Bituminous shale is an argillaceous shale impregnated with bitumen, often accompanying coal. It may contain kerogen; in that case it is classified as oil shale. When carbonaceous material is present in large amounts, bituminous shale grades into bituminous coal. The term 'bituminous shale' sometimes is used in the broader context including also oil shales, albertite and other similar sedimentary rocks.
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