Huron shale
From Wikimarcellus
Source: EXCO Resources, Inc
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 Eastern Ohio. It is shallower than the Marcellus shale at the 4000 or 5000 ft. depth. Most of the wells in this formation are horizontal ones.