1 Although nobody told Mr. Callahan until it was too late, the dark-hued shale rocks found in pockets along the Western Slope were oil shale. Often referred to as the rock that burns, oil shale boasts ...

Shale is a sedimentary rock made up of tiny grains of silica, clay and other minerals. Many types of rock have few physical ...

Fracking-the high-pressure injection of water, chemicals and sand into shale deposits to release the gas and oil trapped within the rock-in recent years has been combined with horizontal drilling ...