Oil-shale
noun, Geology.
1.
a black or dark-brown shale or siltstone rich in bitumens, from which shale oil is obtained by destructive distillation.
noun
1.
a fine-grained shale containing oil, which can be extracted by heating
oil shale
A fine-grained black or dark brown shale containing hydrocarbons in the form of kerogen. When heated, oil shale yields petroleum or natural gas.
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