Wikipedia:
Bituminous rocks
Bituminous rocks are sedimentary rocks, usually shale, sandstone, limestone or dolostone/dolomite, that contain traces of tar, bitumen, asphalt, petroleum or carbon. For example anthraconite is a bituminous form of limestone, calcite or marble. Also can be known as "carbonaceous rocks". See sedimentary organic matter.
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
