Marcellus Shale Outcrop in Highland County, Virginia
Detailed Description
A Marcellus Shale outcrop in Highland County, Virginia, shows at the surface the object of shale gas development drilling in nearby states. Assessing undiscovered gas resources, like the USGS 2011 assessment of the Marcellus Shale, uses geologic mapping of outcrops like this in addition to extensive drilling, production, and geophysical data.
Sources/Usage
Public Domain.