The Marcellus Shale holds 262,000 trillion liters of natural gas, enough to power America for centuries. Discover its impact ...

The Marcellus Shale The Marcellus Shale spans almost 95,000 square miles and is found in several states, including West Virginia, New York, and Pennsylvania. Mostly made of black shale, this enormous ...

This photo shows researchers doing field sampling of a pyrite-rich black shale outcrop in China. The weathering of such sediments, which contain sulfur originally buried from the ocean ...

the researchers concluded that the decorated stones were deliberately placed there around 2900 B.C. The vast majority of the stone plaques were made from black shale — a dark, flaky sedimentary ...