Huron shale

From Wikimarcellus

The Huron shale (aka Lower Huron) is a play spanning a four state area in Central and Southern West Virginia, Eastern Kentucky, Western Virginia and Southeastern Ohio. The Huron shale is also sometimes referred to as the Devonian shale formation. It is shallower than the Marcellus shale at the 4000 or 5000 ft. depth. Most of the wells in this formation currently are horizontal ones.

Wells in the Lower Huron generally use horizontal air drilling and are fraced with Nitrogen.