pyrobitumen

[pahy-roh-bi-too-muhn, -tyoo-, -bich-oo-]
noun
any of the dark, solid hydrocarbons including peat, coal, and bituminous shale.

Origin:
1900–05; pyro- + bitumen

pyrobituminous, pyrobituminoid, adjective
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Kerogen is a pyrobitumen, and oil is formed from kerogen by heating.
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