agency/Eurostat/United Nations Economic Commission For Europe Annual Questionnaire On Solid Fossil Fuels And Manufactured Gases