Containing or composed of both calcium compounds and bituminous materials (like tar or oil-derived substances).
From Latin calcareous (chalk-based) + bituminous (from bitumen, relating to tar-like substances), describing mixed geological composition.
Rocks that are calcareobituminous are fossils of ancient swamps and oceans combined—the calcium came from shells and organisms, while the bitumen is from decayed organic matter that didn't fully decompose.
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