| − | '''Oil shale''' is a dark-colored [[shale]] containing [[organic]] material that can be crushed and heated to liberate gaseous [[hydrocarbon]]s. | + | '''Oil shale''' is a dark-colored [[shale]] containing [[organic]] material that can be crushed and heated to liberate gaseous [[hydrocarbon]]s. The kerogen in oil shale can be converted to synthetic crude oil through pyrolysis. |