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- noun Plural form of
Sorry, no etymologies found.
Oil Shale contains bituminous solids called kerogens that are released as petroleum-like liquids when the rock is heated to sufficient temperatures (somewhere around 600 to 700 F).
Permian kerogens from Autun, Fr., and Carboniferous and Permian torbanite from Scotland, Australia, and South Africa appear to consist almost exclusively of Botryococcus colonies, as does Recent post-Pleistocene coorongite from
Some oil shale kerogens are composed almost entirely of algal remains, whereas others are a mixture of amorphous organic matter with a variable content of identifiable organic remnants.
Much more of the ancient organic carbon is sequestered in kerogens, which are transformed remains of buried biomass found mostly in calcareous and oil shales.