A fossil-fuel source that may either be an immature petroleum deposit or a petroleum deposit that has lost its lighter hydrocarbons is

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Tar sand is a fossil-fuel source that may either be an immature petroleum deposit or a petroleum deposit that has lost its lighter hydrocarbons, making it a mixture of sand, water, clay, and a thick, molasses-like substance called bitumen. Peat is an early form of coal, and lignite is a low-grade coal that occurs in sedimentary rocks. Oil shale is a sedimentary rock that contains solid organic matter called kerogen, which can be used to produce oil through heating.

A Fossil-Fuel Source That May Either Be an Immature Petroleum