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 ...

“Expanded shale is shale rock that has been heated in a kiln, which causes the shale to expand,” Dallas gardening expert Callie Works-Leary says. “The sole purpose of expanded shale is to ...

Shale oil mainly refers to liquid hydrocarbons trapped in formations of shale rock that can be extracted for refining. It is ...