Bituminous

a.
  1. Having the qualities of bitumen; compounded with bitumen; containing bitumen.
    2. Bituminous coal ,
    a kind of coal which yields, when heated, a considerable amount of volatile bituminous matter. It burns with a yellow smoky flame.
    Bituminous limestone ,
    a mineral of a brown or black color, emitting an unpleasant smell when rubbed. That of Dalmatia is so charged with bitumen that it may be cut like soap.
    Bituminous shale ,
    an argillaceous shale impregnated with bitumen, often accompanying coal.